[xboard.git] / backend.c

/*
 * backend.c -- Common back end for X and Windows NT versions of
 *
 * Copyright 1991 by Digital Equipment Corporation, Maynard,
 * Massachusetts.
 *
 * Enhancements Copyright 1992-2001, 2002, 2003, 2004, 2005, 2006,
 * 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
 *
 * Enhancements Copyright 2005 Alessandro Scotti
 *
 * The following terms apply to Digital Equipment Corporation's copyright
 * interest in XBoard:
 * ------------------------------------------------------------------------
 * All Rights Reserved
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted,
 * provided that the above copyright notice appear in all copies and that
 * both that copyright notice and this permission notice appear in
 * supporting documentation, and that the name of Digital not be
 * used in advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.
 *
 * DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
 * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
 * DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
 * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 * ------------------------------------------------------------------------
 *
 * The following terms apply to the enhanced version of XBoard
 * distributed by the Free Software Foundation:
 * ------------------------------------------------------------------------
 *
 * GNU XBoard is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 *
 * GNU XBoard is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see http://www.gnu.org/licenses/.  *
 *
 *------------------------------------------------------------------------
 ** See the file ChangeLog for a revision history.  */

/* [AS] Also useful here for debugging */
#ifdef WIN32
#include <windows.h>

int flock(int f, int code);
#define LOCK_EX 2
#define SLASH '\\'

#else

#include <sys/file.h>
#define SLASH '/'

#endif

#include "config.h"

#include <assert.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <math.h>
#include <ctype.h>

#if STDC_HEADERS
# include <stdlib.h>
# include <string.h>
# include <stdarg.h>
#else /* not STDC_HEADERS */
# if HAVE_STRING_H
#  include <string.h>
# else /* not HAVE_STRING_H */
#  include <strings.h>
# endif /* not HAVE_STRING_H */
#endif /* not STDC_HEADERS */

#if HAVE_SYS_FCNTL_H
# include <sys/fcntl.h>
#else /* not HAVE_SYS_FCNTL_H */
# if HAVE_FCNTL_H
#  include <fcntl.h>
# endif /* HAVE_FCNTL_H */
#endif /* not HAVE_SYS_FCNTL_H */

#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif

#if defined(_amigados) && !defined(__GNUC__)
struct timezone {
    int tz_minuteswest;
    int tz_dsttime;
};
extern int gettimeofday(struct timeval *, struct timezone *);
#endif

#if HAVE_UNISTD_H
# include <unistd.h>
#endif

#include "common.h"
#include "frontend.h"
#include "backend.h"
#include "parser.h"
#include "moves.h"
#if ZIPPY
# include "zippy.h"
#endif
#include "backendz.h"
#include "gettext.h"

#ifdef ENABLE_NLS
# define _(s) gettext (s)
# define N_(s) gettext_noop (s)
# define T_(s) gettext(s)
#else
# ifdef WIN32
#   define _(s) T_(s)
#   define N_(s) s
# else
#   define _(s) (s)
#   define N_(s) s
#   define T_(s) s
# endif
#endif


int establish P((void));
void read_from_player P((InputSourceRef isr, VOIDSTAR closure,
                         char *buf, int count, int error));
void read_from_ics P((InputSourceRef isr, VOIDSTAR closure,
                      char *buf, int count, int error));
void ics_printf P((char *format, ...));
void SendToICS P((char *s));
void SendToICSDelayed P((char *s, long msdelay));
void SendMoveToICS P((ChessMove moveType, int fromX, int fromY, int toX, int toY, char promoChar));
void HandleMachineMove P((char *message, ChessProgramState *cps));
int AutoPlayOneMove P((void));
int LoadGameOneMove P((ChessMove readAhead));
int LoadGameFromFile P((char *filename, int n, char *title, int useList));
int LoadPositionFromFile P((char *filename, int n, char *title));
int SavePositionToFile P((char *filename));
void MakeMove P((int fromX, int fromY, int toX, int toY, int promoChar));
void ShowMove P((int fromX, int fromY, int toX, int toY));
int FinishMove P((ChessMove moveType, int fromX, int fromY, int toX, int toY,
                   /*char*/int promoChar));
void BackwardInner P((int target));
void ForwardInner P((int target));
int Adjudicate P((ChessProgramState *cps));
void GameEnds P((ChessMove result, char *resultDetails, int whosays));
void EditPositionDone P((Boolean fakeRights));
void PrintOpponents P((FILE *fp));
void PrintPosition P((FILE *fp, int move));
void StartChessProgram P((ChessProgramState *cps));
void SendToProgram P((char *message, ChessProgramState *cps));
void SendMoveToProgram P((int moveNum, ChessProgramState *cps));
void ReceiveFromProgram P((InputSourceRef isr, VOIDSTAR closure,
                           char *buf, int count, int error));
void SendTimeControl P((ChessProgramState *cps,
                        int mps, long tc, int inc, int sd, int st));
char *TimeControlTagValue P((void));
void Attention P((ChessProgramState *cps));
void FeedMovesToProgram P((ChessProgramState *cps, int upto));
int ResurrectChessProgram P((void));
void DisplayComment P((int moveNumber, char *text));
void DisplayMove P((int moveNumber));

void ParseGameHistory P((char *game));
void ParseBoard12 P((char *string));
void KeepAlive P((void));
void StartClocks P((void));
void SwitchClocks P((int nr));
void StopClocks P((void));
void ResetClocks P((void));
char *PGNDate P((void));
void SetGameInfo P((void));
int RegisterMove P((void));
void MakeRegisteredMove P((void));
void TruncateGame P((void));
int looking_at P((char *, int *, char *));
void CopyPlayerNameIntoFileName P((char **, char *));
char *SavePart P((char *));
int SaveGameOldStyle P((FILE *));
int SaveGamePGN P((FILE *));
int CheckFlags P((void));
long NextTickLength P((long));
void CheckTimeControl P((void));
void show_bytes P((FILE *, char *, int));
int string_to_rating P((char *str));
void ParseFeatures P((char* args, ChessProgramState *cps));
void InitBackEnd3 P((void));
void FeatureDone P((ChessProgramState* cps, int val));
void InitChessProgram P((ChessProgramState *cps, int setup));
void OutputKibitz(int window, char *text);
int PerpetualChase(int first, int last);
int EngineOutputIsUp();
void InitDrawingSizes(int x, int y);
void NextMatchGame P((void));
int NextTourneyGame P((int nr, int *swap));
int Pairing P((int nr, int nPlayers, int *w, int *b, int *sync));
FILE *WriteTourneyFile P((char *results, FILE *f));
void DisplayTwoMachinesTitle P(());

#ifdef WIN32
       extern void ConsoleCreate();
#endif

ChessProgramState *WhitePlayer();
void InsertIntoMemo P((int which, char *text)); // [HGM] kibitz: in engineo.c
int VerifyDisplayMode P(());

char *GetInfoFromComment( int, char * ); // [HGM] PV time: returns stripped comment
void InitEngineUCI( const char * iniDir, ChessProgramState * cps ); // [HGM] moved here from winboard.c
char *ProbeBook P((int moveNr, char *book)); // [HGM] book: returns a book move
char *SendMoveToBookUser P((int nr, ChessProgramState *cps, int initial)); // [HGM] book
void ics_update_width P((int new_width));
extern char installDir[MSG_SIZ];
VariantClass startVariant; /* [HGM] nicks: initial variant */
Boolean abortMatch;

extern int tinyLayout, smallLayout;
ChessProgramStats programStats;
char lastPV[2][2*MSG_SIZ]; /* [HGM] pv: last PV in thinking output of each engine */
int endPV = -1;
static int exiting = 0; /* [HGM] moved to top */
static int setboardSpoiledMachineBlack = 0 /*, errorExitFlag = 0*/;
int startedFromPositionFile = FALSE; Board filePosition;       /* [HGM] loadPos */
Board partnerBoard;     /* [HGM] bughouse: for peeking at partner game          */
int partnerHighlight[2];
Boolean partnerBoardValid = 0;
char partnerStatus[MSG_SIZ];
Boolean partnerUp;
Boolean originalFlip;
Boolean twoBoards = 0;
char endingGame = 0;    /* [HGM] crash: flag to prevent recursion of GameEnds() */
int whiteNPS, blackNPS; /* [HGM] nps: for easily making clocks aware of NPS     */
VariantClass currentlyInitializedVariant; /* [HGM] variantswitch */
int lastIndex = 0;      /* [HGM] autoinc: last game/position used in match mode */
Boolean connectionAlive;/* [HGM] alive: ICS connection status from probing      */
int opponentKibitzes;
int lastSavedGame; /* [HGM] save: ID of game */
char chatPartner[MAX_CHAT][MSG_SIZ]; /* [HGM] chat: list of chatting partners */
extern int chatCount;
int chattingPartner;
char marker[BOARD_RANKS][BOARD_FILES]; /* [HGM] marks for target squares */
char lastMsg[MSG_SIZ];
ChessSquare pieceSweep = EmptySquare;
ChessSquare promoSweep = EmptySquare, defaultPromoChoice;
int promoDefaultAltered;

/* States for ics_getting_history */
#define H_FALSE 0
#define H_REQUESTED 1
#define H_GOT_REQ_HEADER 2
#define H_GOT_UNREQ_HEADER 3
#define H_GETTING_MOVES 4
#define H_GOT_UNWANTED_HEADER 5

/* whosays values for GameEnds */
#define GE_ICS 0
#define GE_ENGINE 1
#define GE_PLAYER 2
#define GE_FILE 3
#define GE_XBOARD 4
#define GE_ENGINE1 5
#define GE_ENGINE2 6

/* Maximum number of games in a cmail message */
#define CMAIL_MAX_GAMES 20

/* Different types of move when calling RegisterMove */
#define CMAIL_MOVE   0
#define CMAIL_RESIGN 1
#define CMAIL_DRAW   2
#define CMAIL_ACCEPT 3

/* Different types of result to remember for each game */
#define CMAIL_NOT_RESULT 0
#define CMAIL_OLD_RESULT 1
#define CMAIL_NEW_RESULT 2

/* Telnet protocol constants */
#define TN_WILL 0373
#define TN_WONT 0374
#define TN_DO   0375
#define TN_DONT 0376
#define TN_IAC  0377
#define TN_ECHO 0001
#define TN_SGA  0003
#define TN_PORT 23

char*
safeStrCpy (char *dst, const char *src, size_t count)
{ // [HGM] made safe
  int i;
  assert( dst != NULL );
  assert( src != NULL );
  assert( count > 0 );

  for(i=0; i<count; i++) if((dst[i] = src[i]) == NULLCHAR) break;
  if(  i == count && dst[count-1] != NULLCHAR)
    {
      dst[ count-1 ] = '\0'; // make sure incomplete copy still null-terminated
      if(appData.debugMode)
      fprintf(debugFP, "safeStrCpy: copying %s into %s didn't work, not enough space %d\n",src,dst, (int)count);
    }

  return dst;
}

/* Some compiler can't cast u64 to double
 * This function do the job for us:

 * We use the highest bit for cast, this only
 * works if the highest bit is not
 * in use (This should not happen)
 *
 * We used this for all compiler
 */
double
u64ToDouble (u64 value)
{
  double r;
  u64 tmp = value & u64Const(0x7fffffffffffffff);
  r = (double)(s64)tmp;
  if (value & u64Const(0x8000000000000000))
       r +=  9.2233720368547758080e18; /* 2^63 */
 return r;
}

/* Fake up flags for now, as we aren't keeping track of castling
   availability yet. [HGM] Change of logic: the flag now only
   indicates the type of castlings allowed by the rule of the game.
   The actual rights themselves are maintained in the array
   castlingRights, as part of the game history, and are not probed
   by this function.
 */
int
PosFlags (index)
{
  int flags = F_ALL_CASTLE_OK;
  if ((index % 2) == 0) flags |= F_WHITE_ON_MOVE;
  switch (gameInfo.variant) {
  case VariantSuicide:
    flags &= ~F_ALL_CASTLE_OK;
  case VariantGiveaway:         // [HGM] moved this case label one down: seems Giveaway does have castling on ICC!
    flags |= F_IGNORE_CHECK;
  case VariantLosers:
    flags |= F_MANDATORY_CAPTURE; //[HGM] losers: sets flag so TestLegality rejects non-capts if capts exist
    break;
  case VariantAtomic:
    flags |= F_IGNORE_CHECK | F_ATOMIC_CAPTURE;
    break;
  case VariantKriegspiel:
    flags |= F_KRIEGSPIEL_CAPTURE;
    break;
  case VariantCapaRandom:
  case VariantFischeRandom:
    flags |= F_FRC_TYPE_CASTLING; /* [HGM] enable this through flag */
  case VariantNoCastle:
  case VariantShatranj:
  case VariantCourier:
  case VariantMakruk:
  case VariantGrand:
    flags &= ~F_ALL_CASTLE_OK;
    break;
  default:
    break;
  }
  return flags;
}

FILE *gameFileFP, *debugFP;
char *currentDebugFile; // [HGM] debug split: to remember name

/*
    [AS] Note: sometimes, the sscanf() function is used to parse the input
    into a fixed-size buffer. Because of this, we must be prepared to
    receive strings as long as the size of the input buffer, which is currently
    set to 4K for Windows and 8K for the rest.
    So, we must either allocate sufficiently large buffers here, or
    reduce the size of the input buffer in the input reading part.
*/

char cmailMove[CMAIL_MAX_GAMES][MOVE_LEN], cmailMsg[MSG_SIZ];
char bookOutput[MSG_SIZ*10], thinkOutput[MSG_SIZ*10], lastHint[MSG_SIZ];
char thinkOutput1[MSG_SIZ*10];

ChessProgramState first, second, pairing;

/* premove variables */
int premoveToX = 0;
int premoveToY = 0;
int premoveFromX = 0;
int premoveFromY = 0;
int premovePromoChar = 0;
int gotPremove = 0;
Boolean alarmSounded;
/* end premove variables */

char *ics_prefix = "$";
int ics_type = ICS_GENERIC;

int currentMove = 0, forwardMostMove = 0, backwardMostMove = 0;
int pauseExamForwardMostMove = 0;
int nCmailGames = 0, nCmailResults = 0, nCmailMovesRegistered = 0;
int cmailMoveRegistered[CMAIL_MAX_GAMES], cmailResult[CMAIL_MAX_GAMES];
int cmailMsgLoaded = FALSE, cmailMailedMove = FALSE;
int cmailOldMove = -1, firstMove = TRUE, flipView = FALSE;
int blackPlaysFirst = FALSE, startedFromSetupPosition = FALSE;
int searchTime = 0, pausing = FALSE, pauseExamInvalid = FALSE;
int whiteFlag = FALSE, blackFlag = FALSE;
int userOfferedDraw = FALSE;
int ics_user_moved = 0, ics_gamenum = -1, ics_getting_history = H_FALSE;
int matchMode = FALSE, hintRequested = FALSE, bookRequested = FALSE;
int cmailMoveType[CMAIL_MAX_GAMES];
long ics_clock_paused = 0;
ProcRef icsPR = NoProc, cmailPR = NoProc;
InputSourceRef telnetISR = NULL, fromUserISR = NULL, cmailISR = NULL;
GameMode gameMode = BeginningOfGame;
char moveList[MAX_MOVES][MOVE_LEN], parseList[MAX_MOVES][MOVE_LEN * 2];
char *commentList[MAX_MOVES], *cmailCommentList[CMAIL_MAX_GAMES];
ChessProgramStats_Move pvInfoList[MAX_MOVES]; /* [AS] Info about engine thinking */
int hiddenThinkOutputState = 0; /* [AS] */
int adjudicateLossThreshold = 0; /* [AS] Automatic adjudication */
int adjudicateLossPlies = 6;
char white_holding[64], black_holding[64];
TimeMark lastNodeCountTime;
long lastNodeCount=0;
int shiftKey; // [HGM] set by mouse handler

int have_sent_ICS_logon = 0;
int movesPerSession;
int suddenDeath, whiteStartMove, blackStartMove; /* [HGM] for implementation of 'any per time' sessions, as in first part of byoyomi TC */
long whiteTimeRemaining, blackTimeRemaining, timeControl, timeIncrement, lastWhite, lastBlack;
Boolean adjustedClock;
long timeControl_2; /* [AS] Allow separate time controls */
char *fullTimeControlString = NULL, *nextSession, *whiteTC, *blackTC; /* [HGM] secondary TC: merge of MPS, TC and inc */
long timeRemaining[2][MAX_MOVES];
int matchGame = 0, nextGame = 0, roundNr = 0;
Boolean waitingForGame = FALSE;
TimeMark programStartTime, pauseStart;
char ics_handle[MSG_SIZ];
int have_set_title = 0;

/* animateTraining preserves the state of appData.animate
 * when Training mode is activated. This allows the
 * response to be animated when appData.animate == TRUE and
 * appData.animateDragging == TRUE.
 */
Boolean animateTraining;

GameInfo gameInfo;

AppData appData;

Board boards[MAX_MOVES];
/* [HGM] Following 7 needed for accurate legality tests: */
signed char  castlingRank[BOARD_FILES]; // and corresponding ranks
signed char  initialRights[BOARD_FILES];
int   nrCastlingRights; // For TwoKings, or to implement castling-unknown status
int   initialRulePlies, FENrulePlies;
FILE  *serverMoves = NULL; // next two for broadcasting (/serverMoves option)
int loadFlag = 0;
Boolean shuffleOpenings;
int mute; // mute all sounds

// [HGM] vari: next 12 to save and restore variations
#define MAX_VARIATIONS 10
int framePtr = MAX_MOVES-1; // points to free stack entry
int storedGames = 0;
int savedFirst[MAX_VARIATIONS];
int savedLast[MAX_VARIATIONS];
int savedFramePtr[MAX_VARIATIONS];
char *savedDetails[MAX_VARIATIONS];
ChessMove savedResult[MAX_VARIATIONS];

void PushTail P((int firstMove, int lastMove));
Boolean PopTail P((Boolean annotate));
void PushInner P((int firstMove, int lastMove));
void PopInner P((Boolean annotate));
void CleanupTail P((void));

ChessSquare  FIDEArray[2][BOARD_FILES] = {
    { WhiteRook, WhiteKnight, WhiteBishop, WhiteQueen,
        WhiteKing, WhiteBishop, WhiteKnight, WhiteRook },
    { BlackRook, BlackKnight, BlackBishop, BlackQueen,
        BlackKing, BlackBishop, BlackKnight, BlackRook }
};

ChessSquare twoKingsArray[2][BOARD_FILES] = {
    { WhiteRook, WhiteKnight, WhiteBishop, WhiteQueen,
        WhiteKing, WhiteKing, WhiteKnight, WhiteRook },
    { BlackRook, BlackKnight, BlackBishop, BlackQueen,
        BlackKing, BlackKing, BlackKnight, BlackRook }
};

ChessSquare  KnightmateArray[2][BOARD_FILES] = {
    { WhiteRook, WhiteMan, WhiteBishop, WhiteQueen,
        WhiteUnicorn, WhiteBishop, WhiteMan, WhiteRook },
    { BlackRook, BlackMan, BlackBishop, BlackQueen,
        BlackUnicorn, BlackBishop, BlackMan, BlackRook }
};

ChessSquare SpartanArray[2][BOARD_FILES] = {
    { WhiteRook, WhiteKnight, WhiteBishop, WhiteQueen,
        WhiteKing, WhiteBishop, WhiteKnight, WhiteRook },
    { BlackAlfil, BlackMarshall, BlackKing, BlackDragon,
        BlackDragon, BlackKing, BlackAngel, BlackAlfil }
};

ChessSquare fairyArray[2][BOARD_FILES] = { /* [HGM] Queen side differs from King side */
    { WhiteRook, WhiteKnight, WhiteBishop, WhiteQueen,
        WhiteKing, WhiteBishop, WhiteKnight, WhiteRook },
    { BlackCardinal, BlackAlfil, BlackMarshall, BlackAngel,
        BlackKing, BlackMarshall, BlackAlfil, BlackCardinal }
};

ChessSquare ShatranjArray[2][BOARD_FILES] = { /* [HGM] (movGen knows about Shatranj Q and P) */
    { WhiteRook, WhiteKnight, WhiteAlfil, WhiteKing,
        WhiteFerz, WhiteAlfil, WhiteKnight, WhiteRook },
    { BlackRook, BlackKnight, BlackAlfil, BlackKing,
        BlackFerz, BlackAlfil, BlackKnight, BlackRook }
};

ChessSquare makrukArray[2][BOARD_FILES] = { /* [HGM] (movGen knows about Shatranj Q and P) */
    { WhiteRook, WhiteKnight, WhiteMan, WhiteKing,
        WhiteFerz, WhiteMan, WhiteKnight, WhiteRook },
    { BlackRook, BlackKnight, BlackMan, BlackFerz,
        BlackKing, BlackMan, BlackKnight, BlackRook }
};


#if (BOARD_FILES>=10)
ChessSquare ShogiArray[2][BOARD_FILES] = {
    { WhiteQueen, WhiteKnight, WhiteFerz, WhiteWazir,
        WhiteKing, WhiteWazir, WhiteFerz, WhiteKnight, WhiteQueen },
    { BlackQueen, BlackKnight, BlackFerz, BlackWazir,
        BlackKing, BlackWazir, BlackFerz, BlackKnight, BlackQueen }
};

ChessSquare XiangqiArray[2][BOARD_FILES] = {
    { WhiteRook, WhiteKnight, WhiteAlfil, WhiteFerz,
        WhiteWazir, WhiteFerz, WhiteAlfil, WhiteKnight, WhiteRook },
    { BlackRook, BlackKnight, BlackAlfil, BlackFerz,
        BlackWazir, BlackFerz, BlackAlfil, BlackKnight, BlackRook }
};

ChessSquare CapablancaArray[2][BOARD_FILES] = {
    { WhiteRook, WhiteKnight, WhiteAngel, WhiteBishop, WhiteQueen,
        WhiteKing, WhiteBishop, WhiteMarshall, WhiteKnight, WhiteRook },
    { BlackRook, BlackKnight, BlackAngel, BlackBishop, BlackQueen,
        BlackKing, BlackBishop, BlackMarshall, BlackKnight, BlackRook }
};

ChessSquare GreatArray[2][BOARD_FILES] = {
    { WhiteDragon, WhiteKnight, WhiteAlfil, WhiteGrasshopper, WhiteKing,
        WhiteSilver, WhiteCardinal, WhiteAlfil, WhiteKnight, WhiteDragon },
    { BlackDragon, BlackKnight, BlackAlfil, BlackGrasshopper, BlackKing,
        BlackSilver, BlackCardinal, BlackAlfil, BlackKnight, BlackDragon },
};

ChessSquare JanusArray[2][BOARD_FILES] = {
    { WhiteRook, WhiteAngel, WhiteKnight, WhiteBishop, WhiteKing,
        WhiteQueen, WhiteBishop, WhiteKnight, WhiteAngel, WhiteRook },
    { BlackRook, BlackAngel, BlackKnight, BlackBishop, BlackKing,
        BlackQueen, BlackBishop, BlackKnight, BlackAngel, BlackRook }
};

ChessSquare GrandArray[2][BOARD_FILES] = {
    { EmptySquare, WhiteKnight, WhiteBishop, WhiteQueen, WhiteKing,
        WhiteMarshall, WhiteAngel, WhiteBishop, WhiteKnight, EmptySquare },
    { EmptySquare, BlackKnight, BlackBishop, BlackQueen, BlackKing,
        BlackMarshall, BlackAngel, BlackBishop, BlackKnight, EmptySquare }
};

#ifdef GOTHIC
ChessSquare GothicArray[2][BOARD_FILES] = {
    { WhiteRook, WhiteKnight, WhiteBishop, WhiteQueen, WhiteMarshall,
        WhiteKing, WhiteAngel, WhiteBishop, WhiteKnight, WhiteRook },
    { BlackRook, BlackKnight, BlackBishop, BlackQueen, BlackMarshall,
        BlackKing, BlackAngel, BlackBishop, BlackKnight, BlackRook }
};
#else // !GOTHIC
#define GothicArray CapablancaArray
#endif // !GOTHIC

#ifdef FALCON
ChessSquare FalconArray[2][BOARD_FILES] = {
    { WhiteRook, WhiteKnight, WhiteBishop, WhiteFalcon, WhiteQueen,
        WhiteKing, WhiteFalcon, WhiteBishop, WhiteKnight, WhiteRook },
    { BlackRook, BlackKnight, BlackBishop, BlackFalcon, BlackQueen,
        BlackKing, BlackFalcon, BlackBishop, BlackKnight, BlackRook }
};
#else // !FALCON
#define FalconArray CapablancaArray
#endif // !FALCON

#else // !(BOARD_FILES>=10)
#define XiangqiPosition FIDEArray
#define CapablancaArray FIDEArray
#define GothicArray FIDEArray
#define GreatArray FIDEArray
#endif // !(BOARD_FILES>=10)

#if (BOARD_FILES>=12)
ChessSquare CourierArray[2][BOARD_FILES] = {
    { WhiteRook, WhiteKnight, WhiteAlfil, WhiteBishop, WhiteMan, WhiteKing,
        WhiteFerz, WhiteWazir, WhiteBishop, WhiteAlfil, WhiteKnight, WhiteRook },
    { BlackRook, BlackKnight, BlackAlfil, BlackBishop, BlackMan, BlackKing,
        BlackFerz, BlackWazir, BlackBishop, BlackAlfil, BlackKnight, BlackRook }
};
#else // !(BOARD_FILES>=12)
#define CourierArray CapablancaArray
#endif // !(BOARD_FILES>=12)


Board initialPosition;


/* Convert str to a rating. Checks for special cases of "----",

   "++++", etc. Also strips ()'s */
int
string_to_rating (char *str)
{
  while(*str && !isdigit(*str)) ++str;
  if (!*str)
    return 0;   /* One of the special "no rating" cases */
  else
    return atoi(str);
}

void
ClearProgramStats ()
{
    /* Init programStats */
    programStats.movelist[0] = 0;
    programStats.depth = 0;
    programStats.nr_moves = 0;
    programStats.moves_left = 0;
    programStats.nodes = 0;
    programStats.time = -1;        // [HGM] PGNtime: make invalid to recognize engine output
    programStats.score = 0;
    programStats.got_only_move = 0;
    programStats.got_fail = 0;
    programStats.line_is_book = 0;
}

void
CommonEngineInit ()
{   // [HGM] moved some code here from InitBackend1 that has to be done after both engines have contributed their settings
    if (appData.firstPlaysBlack) {
        first.twoMachinesColor = "black\n";
        second.twoMachinesColor = "white\n";
    } else {
        first.twoMachinesColor = "white\n";
        second.twoMachinesColor = "black\n";
    }

    first.other = &second;
    second.other = &first;

    { float norm = 1;
        if(appData.timeOddsMode) {
            norm = appData.timeOdds[0];
            if(norm > appData.timeOdds[1]) norm = appData.timeOdds[1];
        }
        first.timeOdds  = appData.timeOdds[0]/norm;
        second.timeOdds = appData.timeOdds[1]/norm;
    }

    if(programVersion) free(programVersion);
    if (appData.noChessProgram) {
        programVersion = (char*) malloc(5 + strlen(PACKAGE_STRING));
        sprintf(programVersion, "%s", PACKAGE_STRING);
    } else {
      /* [HGM] tidy: use tidy name, in stead of full pathname (which was probably a bug due to / vs \ ) */
      programVersion = (char*) malloc(8 + strlen(PACKAGE_STRING) + strlen(first.tidy));
      sprintf(programVersion, "%s + %s", PACKAGE_STRING, first.tidy);
    }
}

void
UnloadEngine (ChessProgramState *cps)
{
        /* Kill off first chess program */
        if (cps->isr != NULL)
          RemoveInputSource(cps->isr);
        cps->isr = NULL;

        if (cps->pr != NoProc) {
            ExitAnalyzeMode();
            DoSleep( appData.delayBeforeQuit );
            SendToProgram("quit\n", cps);
            DoSleep( appData.delayAfterQuit );
            DestroyChildProcess(cps->pr, cps->useSigterm);
        }
        cps->pr = NoProc;
        if(appData.debugMode) fprintf(debugFP, "Unload %s\n", cps->which);
}

void
ClearOptions (ChessProgramState *cps)
{
    int i;
    cps->nrOptions = cps->comboCnt = 0;
    for(i=0; i<MAX_OPTIONS; i++) {
        cps->option[i].min = cps->option[i].max = cps->option[i].value = 0;
        cps->option[i].textValue = 0;
    }
}

char *engineNames[] = {
  /* TRANSLATORS: "first" is the first of possible two chess engines. It is inserted into strings
     such as "%s engine" / "%s chess program" / "%s machine" - all meaning the same thing */
N_("first"),
  /* TRANSLATORS: "second" is the second of possible two chess engines. It is inserted into strings
     such as "%s engine" / "%s chess program" / "%s machine" - all meaning the same thing */
N_("second")
};

void
InitEngine (ChessProgramState *cps, int n)
{   // [HGM] all engine initialiation put in a function that does one engine

    ClearOptions(cps);

    cps->which = _(engineNames[n]);
    cps->maybeThinking = FALSE;
    cps->pr = NoProc;
    cps->isr = NULL;
    cps->sendTime = 2;
    cps->sendDrawOffers = 1;

    cps->program = appData.chessProgram[n];
    cps->host = appData.host[n];
    cps->dir = appData.directory[n];
    cps->initString = appData.engInitString[n];
    cps->computerString = appData.computerString[n];
    cps->useSigint  = TRUE;
    cps->useSigterm = TRUE;
    cps->reuse = appData.reuse[n];
    cps->nps = appData.NPS[n];   // [HGM] nps: copy nodes per second
    cps->useSetboard = FALSE;
    cps->useSAN = FALSE;
    cps->usePing = FALSE;
    cps->lastPing = 0;
    cps->lastPong = 0;
    cps->usePlayother = FALSE;
    cps->useColors = TRUE;
    cps->useUsermove = FALSE;
    cps->sendICS = FALSE;
    cps->sendName = appData.icsActive;
    cps->sdKludge = FALSE;
    cps->stKludge = FALSE;
    TidyProgramName(cps->program, cps->host, cps->tidy);
    cps->matchWins = 0;
    safeStrCpy(cps->variants, appData.variant, MSG_SIZ);
    cps->analysisSupport = 2; /* detect */
    cps->analyzing = FALSE;
    cps->initDone = FALSE;

    /* New features added by Tord: */
    cps->useFEN960 = FALSE;
    cps->useOOCastle = TRUE;
    /* End of new features added by Tord. */
    cps->fenOverride  = appData.fenOverride[n];

    /* [HGM] time odds: set factor for each machine */
    cps->timeOdds  = appData.timeOdds[n];

    /* [HGM] secondary TC: how to handle sessions that do not fit in 'level'*/
    cps->accumulateTC = appData.accumulateTC[n];
    cps->maxNrOfSessions = 1;

    /* [HGM] debug */
    cps->debug = FALSE;

    cps->supportsNPS = UNKNOWN;
    cps->memSize = FALSE;
    cps->maxCores = FALSE;
    cps->egtFormats[0] = NULLCHAR;

    /* [HGM] options */
    cps->optionSettings  = appData.engOptions[n];

    cps->scoreIsAbsolute = appData.scoreIsAbsolute[n]; /* [AS] */
    cps->isUCI = appData.isUCI[n]; /* [AS] */
    cps->hasOwnBookUCI = appData.hasOwnBookUCI[n]; /* [AS] */

    if (appData.protocolVersion[n] > PROTOVER
        || appData.protocolVersion[n] < 1)
      {
        char buf[MSG_SIZ];
        int len;

        len = snprintf(buf, MSG_SIZ, _("protocol version %d not supported"),
                       appData.protocolVersion[n]);
        if( (len >= MSG_SIZ) && appData.debugMode )
          fprintf(debugFP, "InitBackEnd1: buffer truncated.\n");

        DisplayFatalError(buf, 0, 2);
      }
    else
      {
        cps->protocolVersion = appData.protocolVersion[n];
      }

    InitEngineUCI( installDir, cps );  // [HGM] moved here from winboard.c, to make available in xboard
    ParseFeatures(appData.featureDefaults, cps);
}

ChessProgramState *savCps;

void
LoadEngine ()
{
    int i;
    if(WaitForEngine(savCps, LoadEngine)) return;
    CommonEngineInit(); // recalculate time odds
    if(gameInfo.variant != StringToVariant(appData.variant)) {
        // we changed variant when loading the engine; this forces us to reset
        Reset(TRUE, savCps != &first);
        EditGameEvent(); // for consistency with other path, as Reset changes mode
    }
    InitChessProgram(savCps, FALSE);
    SendToProgram("force\n", savCps);
    DisplayMessage("", "");
    if (startedFromSetupPosition) SendBoard(savCps, backwardMostMove);
    for (i = backwardMostMove; i < forwardMostMove; i++) SendMoveToProgram(i, savCps);
    ThawUI();
    SetGNUMode();
}

void
ReplaceEngine (ChessProgramState *cps, int n)
{
    EditGameEvent();
    UnloadEngine(cps);
    appData.noChessProgram = FALSE;
    appData.clockMode = TRUE;
    InitEngine(cps, n);
    UpdateLogos(TRUE);
    if(n) return; // only startup first engine immediately; second can wait
    savCps = cps; // parameter to LoadEngine passed as globals, to allow scheduled calling :-(
    LoadEngine();
}

extern char *engineName, *engineDir, *engineChoice, *engineLine, *nickName, *params;
extern Boolean isUCI, hasBook, storeVariant, v1, addToList, useNick;

static char resetOptions[] = 
        "-reuse -firstIsUCI false -firstHasOwnBookUCI true -firstTimeOdds 1 "
        "-firstInitString \"" INIT_STRING "\" -firstComputerString \"" COMPUTER_STRING "\" "
        "-firstOptions \"\" -firstNPS -1 -fn \"\"";

void
FloatToFront(char **list, char *engineLine)
{
    char buf[MSG_SIZ], tidy[MSG_SIZ], *p = buf, *q, *r = buf;
    int i=0;
    if(appData.recentEngines <= 0) return;
    TidyProgramName(engineLine, "localhost", tidy+1);
    tidy[0] = buf[0] = '\n'; strcat(tidy, "\n");
    strncpy(buf+1, *list, MSG_SIZ-50);
    if(p = strstr(buf, tidy)) { // tidy name appears in list
        q = strchr(++p, '\n'); if(q == NULL) return; // malformed, don't touch
        while(*p++ = *++q); // squeeze out
    }
    strcat(tidy, buf+1); // put list behind tidy name
    p = tidy + 1; while(q = strchr(p, '\n')) i++, r = p, p = q + 1; // count entries in new list
    if(i > appData.recentEngines) *r = NULLCHAR; // if maximum rached, strip off last
    ASSIGN(*list, tidy+1);
}

void
Load (ChessProgramState *cps, int i)
{
    char *p, *q, buf[MSG_SIZ], command[MSG_SIZ], buf2[MSG_SIZ];
    if(engineLine && engineLine[0]) { // an engine was selected from the combo box
        snprintf(buf, MSG_SIZ, "-fcp %s", engineLine);
        SwapEngines(i); // kludge to parse -f* / -first* like it is -s* / -second*
        ParseArgsFromString(resetOptions); appData.fenOverride[0] = NULL; appData.pvSAN[0] = FALSE;
        appData.firstProtocolVersion = PROTOVER;
        ParseArgsFromString(buf);
        SwapEngines(i);
        ReplaceEngine(cps, i);
        FloatToFront(&appData.recentEngineList, engineLine);
        return;
    }
    p = engineName;
    while(q = strchr(p, SLASH)) p = q+1;
    if(*p== NULLCHAR) { DisplayError(_("You did not specify the engine executable"), 0); return; }
    if(engineDir[0] != NULLCHAR)
        appData.directory[i] = engineDir;
    else if(p != engineName) { // derive directory from engine path, when not given
        p[-1] = 0;
        appData.directory[i] = strdup(engineName);
        p[-1] = SLASH;
    } else appData.directory[i] = ".";
    if(params[0]) {
        if(strchr(p, ' ') && !strchr(p, '"')) snprintf(buf2, MSG_SIZ, "\"%s\"", p), p = buf2; // quote if it contains spaces
        snprintf(command, MSG_SIZ, "%s %s", p, params);
        p = command;
    }
    appData.chessProgram[i] = strdup(p);
    appData.isUCI[i] = isUCI;
    appData.protocolVersion[i] = v1 ? 1 : PROTOVER;
    appData.hasOwnBookUCI[i] = hasBook;
    if(!nickName[0]) useNick = FALSE;
    if(useNick) ASSIGN(appData.pgnName[i], nickName);
    if(addToList) {
        int len;
        char quote;
        q = firstChessProgramNames;
        if(nickName[0]) snprintf(buf, MSG_SIZ, "\"%s\" -fcp ", nickName); else buf[0] = NULLCHAR;
        quote = strchr(p, '"') ? '\'' : '"'; // use single quotes around engine command if it contains double quotes
        snprintf(buf+strlen(buf), MSG_SIZ-strlen(buf), "%c%s%c -fd \"%s\"%s%s%s%s%s%s%s%s\n",
                        quote, p, quote, appData.directory[i], 
                        useNick ? " -fn \"" : "",
                        useNick ? nickName : "",
                        useNick ? "\"" : "",
                        v1 ? " -firstProtocolVersion 1" : "",
                        hasBook ? "" : " -fNoOwnBookUCI",
                        isUCI ? (isUCI == TRUE ? " -fUCI" : gameInfo.variant == VariantShogi ? " -fUSI" : " -fUCCI") : "",
                        storeVariant ? " -variant " : "",
                        storeVariant ? VariantName(gameInfo.variant) : "");
        firstChessProgramNames = malloc(len = strlen(q) + strlen(buf) + 1);
        snprintf(firstChessProgramNames, len, "%s%s", q, buf);
        if(q)   free(q);
        FloatToFront(&appData.recentEngineList, buf);
    }
    ReplaceEngine(cps, i);
}

void
InitTimeControls ()
{
    int matched, min, sec;
    /*
     * Parse timeControl resource
     */
    if (!ParseTimeControl(appData.timeControl, appData.timeIncrement,
                          appData.movesPerSession)) {
        char buf[MSG_SIZ];
        snprintf(buf, sizeof(buf), _("bad timeControl option %s"), appData.timeControl);
        DisplayFatalError(buf, 0, 2);
    }

    /*
     * Parse searchTime resource
     */
    if (*appData.searchTime != NULLCHAR) {
        matched = sscanf(appData.searchTime, "%d:%d", &min, &sec);
        if (matched == 1) {
            searchTime = min * 60;
        } else if (matched == 2) {
            searchTime = min * 60 + sec;
        } else {
            char buf[MSG_SIZ];
            snprintf(buf, sizeof(buf), _("bad searchTime option %s"), appData.searchTime);
            DisplayFatalError(buf, 0, 2);
        }
    }
}

void
InitBackEnd1 ()
{

    ShowThinkingEvent(); // [HGM] thinking: make sure post/nopost state is set according to options
    startVariant = StringToVariant(appData.variant); // [HGM] nicks: remember original variant

    GetTimeMark(&programStartTime);
    srandom((programStartTime.ms + 1000*programStartTime.sec)*0x1001001); // [HGM] book: makes sure random is unpredictabe to msec level
    appData.seedBase = random() + (random()<<15);
    pauseStart = programStartTime; pauseStart.sec -= 100; // [HGM] matchpause: fake a pause that has long since ended

    ClearProgramStats();
    programStats.ok_to_send = 1;
    programStats.seen_stat = 0;

    /*
     * Initialize game list
     */
    ListNew(&gameList);


    /*
     * Internet chess server status
     */
    if (appData.icsActive) {
        appData.matchMode = FALSE;
        appData.matchGames = 0;
#if ZIPPY
        appData.noChessProgram = !appData.zippyPlay;
#else
        appData.zippyPlay = FALSE;
        appData.zippyTalk = FALSE;
        appData.noChessProgram = TRUE;
#endif
        if (*appData.icsHelper != NULLCHAR) {
            appData.useTelnet = TRUE;
            appData.telnetProgram = appData.icsHelper;
        }
    } else {
        appData.zippyTalk = appData.zippyPlay = FALSE;
    }

    /* [AS] Initialize pv info list [HGM] and game state */
    {
        int i, j;

        for( i=0; i<=framePtr; i++ ) {
            pvInfoList[i].depth = -1;
            boards[i][EP_STATUS] = EP_NONE;
            for( j=0; j<BOARD_FILES-2; j++ ) boards[i][CASTLING][j] = NoRights;
        }
    }

    InitTimeControls();

    /* [AS] Adjudication threshold */
    adjudicateLossThreshold = appData.adjudicateLossThreshold;

    InitEngine(&first, 0);
    InitEngine(&second, 1);
    CommonEngineInit();

    pairing.which = "pairing"; // pairing engine
    pairing.pr = NoProc;
    pairing.isr = NULL;
    pairing.program = appData.pairingEngine;
    pairing.host = "localhost";
    pairing.dir = ".";

    if (appData.icsActive) {
        appData.clockMode = TRUE;  /* changes dynamically in ICS mode */
    } else if (appData.noChessProgram) { // [HGM] st: searchTime mode now also is clockMode
        appData.clockMode = FALSE;
        first.sendTime = second.sendTime = 0;
    }

#if ZIPPY
    /* Override some settings from environment variables, for backward
       compatibility.  Unfortunately it's not feasible to have the env
       vars just set defaults, at least in xboard.  Ugh.
    */
    if (appData.icsActive && (appData.zippyPlay || appData.zippyTalk)) {
      ZippyInit();
    }
#endif

    if (!appData.icsActive) {
      char buf[MSG_SIZ];
      int len;

      /* Check for variants that are supported only in ICS mode,
         or not at all.  Some that are accepted here nevertheless
         have bugs; see comments below.
      */
      VariantClass variant = StringToVariant(appData.variant);
      switch (variant) {
      case VariantBughouse:     /* need four players and two boards */
      case VariantKriegspiel:   /* need to hide pieces and move details */
        /* case VariantFischeRandom: (Fabien: moved below) */
        len = snprintf(buf,MSG_SIZ, _("Variant %s supported only in ICS mode"), appData.variant);
        if( (len >= MSG_SIZ) && appData.debugMode )
          fprintf(debugFP, "InitBackEnd1: buffer truncated.\n");

        DisplayFatalError(buf, 0, 2);
        return;

      case VariantUnknown:
      case VariantLoadable:
      case Variant29:
      case Variant30:
      case Variant31:
      case Variant32:
      case Variant33:
      case Variant34:
      case Variant35:
      case Variant36:
      default:
        len = snprintf(buf, MSG_SIZ, _("Unknown variant name %s"), appData.variant);
        if( (len >= MSG_SIZ) && appData.debugMode )
          fprintf(debugFP, "InitBackEnd1: buffer truncated.\n");

        DisplayFatalError(buf, 0, 2);
        return;

      case VariantXiangqi:    /* [HGM] repetition rules not implemented */
      case VariantFairy:      /* [HGM] TestLegality definitely off! */
      case VariantGothic:     /* [HGM] should work */
      case VariantCapablanca: /* [HGM] should work */
      case VariantCourier:    /* [HGM] initial forced moves not implemented */
      case VariantShogi:      /* [HGM] could still mate with pawn drop */
      case VariantKnightmate: /* [HGM] should work */
      case VariantCylinder:   /* [HGM] untested */
      case VariantFalcon:     /* [HGM] untested */
      case VariantCrazyhouse: /* holdings not shown, ([HGM] fixed that!)
                                 offboard interposition not understood */
      case VariantNormal:     /* definitely works! */
      case VariantWildCastle: /* pieces not automatically shuffled */
      case VariantNoCastle:   /* pieces not automatically shuffled */
      case VariantFischeRandom: /* [HGM] works and shuffles pieces */
      case VariantLosers:     /* should work except for win condition,
                                 and doesn't know captures are mandatory */
      case VariantSuicide:    /* should work except for win condition,
                                 and doesn't know captures are mandatory */
      case VariantGiveaway:   /* should work except for win condition,
                                 and doesn't know captures are mandatory */
      case VariantTwoKings:   /* should work */
      case VariantAtomic:     /* should work except for win condition */
      case Variant3Check:     /* should work except for win condition */
      case VariantShatranj:   /* should work except for all win conditions */
      case VariantMakruk:     /* should work except for draw countdown */
      case VariantBerolina:   /* might work if TestLegality is off */
      case VariantCapaRandom: /* should work */
      case VariantJanus:      /* should work */
      case VariantSuper:      /* experimental */
      case VariantGreat:      /* experimental, requires legality testing to be off */
      case VariantSChess:     /* S-Chess, should work */
      case VariantGrand:      /* should work */
      case VariantSpartan:    /* should work */
        break;
      }
    }

}

int
NextIntegerFromString (char ** str, long * value)
{
    int result = -1;
    char * s = *str;

    while( *s == ' ' || *s == '\t' ) {
        s++;
    }

    *value = 0;

    if( *s >= '0' && *s <= '9' ) {
        while( *s >= '0' && *s <= '9' ) {
            *value = *value * 10 + (*s - '0');
            s++;
        }

        result = 0;
    }

    *str = s;

    return result;
}

int
NextTimeControlFromString (char ** str, long * value)
{
    long temp;
    int result = NextIntegerFromString( str, &temp );

    if( result == 0 ) {
        *value = temp * 60; /* Minutes */
        if( **str == ':' ) {
            (*str)++;
            result = NextIntegerFromString( str, &temp );
            *value += temp; /* Seconds */
        }
    }

    return result;
}

int
NextSessionFromString (char ** str, int *moves, long * tc, long *inc, int *incType)
{   /* [HGM] routine added to read '+moves/time' for secondary time control. */
    int result = -1, type = 0; long temp, temp2;

    if(**str != ':') return -1; // old params remain in force!
    (*str)++;
    if(**str == '*') type = *(*str)++, temp = 0; // sandclock TC
    if( NextIntegerFromString( str, &temp ) ) return -1;
    if(type) { *moves = 0; *tc = temp * 500; *inc = temp * 1000; *incType = '*'; return 0; }

    if(**str != '/') {
        /* time only: incremental or sudden-death time control */
        if(**str == '+') { /* increment follows; read it */
            (*str)++;
            if(**str == '!') type = *(*str)++; // Bronstein TC
            if(result = NextIntegerFromString( str, &temp2)) return -1;
            *inc = temp2 * 1000;
            if(**str == '.') { // read fraction of increment
                char *start = ++(*str);
                if(result = NextIntegerFromString( str, &temp2)) return -1;
                temp2 *= 1000;
                while(start++ < *str) temp2 /= 10;
                *inc += temp2;
            }
        } else *inc = 0;
        *moves = 0; *tc = temp * 1000; *incType = type;
        return 0;
    }

    (*str)++; /* classical time control */
    result = NextIntegerFromString( str, &temp2); // NOTE: already converted to seconds by ParseTimeControl()

    if(result == 0) {
        *moves = temp;
        *tc    = temp2 * 1000;
        *inc   = 0;
        *incType = type;
    }
    return result;
}

int
GetTimeQuota (int movenr, int lastUsed, char *tcString)
{   /* [HGM] get time to add from the multi-session time-control string */
    int incType, moves=1; /* kludge to force reading of first session */
    long time, increment;
    char *s = tcString;

    if(!*s) return 0; // empty TC string means we ran out of the last sudden-death version
    do {
        if(moves) NextSessionFromString(&s, &moves, &time, &increment, &incType);
        nextSession = s; suddenDeath = moves == 0 && increment == 0;
        if(movenr == -1) return time;    /* last move before new session     */
        if(incType == '*') increment = 0; else // for sandclock, time is added while not thinking
        if(incType == '!' && lastUsed < increment) increment = lastUsed;
        if(!moves) return increment;     /* current session is incremental   */
        if(movenr >= 0) movenr -= moves; /* we already finished this session */
    } while(movenr >= -1);               /* try again for next session       */

    return 0; // no new time quota on this move
}

int
ParseTimeControl (char *tc, float ti, int mps)
{
  long tc1;
  long tc2;
  char buf[MSG_SIZ], buf2[MSG_SIZ], *mytc = tc;
  int min, sec=0;

  if(ti >= 0 && !strchr(tc, '+') && !strchr(tc, '/') ) mps = 0;
  if(!strchr(tc, '+') && !strchr(tc, '/') && sscanf(tc, "%d:%d", &min, &sec) >= 1)
      sprintf(mytc=buf2, "%d", 60*min+sec); // convert 'classical' min:sec tc string to seconds
  if(ti > 0) {

    if(mps)
      snprintf(buf, MSG_SIZ, ":%d/%s+%g", mps, mytc, ti);
    else 
      snprintf(buf, MSG_SIZ, ":%s+%g", mytc, ti);
  } else {
    if(mps)
      snprintf(buf, MSG_SIZ, ":%d/%s", mps, mytc);
    else 
      snprintf(buf, MSG_SIZ, ":%s", mytc);
  }
  fullTimeControlString = StrSave(buf); // this should now be in PGN format
  
  if( NextTimeControlFromString( &tc, &tc1 ) != 0 ) {
    return FALSE;
  }

  if( *tc == '/' ) {
    /* Parse second time control */
    tc++;

    if( NextTimeControlFromString( &tc, &tc2 ) != 0 ) {
      return FALSE;
    }

    if( tc2 == 0 ) {
      return FALSE;
    }

    timeControl_2 = tc2 * 1000;
  }
  else {
    timeControl_2 = 0;
  }

  if( tc1 == 0 ) {
    return FALSE;
  }

  timeControl = tc1 * 1000;

  if (ti >= 0) {
    timeIncrement = ti * 1000;  /* convert to ms */
    movesPerSession = 0;
  } else {
    timeIncrement = 0;
    movesPerSession = mps;
  }
  return TRUE;
}

void
InitBackEnd2 ()
{
    if (appData.debugMode) {
        fprintf(debugFP, "%s\n", programVersion);
    }
    ASSIGN(currentDebugFile, appData.nameOfDebugFile); // [HGM] debug split: remember initial name in use

    set_cont_sequence(appData.wrapContSeq);
    if (appData.matchGames > 0) {
        appData.matchMode = TRUE;
    } else if (appData.matchMode) {
        appData.matchGames = 1;
    }
    if(appData.matchMode && appData.sameColorGames > 0) /* [HGM] alternate: overrule matchGames */
        appData.matchGames = appData.sameColorGames;
    if(appData.rewindIndex > 1) { /* [HGM] autoinc: rewind implies auto-increment and overrules given index */
        if(appData.loadPositionIndex >= 0) appData.loadPositionIndex = -1;
        if(appData.loadGameIndex >= 0) appData.loadGameIndex = -1;
    }
    Reset(TRUE, FALSE);
    if (appData.noChessProgram || first.protocolVersion == 1) {
      InitBackEnd3();
    } else {
      /* kludge: allow timeout for initial "feature" commands */
      FreezeUI();
      DisplayMessage("", _("Starting chess program"));
      ScheduleDelayedEvent(InitBackEnd3, FEATURE_TIMEOUT);
    }
}

int
CalculateIndex (int index, int gameNr)
{   // [HGM] autoinc: absolute way to determine load index from game number (taking auto-inc and rewind into account)
    int res;
    if(index > 0) return index; // fixed nmber
    if(index == 0) return 1;
    res = (index == -1 ? gameNr : (gameNr-1)/2 + 1); // autoinc
    if(appData.rewindIndex > 0) res = (res-1) % appData.rewindIndex + 1; // rewind
    return res;
}

int
LoadGameOrPosition (int gameNr)
{   // [HGM] taken out of MatchEvent and NextMatchGame (to combine it)
    if (*appData.loadGameFile != NULLCHAR) {
        if (!LoadGameFromFile(appData.loadGameFile,
                CalculateIndex(appData.loadGameIndex, gameNr),
                              appData.loadGameFile, FALSE)) {
            DisplayFatalError(_("Bad game file"), 0, 1);
            return 0;
        }
    } else if (*appData.loadPositionFile != NULLCHAR) {
        if (!LoadPositionFromFile(appData.loadPositionFile,
                CalculateIndex(appData.loadPositionIndex, gameNr),
                                  appData.loadPositionFile)) {
            DisplayFatalError(_("Bad position file"), 0, 1);
            return 0;
        }
    }
    return 1;
}

void
ReserveGame (int gameNr, char resChar)
{
    FILE *tf = fopen(appData.tourneyFile, "r+");
    char *p, *q, c, buf[MSG_SIZ];
    if(tf == NULL) { nextGame = appData.matchGames + 1; return; } // kludge to terminate match
    safeStrCpy(buf, lastMsg, MSG_SIZ);
    DisplayMessage(_("Pick new game"), "");
    flock(fileno(tf), LOCK_EX); // lock the tourney file while we are messing with it
    ParseArgsFromFile(tf);
    p = q = appData.results;
    if(appData.debugMode) {
      char *r = appData.participants;
      fprintf(debugFP, "results = '%s'\n", p);
      while(*r) fprintf(debugFP, *r >= ' ' ? "%c" : "\\%03o", *r), r++;
      fprintf(debugFP, "\n");
    }
    while(*q && *q != ' ') q++; // get first un-played game (could be beyond end!)
    nextGame = q - p;
    q = malloc(strlen(p) + 2); // could be arbitrary long, but allow to extend by one!
    safeStrCpy(q, p, strlen(p) + 2);
    if(gameNr >= 0) q[gameNr] = resChar; // replace '*' with result
    if(appData.debugMode) fprintf(debugFP, "pick next game from '%s': %d\n", q, nextGame);
    if(nextGame <= appData.matchGames && resChar != ' ' && !abortMatch) { // reserve next game if tourney not yet done
        if(q[nextGame] == NULLCHAR) q[nextGame+1] = NULLCHAR; // append one char
        q[nextGame] = '*';
    }
    fseek(tf, -(strlen(p)+4), SEEK_END);
    c = fgetc(tf);
    if(c != '"') // depending on DOS or Unix line endings we can be one off
         fseek(tf, -(strlen(p)+2), SEEK_END);
    else fseek(tf, -(strlen(p)+3), SEEK_END);
    fprintf(tf, "%s\"\n", q); fclose(tf); // update, and flush by closing
    DisplayMessage(buf, "");
    free(p); appData.results = q;
    if(nextGame <= appData.matchGames && resChar != ' ' && !abortMatch &&
       (gameNr < 0 || nextGame / appData.defaultMatchGames != gameNr / appData.defaultMatchGames)) {
      int round = appData.defaultMatchGames * appData.tourneyType;
      if(gameNr < 0 || appData.tourneyType < 1 ||  // gauntlet engine can always stay loaded as first engine
         appData.tourneyType > 1 && nextGame/round != gameNr/round) // in multi-gauntlet change only after round
        UnloadEngine(&first);  // next game belongs to other pairing;
        UnloadEngine(&second); // already unload the engines, so TwoMachinesEvent will load new ones.
    }
    if(appData.debugMode) fprintf(debugFP, "Reserved, next=%d, nr=%d\n", nextGame, gameNr);
}

void
MatchEvent (int mode)
{       // [HGM] moved out of InitBackend3, to make it callable when match starts through menu
        int dummy;
        if(matchMode) { // already in match mode: switch it off
            abortMatch = TRUE;
            if(!appData.tourneyFile[0]) appData.matchGames = matchGame; // kludge to let match terminate after next game.
            return;
        }
//      if(gameMode != BeginningOfGame) {
//          DisplayError(_("You can only start a match from the initial position."), 0);
//          return;
//      }
        abortMatch = FALSE;
        if(mode == 2) appData.matchGames = appData.defaultMatchGames;
        /* Set up machine vs. machine match */
        nextGame = 0;
        NextTourneyGame(-1, &dummy); // sets appData.matchGames if this is tourney, to make sure ReserveGame knows it
        if(appData.tourneyFile[0]) {
            ReserveGame(-1, 0);
            if(nextGame > appData.matchGames) {
                char buf[MSG_SIZ];
                if(strchr(appData.results, '*') == NULL) {
                    FILE *f;
                    appData.tourneyCycles++;
                    if(f = WriteTourneyFile(appData.results, NULL)) { // make a tourney file with increased number of cycles
                        fclose(f);
                        NextTourneyGame(-1, &dummy);
                        ReserveGame(-1, 0);
                        if(nextGame <= appData.matchGames) {
                            DisplayNote(_("You restarted an already completed tourney\nOne more cycle will now be added to it\nGames commence in 10 sec"));
                            matchMode = mode;
                            ScheduleDelayedEvent(NextMatchGame, 10000);
                            return;
                        }
                    }
                }
                snprintf(buf, MSG_SIZ, _("All games in tourney '%s' are already played or playing"), appData.tourneyFile);
                DisplayError(buf, 0);
                appData.tourneyFile[0] = 0;
                return;
            }
        } else
        if (appData.noChessProgram) {  // [HGM] in tourney engines are loaded automatically
            DisplayFatalError(_("Can't have a match with no chess programs"),
                              0, 2);
            return;
        }
        matchMode = mode;
        matchGame = roundNr = 1;
        first.matchWins = second.matchWins = 0; // [HGM] match: needed in later matches
        NextMatchGame();
}

void
InitBackEnd3 P((void))
{
    GameMode initialMode;
    char buf[MSG_SIZ];
    int err, len;

    InitChessProgram(&first, startedFromSetupPosition);

    if(!appData.noChessProgram) {  /* [HGM] tidy: redo program version to use name from myname feature */
        free(programVersion);
        programVersion = (char*) malloc(8 + strlen(PACKAGE_STRING) + strlen(first.tidy));
        sprintf(programVersion, "%s + %s", PACKAGE_STRING, first.tidy);
        FloatToFront(&appData.recentEngineList, appData.firstChessProgram);
    }

    if (appData.icsActive) {
#ifdef WIN32
        /* [DM] Make a console window if needed [HGM] merged ifs */
        ConsoleCreate();
#endif
        err = establish();
        if (err != 0)
          {
            if (*appData.icsCommPort != NULLCHAR)
              len = snprintf(buf, MSG_SIZ, _("Could not open comm port %s"),
                             appData.icsCommPort);
            else
              len = snprintf(buf, MSG_SIZ, _("Could not connect to host %s, port %s"),
                        appData.icsHost, appData.icsPort);

            if( (len >= MSG_SIZ) && appData.debugMode )
              fprintf(debugFP, "InitBackEnd3: buffer truncated.\n");

            DisplayFatalError(buf, err, 1);
            return;
        }
        SetICSMode();
        telnetISR =
          AddInputSource(icsPR, FALSE, read_from_ics, &telnetISR);
        fromUserISR =
          AddInputSource(NoProc, FALSE, read_from_player, &fromUserISR);
        if(appData.keepAlive) // [HGM] alive: schedule sending of dummy 'date' command
            ScheduleDelayedEvent(KeepAlive, appData.keepAlive*60*1000);
    } else if (appData.noChessProgram) {
        SetNCPMode();
    } else {
        SetGNUMode();
    }

    if (*appData.cmailGameName != NULLCHAR) {
        SetCmailMode();
        OpenLoopback(&cmailPR);
        cmailISR =
          AddInputSource(cmailPR, FALSE, CmailSigHandlerCallBack, &cmailISR);
    }

    ThawUI();
    DisplayMessage("", "");
    if (StrCaseCmp(appData.initialMode, "") == 0) {
      initialMode = BeginningOfGame;
      if(!appData.icsActive && appData.noChessProgram) { // [HGM] could be fall-back
        gameMode = MachinePlaysBlack; // "Machine Black" might have been implicitly highlighted
        ModeHighlight(); // make sure XBoard knows it is highlighted, so it will un-highlight it
        gameMode = BeginningOfGame; // in case BeginningOfGame now means "Edit Position"
        ModeHighlight();
      }
    } else if (StrCaseCmp(appData.initialMode, "TwoMachines") == 0) {
      initialMode = TwoMachinesPlay;
    } else if (StrCaseCmp(appData.initialMode, "AnalyzeFile") == 0) {
      initialMode = AnalyzeFile;
    } else if (StrCaseCmp(appData.initialMode, "Analysis") == 0) {
      initialMode = AnalyzeMode;
    } else if (StrCaseCmp(appData.initialMode, "MachineWhite") == 0) {
      initialMode = MachinePlaysWhite;
    } else if (StrCaseCmp(appData.initialMode, "MachineBlack") == 0) {
      initialMode = MachinePlaysBlack;
    } else if (StrCaseCmp(appData.initialMode, "EditGame") == 0) {
      initialMode = EditGame;
    } else if (StrCaseCmp(appData.initialMode, "EditPosition") == 0) {
      initialMode = EditPosition;
    } else if (StrCaseCmp(appData.initialMode, "Training") == 0) {
      initialMode = Training;
    } else {
      len = snprintf(buf, MSG_SIZ, _("Unknown initialMode %s"), appData.initialMode);
      if( (len >= MSG_SIZ) && appData.debugMode )
        fprintf(debugFP, "InitBackEnd3: buffer truncated.\n");

      DisplayFatalError(buf, 0, 2);
      return;
    }

    if (appData.matchMode) {
        if(appData.tourneyFile[0]) { // start tourney from command line
            FILE *f;
            if(f = fopen(appData.tourneyFile, "r")) {
                ParseArgsFromFile(f); // make sure tourney parmeters re known
                fclose(f);
                appData.clockMode = TRUE;
                SetGNUMode();
            } else appData.tourneyFile[0] = NULLCHAR; // for now ignore bad tourney file
        }
        MatchEvent(TRUE);
    } else if (*appData.cmailGameName != NULLCHAR) {
        /* Set up cmail mode */
        ReloadCmailMsgEvent(TRUE);
    } else {
        /* Set up other modes */
        if (initialMode == AnalyzeFile) {
          if (*appData.loadGameFile == NULLCHAR) {
            DisplayFatalError(_("AnalyzeFile mode requires a game file"), 0, 1);
            return;
          }
        }
        if (*appData.loadGameFile != NULLCHAR) {
            (void) LoadGameFromFile(appData.loadGameFile,
                                    appData.loadGameIndex,
                                    appData.loadGameFile, TRUE);
        } else if (*appData.loadPositionFile != NULLCHAR) {
            (void) LoadPositionFromFile(appData.loadPositionFile,
                                        appData.loadPositionIndex,
                                        appData.loadPositionFile);
            /* [HGM] try to make self-starting even after FEN load */
            /* to allow automatic setup of fairy variants with wtm */
            if(initialMode == BeginningOfGame && !blackPlaysFirst) {
                gameMode = BeginningOfGame;
                setboardSpoiledMachineBlack = 1;
            }
            /* [HGM] loadPos: make that every new game uses the setup */
            /* from file as long as we do not switch variant          */
            if(!blackPlaysFirst) {
                startedFromPositionFile = TRUE;
                CopyBoard(filePosition, boards[0]);
            }
        }
        if (initialMode == AnalyzeMode) {
          if (appData.noChessProgram) {
            DisplayFatalError(_("Analysis mode requires a chess engine"), 0, 2);
            return;
          }
          if (appData.icsActive) {
            DisplayFatalError(_("Analysis mode does not work with ICS mode"),0,2);
            return;
          }
          AnalyzeModeEvent();
        } else if (initialMode == AnalyzeFile) {
          appData.showThinking = TRUE; // [HGM] thinking: moved out of ShowThinkingEvent
          ShowThinkingEvent();
          AnalyzeFileEvent();
          AnalysisPeriodicEvent(1);
        } else if (initialMode == MachinePlaysWhite) {
          if (appData.noChessProgram) {
            DisplayFatalError(_("MachineWhite mode requires a chess engine"),
                              0, 2);
            return;
          }
          if (appData.icsActive) {
            DisplayFatalError(_("MachineWhite mode does not work with ICS mode"),
                              0, 2);
            return;
          }
          MachineWhiteEvent();
        } else if (initialMode == MachinePlaysBlack) {
          if (appData.noChessProgram) {
            DisplayFatalError(_("MachineBlack mode requires a chess engine"),
                              0, 2);
            return;
          }
          if (appData.icsActive) {
            DisplayFatalError(_("MachineBlack mode does not work with ICS mode"),
                              0, 2);
            return;
          }
          MachineBlackEvent();
        } else if (initialMode == TwoMachinesPlay) {
          if (appData.noChessProgram) {
            DisplayFatalError(_("TwoMachines mode requires a chess engine"),
                              0, 2);
            return;
          }
          if (appData.icsActive) {
            DisplayFatalError(_("TwoMachines mode does not work with ICS mode"),
                              0, 2);
            return;
          }
          TwoMachinesEvent();
        } else if (initialMode == EditGame) {
          EditGameEvent();
        } else if (initialMode == EditPosition) {
          EditPositionEvent();
        } else if (initialMode == Training) {
          if (*appData.loadGameFile == NULLCHAR) {
            DisplayFatalError(_("Training mode requires a game file"), 0, 2);
            return;
          }
          TrainingEvent();
        }
    }
}

void
HistorySet (char movelist[][2*MOVE_LEN], int first, int last, int current)
{
    DisplayBook(current+1);

    MoveHistorySet( movelist, first, last, current, pvInfoList );

    EvalGraphSet( first, last, current, pvInfoList );

    MakeEngineOutputTitle();
}

/*
 * Establish will establish a contact to a remote host.port.
 * Sets icsPR to a ProcRef for a process (or pseudo-process)
 *  used to talk to the host.
 * Returns 0 if okay, error code if not.
 */
int
establish ()
{
    char buf[MSG_SIZ];

    if (*appData.icsCommPort != NULLCHAR) {
        /* Talk to the host through a serial comm port */
        return OpenCommPort(appData.icsCommPort, &icsPR);

    } else if (*appData.gateway != NULLCHAR) {
        if (*appData.remoteShell == NULLCHAR) {
            /* Use the rcmd protocol to run telnet program on a gateway host */
            snprintf(buf, sizeof(buf), "%s %s %s",
                    appData.telnetProgram, appData.icsHost, appData.icsPort);
            return OpenRcmd(appData.gateway, appData.remoteUser, buf, &icsPR);

        } else {
            /* Use the rsh program to run telnet program on a gateway host */
            if (*appData.remoteUser == NULLCHAR) {
                snprintf(buf, sizeof(buf), "%s %s %s %s %s", appData.remoteShell,
                        appData.gateway, appData.telnetProgram,
                        appData.icsHost, appData.icsPort);
            } else {
                snprintf(buf, sizeof(buf), "%s %s -l %s %s %s %s",
                        appData.remoteShell, appData.gateway,
                        appData.remoteUser, appData.telnetProgram,
                        appData.icsHost, appData.icsPort);
            }
            return StartChildProcess(buf, "", &icsPR);

        }
    } else if (appData.useTelnet) {
        return OpenTelnet(appData.icsHost, appData.icsPort, &icsPR);

    } else {
        /* TCP socket interface differs somewhat between
           Unix and NT; handle details in the front end.
           */
        return OpenTCP(appData.icsHost, appData.icsPort, &icsPR);
    }
}

void
EscapeExpand (char *p, char *q)
{       // [HGM] initstring: routine to shape up string arguments
        while(*p++ = *q++) if(p[-1] == '\\')
            switch(*q++) {
                case 'n': p[-1] = '\n'; break;
                case 'r': p[-1] = '\r'; break;
                case 't': p[-1] = '\t'; break;
                case '\\': p[-1] = '\\'; break;
                case 0: *p = 0; return;
                default: p[-1] = q[-1]; break;
            }
}

void
show_bytes (FILE *fp, char *buf, int count)
{
    while (count--) {
        if (*buf < 040 || *(unsigned char *) buf > 0177) {
            fprintf(fp, "\\%03o", *buf & 0xff);
        } else {
            putc(*buf, fp);
        }
        buf++;
    }
    fflush(fp);
}

/* Returns an errno value */
int
OutputMaybeTelnet (ProcRef pr, char *message, int count, int *outError)
{
    char buf[8192], *p, *q, *buflim;
    int left, newcount, outcount;

    if (*appData.icsCommPort != NULLCHAR || appData.useTelnet ||
        *appData.gateway != NULLCHAR) {
        if (appData.debugMode) {
            fprintf(debugFP, ">ICS: ");
            show_bytes(debugFP, message, count);
            fprintf(debugFP, "\n");
        }
        return OutputToProcess(pr, message, count, outError);
    }

    buflim = &buf[sizeof(buf)-1]; /* allow 1 byte for expanding last char */
    p = message;
    q = buf;
    left = count;
    newcount = 0;
    while (left) {
        if (q >= buflim) {
            if (appData.debugMode) {
                fprintf(debugFP, ">ICS: ");
                show_bytes(debugFP, buf, newcount);
                fprintf(debugFP, "\n");
            }
            outcount = OutputToProcess(pr, buf, newcount, outError);
            if (outcount < newcount) return -1; /* to be sure */
            q = buf;
            newcount = 0;
        }
        if (*p == '\n') {
            *q++ = '\r';
            newcount++;
        } else if (((unsigned char) *p) == TN_IAC) {
            *q++ = (char) TN_IAC;
            newcount ++;
        }
        *q++ = *p++;
        newcount++;
        left--;
    }
    if (appData.debugMode) {
        fprintf(debugFP, ">ICS: ");
        show_bytes(debugFP, buf, newcount);
        fprintf(debugFP, "\n");
    }
    outcount = OutputToProcess(pr, buf, newcount, outError);
    if (outcount < newcount) return -1; /* to be sure */
    return count;
}

void
read_from_player (InputSourceRef isr, VOIDSTAR closure, char *message, int count, int error)
{
    int outError, outCount;
    static int gotEof = 0;

    /* Pass data read from player on to ICS */
    if (count > 0) {
        gotEof = 0;
        outCount = OutputMaybeTelnet(icsPR, message, count, &outError);
        if (outCount < count) {
            DisplayFatalError(_("Error writing to ICS"), outError, 1);
        }
    } else if (count < 0) {
        RemoveInputSource(isr);
        DisplayFatalError(_("Error reading from keyboard"), error, 1);
    } else if (gotEof++ > 0) {
        RemoveInputSource(isr);
        DisplayFatalError(_("Got end of file from keyboard"), 0, 0);
    }
}

void
KeepAlive ()
{   // [HGM] alive: periodically send dummy (date) command to ICS to prevent time-out
    if(!connectionAlive) DisplayFatalError("No response from ICS", 0, 1);
    connectionAlive = FALSE; // only sticks if no response to 'date' command.
    SendToICS("date\n");
    if(appData.keepAlive) ScheduleDelayedEvent(KeepAlive, appData.keepAlive*60*1000);
}

/* added routine for printf style output to ics */
void
ics_printf (char *format, ...)
{
    char buffer[MSG_SIZ];
    va_list args;

    va_start(args, format);
    vsnprintf(buffer, sizeof(buffer), format, args);
    buffer[sizeof(buffer)-1] = '\0';
    SendToICS(buffer);
    va_end(args);
}

void
SendToICS (char *s)
{
    int count, outCount, outError;

    if (icsPR == NoProc) return;

    count = strlen(s);
    outCount = OutputMaybeTelnet(icsPR, s, count, &outError);
    if (outCount < count) {
        DisplayFatalError(_("Error writing to ICS"), outError, 1);
    }
}

/* This is used for sending logon scripts to the ICS. Sending
   without a delay causes problems when using timestamp on ICC
   (at least on my machine). */
void
SendToICSDelayed (char *s, long msdelay)
{
    int count, outCount, outError;

    if (icsPR == NoProc) return;

    count = strlen(s);
    if (appData.debugMode) {
        fprintf(debugFP, ">ICS: ");
        show_bytes(debugFP, s, count);
        fprintf(debugFP, "\n");
    }
    outCount = OutputToProcessDelayed(icsPR, s, count, &outError,
                                      msdelay);
    if (outCount < count) {
        DisplayFatalError(_("Error writing to ICS"), outError, 1);
    }
}


/* Remove all highlighting escape sequences in s
   Also deletes any suffix starting with '('
   */
char *
StripHighlightAndTitle (char *s)
{
    static char retbuf[MSG_SIZ];
    char *p = retbuf;

    while (*s != NULLCHAR) {
        while (*s == '\033') {
            while (*s != NULLCHAR && !isalpha(*s)) s++;
            if (*s != NULLCHAR) s++;
        }
        while (*s != NULLCHAR && *s != '\033') {
            if (*s == '(' || *s == '[') {
                *p = NULLCHAR;
                return retbuf;
            }
            *p++ = *s++;
        }
    }
    *p = NULLCHAR;
    return retbuf;
}

/* Remove all highlighting escape sequences in s */
char *
StripHighlight (char *s)
{
    static char retbuf[MSG_SIZ];
    char *p = retbuf;

    while (*s != NULLCHAR) {
        while (*s == '\033') {
            while (*s != NULLCHAR && !isalpha(*s)) s++;
            if (*s != NULLCHAR) s++;
        }
        while (*s != NULLCHAR && *s != '\033') {
            *p++ = *s++;
        }
    }
    *p = NULLCHAR;
    return retbuf;
}

char *variantNames[] = VARIANT_NAMES;
char *
VariantName (VariantClass v)
{
    return variantNames[v];
}


/* Identify a variant from the strings the chess servers use or the
   PGN Variant tag names we use. */
VariantClass
StringToVariant (char *e)
{
    char *p;
    int wnum = -1;
    VariantClass v = VariantNormal;
    int i, found = FALSE;
    char buf[MSG_SIZ];
    int len;

    if (!e) return v;

    /* [HGM] skip over optional board-size prefixes */
    if( sscanf(e, "%dx%d_", &i, &i) == 2 ||
        sscanf(e, "%dx%d+%d_", &i, &i, &i) == 3 ) {
        while( *e++ != '_');
    }

    if(StrCaseStr(e, "misc/")) { // [HGM] on FICS, misc/shogi is not shogi
        v = VariantNormal;
        found = TRUE;
    } else
    for (i=0; i<sizeof(variantNames)/sizeof(char*); i++) {
      if (StrCaseStr(e, variantNames[i])) {
        v = (VariantClass) i;
        found = TRUE;
        break;
      }
    }

    if (!found) {
      if ((StrCaseStr(e, "fischer") && StrCaseStr(e, "random"))
          || StrCaseStr(e, "wild/fr")
          || StrCaseStr(e, "frc") || StrCaseStr(e, "960")) {
        v = VariantFischeRandom;
      } else if ((i = 4, p = StrCaseStr(e, "wild")) ||
                 (i = 1, p = StrCaseStr(e, "w"))) {
        p += i;
        while (*p && (isspace(*p) || *p == '(' || *p == '/')) p++;
        if (isdigit(*p)) {
          wnum = atoi(p);
        } else {
          wnum = -1;
        }
        switch (wnum) {
        case 0: /* FICS only, actually */
        case 1:
          /* Castling legal even if K starts on d-file */
          v = VariantWildCastle;
          break;
        case 2:
        case 3:
        case 4:
          /* Castling illegal even if K & R happen to start in
             normal positions. */
          v = VariantNoCastle;
          break;
        case 5:
        case 7:
        case 8:
        case 10:
        case 11:
        case 12:
        case 13:
        case 14:
        case 15:
        case 18:
        case 19:
          /* Castling legal iff K & R start in normal positions */
          v = VariantNormal;
          break;
        case 6:
        case 20:
        case 21:
          /* Special wilds for position setup; unclear what to do here */
          v = VariantLoadable;
          break;
        case 9:
          /* Bizarre ICC game */
          v = VariantTwoKings;
          break;
        case 16:
          v = VariantKriegspiel;
          break;
        case 17:
          v = VariantLosers;
          break;
        case 22:
          v = VariantFischeRandom;
          break;
        case 23:
          v = VariantCrazyhouse;
          break;
        case 24:
          v = VariantBughouse;
          break;
        case 25:
          v = Variant3Check;
          break;
        case 26:
          /* Not quite the same as FICS suicide! */
          v = VariantGiveaway;
          break;
        case 27:
          v = VariantAtomic;
          break;
        case 28:
          v = VariantShatranj;
          break;

        /* Temporary names for future ICC types.  The name *will* change in
           the next xboard/WinBoard release after ICC defines it. */
        case 29:
          v = Variant29;
          break;
        case 30:
          v = Variant30;
          break;
        case 31:
          v = Variant31;
          break;
        case 32:
          v = Variant32;
          break;
        case 33:
          v = Variant33;
          break;
        case 34:
          v = Variant34;
          break;
        case 35:
          v = Variant35;
          break;
        case 36:
          v = Variant36;
          break;
        case 37:
          v = VariantShogi;
          break;
        case 38:
          v = VariantXiangqi;
          break;
        case 39:
          v = VariantCourier;
          break;
        case 40:
          v = VariantGothic;
          break;
        case 41:
          v = VariantCapablanca;
          break;
        case 42:
          v = VariantKnightmate;
          break;
        case 43:
          v = VariantFairy;
          break;
        case 44:
          v = VariantCylinder;
          break;
        case 45:
          v = VariantFalcon;
          break;
        case 46:
          v = VariantCapaRandom;
          break;
        case 47:
          v = VariantBerolina;
          break;
        case 48:
          v = VariantJanus;
          break;
        case 49:
          v = VariantSuper;
          break;
        case 50:
          v = VariantGreat;
          break;
        case -1:
          /* Found "wild" or "w" in the string but no number;
             must assume it's normal chess. */
          v = VariantNormal;
          break;
        default:
          len = snprintf(buf, MSG_SIZ, _("Unknown wild type %d"), wnum);
          if( (len >= MSG_SIZ) && appData.debugMode )
            fprintf(debugFP, "StringToVariant: buffer truncated.\n");

          DisplayError(buf, 0);
          v = VariantUnknown;
          break;
        }
      }
    }
    if (appData.debugMode) {
      fprintf(debugFP, _("recognized '%s' (%d) as variant %s\n"),
              e, wnum, VariantName(v));
    }
    return v;
}

static int leftover_start = 0, leftover_len = 0;
char star_match[STAR_MATCH_N][MSG_SIZ];

/* Test whether pattern is present at &buf[*index]; if so, return TRUE,
   advance *index beyond it, and set leftover_start to the new value of
   *index; else return FALSE.  If pattern contains the character '*', it
   matches any sequence of characters not containing '\r', '\n', or the
   character following the '*' (if any), and the matched sequence(s) are
   copied into star_match.
   */
int
looking_at ( char *buf, int *index, char *pattern)
{
    char *bufp = &buf[*index], *patternp = pattern;
    int star_count = 0;
    char *matchp = star_match[0];

    for (;;) {
        if (*patternp == NULLCHAR) {
            *index = leftover_start = bufp - buf;
            *matchp = NULLCHAR;
            return TRUE;
        }
        if (*bufp == NULLCHAR) return FALSE;
        if (*patternp == '*') {
            if (*bufp == *(patternp + 1)) {
                *matchp = NULLCHAR;
                matchp = star_match[++star_count];
                patternp += 2;
                bufp++;
                continue;
            } else if (*bufp == '\n' || *bufp == '\r') {
                patternp++;
                if (*patternp == NULLCHAR)
                  continue;
                else
                  return FALSE;
            } else {
                *matchp++ = *bufp++;
                continue;
            }
        }
        if (*patternp != *bufp) return FALSE;
        patternp++;
        bufp++;
    }
}

void
SendToPlayer (char *data, int length)
{
    int error, outCount;
    outCount = OutputToProcess(NoProc, data, length, &error);
    if (outCount < length) {
        DisplayFatalError(_("Error writing to display"), error, 1);
    }
}

void
PackHolding (char packed[], char *holding)
{
    char *p = holding;
    char *q = packed;
    int runlength = 0;
    int curr = 9999;
    do {
        if (*p == curr) {
            runlength++;
        } else {
            switch (runlength) {
              case 0:
                break;
              case 1:
                *q++ = curr;
                break;
              case 2:
                *q++ = curr;
                *q++ = curr;
                break;
              default:
                sprintf(q, "%d", runlength);
                while (*q) q++;
                *q++ = curr;
                break;
            }
            runlength = 1;
            curr = *p;
        }
    } while (*p++);
    *q = NULLCHAR;
}

/* Telnet protocol requests from the front end */
void
TelnetRequest (unsigned char ddww, unsigned char option)
{
    unsigned char msg[3];
    int outCount, outError;

    if (*appData.icsCommPort != NULLCHAR || appData.useTelnet) return;

    if (appData.debugMode) {
        char buf1[8], buf2[8], *ddwwStr, *optionStr;
        switch (ddww) {
          case TN_DO:
            ddwwStr = "DO";
            break;
          case TN_DONT:
            ddwwStr = "DONT";
            break;
          case TN_WILL:
            ddwwStr = "WILL";
            break;
          case TN_WONT:
            ddwwStr = "WONT";
            break;
          default:
            ddwwStr = buf1;
            snprintf(buf1,sizeof(buf1)/sizeof(buf1[0]), "%d", ddww);
            break;
        }
        switch (option) {
          case TN_ECHO:
            optionStr = "ECHO";
            break;
          default:
            optionStr = buf2;
            snprintf(buf2,sizeof(buf2)/sizeof(buf2[0]), "%d", option);
            break;
        }
        fprintf(debugFP, ">%s %s ", ddwwStr, optionStr);
    }
    msg[0] = TN_IAC;
    msg[1] = ddww;
    msg[2] = option;
    outCount = OutputToProcess(icsPR, (char *)msg, 3, &outError);
    if (outCount < 3) {
        DisplayFatalError(_("Error writing to ICS"), outError, 1);
    }
}

void
DoEcho ()
{
    if (!appData.icsActive) return;
    TelnetRequest(TN_DO, TN_ECHO);
}

void
DontEcho ()
{
    if (!appData.icsActive) return;
    TelnetRequest(TN_DONT, TN_ECHO);
}

void
CopyHoldings (Board board, char *holdings, ChessSquare lowestPiece)
{
    /* put the holdings sent to us by the server on the board holdings area */
    int i, j, holdingsColumn, holdingsStartRow, direction, countsColumn;
    char p;
    ChessSquare piece;

    if(gameInfo.holdingsWidth < 2)  return;
    if(gameInfo.variant != VariantBughouse && board[HOLDINGS_SET])
        return; // prevent overwriting by pre-board holdings

    if( (int)lowestPiece >= BlackPawn ) {
        holdingsColumn = 0;
        countsColumn = 1;
        holdingsStartRow = BOARD_HEIGHT-1;
        direction = -1;
    } else {
        holdingsColumn = BOARD_WIDTH-1;
        countsColumn = BOARD_WIDTH-2;
        holdingsStartRow = 0;
        direction = 1;
    }

    for(i=0; i<BOARD_HEIGHT; i++) { /* clear holdings */
        board[i][holdingsColumn] = EmptySquare;
        board[i][countsColumn]   = (ChessSquare) 0;
    }
    while( (p=*holdings++) != NULLCHAR ) {
        piece = CharToPiece( ToUpper(p) );
        if(piece == EmptySquare) continue;
        /*j = (int) piece - (int) WhitePawn;*/
        j = PieceToNumber(piece);
        if(j >= gameInfo.holdingsSize) continue; /* ignore pieces that do not fit */
        if(j < 0) continue;               /* should not happen */
        piece = (ChessSquare) ( (int)piece + (int)lowestPiece );
        board[holdingsStartRow+j*direction][holdingsColumn] = piece;
        board[holdingsStartRow+j*direction][countsColumn]++;
    }
}


void
VariantSwitch (Board board, VariantClass newVariant)
{
   int newHoldingsWidth, newWidth = 8, newHeight = 8, i, j;
   static Board oldBoard;

   startedFromPositionFile = FALSE;
   if(gameInfo.variant == newVariant) return;

   /* [HGM] This routine is called each time an assignment is made to
    * gameInfo.variant during a game, to make sure the board sizes
    * are set to match the new variant. If that means adding or deleting
    * holdings, we shift the playing board accordingly
    * This kludge is needed because in ICS observe mode, we get boards
    * of an ongoing game without knowing the variant, and learn about the
    * latter only later. This can be because of the move list we requested,
    * in which case the game history is refilled from the beginning anyway,
    * but also when receiving holdings of a crazyhouse game. In the latter
    * case we want to add those holdings to the already received position.
    */


   if (appData.debugMode) {
     fprintf(debugFP, "Switch board from %s to %s\n",
             VariantName(gameInfo.variant), VariantName(newVariant));
     setbuf(debugFP, NULL);
   }
   shuffleOpenings = 0;       /* [HGM] shuffle */
   gameInfo.holdingsSize = 5; /* [HGM] prepare holdings */
   switch(newVariant)
     {
     case VariantShogi:
       newWidth = 9;  newHeight = 9;
       gameInfo.holdingsSize = 7;
     case VariantBughouse:
     case VariantCrazyhouse:
       newHoldingsWidth = 2; break;
     case VariantGreat:
       newWidth = 10;
     case VariantSuper:
       newHoldingsWidth = 2;
       gameInfo.holdingsSize = 8;
       break;
     case VariantGothic:
     case VariantCapablanca:
     case VariantCapaRandom:
       newWidth = 10;
     default:
       newHoldingsWidth = gameInfo.holdingsSize = 0;
     };

   if(newWidth  != gameInfo.boardWidth  ||
      newHeight != gameInfo.boardHeight ||
      newHoldingsWidth != gameInfo.holdingsWidth ) {

     /* shift position to new playing area, if needed */
     if(newHoldingsWidth > gameInfo.holdingsWidth) {
       for(i=0; i<BOARD_HEIGHT; i++)
         for(j=BOARD_RGHT-1; j>=BOARD_LEFT; j--)
           board[i][j+newHoldingsWidth-gameInfo.holdingsWidth] =
             board[i][j];
       for(i=0; i<newHeight; i++) {
         board[i][0] = board[i][newWidth+2*newHoldingsWidth-1] = EmptySquare;
         board[i][1] = board[i][newWidth+2*newHoldingsWidth-2] = (ChessSquare) 0;
       }
     } else if(newHoldingsWidth < gameInfo.holdingsWidth) {
       for(i=0; i<BOARD_HEIGHT; i++)
         for(j=BOARD_LEFT; j<BOARD_RGHT; j++)
           board[i][j+newHoldingsWidth-gameInfo.holdingsWidth] =
             board[i][j];
     }
     gameInfo.boardWidth  = newWidth;
     gameInfo.boardHeight = newHeight;
     gameInfo.holdingsWidth = newHoldingsWidth;
     gameInfo.variant = newVariant;
     InitDrawingSizes(-2, 0);
   } else gameInfo.variant = newVariant;
   CopyBoard(oldBoard, board);   // remember correctly formatted board
     InitPosition(FALSE);          /* this sets up board[0], but also other stuff        */
   DrawPosition(TRUE, currentMove ? boards[currentMove] : oldBoard);
}

static int loggedOn = FALSE;

/*-- Game start info cache: --*/
int gs_gamenum;
char gs_kind[MSG_SIZ];
static char player1Name[128] = "";
static char player2Name[128] = "";
static char cont_seq[] = "\n\\   ";
static int player1Rating = -1;
static int player2Rating = -1;
/*----------------------------*/

ColorClass curColor = ColorNormal;
int suppressKibitz = 0;

// [HGM] seekgraph
Boolean soughtPending = FALSE;
Boolean seekGraphUp;
#define MAX_SEEK_ADS 200
#define SQUARE 0x80
char *seekAdList[MAX_SEEK_ADS];
int ratingList[MAX_SEEK_ADS], xList[MAX_SEEK_ADS], yList[MAX_SEEK_ADS], seekNrList[MAX_SEEK_ADS], zList[MAX_SEEK_ADS];
float tcList[MAX_SEEK_ADS];
char colorList[MAX_SEEK_ADS];
int nrOfSeekAds = 0;
int minRating = 1010, maxRating = 2800;
int hMargin = 10, vMargin = 20, h, w;
extern int squareSize, lineGap;

void
PlotSeekAd (int i)
{
        int x, y, color = 0, r = ratingList[i]; float tc = tcList[i];
        xList[i] = yList[i] = -100; // outside graph, so cannot be clicked
        if(r < minRating+100 && r >=0 ) r = minRating+100;
        if(r > maxRating) r = maxRating;
        if(tc < 1.) tc = 1.;
        if(tc > 95.) tc = 95.;
        x = (w-hMargin-squareSize/8-7)* log(tc)/log(95.) + hMargin;
        y = ((double)r - minRating)/(maxRating - minRating)
            * (h-vMargin-squareSize/8-1) + vMargin;
        if(ratingList[i] < 0) y = vMargin + squareSize/4;
        if(strstr(seekAdList[i], " u ")) color = 1;
        if(!strstr(seekAdList[i], "lightning") && // for now all wilds same color
           !strstr(seekAdList[i], "bullet") &&
           !strstr(seekAdList[i], "blitz") &&
           !strstr(seekAdList[i], "standard") ) color = 2;
        if(strstr(seekAdList[i], "(C) ")) color |= SQUARE; // plot computer seeks as squares
        DrawSeekDot(xList[i]=x+3*(color&~SQUARE), yList[i]=h-1-y, colorList[i]=color);
}

void
AddAd (char *handle, char *rating, int base, int inc,  char rated, char *type, int nr, Boolean plot)
{
        char buf[MSG_SIZ], *ext = "";
        VariantClass v = StringToVariant(type);
        if(strstr(type, "wild")) {
            ext = type + 4; // append wild number
            if(v == VariantFischeRandom) type = "chess960"; else
            if(v == VariantLoadable) type = "setup"; else
            type = VariantName(v);
        }
        snprintf(buf, MSG_SIZ, "%s (%s) %d %d %c %s%s", handle, rating, base, inc, rated, type, ext);
        if(nrOfSeekAds < MAX_SEEK_ADS-1) {
            if(seekAdList[nrOfSeekAds]) free(seekAdList[nrOfSeekAds]);
            ratingList[nrOfSeekAds] = -1; // for if seeker has no rating
            sscanf(rating, "%d", &ratingList[nrOfSeekAds]);
            tcList[nrOfSeekAds] = base + (2./3.)*inc;
            seekNrList[nrOfSeekAds] = nr;
            zList[nrOfSeekAds] = 0;
            seekAdList[nrOfSeekAds++] = StrSave(buf);
            if(plot) PlotSeekAd(nrOfSeekAds-1);
        }
}

void
EraseSeekDot (int i)
{
    int x = xList[i], y = yList[i], d=squareSize/4, k;
    DrawSeekBackground(x-squareSize/8, y-squareSize/8, x+squareSize/8+1, y+squareSize/8+1);
    if(x < hMargin+d) DrawSeekAxis(hMargin, y-squareSize/8, hMargin, y+squareSize/8+1);
    // now replot every dot that overlapped
    for(k=0; k<nrOfSeekAds; k++) if(k != i) {
        int xx = xList[k], yy = yList[k];
        if(xx <= x+d && xx > x-d && yy <= y+d && yy > y-d)
            DrawSeekDot(xx, yy, colorList[k]);
    }
}

void
RemoveSeekAd (int nr)
{
        int i;
        for(i=0; i<nrOfSeekAds; i++) if(seekNrList[i] == nr) {
            EraseSeekDot(i);
            if(seekAdList[i]) free(seekAdList[i]);
            seekAdList[i] = seekAdList[--nrOfSeekAds];
            seekNrList[i] = seekNrList[nrOfSeekAds];
            ratingList[i] = ratingList[nrOfSeekAds];
            colorList[i]  = colorList[nrOfSeekAds];
            tcList[i] = tcList[nrOfSeekAds];
            xList[i]  = xList[nrOfSeekAds];
            yList[i]  = yList[nrOfSeekAds];
            zList[i]  = zList[nrOfSeekAds];
            seekAdList[nrOfSeekAds] = NULL;
            break;
        }
}

Boolean
MatchSoughtLine (char *line)
{
    char handle[MSG_SIZ], rating[MSG_SIZ], type[MSG_SIZ];
    int nr, base, inc, u=0; char dummy;

    if(sscanf(line, "%d %s %s %d %d rated %s", &nr, rating, handle, &base, &inc, type) == 6 ||
       sscanf(line, "%d %s %s %s %d %d rated %c", &nr, rating, handle, type, &base, &inc, &dummy) == 7 ||
       (u=1) &&
       (sscanf(line, "%d %s %s %d %d unrated %s", &nr, rating, handle, &base, &inc, type) == 6 ||
        sscanf(line, "%d %s %s %s %d %d unrated %c", &nr, rating, handle, type, &base, &inc, &dummy) == 7)  ) {
        // match: compact and save the line
        AddAd(handle, rating, base, inc, u ? 'u' : 'r', type, nr, FALSE);
        return TRUE;
    }
    return FALSE;
}

int
DrawSeekGraph ()
{
    int i;
    if(!seekGraphUp) return FALSE;
    h = BOARD_HEIGHT * (squareSize + lineGap) + lineGap;
    w = BOARD_WIDTH  * (squareSize + lineGap) + lineGap;

    DrawSeekBackground(0, 0, w, h);
    DrawSeekAxis(hMargin, h-1-vMargin, w-5, h-1-vMargin);
    DrawSeekAxis(hMargin, h-1-vMargin, hMargin, 5);
    for(i=0; i<4000; i+= 100) if(i>=minRating && i<maxRating) {
        int yy =((double)i - minRating)/(maxRating - minRating)*(h-vMargin-squareSize/8-1) + vMargin;
        yy = h-1-yy;
        DrawSeekAxis(hMargin+5*(i%500==0), yy, hMargin-5, yy); // rating ticks
        if(i%500 == 0) {
            char buf[MSG_SIZ];
            snprintf(buf, MSG_SIZ, "%d", i);
            DrawSeekText(buf, hMargin+squareSize/8+7, yy);
        }
    }
    DrawSeekText("unrated", hMargin+squareSize/8+7, h-1-vMargin-squareSize/4);
    for(i=1; i<100; i+=(i<10?1:5)) {
        int xx = (w-hMargin-squareSize/8-7)* log((double)i)/log(95.) + hMargin;
        DrawSeekAxis(xx, h-1-vMargin, xx, h-6-vMargin-3*(i%10==0)); // TC ticks
        if(i<=5 || (i>40 ? i%20 : i%10) == 0) {
            char buf[MSG_SIZ];
            snprintf(buf, MSG_SIZ, "%d", i);
            DrawSeekText(buf, xx-2-3*(i>9), h-1-vMargin/2);
        }
    }
    for(i=0; i<nrOfSeekAds; i++) PlotSeekAd(i);
    return TRUE;
}

int
SeekGraphClick (ClickType click, int x, int y, int moving)
{
    static int lastDown = 0, displayed = 0, lastSecond;
    if(y < 0) return FALSE;
    if(!seekGraphUp) { // initiate cration of seek graph by requesting seek-ad list
        if(click == Release || moving) return FALSE;
        nrOfSeekAds = 0;
        soughtPending = TRUE;
        SendToICS(ics_prefix);
        SendToICS("sought\n"); // should this be "sought all"?
    } else { // issue challenge based on clicked ad
        int dist = 10000; int i, closest = 0, second = 0;
        for(i=0; i<nrOfSeekAds; i++) {
            int d = (x-xList[i])*(x-xList[i]) +  (y-yList[i])*(y-yList[i]) + zList[i];
            if(d < dist) { dist = d; closest = i; }
            second += (d - zList[i] < 120); // count in-range ads
            if(click == Press && moving != 1 && zList[i]>0) zList[i] *= 0.8; // age priority
        }
        if(dist < 120) {
            char buf[MSG_SIZ];
            second = (second > 1);
            if(displayed != closest || second != lastSecond) {
                DisplayMessage(second ? "!" : "", seekAdList[closest]);
                lastSecond = second; displayed = closest;
            }
            if(click == Press) {
                if(moving == 2) zList[closest] = 100; // right-click; push to back on press
                lastDown = closest;
                return TRUE;
            } // on press 'hit', only show info
            if(moving == 2) return TRUE; // ignore right up-clicks on dot
            snprintf(buf, MSG_SIZ, "play %d\n", seekNrList[closest]);
            SendToICS(ics_prefix);
            SendToICS(buf);
            return TRUE; // let incoming board of started game pop down the graph
        } else if(click == Release) { // release 'miss' is ignored
            zList[lastDown] = 100; // make future selection of the rejected ad more difficult
            if(moving == 2) { // right up-click
                nrOfSeekAds = 0; // refresh graph
                soughtPending = TRUE;
                SendToICS(ics_prefix);
                SendToICS("sought\n"); // should this be "sought all"?
            }
            return TRUE;
        } else if(moving) { if(displayed >= 0) DisplayMessage("", ""); displayed = -1; return TRUE; }
        // press miss or release hit 'pop down' seek graph
        seekGraphUp = FALSE;
        DrawPosition(TRUE, NULL);
    }
    return TRUE;
}

void
read_from_ics (InputSourceRef isr, VOIDSTAR closure, char *data, int count, int error)
{
#define BUF_SIZE (16*1024) /* overflowed at 8K with "inchannel 1" on FICS? */
#define STARTED_NONE 0
#define STARTED_MOVES 1
#define STARTED_BOARD 2
#define STARTED_OBSERVE 3
#define STARTED_HOLDINGS 4
#define STARTED_CHATTER 5
#define STARTED_COMMENT 6
#define STARTED_MOVES_NOHIDE 7

    static int started = STARTED_NONE;
    static char parse[20000];
    static int parse_pos = 0;
    static char buf[BUF_SIZE + 1];
    static int firstTime = TRUE, intfSet = FALSE;
    static ColorClass prevColor = ColorNormal;
    static int savingComment = FALSE;
    static int cmatch = 0; // continuation sequence match
    char *bp;
    char str[MSG_SIZ];
    int i, oldi;
    int buf_len;
    int next_out;
    int tkind;
    int backup;    /* [DM] For zippy color lines */
    char *p;
    char talker[MSG_SIZ]; // [HGM] chat
    int channel;

    connectionAlive = TRUE; // [HGM] alive: I think, therefore I am...

    if (appData.debugMode) {
      if (!error) {
        fprintf(debugFP, "<ICS: ");
        show_bytes(debugFP, data, count);
        fprintf(debugFP, "\n");
      }
    }

    if (appData.debugMode) { int f = forwardMostMove;
        fprintf(debugFP, "ics input %d, castling = %d %d %d %d %d %d\n", f,
                boards[f][CASTLING][0],boards[f][CASTLING][1],boards[f][CASTLING][2],
                boards[f][CASTLING][3],boards[f][CASTLING][4],boards[f][CASTLING][5]);
    }
    if (count > 0) {
        /* If last read ended with a partial line that we couldn't parse,
           prepend it to the new read and try again. */
        if (leftover_len > 0) {
            for (i=0; i<leftover_len; i++)
              buf[i] = buf[leftover_start + i];
        }

    /* copy new characters into the buffer */
    bp = buf + leftover_len;
    buf_len=leftover_len;
    for (i=0; i<count; i++)
    {
        // ignore these
        if (data[i] == '\r')
            continue;

        // join lines split by ICS?
        if (!appData.noJoin)
        {
            /*
                Joining just consists of finding matches against the
                continuation sequence, and discarding that sequence
                if found instead of copying it.  So, until a match
                fails, there's nothing to do since it might be the
                complete sequence, and thus, something we don't want
                copied.
            */
            if (data[i] == cont_seq[cmatch])
            {
                cmatch++;
                if (cmatch == strlen(cont_seq))
                {
                    cmatch = 0; // complete match.  just reset the counter

                    /*
                        it's possible for the ICS to not include the space
                        at the end of the last word, making our [correct]
                        join operation fuse two separate words.  the server
                        does this when the space occurs at the width setting.
                    */
                    if (!buf_len || buf[buf_len-1] != ' ')
                    {
                        *bp++ = ' ';
                        buf_len++;
                    }
                }
                continue;
            }
            else if (cmatch)
            {
                /*
                    match failed, so we have to copy what matched before
                    falling through and copying this character.  In reality,
                    this will only ever be just the newline character, but
                    it doesn't hurt to be precise.
                */
                strncpy(bp, cont_seq, cmatch);
                bp += cmatch;
                buf_len += cmatch;
                cmatch = 0;
            }
        }

        // copy this char
        *bp++ = data[i];
        buf_len++;
    }

        buf[buf_len] = NULLCHAR;
//      next_out = leftover_len; // [HGM] should we set this to 0, and not print it in advance?
        next_out = 0;
        leftover_start = 0;

        i = 0;
        while (i < buf_len) {
            /* Deal with part of the TELNET option negotiation
               protocol.  We refuse to do anything beyond the
               defaults, except that we allow the WILL ECHO option,
               which ICS uses to turn off password echoing when we are
               directly connected to it.  We reject this option
               if localLineEditing mode is on (always on in xboard)
               and we are talking to port 23, which might be a real
               telnet server that will try to keep WILL ECHO on permanently.
             */
            if (buf_len - i >= 3 && (unsigned char) buf[i] == TN_IAC) {
                static int remoteEchoOption = FALSE; /* telnet ECHO option */
                unsigned char option;
                oldi = i;
                switch ((unsigned char) buf[++i]) {
                  case TN_WILL:
                    if (appData.debugMode)
                      fprintf(debugFP, "\n<WILL ");
                    switch (option = (unsigned char) buf[++i]) {
                      case TN_ECHO:
                        if (appData.debugMode)
                          fprintf(debugFP, "ECHO ");
                        /* Reply only if this is a change, according
                           to the protocol rules. */
                        if (remoteEchoOption) break;
                        if (appData.localLineEditing &&
                            atoi(appData.icsPort) == TN_PORT) {
                            TelnetRequest(TN_DONT, TN_ECHO);
                        } else {
                            EchoOff();
                            TelnetRequest(TN_DO, TN_ECHO);
                            remoteEchoOption = TRUE;
                        }
                        break;
                      default:
                        if (appData.debugMode)
                          fprintf(debugFP, "%d ", option);
                        /* Whatever this is, we don't want it. */
                        TelnetRequest(TN_DONT, option);
                        break;
                    }
                    break;
                  case TN_WONT:
                    if (appData.debugMode)
                      fprintf(debugFP, "\n<WONT ");
                    switch (option = (unsigned char) buf[++i]) {
                      case TN_ECHO:
                        if (appData.debugMode)
                          fprintf(debugFP, "ECHO ");
                        /* Reply only if this is a change, according
                           to the protocol rules. */
                        if (!remoteEchoOption) break;
                        EchoOn();
                        TelnetRequest(TN_DONT, TN_ECHO);
                        remoteEchoOption = FALSE;
                        break;
                      default:
                        if (appData.debugMode)
                          fprintf(debugFP, "%d ", (unsigned char) option);
                        /* Whatever this is, it must already be turned
                           off, because we never agree to turn on
                           anything non-default, so according to the
                           protocol rules, we don't reply. */
                        break;
                    }
                    break;
                  case TN_DO:
                    if (appData.debugMode)
                      fprintf(debugFP, "\n<DO ");
                    switch (option = (unsigned char) buf[++i]) {
                      default:
                        /* Whatever this is, we refuse to do it. */
                        if (appData.debugMode)
                          fprintf(debugFP, "%d ", option);
                        TelnetRequest(TN_WONT, option);
                        break;
                    }
                    break;
                  case TN_DONT:
                    if (appData.debugMode)
                      fprintf(debugFP, "\n<DONT ");
                    switch (option = (unsigned char) buf[++i]) {
                      default:
                        if (appData.debugMode)
                          fprintf(debugFP, "%d ", option);
                        /* Whatever this is, we are already not doing
                           it, because we never agree to do anything
                           non-default, so according to the protocol
                           rules, we don't reply. */
                        break;
                    }
                    break;
                  case TN_IAC:
                    if (appData.debugMode)
                      fprintf(debugFP, "\n<IAC ");
                    /* Doubled IAC; pass it through */
                    i--;
                    break;
                  default:
                    if (appData.debugMode)
                      fprintf(debugFP, "\n<%d ", (unsigned char) buf[i]);
                    /* Drop all other telnet commands on the floor */
                    break;
                }
                if (oldi > next_out)
                  SendToPlayer(&buf[next_out], oldi - next_out);
                if (++i > next_out)
                  next_out = i;
                continue;
            }

            /* OK, this at least will *usually* work */
            if (!loggedOn && looking_at(buf, &i, "ics%")) {
                loggedOn = TRUE;
            }

            if (loggedOn && !intfSet) {
                if (ics_type == ICS_ICC) {
                  snprintf(str, MSG_SIZ,
                          "/set-quietly interface %s\n/set-quietly style 12\n",
                          programVersion);
                  if(appData.seekGraph && appData.autoRefresh) // [HGM] seekgraph
                      strcat(str, "/set-2 51 1\n/set seek 1\n");
                } else if (ics_type == ICS_CHESSNET) {
                  snprintf(str, MSG_SIZ, "/style 12\n");
                } else {
                  safeStrCpy(str, "alias $ @\n$set interface ", sizeof(str)/sizeof(str[0]));
                  strcat(str, programVersion);
                  strcat(str, "\n$iset startpos 1\n$iset ms 1\n");
                  if(appData.seekGraph && appData.autoRefresh) // [HGM] seekgraph
                      strcat(str, "$iset seekremove 1\n$set seek 1\n");
#ifdef WIN32
                  strcat(str, "$iset nohighlight 1\n");
#endif
                  strcat(str, "$iset lock 1\n$style 12\n");
                }
                SendToICS(str);
                NotifyFrontendLogin();
                intfSet = TRUE;
            }

            if (started == STARTED_COMMENT) {
                /* Accumulate characters in comment */
                parse[parse_pos++] = buf[i];
                if (buf[i] == '\n') {
                    parse[parse_pos] = NULLCHAR;
                    if(chattingPartner>=0) {
                        char mess[MSG_SIZ];
                        snprintf(mess, MSG_SIZ, "%s%s", talker, parse);
                        OutputChatMessage(chattingPartner, mess);
                        chattingPartner = -1;
                        next_out = i+1; // [HGM] suppress printing in ICS window
                    } else
                    if(!suppressKibitz) // [HGM] kibitz
                        AppendComment(forwardMostMove, StripHighlight(parse), TRUE);
                    else { // [HGM kibitz: divert memorized engine kibitz to engine-output window
                        int nrDigit = 0, nrAlph = 0, j;
                        if(parse_pos > MSG_SIZ - 30) // defuse unreasonably long input
                        { parse_pos = MSG_SIZ-30; parse[parse_pos - 1] = '\n'; }
                        parse[parse_pos] = NULLCHAR;
                        // try to be smart: if it does not look like search info, it should go to
                        // ICS interaction window after all, not to engine-output window.
                        for(j=0; j<parse_pos; j++) { // count letters and digits
                            nrDigit += (parse[j] >= '0' && parse[j] <= '9');
                            nrAlph  += (parse[j] >= 'a' && parse[j] <= 'z');
                            nrAlph  += (parse[j] >= 'A' && parse[j] <= 'Z');
                        }
                        if(nrAlph < 9*nrDigit) { // if more than 10% digit we assume search info
                            int depth=0; float score;
                            if(sscanf(parse, "!!! %f/%d", &score, &depth) == 2 && depth>0) {
                                // [HGM] kibitz: save kibitzed opponent info for PGN and eval graph
                                pvInfoList[forwardMostMove-1].depth = depth;
                                pvInfoList[forwardMostMove-1].score = 100*score;
                            }
                            OutputKibitz(suppressKibitz, parse);
                        } else {
                            char tmp[MSG_SIZ];
                            if(gameMode == IcsObserving) // restore original ICS messages
                              snprintf(tmp, MSG_SIZ, "%s kibitzes: %s", star_match[0], parse);
                            else
                            snprintf(tmp, MSG_SIZ, _("your opponent kibitzes: %s"), parse);
                            SendToPlayer(tmp, strlen(tmp));
                        }
                        next_out = i+1; // [HGM] suppress printing in ICS window
                    }
                    started = STARTED_NONE;
                } else {
                    /* Don't match patterns against characters in comment */
                    i++;
                    continue;
                }
            }
            if (started == STARTED_CHATTER) {
                if (buf[i] != '\n') {
                    /* Don't match patterns against characters in chatter */
                    i++;
                    continue;
                }
                started = STARTED_NONE;
                if(suppressKibitz) next_out = i+1;
            }

            /* Kludge to deal with rcmd protocol */
            if (firstTime && looking_at(buf, &i, "\001*")) {
                DisplayFatalError(&buf[1], 0, 1);
                continue;
            } else {
                firstTime = FALSE;
            }

            if (!loggedOn && looking_at(buf, &i, "chessclub.com")) {
                ics_type = ICS_ICC;
                ics_prefix = "/";
                if (appData.debugMode)
                  fprintf(debugFP, "ics_type %d\n", ics_type);
                continue;
            }
            if (!loggedOn && looking_at(buf, &i, "freechess.org")) {
                ics_type = ICS_FICS;
                ics_prefix = "$";
                if (appData.debugMode)
                  fprintf(debugFP, "ics_type %d\n", ics_type);
                continue;
            }
            if (!loggedOn && looking_at(buf, &i, "chess.net")) {
                ics_type = ICS_CHESSNET;
                ics_prefix = "/";
                if (appData.debugMode)
                  fprintf(debugFP, "ics_type %d\n", ics_type);
                continue;
            }

            if (!loggedOn &&
                (looking_at(buf, &i, "\"*\" is *a registered name") ||
                 looking_at(buf, &i, "Logging you in as \"*\"") ||
                 looking_at(buf, &i, "will be \"*\""))) {
              safeStrCpy(ics_handle, star_match[0], sizeof(ics_handle)/sizeof(ics_handle[0]));
              continue;
            }

            if (loggedOn && !have_set_title && ics_handle[0] != NULLCHAR) {
              char buf[MSG_SIZ];
              snprintf(buf, sizeof(buf), "%s@%s", ics_handle, appData.icsHost);
              DisplayIcsInteractionTitle(buf);
              have_set_title = TRUE;
            }

            /* skip finger notes */
            if (started == STARTED_NONE &&
                ((buf[i] == ' ' && isdigit(buf[i+1])) ||
                 (buf[i] == '1' && buf[i+1] == '0')) &&
                buf[i+2] == ':' && buf[i+3] == ' ') {
              started = STARTED_CHATTER;
              i += 3;
              continue;
            }

            oldi = i;
            // [HGM] seekgraph: recognize sought lines and end-of-sought message
            if(appData.seekGraph) {
                if(soughtPending && MatchSoughtLine(buf+i)) {
                    i = strstr(buf+i, "rated") - buf;
                    if (oldi > next_out) SendToPlayer(&buf[next_out], oldi - next_out);
                    next_out = leftover_start = i;
                    started = STARTED_CHATTER;
                    suppressKibitz = TRUE;
                    continue;
                }
                if((gameMode == IcsIdle || gameMode == BeginningOfGame)
                        && looking_at(buf, &i, "* ads displayed")) {
                    soughtPending = FALSE;
                    seekGraphUp = TRUE;
                    DrawSeekGraph();
                    continue;
                }
                if(appData.autoRefresh) {
                    if(looking_at(buf, &i, "* (*) seeking * * * * *\"play *\" to respond)\n")) {
                        int s = (ics_type == ICS_ICC); // ICC format differs
                        if(seekGraphUp)
                        AddAd(star_match[0], star_match[1], atoi(star_match[2+s]), atoi(star_match[3+s]),
                              star_match[4+s][0], star_match[5-3*s], atoi(star_match[7]), TRUE);
                        looking_at(buf, &i, "*% "); // eat prompt
                        if(oldi > 0 && buf[oldi-1] == '\n') oldi--; // suppress preceding LF, if any
                        if (oldi > next_out) SendToPlayer(&buf[next_out], oldi - next_out);
                        next_out = i; // suppress
                        continue;
                    }
                    if(looking_at(buf, &i, "\nAds removed: *\n") || looking_at(buf, &i, "\031(51 * *\031)")) {
                        char *p = star_match[0];
                        while(*p) {
                            if(seekGraphUp) RemoveSeekAd(atoi(p));
                            while(*p && *p++ != ' '); // next
                        }
                        looking_at(buf, &i, "*% "); // eat prompt
                        if (oldi > next_out) SendToPlayer(&buf[next_out], oldi - next_out);
                        next_out = i;
                        continue;
                    }
                }
            }

            /* skip formula vars */
            if (started == STARTED_NONE &&
                buf[i] == 'f' && isdigit(buf[i+1]) && buf[i+2] == ':') {
              started = STARTED_CHATTER;
              i += 3;
              continue;
            }

            // [HGM] kibitz: try to recognize opponent engine-score kibitzes, to divert them to engine-output window
            if (appData.autoKibitz && started == STARTED_NONE &&
                !appData.icsEngineAnalyze &&                     // [HGM] [DM] ICS analyze
                (gameMode == IcsPlayingWhite || gameMode == IcsPlayingBlack || gameMode == IcsObserving)) {
                if((looking_at(buf, &i, "\n* kibitzes: ") || looking_at(buf, &i, "\n* whispers: ") ||
                    looking_at(buf, &i, "* kibitzes: ") || looking_at(buf, &i, "* whispers: ")) &&
                   (StrStr(star_match[0], gameInfo.white) == star_match[0] ||
                    StrStr(star_match[0], gameInfo.black) == star_match[0]   )) { // kibitz of self or opponent
                        suppressKibitz = TRUE;
                        if (oldi > next_out) SendToPlayer(&buf[next_out], oldi - next_out);
                        next_out = i;
                        if((StrStr(star_match[0], gameInfo.white) == star_match[0]
                                && (gameMode == IcsPlayingWhite)) ||
                           (StrStr(star_match[0], gameInfo.black) == star_match[0]
                                && (gameMode == IcsPlayingBlack))   ) // opponent kibitz
                            started = STARTED_CHATTER; // own kibitz we simply discard
                        else {
                            started = STARTED_COMMENT; // make sure it will be collected in parse[]
                            parse_pos = 0; parse[0] = NULLCHAR;
                            savingComment = TRUE;
                            suppressKibitz = gameMode != IcsObserving ? 2 :
                                (StrStr(star_match[0], gameInfo.white) == NULL) + 1;
                        }
                        continue;
                } else
                if((looking_at(buf, &i, "\nkibitzed to *\n") || looking_at(buf, &i, "kibitzed to *\n") ||
                    looking_at(buf, &i, "\n(kibitzed to *\n") || looking_at(buf, &i, "(kibitzed to *\n"))
                         && atoi(star_match[0])) {
                    // suppress the acknowledgements of our own autoKibitz
                    char *p;
                    if (oldi > next_out) SendToPlayer(&buf[next_out], oldi - next_out);
                    if(p = strchr(star_match[0], ' ')) p[1] = NULLCHAR; // clip off "players)" on FICS
                    SendToPlayer(star_match[0], strlen(star_match[0]));
                    if(looking_at(buf, &i, "*% ")) // eat prompt
                        suppressKibitz = FALSE;
                    next_out = i;
                    continue;
                }
            } // [HGM] kibitz: end of patch

            if(looking_at(buf, &i, "* rating adjustment: * --> *\n")) continue;

            // [HGM] chat: intercept tells by users for which we have an open chat window
            channel = -1;
            if(started == STARTED_NONE && (looking_at(buf, &i, "* tells you:") || looking_at(buf, &i, "* says:") ||
                                           looking_at(buf, &i, "* whispers:") ||
                                           looking_at(buf, &i, "* kibitzes:") ||
                                           looking_at(buf, &i, "* shouts:") ||
                                           looking_at(buf, &i, "* c-shouts:") ||
                                           looking_at(buf, &i, "--> * ") ||
                                           looking_at(buf, &i, "*(*):") && (sscanf(star_match[1], "%d", &channel),1) ||
                                           looking_at(buf, &i, "*(*)(*):") && (sscanf(star_match[2], "%d", &channel),1) ||
                                           looking_at(buf, &i, "*(*)(*)(*):") && (sscanf(star_match[3], "%d", &channel),1) ||
                                           looking_at(buf, &i, "*(*)(*)(*)(*):") && sscanf(star_match[4], "%d", &channel) == 1 )) {
                int p;
                sscanf(star_match[0], "%[^(]", talker+1); // strip (C) or (U) off ICS handle
                chattingPartner = -1;

                if(channel >= 0) // channel broadcast; look if there is a chatbox for this channel
                for(p=0; p<MAX_CHAT; p++) {
                    if(chatPartner[p][0] >= '0' && chatPartner[p][0] <= '9' && channel == atoi(chatPartner[p])) {
                    talker[0] = '['; strcat(talker, "] ");
                    Colorize(channel == 1 ? ColorChannel1 : ColorChannel, FALSE);
                    chattingPartner = p; break;
                    }
                } else
                if(buf[i-3] == 'e') // kibitz; look if there is a KIBITZ chatbox
                for(p=0; p<MAX_CHAT; p++) {
                    if(!strcmp("kibitzes", chatPartner[p])) {
                        talker[0] = '['; strcat(talker, "] ");
                        chattingPartner = p; break;
                    }
                } else
                if(buf[i-3] == 'r') // whisper; look if there is a WHISPER chatbox
                for(p=0; p<MAX_CHAT; p++) {
                    if(!strcmp("whispers", chatPartner[p])) {
                        talker[0] = '['; strcat(talker, "] ");
                        chattingPartner = p; break;
                    }
                } else
                if(buf[i-3] == 't' || buf[oldi+2] == '>') {// shout, c-shout or it; look if there is a 'shouts' chatbox
                  if(buf[i-8] == '-' && buf[i-3] == 't')
                  for(p=0; p<MAX_CHAT; p++) { // c-shout; check if dedicatesd c-shout box exists
                    if(!strcmp("c-shouts", chatPartner[p])) {
                        talker[0] = '('; strcat(talker, ") "); Colorize(ColorSShout, FALSE);
                        chattingPartner = p; break;
                    }
                  }
                  if(chattingPartner < 0)
                  for(p=0; p<MAX_CHAT; p++) {
                    if(!strcmp("shouts", chatPartner[p])) {
                        if(buf[oldi+2] == '>') { talker[0] = '<'; strcat(talker, "> "); Colorize(ColorShout, FALSE); }
                        else if(buf[i-8] == '-') { talker[0] = '('; strcat(talker, ") "); Colorize(ColorSShout, FALSE); }
                        else { talker[0] = '['; strcat(talker, "] "); Colorize(ColorShout, FALSE); }
                        chattingPartner = p; break;
                    }
                  }
                }
                if(chattingPartner<0) // if not, look if there is a chatbox for this indivdual
                for(p=0; p<MAX_CHAT; p++) if(!StrCaseCmp(talker+1, chatPartner[p])) {
                    talker[0] = 0; Colorize(ColorTell, FALSE);
                    chattingPartner = p; break;
                }
                if(chattingPartner<0) i = oldi; else {
                    Colorize(curColor, TRUE); // undo the bogus colorations we just made to trigger the souds
                    if(oldi > 0 && buf[oldi-1] == '\n') oldi--;
                    if (oldi > next_out) SendToPlayer(&buf[next_out], oldi - next_out);
                    started = STARTED_COMMENT;
                    parse_pos = 0; parse[0] = NULLCHAR;
                    savingComment = 3 + chattingPartner; // counts as TRUE
                    suppressKibitz = TRUE;
                    continue;
                }
            } // [HGM] chat: end of patch

          backup = i;
            if (appData.zippyTalk || appData.zippyPlay) {
                /* [DM] Backup address for color zippy lines */
#if ZIPPY
               if (loggedOn == TRUE)
                       if (ZippyControl(buf, &backup) || ZippyConverse(buf, &backup) ||
                          (appData.zippyPlay && ZippyMatch(buf, &backup)));
#endif
            } // [DM] 'else { ' deleted
                if (
                    /* Regular tells and says */
                    (tkind = 1, looking_at(buf, &i, "* tells you: ")) ||
                    looking_at(buf, &i, "* (your partner) tells you: ") ||
                    looking_at(buf, &i, "* says: ") ||
                    /* Don't color "message" or "messages" output */
                    (tkind = 5, looking_at(buf, &i, "*. * (*:*): ")) ||
                    looking_at(buf, &i, "*. * at *:*: ") ||
                    looking_at(buf, &i, "--* (*:*): ") ||
                    /* Message notifications (same color as tells) */
                    looking_at(buf, &i, "* has left a message ") ||
                    looking_at(buf, &i, "* just sent you a message:\n") ||
                    /* Whispers and kibitzes */
                    (tkind = 2, looking_at(buf, &i, "* whispers: ")) ||
                    looking_at(buf, &i, "* kibitzes: ") ||
                    /* Channel tells */
                    (tkind = 3, looking_at(buf, &i, "*(*: "))) {

                  if (tkind == 1 && strchr(star_match[0], ':')) {
                      /* Avoid "tells you:" spoofs in channels */
                     tkind = 3;
                  }
                  if (star_match[0][0] == NULLCHAR ||
                      strchr(star_match[0], ' ') ||
                      (tkind == 3 && strchr(star_match[1], ' '))) {
                    /* Reject bogus matches */
                    i = oldi;
                  } else {
                    if (appData.colorize) {
                      if (oldi > next_out) {
                        SendToPlayer(&buf[next_out], oldi - next_out);
                        next_out = oldi;
                      }
                      switch (tkind) {
                      case 1:
                        Colorize(ColorTell, FALSE);
                        curColor = ColorTell;
                        break;
                      case 2:
                        Colorize(ColorKibitz, FALSE);
                        curColor = ColorKibitz;
                        break;
                      case 3:
                        p = strrchr(star_match[1], '(');
                        if (p == NULL) {
                          p = star_match[1];
                        } else {
                          p++;
                        }
                        if (atoi(p) == 1) {
                          Colorize(ColorChannel1, FALSE);
                          curColor = ColorChannel1;
                        } else {
                          Colorize(ColorChannel, FALSE);
                          curColor = ColorChannel;
                        }
                        break;
                      case 5:
                        curColor = ColorNormal;
                        break;
                      }
                    }
                    if (started == STARTED_NONE && appData.autoComment &&
                        (gameMode == IcsObserving ||
                         gameMode == IcsPlayingWhite ||
                         gameMode == IcsPlayingBlack)) {
                      parse_pos = i - oldi;
                      memcpy(parse, &buf[oldi], parse_pos);
                      parse[parse_pos] = NULLCHAR;
                      started = STARTED_COMMENT;
                      savingComment = TRUE;
                    } else {
                      started = STARTED_CHATTER;
                      savingComment = FALSE;
                    }
                    loggedOn = TRUE;
                    continue;
                  }
                }

                if (looking_at(buf, &i, "* s-shouts: ") ||
                    looking_at(buf, &i, "* c-shouts: ")) {
                    if (appData.colorize) {
                        if (oldi > next_out) {
                            SendToPlayer(&buf[next_out], oldi - next_out);
                            next_out = oldi;
                        }
                        Colorize(ColorSShout, FALSE);
                        curColor = ColorSShout;
                    }
                    loggedOn = TRUE;
                    started = STARTED_CHATTER;
                    continue;
                }

                if (looking_at(buf, &i, "--->")) {
                    loggedOn = TRUE;
                    continue;
                }

                if (looking_at(buf, &i, "* shouts: ") ||
                    looking_at(buf, &i, "--> ")) {
                    if (appData.colorize) {
                        if (oldi > next_out) {
                            SendToPlayer(&buf[next_out], oldi - next_out);
                            next_out = oldi;
                        }
                        Colorize(ColorShout, FALSE);
                        curColor = ColorShout;
                    }
                    loggedOn = TRUE;
                    started = STARTED_CHATTER;
                    continue;
                }

                if (looking_at( buf, &i, "Challenge:")) {
                    if (appData.colorize) {
                        if (oldi > next_out) {
                            SendToPlayer(&buf[next_out], oldi - next_out);
                            next_out = oldi;
                        }
                        Colorize(ColorChallenge, FALSE);
                        curColor = ColorChallenge;
                    }
                    loggedOn = TRUE;
                    continue;
                }

                if (looking_at(buf, &i, "* offers you") ||
                    looking_at(buf, &i, "* offers to be") ||
                    looking_at(buf, &i, "* would like to") ||
                    looking_at(buf, &i, "* requests to") ||
                    looking_at(buf, &i, "Your opponent offers") ||
                    looking_at(buf, &i, "Your opponent requests")) {

                    if (appData.colorize) {
                        if (oldi > next_out) {
                            SendToPlayer(&buf[next_out], oldi - next_out);
                            next_out = oldi;
                        }
                        Colorize(ColorRequest, FALSE);
                        curColor = ColorRequest;
                    }
                    continue;
                }

                if (looking_at(buf, &i, "* (*) seeking")) {
                    if (appData.colorize) {
                        if (oldi > next_out) {
                            SendToPlayer(&buf[next_out], oldi - next_out);
                            next_out = oldi;
                        }
                        Colorize(ColorSeek, FALSE);
                        curColor = ColorSeek;
                    }
                    continue;
            }

          if(i < backup) { i = backup; continue; } // [HGM] for if ZippyControl matches, but the colorie code doesn't

            if (looking_at(buf, &i, "\\   ")) {
                if (prevColor != ColorNormal) {
                    if (oldi > next_out) {
                        SendToPlayer(&buf[next_out], oldi - next_out);
                        next_out = oldi;
                    }
                    Colorize(prevColor, TRUE);
                    curColor = prevColor;
                }
                if (savingComment) {
                    parse_pos = i - oldi;
                    memcpy(parse, &buf[oldi], parse_pos);
                    parse[parse_pos] = NULLCHAR;
                    started = STARTED_COMMENT;
                    if(savingComment >= 3) // [HGM] chat: continuation of line for chat box
                        chattingPartner = savingComment - 3; // kludge to remember the box
                } else {
                    started = STARTED_CHATTER;
                }
                continue;
            }

            if (looking_at(buf, &i, "Black Strength :") ||
                looking_at(buf, &i, "<<< style 10 board >>>") ||
                looking_at(buf, &i, "<10>") ||
                looking_at(buf, &i, "#@#")) {
                /* Wrong board style */
                loggedOn = TRUE;
                SendToICS(ics_prefix);
                SendToICS("set style 12\n");
                SendToICS(ics_prefix);
                SendToICS("refresh\n");
                continue;
            }

            if (!have_sent_ICS_logon && looking_at(buf, &i, "login:")) {
                ICSInitScript();
                have_sent_ICS_logon = 1;
                continue;
            }

            if (ics_getting_history != H_GETTING_MOVES /*smpos kludge*/ &&
                (looking_at(buf, &i, "\n<12> ") ||
                 looking_at(buf, &i, "<12> "))) {
                loggedOn = TRUE;
                if (oldi > next_out) {
                    SendToPlayer(&buf[next_out], oldi - next_out);
                }
                next_out = i;
                started = STARTED_BOARD;
                parse_pos = 0;
                continue;
            }

            if ((started == STARTED_NONE && looking_at(buf, &i, "\n<b1> ")) ||
                looking_at(buf, &i, "<b1> ")) {
                if (oldi > next_out) {
                    SendToPlayer(&buf[next_out], oldi - next_out);
                }
                next_out = i;
                started = STARTED_HOLDINGS;
                parse_pos = 0;
                continue;
            }

            if (looking_at(buf, &i, "* *vs. * *--- *")) {
                loggedOn = TRUE;
                /* Header for a move list -- first line */

                switch (ics_getting_history) {
                  case H_FALSE:
                    switch (gameMode) {
                      case IcsIdle:
                      case BeginningOfGame:
                        /* User typed "moves" or "oldmoves" while we
                           were idle.  Pretend we asked for these
                           moves and soak them up so user can step
                           through them and/or save them.
                           */
                        Reset(FALSE, TRUE);
                        gameMode = IcsObserving;
                        ModeHighlight();
                        ics_gamenum = -1;
                        ics_getting_history = H_GOT_UNREQ_HEADER;
                        break;
                      case EditGame: /*?*/
                      case EditPosition: /*?*/
                        /* Should above feature work in these modes too? */
                        /* For now it doesn't */
                        ics_getting_history = H_GOT_UNWANTED_HEADER;
                        break;
                      default:
                        ics_getting_history = H_GOT_UNWANTED_HEADER;
                        break;
                    }
                    break;
                  case H_REQUESTED:
                    /* Is this the right one? */
                    if (gameInfo.white && gameInfo.black &&
                        strcmp(gameInfo.white, star_match[0]) == 0 &&
                        strcmp(gameInfo.black, star_match[2]) == 0) {
                        /* All is well */
                        ics_getting_history = H_GOT_REQ_HEADER;
                    }
                    break;
                  case H_GOT_REQ_HEADER:
                  case H_GOT_UNREQ_HEADER:
                  case H_GOT_UNWANTED_HEADER:
                  case H_GETTING_MOVES:
                    /* Should not happen */
                    DisplayError(_("Error gathering move list: two headers"), 0);
                    ics_getting_history = H_FALSE;
                    break;
                }

                /* Save player ratings into gameInfo if needed */
                if ((ics_getting_history == H_GOT_REQ_HEADER ||
                     ics_getting_history == H_GOT_UNREQ_HEADER) &&
                    (gameInfo.whiteRating == -1 ||
                     gameInfo.blackRating == -1)) {

                    gameInfo.whiteRating = string_to_rating(star_match[1]);
                    gameInfo.blackRating = string_to_rating(star_match[3]);
                    if (appData.debugMode)
                      fprintf(debugFP, _("Ratings from header: W %d, B %d\n"),
                              gameInfo.whiteRating, gameInfo.blackRating);
                }
                continue;
            }

            if (looking_at(buf, &i,
              "* * match, initial time: * minute*, increment: * second")) {
                /* Header for a move list -- second line */
                /* Initial board will follow if this is a wild game */
                if (gameInfo.event != NULL) free(gameInfo.event);
                snprintf(str, MSG_SIZ, "ICS %s %s match", star_match[0], star_match[1]);
                gameInfo.event = StrSave(str);
                /* [HGM] we switched variant. Translate boards if needed. */
                VariantSwitch(boards[currentMove], StringToVariant(gameInfo.event));
                continue;
            }

            if (looking_at(buf, &i, "Move  ")) {
                /* Beginning of a move list */
                switch (ics_getting_history) {
                  case H_FALSE:
                    /* Normally should not happen */
                    /* Maybe user hit reset while we were parsing */
                    break;
                  case H_REQUESTED:
                    /* Happens if we are ignoring a move list that is not
                     * the one we just requested.  Common if the user
                     * tries to observe two games without turning off
                     * getMoveList */
                    break;
                  case H_GETTING_MOVES:
                    /* Should not happen */
                    DisplayError(_("Error gathering move list: nested"), 0);
                    ics_getting_history = H_FALSE;
                    break;
                  case H_GOT_REQ_HEADER:
                    ics_getting_history = H_GETTING_MOVES;
                    started = STARTED_MOVES;
                    parse_pos = 0;
                    if (oldi > next_out) {
                        SendToPlayer(&buf[next_out], oldi - next_out);
                    }
                    break;
                  case H_GOT_UNREQ_HEADER:
                    ics_getting_history = H_GETTING_MOVES;
                    started = STARTED_MOVES_NOHIDE;
                    parse_pos = 0;
                    break;
                  case H_GOT_UNWANTED_HEADER:
                    ics_getting_history = H_FALSE;
                    break;
                }
                continue;
            }

            if (looking_at(buf, &i, "% ") ||
                ((started == STARTED_MOVES || started == STARTED_MOVES_NOHIDE)
                 && looking_at(buf, &i, "}*"))) { char *bookHit = NULL; // [HGM] book
                if(soughtPending) { // [HGM] seekgraph: on ICC sought-list has no termination line
                    soughtPending = FALSE;
                    seekGraphUp = TRUE;
                    DrawSeekGraph();
                }
                if(suppressKibitz) next_out = i;
                savingComment = FALSE;
                suppressKibitz = 0;
                switch (started) {
                  case STARTED_MOVES:
                  case STARTED_MOVES_NOHIDE:
                    memcpy(&parse[parse_pos], &buf[oldi], i - oldi);
                    parse[parse_pos + i - oldi] = NULLCHAR;
                    ParseGameHistory(parse);
#if ZIPPY
                    if (appData.zippyPlay && first.initDone) {
                        FeedMovesToProgram(&first, forwardMostMove);
                        if (gameMode == IcsPlayingWhite) {
                            if (WhiteOnMove(forwardMostMove)) {
                                if (first.sendTime) {
                                  if (first.useColors) {
                                    SendToProgram("black\n", &first);
                                  }
                                  SendTimeRemaining(&first, TRUE);
                                }
                                if (first.useColors) {
                                  SendToProgram("white\n", &first); // [HGM] book: made sending of "go\n" book dependent
                                }
                                bookHit = SendMoveToBookUser(forwardMostMove-1, &first, TRUE); // [HGM] book: probe book for initial pos
                                first.maybeThinking = TRUE;
                            } else {
                                if (first.usePlayother) {
                                  if (first.sendTime) {
                                    SendTimeRemaining(&first, TRUE);
                                  }
                                  SendToProgram("playother\n", &first);
                                  firstMove = FALSE;
                                } else {
                                  firstMove = TRUE;
                                }
                            }
                        } else if (gameMode == IcsPlayingBlack) {
                            if (!WhiteOnMove(forwardMostMove)) {
                                if (first.sendTime) {
                                  if (first.useColors) {
                                    SendToProgram("white\n", &first);
                                  }
                                  SendTimeRemaining(&first, FALSE);
                                }
                                if (first.useColors) {
                                  SendToProgram("black\n", &first);
                                }
                                bookHit = SendMoveToBookUser(forwardMostMove-1, &first, TRUE);
                                first.maybeThinking = TRUE;
                            } else {
                                if (first.usePlayother) {
                                  if (first.sendTime) {
                                    SendTimeRemaining(&first, FALSE);
                                  }
                                  SendToProgram("playother\n", &first);
                                  firstMove = FALSE;
                                } else {
                                  firstMove = TRUE;
                                }
                            }
                        }
                    }
#endif
                    if (gameMode == IcsObserving && ics_gamenum == -1) {
                        /* Moves came from oldmoves or moves command
                           while we weren't doing anything else.
                           */
                        currentMove = forwardMostMove;
                        ClearHighlights();/*!!could figure this out*/
                        flipView = appData.flipView;
                        DrawPosition(TRUE, boards[currentMove]);
                        DisplayBothClocks();
                        snprintf(str, MSG_SIZ, "%s %s %s",
                                gameInfo.white, _("vs."),  gameInfo.black);
                        DisplayTitle(str);
                        gameMode = IcsIdle;
                    } else {
                        /* Moves were history of an active game */
                        if (gameInfo.resultDetails != NULL) {
                            free(gameInfo.resultDetails);
                            gameInfo.resultDetails = NULL;
                        }
                    }
                    HistorySet(parseList, backwardMostMove,
                               forwardMostMove, currentMove-1);
                    DisplayMove(currentMove - 1);
                    if (started == STARTED_MOVES) next_out = i;
                    started = STARTED_NONE;
                    ics_getting_history = H_FALSE;
                    break;

                  case STARTED_OBSERVE:
                    started = STARTED_NONE;
                    SendToICS(ics_prefix);
                    SendToICS("refresh\n");
                    break;

                  default:
                    break;
                }
                if(bookHit) { // [HGM] book: simulate book reply
                    static char bookMove[MSG_SIZ]; // a bit generous?

                    programStats.nodes = programStats.depth = programStats.time =
                    programStats.score = programStats.got_only_move = 0;
                    sprintf(programStats.movelist, "%s (xbook)", bookHit);

                    safeStrCpy(bookMove, "move ", sizeof(bookMove)/sizeof(bookMove[0]));
                    strcat(bookMove, bookHit);
                    HandleMachineMove(bookMove, &first);
                }
                continue;
            }

            if ((started == STARTED_MOVES || started == STARTED_BOARD ||
                 started == STARTED_HOLDINGS ||
                 started == STARTED_MOVES_NOHIDE) && i >= leftover_len) {
                /* Accumulate characters in move list or board */
                parse[parse_pos++] = buf[i];
            }

            /* Start of game messages.  Mostly we detect start of game
               when the first board image arrives.  On some versions
               of the ICS, though, we need to do a "refresh" after starting
               to observe in order to get the current board right away. */
            if (looking_at(buf, &i, "Adding game * to observation list")) {
                started = STARTED_OBSERVE;
                continue;
            }

            /* Handle auto-observe */
            if (appData.autoObserve &&
                (gameMode == IcsIdle || gameMode == BeginningOfGame) &&
                looking_at(buf, &i, "Game notification: * (*) vs. * (*)")) {
                char *player;
                /* Choose the player that was highlighted, if any. */
                if (star_match[0][0] == '\033' ||
                    star_match[1][0] != '\033') {
                    player = star_match[0];
                } else {
                    player = star_match[2];
                }
                snprintf(str, MSG_SIZ, "%sobserve %s\n",
                        ics_prefix, StripHighlightAndTitle(player));
                SendToICS(str);

                /* Save ratings from notify string */
                safeStrCpy(player1Name, star_match[0], sizeof(player1Name)/sizeof(player1Name[0]));
                player1Rating = string_to_rating(star_match[1]);
                safeStrCpy(player2Name, star_match[2], sizeof(player2Name)/sizeof(player2Name[0]));
                player2Rating = string_to_rating(star_match[3]);

                if (appData.debugMode)
                  fprintf(debugFP,
                          "Ratings from 'Game notification:' %s %d, %s %d\n",
                          player1Name, player1Rating,
                          player2Name, player2Rating);

                continue;
            }

            /* Deal with automatic examine mode after a game,
               and with IcsObserving -> IcsExamining transition */
            if (looking_at(buf, &i, "Entering examine mode for game *") ||
                looking_at(buf, &i, "has made you an examiner of game *")) {

                int gamenum = atoi(star_match[0]);
                if ((gameMode == IcsIdle || gameMode == IcsObserving) &&
                    gamenum == ics_gamenum) {
                    /* We were already playing or observing this game;
                       no need to refetch history */
                    gameMode = IcsExamining;
                    if (pausing) {
                        pauseExamForwardMostMove = forwardMostMove;
                    } else if (currentMove < forwardMostMove) {
                        ForwardInner(forwardMostMove);
                    }
                } else {
                    /* I don't think this case really can happen */
                    SendToICS(ics_prefix);
                    SendToICS("refresh\n");
                }
                continue;
            }

            /* Error messages */
//          if (ics_user_moved) {
            if (1) { // [HGM] old way ignored error after move type in; ics_user_moved is not set then!
                if (looking_at(buf, &i, "Illegal move") ||
                    looking_at(buf, &i, "Not a legal move") ||
                    looking_at(buf, &i, "Your king is in check") ||
                    looking_at(buf, &i, "It isn't your turn") ||
                    looking_at(buf, &i, "It is not your move")) {
                    /* Illegal move */
                    if (ics_user_moved && forwardMostMove > backwardMostMove) { // only backup if we already moved
                        currentMove = forwardMostMove-1;
                        DisplayMove(currentMove - 1); /* before DMError */
                        DrawPosition(FALSE, boards[currentMove]);
                        SwitchClocks(forwardMostMove-1); // [HGM] race
                        DisplayBothClocks();
                    }
                    DisplayMoveError(_("Illegal move (rejected by ICS)")); // [HGM] but always relay error msg
                    ics_user_moved = 0;
                    continue;
                }
            }

            if (looking_at(buf, &i, "still have time") ||
                looking_at(buf, &i, "not out of time") ||
                looking_at(buf, &i, "either player is out of time") ||
                looking_at(buf, &i, "has timeseal; checking")) {
                /* We must have called his flag a little too soon */
                whiteFlag = blackFlag = FALSE;
                continue;
            }

            if (looking_at(buf, &i, "added * seconds to") ||
                looking_at(buf, &i, "seconds were added to")) {
                /* Update the clocks */
                SendToICS(ics_prefix);
                SendToICS("refresh\n");
                continue;
            }

            if (!ics_clock_paused && looking_at(buf, &i, "clock paused")) {
                ics_clock_paused = TRUE;
                StopClocks();
                continue;
            }

            if (ics_clock_paused && looking_at(buf, &i, "clock resumed")) {
                ics_clock_paused = FALSE;
                StartClocks();
                continue;
            }

            /* Grab player ratings from the Creating: message.
               Note we have to check for the special case when
               the ICS inserts things like [white] or [black]. */
            if (looking_at(buf, &i, "Creating: * (*)* * (*)") ||
                looking_at(buf, &i, "Creating: * (*) [*] * (*)")) {
                /* star_matches:
                   0    player 1 name (not necessarily white)
                   1    player 1 rating
                   2    empty, white, or black (IGNORED)
                   3    player 2 name (not necessarily black)
                   4    player 2 rating

                   The names/ratings are sorted out when the game
                   actually starts (below).
                */
                safeStrCpy(player1Name, StripHighlightAndTitle(star_match[0]), sizeof(player1Name)/sizeof(player1Name[0]));
                player1Rating = string_to_rating(star_match[1]);
                safeStrCpy(player2Name, StripHighlightAndTitle(star_match[3]), sizeof(player2Name)/sizeof(player2Name[0]));
                player2Rating = string_to_rating(star_match[4]);

                if (appData.debugMode)
                  fprintf(debugFP,
                          "Ratings from 'Creating:' %s %d, %s %d\n",
                          player1Name, player1Rating,
                          player2Name, player2Rating);

                continue;
            }

            /* Improved generic start/end-of-game messages */
            if ((tkind=0, looking_at(buf, &i, "{Game * (* vs. *) *}*")) ||
                (tkind=1, looking_at(buf, &i, "{Game * (*(*) vs. *(*)) *}*"))){
                /* If tkind == 0: */
                /* star_match[0] is the game number */
                /*           [1] is the white player's name */
                /*           [2] is the black player's name */
                /* For end-of-game: */
                /*           [3] is the reason for the game end */
                /*           [4] is a PGN end game-token, preceded by " " */
                /* For start-of-game: */
                /*           [3] begins with "Creating" or "Continuing" */
                /*           [4] is " *" or empty (don't care). */
                int gamenum = atoi(star_match[0]);
                char *whitename, *blackname, *why, *endtoken;
                ChessMove endtype = EndOfFile;

                if (tkind == 0) {
                  whitename = star_match[1];
                  blackname = star_match[2];
                  why = star_match[3];
                  endtoken = star_match[4];
                } else {
                  whitename = star_match[1];
                  blackname = star_match[3];
                  why = star_match[5];
                  endtoken = star_match[6];
                }

                /* Game start messages */
                if (strncmp(why, "Creating ", 9) == 0 ||
                    strncmp(why, "Continuing ", 11) == 0) {
                    gs_gamenum = gamenum;
                    safeStrCpy(gs_kind, strchr(why, ' ') + 1,sizeof(gs_kind)/sizeof(gs_kind[0]));
                    if(ics_gamenum == -1) // [HGM] only if we are not already involved in a game (because gin=1 sends us such messages)
                    VariantSwitch(boards[currentMove], StringToVariant(gs_kind)); // [HGM] variantswitch: even before we get first board
#if ZIPPY
                    if (appData.zippyPlay) {
                        ZippyGameStart(whitename, blackname);
                    }
#endif /*ZIPPY*/
                    partnerBoardValid = FALSE; // [HGM] bughouse
                    continue;
                }

                /* Game end messages */
                if (gameMode == IcsIdle || gameMode == BeginningOfGame ||
                    ics_gamenum != gamenum) {
                    continue;
                }
                while (endtoken[0] == ' ') endtoken++;
                switch (endtoken[0]) {
                  case '*':
                  default:
                    endtype = GameUnfinished;
                    break;
                  case '0':
                    endtype = BlackWins;
                    break;
                  case '1':
                    if (endtoken[1] == '/')
                      endtype = GameIsDrawn;
                    else
                      endtype = WhiteWins;
                    break;
                }
                GameEnds(endtype, why, GE_ICS);
#if ZIPPY
                if (appData.zippyPlay && first.initDone) {
                    ZippyGameEnd(endtype, why);
                    if (first.pr == NoProc) {
                      /* Start the next process early so that we'll
                         be ready for the next challenge */
                      StartChessProgram(&first);
                    }
                    /* Send "new" early, in case this command takes
                       a long time to finish, so that we'll be ready
                       for the next challenge. */
                    gameInfo.variant = VariantNormal; // [HGM] variantswitch: suppress sending of 'variant'
                    Reset(TRUE, TRUE);
                }
#endif /*ZIPPY*/
                if(appData.bgObserve && partnerBoardValid) DrawPosition(TRUE, partnerBoard);
                continue;
            }

            if (looking_at(buf, &i, "Removing game * from observation") ||
                looking_at(buf, &i, "no longer observing game *") ||
                looking_at(buf, &i, "Game * (*) has no examiners")) {
                if (gameMode == IcsObserving &&
                    atoi(star_match[0]) == ics_gamenum)
                  {
                      /* icsEngineAnalyze */
                      if (appData.icsEngineAnalyze) {
                            ExitAnalyzeMode();
                            ModeHighlight();
                      }
                      StopClocks();
                      gameMode = IcsIdle;
                      ics_gamenum = -1;
                      ics_user_moved = FALSE;
                  }
                continue;
            }

            if (looking_at(buf, &i, "no longer examining game *")) {
                if (gameMode == IcsExamining &&
                    atoi(star_match[0]) == ics_gamenum)
                  {
                      gameMode = IcsIdle;
                      ics_gamenum = -1;
                      ics_user_moved = FALSE;
                  }
                continue;
            }

            /* Advance leftover_start past any newlines we find,
               so only partial lines can get reparsed */
            if (looking_at(buf, &i, "\n")) {
                prevColor = curColor;
                if (curColor != ColorNormal) {
                    if (oldi > next_out) {
                        SendToPlayer(&buf[next_out], oldi - next_out);
                        next_out = oldi;
                    }
                    Colorize(ColorNormal, FALSE);
                    curColor = ColorNormal;
                }
                if (started == STARTED_BOARD) {
                    started = STARTED_NONE;
                    parse[parse_pos] = NULLCHAR;
                    ParseBoard12(parse);
                    ics_user_moved = 0;

                    /* Send premove here */
                    if (appData.premove) {
                      char str[MSG_SIZ];
                      if (currentMove == 0 &&
                          gameMode == IcsPlayingWhite &&
                          appData.premoveWhite) {
                        snprintf(str, MSG_SIZ, "%s\n", appData.premoveWhiteText);
                        if (appData.debugMode)
                          fprintf(debugFP, "Sending premove:\n");
                        SendToICS(str);
                      } else if (currentMove == 1 &&
                                 gameMode == IcsPlayingBlack &&
                                 appData.premoveBlack) {
                        snprintf(str, MSG_SIZ, "%s\n", appData.premoveBlackText);
                        if (appData.debugMode)
                          fprintf(debugFP, "Sending premove:\n");
                        SendToICS(str);
                      } else if (gotPremove) {
                        gotPremove = 0;
                        ClearPremoveHighlights();
                        if (appData.debugMode)
                          fprintf(debugFP, "Sending premove:\n");
                          UserMoveEvent(premoveFromX, premoveFromY,
                                        premoveToX, premoveToY,
                                        premovePromoChar);
                      }
                    }

                    /* Usually suppress following prompt */
                    if (!(forwardMostMove == 0 && gameMode == IcsExamining)) {
                        while(looking_at(buf, &i, "\n")); // [HGM] skip empty lines
                        if (looking_at(buf, &i, "*% ")) {
                            savingComment = FALSE;
                            suppressKibitz = 0;
                        }
                    }
                    next_out = i;
                } else if (started == STARTED_HOLDINGS) {
                    int gamenum;
                    char new_piece[MSG_SIZ];
                    started = STARTED_NONE;
                    parse[parse_pos] = NULLCHAR;
                    if (appData.debugMode)
                      fprintf(debugFP, "Parsing holdings: %s, currentMove = %d\n",
                                                        parse, currentMove);
                    if (sscanf(parse, " game %d", &gamenum) == 1) {
                      if(gamenum == ics_gamenum) { // [HGM] bughouse: old code if part of foreground game
                        if (gameInfo.variant == VariantNormal) {
                          /* [HGM] We seem to switch variant during a game!
                           * Presumably no holdings were displayed, so we have
                           * to move the position two files to the right to
                           * create room for them!
                           */
                          VariantClass newVariant;
                          switch(gameInfo.boardWidth) { // base guess on board width
                                case 9:  newVariant = VariantShogi; break;
                                case 10: newVariant = VariantGreat; break;
                                default: newVariant = VariantCrazyhouse; break;
                          }
                          VariantSwitch(boards[currentMove], newVariant); /* temp guess */
                          /* Get a move list just to see the header, which
                             will tell us whether this is really bug or zh */
                          if (ics_getting_history == H_FALSE) {
                            ics_getting_history = H_REQUESTED;
                            snprintf(str, MSG_SIZ, "%smoves %d\n", ics_prefix, gamenum);
                            SendToICS(str);
                          }
                        }
                        new_piece[0] = NULLCHAR;
                        sscanf(parse, "game %d white [%s black [%s <- %s",
                               &gamenum, white_holding, black_holding,
                               new_piece);
                        white_holding[strlen(white_holding)-1] = NULLCHAR;
                        black_holding[strlen(black_holding)-1] = NULLCHAR;
                        /* [HGM] copy holdings to board holdings area */
                        CopyHoldings(boards[forwardMostMove], white_holding, WhitePawn);
                        CopyHoldings(boards[forwardMostMove], black_holding, BlackPawn);
                        boards[forwardMostMove][HOLDINGS_SET] = 1; // flag holdings as set
#if ZIPPY
                        if (appData.zippyPlay && first.initDone) {
                            ZippyHoldings(white_holding, black_holding,
                                          new_piece);
                        }
#endif /*ZIPPY*/
                        if (tinyLayout || smallLayout) {
                            char wh[16], bh[16];
                            PackHolding(wh, white_holding);
                            PackHolding(bh, black_holding);
                            snprintf(str, MSG_SIZ, "[%s-%s] %s-%s", wh, bh,
                                    gameInfo.white, gameInfo.black);
                        } else {
                          snprintf(str, MSG_SIZ, "%s [%s] %s %s [%s]",
                                    gameInfo.white, white_holding, _("vs."),
                                    gameInfo.black, black_holding);
                        }
                        if(!partnerUp) // [HGM] bughouse: when peeking at partner game we already know what he captured...
                        DrawPosition(FALSE, boards[currentMove]);
                        DisplayTitle(str);
                      } else if(appData.bgObserve) { // [HGM] bughouse: holdings of other game => background
                        sscanf(parse, "game %d white [%s black [%s <- %s",
                               &gamenum, white_holding, black_holding,
                               new_piece);
                        white_holding[strlen(white_holding)-1] = NULLCHAR;
                        black_holding[strlen(black_holding)-1] = NULLCHAR;
                        /* [HGM] copy holdings to partner-board holdings area */
                        CopyHoldings(partnerBoard, white_holding, WhitePawn);
                        CopyHoldings(partnerBoard, black_holding, BlackPawn);
                        if(twoBoards) { partnerUp = 1; flipView = !flipView; } // [HGM] dual: always draw
                        if(partnerUp) DrawPosition(FALSE, partnerBoard);
                        if(twoBoards) { partnerUp = 0; flipView = !flipView; }
                      }
                    }
                    /* Suppress following prompt */
                    if (looking_at(buf, &i, "*% ")) {
                        if(strchr(star_match[0], 7)) SendToPlayer("\007", 1); // Bell(); // FICS fuses bell for next board with prompt in zh captures
                        savingComment = FALSE;
                        suppressKibitz = 0;
                    }
                    next_out = i;
                }
                continue;
            }

            i++;                /* skip unparsed character and loop back */
        }

        if (started != STARTED_MOVES && started != STARTED_BOARD && !suppressKibitz && // [HGM] kibitz
//          started != STARTED_HOLDINGS && i > next_out) { // [HGM] should we compare to leftover_start in stead of i?
//          SendToPlayer(&buf[next_out], i - next_out);
            started != STARTED_HOLDINGS && leftover_start > next_out) {
            SendToPlayer(&buf[next_out], leftover_start - next_out);
            next_out = i;
        }

        leftover_len = buf_len - leftover_start;
        /* if buffer ends with something we couldn't parse,
           reparse it after appending the next read */

    } else if (count == 0) {
        RemoveInputSource(isr);
        DisplayFatalError(_("Connection closed by ICS"), 0, 0);
    } else {
        DisplayFatalError(_("Error reading from ICS"), error, 1);
    }
}


/* Board style 12 looks like this:

   <12> r-b---k- pp----pp ---bP--- ---p---- q------- ------P- P--Q--BP -----R-K W -1 0 0 0 0 0 0 paf MaxII 0 2 12 21 25 234 174 24 Q/d7-a4 (0:06) Qxa4 0 0

 * The "<12> " is stripped before it gets to this routine.  The two
 * trailing 0's (flip state and clock ticking) are later addition, and
 * some chess servers may not have them, or may have only the first.
 * Additional trailing fields may be added in the future.
 */

#define PATTERN "%c%d%d%d%d%d%d%d%s%s%d%d%d%d%d%d%d%d%s%s%s%d%d"

#define RELATION_OBSERVING_PLAYED    0
#define RELATION_OBSERVING_STATIC   -2   /* examined, oldmoves, or smoves */
#define RELATION_PLAYING_MYMOVE      1
#define RELATION_PLAYING_NOTMYMOVE  -1
#define RELATION_EXAMINING           2
#define RELATION_ISOLATED_BOARD     -3
#define RELATION_STARTING_POSITION  -4   /* FICS only */

void
ParseBoard12 (char *string)
{
    GameMode newGameMode;
    int gamenum, newGame, newMove, relation, basetime, increment, ics_flip = 0, i;
    int j, k, n, moveNum, white_stren, black_stren, white_time, black_time, takeback;
    int double_push, castle_ws, castle_wl, castle_bs, castle_bl, irrev_count;
    char to_play, board_chars[200];
    char move_str[MSG_SIZ], str[MSG_SIZ], elapsed_time[MSG_SIZ];
    char black[32], white[32];
    Board board;
    int prevMove = currentMove;
    int ticking = 2;
    ChessMove moveType;
    int fromX, fromY, toX, toY;
    char promoChar;
    int ranks=1, files=0; /* [HGM] ICS80: allow variable board size */
    char *bookHit = NULL; // [HGM] book
    Boolean weird = FALSE, reqFlag = FALSE;

    fromX = fromY = toX = toY = -1;

    newGame = FALSE;

    if (appData.debugMode)
      fprintf(debugFP, _("Parsing board: %s\n"), string);

    move_str[0] = NULLCHAR;
    elapsed_time[0] = NULLCHAR;
    {   /* [HGM] figure out how many ranks and files the board has, for ICS extension used by Capablanca server */
        int  i = 0, j;
        while(i < 199 && (string[i] != ' ' || string[i+2] != ' ')) {
            if(string[i] == ' ') { ranks++; files = 0; }
            else files++;
            if(!strchr(" -pnbrqkPNBRQK" , string[i])) weird = TRUE; // test for fairies
            i++;
        }
        for(j = 0; j <i; j++) board_chars[j] = string[j];
        board_chars[i] = '\0';
        string += i + 1;
    }
    n = sscanf(string, PATTERN, &to_play, &double_push,
               &castle_ws, &castle_wl, &castle_bs, &castle_bl, &irrev_count,
               &gamenum, white, black, &relation, &basetime, &increment,
               &white_stren, &black_stren, &white_time, &black_time,
               &moveNum, str, elapsed_time, move_str, &ics_flip,
               &ticking);

    if (n < 21) {
        snprintf(str, MSG_SIZ, _("Failed to parse board string:\n\"%s\""), string);
        DisplayError(str, 0);
        return;
    }

    /* Convert the move number to internal form */
    moveNum = (moveNum - 1) * 2;
    if (to_play == 'B') moveNum++;
    if (moveNum > framePtr) { // [HGM] vari: do not run into saved variations
      DisplayFatalError(_("Game too long; increase MAX_MOVES and recompile"),
                        0, 1);
      return;
    }

    switch (relation) {
      case RELATION_OBSERVING_PLAYED:
      case RELATION_OBSERVING_STATIC:
        if (gamenum == -1) {
            /* Old ICC buglet */
            relation = RELATION_OBSERVING_STATIC;
        }
        newGameMode = IcsObserving;
        break;
      case RELATION_PLAYING_MYMOVE:
      case RELATION_PLAYING_NOTMYMOVE:
        newGameMode =
          ((relation == RELATION_PLAYING_MYMOVE) == (to_play == 'W')) ?
            IcsPlayingWhite : IcsPlayingBlack;
        break;
      case RELATION_EXAMINING:
        newGameMode = IcsExamining;
        break;
      case RELATION_ISOLATED_BOARD:
      default:
        /* Just display this board.  If user was doing something else,
           we will forget about it until the next board comes. */
        newGameMode = IcsIdle;
        break;
      case RELATION_STARTING_POSITION:
        newGameMode = gameMode;
        break;
    }

    if((gameMode == IcsPlayingWhite || gameMode == IcsPlayingBlack)
         && newGameMode == IcsObserving && gamenum != ics_gamenum && appData.bgObserve) {
      // [HGM] bughouse: don't act on alien boards while we play. Just parse the board and save it */
      char *toSqr;
      for (k = 0; k < ranks; k++) {
        for (j = 0; j < files; j++)
          board[k][j+gameInfo.holdingsWidth] = CharToPiece(board_chars[(ranks-1-k)*(files+1) + j]);
        if(gameInfo.holdingsWidth > 1) {
             board[k][0] = board[k][BOARD_WIDTH-1] = EmptySquare;
             board[k][1] = board[k][BOARD_WIDTH-2] = (ChessSquare) 0;;
        }
      }
      CopyBoard(partnerBoard, board);
      if(toSqr = strchr(str, '/')) { // extract highlights from long move
        partnerBoard[EP_STATUS-3] = toSqr[1] - AAA; // kludge: hide highlighting info in board
        partnerBoard[EP_STATUS-4] = toSqr[2] - ONE;
      } else partnerBoard[EP_STATUS-4] = partnerBoard[EP_STATUS-3] = -1;
      if(toSqr = strchr(str, '-')) {
        partnerBoard[EP_STATUS-1] = toSqr[1] - AAA;
        partnerBoard[EP_STATUS-2] = toSqr[2] - ONE;
      } else partnerBoard[EP_STATUS-1] = partnerBoard[EP_STATUS-2] = -1;
      if(appData.dualBoard && !twoBoards) { twoBoards = 1; InitDrawingSizes(-2,0); }
      if(twoBoards) { partnerUp = 1; flipView = !flipView; } // [HGM] dual
      if(partnerUp) DrawPosition(FALSE, partnerBoard);
      if(twoBoards) { partnerUp = 0; flipView = !flipView; } // [HGM] dual
      snprintf(partnerStatus, MSG_SIZ,"W: %d:%02d B: %d:%02d (%d-%d) %c", white_time/60000, (white_time%60000)/1000,
                 (black_time/60000), (black_time%60000)/1000, white_stren, black_stren, to_play);
      DisplayMessage(partnerStatus, "");
        partnerBoardValid = TRUE;
      return;
    }

    /* Modify behavior for initial board display on move listing
       of wild games.
       */
    switch (ics_getting_history) {
      case H_FALSE:
      case H_REQUESTED:
        break;
      case H_GOT_REQ_HEADER:
      case H_GOT_UNREQ_HEADER:
        /* This is the initial position of the current game */
        gamenum = ics_gamenum;
        moveNum = 0;            /* old ICS bug workaround */
        if (to_play == 'B') {
          startedFromSetupPosition = TRUE;
          blackPlaysFirst = TRUE;
          moveNum = 1;
          if (forwardMostMove == 0) forwardMostMove = 1;
          if (backwardMostMove == 0) backwardMostMove = 1;
          if (currentMove == 0) currentMove = 1;
        }
        newGameMode = gameMode;
        relation = RELATION_STARTING_POSITION; /* ICC needs this */
        break;
      case H_GOT_UNWANTED_HEADER:
        /* This is an initial board that we don't want */
        return;
      case H_GETTING_MOVES:
        /* Should not happen */
        DisplayError(_("Error gathering move list: extra board"), 0);
        ics_getting_history = H_FALSE;
        return;
    }

   if (gameInfo.boardHeight != ranks || gameInfo.boardWidth != files ||
                                        weird && (int)gameInfo.variant < (int)VariantShogi) {
     /* [HGM] We seem to have switched variant unexpectedly
      * Try to guess new variant from board size
      */
          VariantClass newVariant = VariantFairy; // if 8x8, but fairies present
          if(ranks == 8 && files == 10) newVariant = VariantCapablanca; else
          if(ranks == 10 && files == 9) newVariant = VariantXiangqi; else
          if(ranks == 8 && files == 12) newVariant = VariantCourier; else
          if(ranks == 9 && files == 9)  newVariant = VariantShogi; else
          if(!weird) newVariant = VariantNormal;
          VariantSwitch(boards[currentMove], newVariant); /* temp guess */
          /* Get a move list just to see the header, which
             will tell us whether this is really bug or zh */
          if (ics_getting_history == H_FALSE) {
            ics_getting_history = H_REQUESTED; reqFlag = TRUE;
            snprintf(str, MSG_SIZ, "%smoves %d\n", ics_prefix, gamenum);
            SendToICS(str);
          }
    }

    /* Take action if this is the first board of a new game, or of a
       different game than is currently being displayed.  */
    if (gamenum != ics_gamenum || newGameMode != gameMode ||
        relation == RELATION_ISOLATED_BOARD) {

        /* Forget the old game and get the history (if any) of the new one */
        if (gameMode != BeginningOfGame) {
          Reset(TRUE, TRUE);
        }
        newGame = TRUE;
        if (appData.autoRaiseBoard) BoardToTop();
        prevMove = -3;
        if (gamenum == -1) {
            newGameMode = IcsIdle;
        } else if ((moveNum > 0 || newGameMode == IcsObserving) && newGameMode != IcsIdle &&
                   appData.getMoveList && !reqFlag) {
            /* Need to get game history */
            ics_getting_history = H_REQUESTED;
            snprintf(str, MSG_SIZ, "%smoves %d\n", ics_prefix, gamenum);
            SendToICS(str);
        }

        /* Initially flip the board to have black on the bottom if playing
           black or if the ICS flip flag is set, but let the user change
           it with the Flip View button. */
        flipView = appData.autoFlipView ?
          (newGameMode == IcsPlayingBlack) || ics_flip :
          appData.flipView;

        /* Done with values from previous mode; copy in new ones */
        gameMode = newGameMode;
        ModeHighlight();
        ics_gamenum = gamenum;
        if (gamenum == gs_gamenum) {
            int klen = strlen(gs_kind);
            if (gs_kind[klen - 1] == '.') gs_kind[klen - 1] = NULLCHAR;
            snprintf(str, MSG_SIZ, "ICS %s", gs_kind);
            gameInfo.event = StrSave(str);
        } else {
            gameInfo.event = StrSave("ICS game");
        }
        gameInfo.site = StrSave(appData.icsHost);
        gameInfo.date = PGNDate();
        gameInfo.round = StrSave("-");
        gameInfo.white = StrSave(white);
        gameInfo.black = StrSave(black);
        timeControl = basetime * 60 * 1000;
        timeControl_2 = 0;
        timeIncrement = increment * 1000;
        movesPerSession = 0;
        gameInfo.timeControl = TimeControlTagValue();
        VariantSwitch(boards[currentMove], StringToVariant(gameInfo.event) );
  if (appData.debugMode) {
    fprintf(debugFP, "ParseBoard says variant = '%s'\n", gameInfo.event);
    fprintf(debugFP, "recognized as %s\n", VariantName(gameInfo.variant));
    setbuf(debugFP, NULL);
  }

        gameInfo.outOfBook = NULL;

        /* Do we have the ratings? */
        if (strcmp(player1Name, white) == 0 &&
            strcmp(player2Name, black) == 0) {
            if (appData.debugMode)
              fprintf(debugFP, "Remembered ratings: W %d, B %d\n",
                      player1Rating, player2Rating);
            gameInfo.whiteRating = player1Rating;
            gameInfo.blackRating = player2Rating;
        } else if (strcmp(player2Name, white) == 0 &&
                   strcmp(player1Name, black) == 0) {
            if (appData.debugMode)
              fprintf(debugFP, "Remembered ratings: W %d, B %d\n",
                      player2Rating, player1Rating);
            gameInfo.whiteRating = player2Rating;
            gameInfo.blackRating = player1Rating;
        }
        player1Name[0] = player2Name[0] = NULLCHAR;

        /* Silence shouts if requested */
        if (appData.quietPlay &&
            (gameMode == IcsPlayingWhite || gameMode == IcsPlayingBlack)) {
            SendToICS(ics_prefix);
            SendToICS("set shout 0\n");
        }
    }

    /* Deal with midgame name changes */
    if (!newGame) {
        if (!gameInfo.white || strcmp(gameInfo.white, white) != 0) {
            if (gameInfo.white) free(gameInfo.white);
            gameInfo.white = StrSave(white);
        }
        if (!gameInfo.black || strcmp(gameInfo.black, black) != 0) {
            if (gameInfo.black) free(gameInfo.black);
            gameInfo.black = StrSave(black);
        }
    }

    /* Throw away game result if anything actually changes in examine mode */
    if (gameMode == IcsExamining && !newGame) {
        gameInfo.result = GameUnfinished;
        if (gameInfo.resultDetails != NULL) {
            free(gameInfo.resultDetails);
            gameInfo.resultDetails = NULL;
        }
    }

    /* In pausing && IcsExamining mode, we ignore boards coming
       in if they are in a different variation than we are. */
    if (pauseExamInvalid) return;
    if (pausing && gameMode == IcsExamining) {
        if (moveNum <= pauseExamForwardMostMove) {
            pauseExamInvalid = TRUE;
            forwardMostMove = pauseExamForwardMostMove;
            return;
        }
    }

  if (appData.debugMode) {
    fprintf(debugFP, "load %dx%d board\n", files, ranks);
  }
    /* Parse the board */
    for (k = 0; k < ranks; k++) {
      for (j = 0; j < files; j++)
        board[k][j+gameInfo.holdingsWidth] = CharToPiece(board_chars[(ranks-1-k)*(files+1) + j]);
      if(gameInfo.holdingsWidth > 1) {
           board[k][0] = board[k][BOARD_WIDTH-1] = EmptySquare;
           board[k][1] = board[k][BOARD_WIDTH-2] = (ChessSquare) 0;;
      }
    }
    if(moveNum==0 && gameInfo.variant == VariantSChess) {
      board[5][BOARD_RGHT+1] = WhiteAngel;
      board[6][BOARD_RGHT+1] = WhiteMarshall;
      board[1][0] = BlackMarshall;
      board[2][0] = BlackAngel;
      board[1][1] = board[2][1] = board[5][BOARD_RGHT] = board[6][BOARD_RGHT] = 1;
    }
    CopyBoard(boards[moveNum], board);
    boards[moveNum][HOLDINGS_SET] = 0; // [HGM] indicate holdings not set
    if (moveNum == 0) {
        startedFromSetupPosition =
          !CompareBoards(board, initialPosition);
        if(startedFromSetupPosition)
            initialRulePlies = irrev_count; /* [HGM] 50-move counter offset */
    }

    /* [HGM] Set castling rights. Take the outermost Rooks,
       to make it also work for FRC opening positions. Note that board12
       is really defective for later FRC positions, as it has no way to
       indicate which Rook can castle if they are on the same side of King.
       For the initial position we grant rights to the outermost Rooks,
       and remember thos rights, and we then copy them on positions
       later in an FRC game. This means WB might not recognize castlings with
       Rooks that have moved back to their original position as illegal,
       but in ICS mode that is not its job anyway.
    */
    if(moveNum == 0 || gameInfo.variant != VariantFischeRandom)
    { int i, j; ChessSquare wKing = WhiteKing, bKing = BlackKing;

        for(i=BOARD_LEFT, j=NoRights; i<BOARD_RGHT; i++)
            if(board[0][i] == WhiteRook) j = i;
        initialRights[0] = boards[moveNum][CASTLING][0] = (castle_ws == 0 && gameInfo.variant != VariantFischeRandom ? NoRights : j);
        for(i=BOARD_RGHT-1, j=NoRights; i>=BOARD_LEFT; i--)
            if(board[0][i] == WhiteRook) j = i;
        initialRights[1] = boards[moveNum][CASTLING][1] = (castle_wl == 0 && gameInfo.variant != VariantFischeRandom ? NoRights : j);
        for(i=BOARD_LEFT, j=NoRights; i<BOARD_RGHT; i++)
            if(board[BOARD_HEIGHT-1][i] == BlackRook) j = i;
        initialRights[3] = boards[moveNum][CASTLING][3] = (castle_bs == 0 && gameInfo.variant != VariantFischeRandom ? NoRights : j);
        for(i=BOARD_RGHT-1, j=NoRights; i>=BOARD_LEFT; i--)
            if(board[BOARD_HEIGHT-1][i] == BlackRook) j = i;
        initialRights[4] = boards[moveNum][CASTLING][4] = (castle_bl == 0 && gameInfo.variant != VariantFischeRandom ? NoRights : j);

        boards[moveNum][CASTLING][2] = boards[moveNum][CASTLING][5] = NoRights;
        if(gameInfo.variant == VariantKnightmate) { wKing = WhiteUnicorn; bKing = BlackUnicorn; }
        for(k=BOARD_LEFT; k<BOARD_RGHT; k++)
            if(board[0][k] == wKing) initialRights[2] = boards[moveNum][CASTLING][2] = k;
        for(k=BOARD_LEFT; k<BOARD_RGHT; k++)
            if(board[BOARD_HEIGHT-1][k] == bKing)
                initialRights[5] = boards[moveNum][CASTLING][5] = k;
        if(gameInfo.variant == VariantTwoKings) {
            // In TwoKings looking for a King does not work, so always give castling rights to a King on e1/e8
            if(board[0][4] == wKing) initialRights[2] = boards[moveNum][CASTLING][2] = 4;
            if(board[BOARD_HEIGHT-1][4] == bKing) initialRights[5] = boards[moveNum][CASTLING][5] = 4;
        }
    } else { int r;
        r = boards[moveNum][CASTLING][0] = initialRights[0];
        if(board[0][r] != WhiteRook) boards[moveNum][CASTLING][0] = NoRights;
        r = boards[moveNum][CASTLING][1] = initialRights[1];
        if(board[0][r] != WhiteRook) boards[moveNum][CASTLING][1] = NoRights;
        r = boards[moveNum][CASTLING][3] = initialRights[3];
        if(board[BOARD_HEIGHT-1][r] != BlackRook) boards[moveNum][CASTLING][3] = NoRights;
        r = boards[moveNum][CASTLING][4] = initialRights[4];
        if(board[BOARD_HEIGHT-1][r] != BlackRook) boards[moveNum][CASTLING][4] = NoRights;
        /* wildcastle kludge: always assume King has rights */
        r = boards[moveNum][CASTLING][2] = initialRights[2];
        r = boards[moveNum][CASTLING][5] = initialRights[5];
    }
    /* [HGM] e.p. rights. Assume that ICS sends file number here? */
    boards[moveNum][EP_STATUS] = double_push == -1 ? EP_NONE : double_push + BOARD_LEFT;


    if (ics_getting_history == H_GOT_REQ_HEADER ||
        ics_getting_history == H_GOT_UNREQ_HEADER) {
        /* This was an initial position from a move list, not
           the current position */
        return;
    }

    /* Update currentMove and known move number limits */
    newMove = newGame || moveNum > forwardMostMove;

    if (newGame) {
        forwardMostMove = backwardMostMove = currentMove = moveNum;
        if (gameMode == IcsExamining && moveNum == 0) {
          /* Workaround for ICS limitation: we are not told the wild
             type when starting to examine a game.  But if we ask for
             the move list, the move list header will tell us */
            ics_getting_history = H_REQUESTED;
            snprintf(str, MSG_SIZ, "%smoves %d\n", ics_prefix, gamenum);
            SendToICS(str);
        }
    } else if (moveNum == forwardMostMove + 1 || moveNum == forwardMostMove
               || (moveNum < forwardMostMove && moveNum >= backwardMostMove)) {
#if ZIPPY
        /* [DM] If we found takebacks during icsEngineAnalyze try send to engine */
        /* [HGM] applied this also to an engine that is silently watching        */
        if (appData.zippyPlay && moveNum < forwardMostMove && first.initDone &&
            (gameMode == IcsObserving || gameMode == IcsExamining) &&
            gameInfo.variant == currentlyInitializedVariant) {
          takeback = forwardMostMove - moveNum;
          for (i = 0; i < takeback; i++) {
            if (appData.debugMode) fprintf(debugFP, "take back move\n");
            SendToProgram("undo\n", &first);
          }
        }
#endif

        forwardMostMove = moveNum;
        if (!pausing || currentMove > forwardMostMove)
          currentMove = forwardMostMove;
    } else {
        /* New part of history that is not contiguous with old part */
        if (pausing && gameMode == IcsExamining) {
            pauseExamInvalid = TRUE;
            forwardMostMove = pauseExamForwardMostMove;
            return;
        }
        if (gameMode == IcsExamining && moveNum > 0 && appData.getMoveList) {
#if ZIPPY
            if(appData.zippyPlay && forwardMostMove > 0 && first.initDone) {
                // [HGM] when we will receive the move list we now request, it will be
                // fed to the engine from the first move on. So if the engine is not
                // in the initial position now, bring it there.
                InitChessProgram(&first, 0);
            }
#endif
            ics_getting_history = H_REQUESTED;
            snprintf(str, MSG_SIZ, "%smoves %d\n", ics_prefix, gamenum);
            SendToICS(str);
        }
        forwardMostMove = backwardMostMove = currentMove = moveNum;
    }

    /* Update the clocks */
    if (strchr(elapsed_time, '.')) {
      /* Time is in ms */
      timeRemaining[0][moveNum] = whiteTimeRemaining = white_time;
      timeRemaining[1][moveNum] = blackTimeRemaining = black_time;
    } else {
      /* Time is in seconds */
      timeRemaining[0][moveNum] = whiteTimeRemaining = white_time * 1000;
      timeRemaining[1][moveNum] = blackTimeRemaining = black_time * 1000;
    }


#if ZIPPY
    if (appData.zippyPlay && newGame &&
        gameMode != IcsObserving && gameMode != IcsIdle &&
        gameMode != IcsExamining)
      ZippyFirstBoard(moveNum, basetime, increment);
#endif

    /* Put the move on the move list, first converting
       to canonical algebraic form. */
    if (moveNum > 0) {
  if (appData.debugMode) {
    if (appData.debugMode) { int f = forwardMostMove;
        fprintf(debugFP, "parseboard %d, castling = %d %d %d %d %d %d\n", f,
                boards[f][CASTLING][0],boards[f][CASTLING][1],boards[f][CASTLING][2],
                boards[f][CASTLING][3],boards[f][CASTLING][4],boards[f][CASTLING][5]);
    }
    fprintf(debugFP, "accepted move %s from ICS, parse it.\n", move_str);
    fprintf(debugFP, "moveNum = %d\n", moveNum);
    fprintf(debugFP, "board = %d-%d x %d\n", BOARD_LEFT, BOARD_RGHT, BOARD_HEIGHT);
    setbuf(debugFP, NULL);
  }
        if (moveNum <= backwardMostMove) {
            /* We don't know what the board looked like before
               this move.  Punt. */
          safeStrCpy(parseList[moveNum - 1], move_str, sizeof(parseList[moveNum - 1])/sizeof(parseList[moveNum - 1][0]));
            strcat(parseList[moveNum - 1], " ");
            strcat(parseList[moveNum - 1], elapsed_time);
            moveList[moveNum - 1][0] = NULLCHAR;
        } else if (strcmp(move_str, "none") == 0) {
            // [HGM] long SAN: swapped order; test for 'none' before parsing move
            /* Again, we don't know what the board looked like;
               this is really the start of the game. */
            parseList[moveNum - 1][0] = NULLCHAR;
            moveList[moveNum - 1][0] = NULLCHAR;
            backwardMostMove = moveNum;
            startedFromSetupPosition = TRUE;
            fromX = fromY = toX = toY = -1;
        } else {
          // [HGM] long SAN: if legality-testing is off, disambiguation might not work or give wrong move.
          //                 So we parse the long-algebraic move string in stead of the SAN move
          int valid; char buf[MSG_SIZ], *prom;

          if(gameInfo.variant == VariantShogi && !strchr(move_str, '=') && !strchr(move_str, '@'))
                strcat(move_str, "="); // if ICS does not say 'promote' on non-drop, we defer.
          // str looks something like "Q/a1-a2"; kill the slash
          if(str[1] == '/')
            snprintf(buf, MSG_SIZ,"%c%s", str[0], str+2);
          else  safeStrCpy(buf, str, sizeof(buf)/sizeof(buf[0])); // might be castling
          if((prom = strstr(move_str, "=")) && !strstr(buf, "="))
                strcat(buf, prom); // long move lacks promo specification!
          if(!appData.testLegality && move_str[1] != '@') { // drops never ambiguous (parser chokes on long form!)
                if(appData.debugMode)
                        fprintf(debugFP, "replaced ICS move '%s' by '%s'\n", move_str, buf);
                safeStrCpy(move_str, buf, MSG_SIZ);
          }
          valid = ParseOneMove(move_str, moveNum - 1, &moveType,
                                &fromX, &fromY, &toX, &toY, &promoChar)
               || ParseOneMove(buf, moveNum - 1, &moveType,
                                &fromX, &fromY, &toX, &toY, &promoChar);
          // end of long SAN patch
          if (valid) {
            (void) CoordsToAlgebraic(boards[moveNum - 1],
                                     PosFlags(moveNum - 1),
                                     fromY, fromX, toY, toX, promoChar,
                                     parseList[moveNum-1]);
            switch (MateTest(boards[moveNum], PosFlags(moveNum)) ) {
              case MT_NONE:
              case MT_STALEMATE:
              default:
                break;
              case MT_CHECK:
                if(gameInfo.variant != VariantShogi)
                    strcat(parseList[moveNum - 1], "+");
                break;
              case MT_CHECKMATE:
              case MT_STAINMATE: // [HGM] xq: for notation stalemate that wins counts as checkmate
                strcat(parseList[moveNum - 1], "#");
                break;
            }
            strcat(parseList[moveNum - 1], " ");
            strcat(parseList[moveNum - 1], elapsed_time);
            /* currentMoveString is set as a side-effect of ParseOneMove */
            if(gameInfo.variant == VariantShogi && currentMoveString[4]) currentMoveString[4] = '^';
            safeStrCpy(moveList[moveNum - 1], currentMoveString, sizeof(moveList[moveNum - 1])/sizeof(moveList[moveNum - 1][0]));
            strcat(moveList[moveNum - 1], "\n");

            if(gameInfo.holdingsWidth && !appData.disguise && gameInfo.variant != VariantSuper && gameInfo.variant != VariantGreat
               && gameInfo.variant != VariantGrand&& gameInfo.variant != VariantSChess) // inherit info that ICS does not give from previous board
              for(k=0; k<ranks; k++) for(j=BOARD_LEFT; j<BOARD_RGHT; j++) {
                ChessSquare old, new = boards[moveNum][k][j];
                  if(fromY == DROP_RANK && k==toY && j==toX) continue; // dropped pieces always stand for themselves
                  old = (k==toY && j==toX) ? boards[moveNum-1][fromY][fromX] : boards[moveNum-1][k][j]; // trace back mover
                  if(old == new) continue;
                  if(old == PROMOTED new) boards[moveNum][k][j] = old; // prevent promoted pieces to revert to primordial ones
                  else if(new == WhiteWazir || new == BlackWazir) {
                      if(old < WhiteCannon || old >= BlackPawn && old < BlackCannon)
                           boards[moveNum][k][j] = PROMOTED old; // choose correct type of Gold in promotion
                      else boards[moveNum][k][j] = old; // preserve type of Gold
                  } else if((old == WhitePawn || old == BlackPawn) && new != EmptySquare) // Pawn promotions (but not e.p.capture!)
                      boards[moveNum][k][j] = PROMOTED new; // use non-primordial representation of chosen piece
              }
          } else {
            /* Move from ICS was illegal!?  Punt. */
            if (appData.debugMode) {
              fprintf(debugFP, "Illegal move from ICS '%s'\n", move_str);
              fprintf(debugFP, "board L=%d, R=%d, H=%d, holdings=%d\n", BOARD_LEFT, BOARD_RGHT, BOARD_HEIGHT, gameInfo.holdingsWidth);
            }
            safeStrCpy(parseList[moveNum - 1], move_str, sizeof(parseList[moveNum - 1])/sizeof(parseList[moveNum - 1][0]));
            strcat(parseList[moveNum - 1], " ");
            strcat(parseList[moveNum - 1], elapsed_time);
            moveList[moveNum - 1][0] = NULLCHAR;
            fromX = fromY = toX = toY = -1;
          }
        }
  if (appData.debugMode) {
    fprintf(debugFP, "Move parsed to '%s'\n", parseList[moveNum - 1]);
    setbuf(debugFP, NULL);
  }

#if ZIPPY
        /* Send move to chess program (BEFORE animating it). */
        if (appData.zippyPlay && !newGame && newMove &&
           (!appData.getMoveList || backwardMostMove == 0) && first.initDone) {

            if ((gameMode == IcsPlayingWhite && WhiteOnMove(moveNum)) ||
                (gameMode == IcsPlayingBlack && !WhiteOnMove(moveNum))) {
                if (moveList[moveNum - 1][0] == NULLCHAR) {
                  snprintf(str, MSG_SIZ, _("Couldn't parse move \"%s\" from ICS"),
                            move_str);
                    DisplayError(str, 0);
                } else {
                    if (first.sendTime) {
                        SendTimeRemaining(&first, gameMode == IcsPlayingWhite);
                    }
                    bookHit = SendMoveToBookUser(moveNum - 1, &first, FALSE); // [HGM] book
                    if (firstMove && !bookHit) {
                        firstMove = FALSE;
                        if (first.useColors) {
                          SendToProgram(gameMode == IcsPlayingWhite ?
                                        "white\ngo\n" :
                                        "black\ngo\n", &first);
                        } else {
                          SendToProgram("go\n", &first);
                        }
                        first.maybeThinking = TRUE;
                    }
                }
            } else if (gameMode == IcsObserving || gameMode == IcsExamining) {
              if (moveList[moveNum - 1][0] == NULLCHAR) {
                snprintf(str, MSG_SIZ, _("Couldn't parse move \"%s\" from ICS"), move_str);
                DisplayError(str, 0);
              } else {
                if(gameInfo.variant == currentlyInitializedVariant) // [HGM] refrain sending moves engine can't understand!
                SendMoveToProgram(moveNum - 1, &first);
              }
            }
        }
#endif
    }

    if (moveNum > 0 && !gotPremove && !appData.noGUI) {
        /* If move comes from a remote source, animate it.  If it
           isn't remote, it will have already been animated. */
        if (!pausing && !ics_user_moved && prevMove == moveNum - 1) {
            AnimateMove(boards[moveNum - 1], fromX, fromY, toX, toY);
        }
        if (!pausing && appData.highlightLastMove) {
            SetHighlights(fromX, fromY, toX, toY);
        }
    }

    /* Start the clocks */
    whiteFlag = blackFlag = FALSE;
    appData.clockMode = !(basetime == 0 && increment == 0);
    if (ticking == 0) {
      ics_clock_paused = TRUE;
      StopClocks();
    } else if (ticking == 1) {
      ics_clock_paused = FALSE;
    }
    if (gameMode == IcsIdle ||
        relation == RELATION_OBSERVING_STATIC ||
        relation == RELATION_EXAMINING ||
        ics_clock_paused)
      DisplayBothClocks();
    else
      StartClocks();

    /* Display opponents and material strengths */
    if (gameInfo.variant != VariantBughouse &&
        gameInfo.variant != VariantCrazyhouse && !appData.noGUI) {
        if (tinyLayout || smallLayout) {
            if(gameInfo.variant == VariantNormal)
              snprintf(str, MSG_SIZ, "%s(%d) %s(%d) {%d %d}",
                    gameInfo.white, white_stren, gameInfo.black, black_stren,
                    basetime, increment);
            else
              snprintf(str, MSG_SIZ, "%s(%d) %s(%d) {%d %d w%d}",
                    gameInfo.white, white_stren, gameInfo.black, black_stren,
                    basetime, increment, (int) gameInfo.variant);
        } else {
            if(gameInfo.variant == VariantNormal)
              snprintf(str, MSG_SIZ, "%s (%d) %s %s (%d) {%d %d}",
                    gameInfo.white, white_stren, _("vs."), gameInfo.black, black_stren,
                    basetime, increment);
            else
              snprintf(str, MSG_SIZ, "%s (%d) %s %s (%d) {%d %d %s}",
                    gameInfo.white, white_stren, _("vs."), gameInfo.black, black_stren,
                    basetime, increment, VariantName(gameInfo.variant));
        }
        DisplayTitle(str);
  if (appData.debugMode) {
    fprintf(debugFP, "Display title '%s, gameInfo.variant = %d'\n", str, gameInfo.variant);
  }
    }


    /* Display the board */
    if (!pausing && !appData.noGUI) {

      if (appData.premove)
          if (!gotPremove ||
             ((gameMode == IcsPlayingWhite) && (WhiteOnMove(currentMove))) ||
             ((gameMode == IcsPlayingBlack) && (!WhiteOnMove(currentMove))))
              ClearPremoveHighlights();

      j = seekGraphUp; seekGraphUp = FALSE; // [HGM] seekgraph: when we draw a board, it overwrites the seek graph
        if(partnerUp) { flipView = originalFlip; partnerUp = FALSE; j = TRUE; } // [HGM] bughouse: restore view
      DrawPosition(j, boards[currentMove]);

      DisplayMove(moveNum - 1);
      if (appData.ringBellAfterMoves && /*!ics_user_moved*/ // [HGM] use absolute method to recognize own move
            !((gameMode == IcsPlayingWhite) && (!WhiteOnMove(moveNum)) ||
              (gameMode == IcsPlayingBlack) &&  (WhiteOnMove(moveNum))   ) ) {
        if(newMove) RingBell(); else PlayIcsUnfinishedSound();
      }
    }

    HistorySet(parseList, backwardMostMove, forwardMostMove, currentMove-1);
#if ZIPPY
    if(bookHit) { // [HGM] book: simulate book reply
        static char bookMove[MSG_SIZ]; // a bit generous?

        programStats.nodes = programStats.depth = programStats.time =
        programStats.score = programStats.got_only_move = 0;
        sprintf(programStats.movelist, "%s (xbook)", bookHit);

        safeStrCpy(bookMove, "move ", sizeof(bookMove)/sizeof(bookMove[0]));
        strcat(bookMove, bookHit);
        HandleMachineMove(bookMove, &first);
    }
#endif
}

void
GetMoveListEvent ()
{
    char buf[MSG_SIZ];
    if (appData.icsActive && gameMode != IcsIdle && ics_gamenum > 0) {
        ics_getting_history = H_REQUESTED;
        snprintf(buf, MSG_SIZ, "%smoves %d\n", ics_prefix, ics_gamenum);
        SendToICS(buf);
    }
}

void
AnalysisPeriodicEvent (int force)
{
    if (((programStats.ok_to_send == 0 || programStats.line_is_book)
         && !force) || !appData.periodicUpdates)
      return;

    /* Send . command to Crafty to collect stats */
    SendToProgram(".\n", &first);

    /* Don't send another until we get a response (this makes
       us stop sending to old Crafty's which don't understand
       the "." command (sending illegal cmds resets node count & time,
       which looks bad)) */
    programStats.ok_to_send = 0;
}

void
ics_update_width (int new_width)
{
        ics_printf("set width %d\n", new_width);
}

void
SendMoveToProgram (int moveNum, ChessProgramState *cps)
{
    char buf[MSG_SIZ];

    if(moveList[moveNum][1] == '@' && moveList[moveNum][0] == '@') {
        // null move in variant where engine does not understand it (for analysis purposes)
        SendBoard(cps, moveNum + 1); // send position after move in stead.
        return;
    }
    if (cps->useUsermove) {
      SendToProgram("usermove ", cps);
    }
    if (cps->useSAN) {
      char *space;
      if ((space = strchr(parseList[moveNum], ' ')) != NULL) {
        int len = space - parseList[moveNum];
        memcpy(buf, parseList[moveNum], len);
        buf[len++] = '\n';
        buf[len] = NULLCHAR;
      } else {
        snprintf(buf, MSG_SIZ,"%s\n", parseList[moveNum]);
      }
      SendToProgram(buf, cps);
    } else {
      if(cps->alphaRank) { /* [HGM] shogi: temporarily convert to shogi coordinates before sending */
        AlphaRank(moveList[moveNum], 4);
        SendToProgram(moveList[moveNum], cps);
        AlphaRank(moveList[moveNum], 4); // and back
      } else
      /* Added by Tord: Send castle moves in "O-O" in FRC games if required by
       * the engine. It would be nice to have a better way to identify castle
       * moves here. */
      if((gameInfo.variant == VariantFischeRandom || gameInfo.variant == VariantCapaRandom)
                                                                         && cps->useOOCastle) {
        int fromX = moveList[moveNum][0] - AAA;
        int fromY = moveList[moveNum][1] - ONE;
        int toX = moveList[moveNum][2] - AAA;
        int toY = moveList[moveNum][3] - ONE;
        if((boards[moveNum][fromY][fromX] == WhiteKing
            && boards[moveNum][toY][toX] == WhiteRook)
           || (boards[moveNum][fromY][fromX] == BlackKing
               && boards[moveNum][toY][toX] == BlackRook)) {
          if(toX > fromX) SendToProgram("O-O\n", cps);
          else SendToProgram("O-O-O\n", cps);
        }
        else SendToProgram(moveList[moveNum], cps);
      } else
      if(BOARD_HEIGHT > 10) { // [HGM] big: convert ranks to double-digit where needed
        if(moveList[moveNum][1] == '@' && (BOARD_HEIGHT < 16 || moveList[moveNum][0] <= 'Z')) { // drop move
          if(moveList[moveNum][0]== '@') snprintf(buf, MSG_SIZ, "@@@@\n"); else
          snprintf(buf, MSG_SIZ, "%c@%c%d%s", moveList[moveNum][0],
                                              moveList[moveNum][2], moveList[moveNum][3] - '0', moveList[moveNum]+4);
        } else
          snprintf(buf, MSG_SIZ, "%c%d%c%d%s", moveList[moveNum][0], moveList[moveNum][1] - '0',
                                               moveList[moveNum][2], moveList[moveNum][3] - '0', moveList[moveNum]+4);
        SendToProgram(buf, cps);
      }
      else SendToProgram(moveList[moveNum], cps);
      /* End of additions by Tord */
    }

    /* [HGM] setting up the opening has brought engine in force mode! */
    /*       Send 'go' if we are in a mode where machine should play. */
    if( (moveNum == 0 && setboardSpoiledMachineBlack && cps == &first) &&
        (gameMode == TwoMachinesPlay   ||
#if ZIPPY
         gameMode == IcsPlayingBlack     || gameMode == IcsPlayingWhite ||
#endif
         gameMode == MachinePlaysBlack || gameMode == MachinePlaysWhite) ) {
        SendToProgram("go\n", cps);
  if (appData.debugMode) {
    fprintf(debugFP, "(extra)\n");
  }
    }
    setboardSpoiledMachineBlack = 0;
}

void
SendMoveToICS (ChessMove moveType, int fromX, int fromY, int toX, int toY, char promoChar)
{
    char user_move[MSG_SIZ];
    char suffix[4];

    if(gameInfo.variant == VariantSChess && promoChar) {
        snprintf(suffix, 4, "=%c", toX == BOARD_WIDTH<<1 ? ToUpper(promoChar) : ToLower(promoChar));
        if(moveType == NormalMove) moveType = WhitePromotion; // kludge to do gating
    } else suffix[0] = NULLCHAR;

    switch (moveType) {
      default:
        snprintf(user_move, MSG_SIZ, _("say Internal error; bad moveType %d (%d,%d-%d,%d)"),
                (int)moveType, fromX, fromY, toX, toY);
        DisplayError(user_move + strlen("say "), 0);
        break;
      case WhiteKingSideCastle:
      case BlackKingSideCastle:
      case WhiteQueenSideCastleWild:
      case BlackQueenSideCastleWild:
      /* PUSH Fabien */
      case WhiteHSideCastleFR:
      case BlackHSideCastleFR:
      /* POP Fabien */
        snprintf(user_move, MSG_SIZ, "o-o%s\n", suffix);
        break;
      case WhiteQueenSideCastle:
      case BlackQueenSideCastle:
      case WhiteKingSideCastleWild:
      case BlackKingSideCastleWild:
      /* PUSH Fabien */
      case WhiteASideCastleFR:
      case BlackASideCastleFR:
      /* POP Fabien */
        snprintf(user_move, MSG_SIZ, "o-o-o%s\n",suffix);
        break;
      case WhiteNonPromotion:
      case BlackNonPromotion:
        sprintf(user_move, "%c%c%c%c==\n", AAA + fromX, ONE + fromY, AAA + toX, ONE + toY);
        break;
      case WhitePromotion:
      case BlackPromotion:
        if(gameInfo.variant == VariantShatranj || gameInfo.variant == VariantCourier || gameInfo.variant == VariantMakruk)
          snprintf(user_move, MSG_SIZ, "%c%c%c%c=%c\n",
                AAA + fromX, ONE + fromY, AAA + toX, ONE + toY,
                PieceToChar(WhiteFerz));
        else if(gameInfo.variant == VariantGreat)
          snprintf(user_move, MSG_SIZ,"%c%c%c%c=%c\n",
                AAA + fromX, ONE + fromY, AAA + toX, ONE + toY,
                PieceToChar(WhiteMan));
        else
          snprintf(user_move, MSG_SIZ, "%c%c%c%c=%c\n",
                AAA + fromX, ONE + fromY, AAA + toX, ONE + toY,
                promoChar);
        break;
      case WhiteDrop:
      case BlackDrop:
      drop:
        snprintf(user_move, MSG_SIZ, "%c@%c%c\n",
                 ToUpper(PieceToChar((ChessSquare) fromX)),
                 AAA + toX, ONE + toY);
        break;
      case IllegalMove:  /* could be a variant we don't quite understand */
        if(fromY == DROP_RANK) goto drop; // We need 'IllegalDrop' move type?
      case NormalMove:
      case WhiteCapturesEnPassant:
      case BlackCapturesEnPassant:
        snprintf(user_move, MSG_SIZ,"%c%c%c%c\n",
                AAA + fromX, ONE + fromY, AAA + toX, ONE + toY);
        break;
    }
    SendToICS(user_move);
    if(appData.keepAlive) // [HGM] alive: schedule sending of dummy 'date' command
        ScheduleDelayedEvent(KeepAlive, appData.keepAlive*60*1000);
}

void
UploadGameEvent ()
{   // [HGM] upload: send entire stored game to ICS as long-algebraic moves.
    int i, last = forwardMostMove; // make sure ICS reply cannot pre-empt us by clearing fmm
    static char *castlingStrings[4] = { "none", "kside", "qside", "both" };
    if(gameMode == IcsObserving || gameMode == IcsPlayingBlack || gameMode == IcsPlayingWhite) {
      DisplayError(_("You cannot do this while you are playing or observing"), 0);
      return;
    }
    if(gameMode != IcsExamining) { // is this ever not the case?
        char buf[MSG_SIZ], *p, *fen, command[MSG_SIZ], bsetup = 0;

        if(ics_type == ICS_ICC) { // on ICC match ourselves in applicable variant
          snprintf(command,MSG_SIZ, "match %s", ics_handle);
        } else { // on FICS we must first go to general examine mode
          safeStrCpy(command, "examine\nbsetup", sizeof(command)/sizeof(command[0])); // and specify variant within it with bsetups
        }
        if(gameInfo.variant != VariantNormal) {
            // try figure out wild number, as xboard names are not always valid on ICS
            for(i=1; i<=36; i++) {
              snprintf(buf, MSG_SIZ, "wild/%d", i);
                if(StringToVariant(buf) == gameInfo.variant) break;
            }
            if(i<=36 && ics_type == ICS_ICC) snprintf(buf, MSG_SIZ,"%s w%d\n", command, i);
            else if(i == 22) snprintf(buf,MSG_SIZ, "%s fr\n", command);
            else snprintf(buf, MSG_SIZ,"%s %s\n", command, VariantName(gameInfo.variant));
        } else snprintf(buf, MSG_SIZ,"%s\n", ics_type == ICS_ICC ? command : "examine\n"); // match yourself or examine
        SendToICS(ics_prefix);
        SendToICS(buf);
        if(startedFromSetupPosition || backwardMostMove != 0) {
          fen = PositionToFEN(backwardMostMove, NULL);
          if(ics_type == ICS_ICC) { // on ICC we can simply send a complete FEN to set everything
            snprintf(buf, MSG_SIZ,"loadfen %s\n", fen);
            SendToICS(buf);
          } else { // FICS: everything has to set by separate bsetup commands
            p = strchr(fen, ' '); p[0] = NULLCHAR; // cut after board
            snprintf(buf, MSG_SIZ,"bsetup fen %s\n", fen);
            SendToICS(buf);
            if(!WhiteOnMove(backwardMostMove)) {
                SendToICS("bsetup tomove black\n");
            }
            i = (strchr(p+3, 'K') != NULL) + 2*(strchr(p+3, 'Q') != NULL);
            snprintf(buf, MSG_SIZ,"bsetup wcastle %s\n", castlingStrings[i]);
            SendToICS(buf);
            i = (strchr(p+3, 'k') != NULL) + 2*(strchr(p+3, 'q') != NULL);
            snprintf(buf, MSG_SIZ, "bsetup bcastle %s\n", castlingStrings[i]);
            SendToICS(buf);
            i = boards[backwardMostMove][EP_STATUS];
            if(i >= 0) { // set e.p.
              snprintf(buf, MSG_SIZ,"bsetup eppos %c\n", i+AAA);
                SendToICS(buf);
            }
            bsetup++;
          }
        }
      if(bsetup || ics_type != ICS_ICC && gameInfo.variant != VariantNormal)
            SendToICS("bsetup done\n"); // switch to normal examining.
    }
    for(i = backwardMostMove; i<last; i++) {
        char buf[20];
        snprintf(buf, sizeof(buf)/sizeof(buf[0]),"%s\n", parseList[i]);
        SendToICS(buf);
    }
    SendToICS(ics_prefix);
    SendToICS(ics_type == ICS_ICC ? "tag result Game in progress\n" : "commit\n");
}

void
CoordsToComputerAlgebraic (int rf, int ff, int rt, int ft, char promoChar, char move[7])
{
    if (rf == DROP_RANK) {
      if(ff == EmptySquare) sprintf(move, "@@@@\n"); else // [HGM] pass
      sprintf(move, "%c@%c%c\n",
                ToUpper(PieceToChar((ChessSquare) ff)), AAA + ft, ONE + rt);
    } else {
        if (promoChar == 'x' || promoChar == NULLCHAR) {
          sprintf(move, "%c%c%c%c\n",
                    AAA + ff, ONE + rf, AAA + ft, ONE + rt);
        } else {
            sprintf(move, "%c%c%c%c%c\n",
                    AAA + ff, ONE + rf, AAA + ft, ONE + rt, promoChar);
        }
    }
}

void
ProcessICSInitScript (FILE *f)
{
    char buf[MSG_SIZ];

    while (fgets(buf, MSG_SIZ, f)) {
        SendToICSDelayed(buf,(long)appData.msLoginDelay);
    }

    fclose(f);
}


static int lastX, lastY, selectFlag, dragging;

void
Sweep (int step)
{
    ChessSquare king = WhiteKing, pawn = WhitePawn, last = promoSweep;
    if(gameInfo.variant == VariantKnightmate) king = WhiteUnicorn;
    if(gameInfo.variant == VariantSuicide || gameInfo.variant == VariantGiveaway) king = EmptySquare;
    if(promoSweep >= BlackPawn) king = WHITE_TO_BLACK king, pawn = WHITE_TO_BLACK pawn;
    if(gameInfo.variant == VariantSpartan && pawn == BlackPawn) pawn = BlackLance, king = EmptySquare;
    if(fromY != BOARD_HEIGHT-2 && fromY != 1) pawn = EmptySquare;
    do {
        promoSweep -= step;
        if(promoSweep == EmptySquare) promoSweep = BlackPawn; // wrap
        else if((int)promoSweep == -1) promoSweep = WhiteKing;
        else if(promoSweep == BlackPawn && step < 0) promoSweep = WhitePawn;
        else if(promoSweep == WhiteKing && step > 0) promoSweep = BlackKing;
        if(!step) step = -1;
    } while(PieceToChar(promoSweep) == '.' || PieceToChar(promoSweep) == '~' || promoSweep == pawn ||
            appData.testLegality && (promoSweep == king ||
            gameInfo.variant == VariantShogi && promoSweep != PROMOTED last && last != PROMOTED promoSweep && last != promoSweep));
    ChangeDragPiece(promoSweep);
}

int
PromoScroll (int x, int y)
{
  int step = 0;

  if(promoSweep == EmptySquare || !appData.sweepSelect) return FALSE;
  if(abs(x - lastX) < 25 && abs(y - lastY) < 25) return FALSE;
  if( y > lastY + 2 ) step = -1; else if(y < lastY - 2) step = 1;
  if(!step) return FALSE;
  lastX = x; lastY = y;
  if((promoSweep < BlackPawn) == flipView) step = -step;
  if(step > 0) selectFlag = 1;
  if(!selectFlag) Sweep(step);
  return FALSE;
}

void
NextPiece (int step)
{
    ChessSquare piece = boards[currentMove][toY][toX];
    do {
        pieceSweep -= step;
        if(pieceSweep == EmptySquare) pieceSweep = WhitePawn; // wrap
        if((int)pieceSweep == -1) pieceSweep = BlackKing;
        if(!step) step = -1;
    } while(PieceToChar(pieceSweep) == '.');
    boards[currentMove][toY][toX] = pieceSweep;
    DrawPosition(FALSE, boards[currentMove]);
    boards[currentMove][toY][toX] = piece;
}
/* [HGM] Shogi move preprocessor: swap digits for letters, vice versa */
void
AlphaRank (char *move, int n)
{
//    char *p = move, c; int x, y;

    if (appData.debugMode) {
        fprintf(debugFP, "alphaRank(%s,%d)\n", move, n);
    }

    if(move[1]=='*' &&
       move[2]>='0' && move[2]<='9' &&
       move[3]>='a' && move[3]<='x'    ) {
        move[1] = '@';
        move[2] = BOARD_RGHT  -1 - (move[2]-'1') + AAA;
        move[3] = BOARD_HEIGHT-1 - (move[3]-'a') + ONE;
    } else
    if(move[0]>='0' && move[0]<='9' &&
       move[1]>='a' && move[1]<='x' &&
       move[2]>='0' && move[2]<='9' &&
       move[3]>='a' && move[3]<='x'    ) {
        /* input move, Shogi -> normal */
        move[0] = BOARD_RGHT  -1 - (move[0]-'1') + AAA;
        move[1] = BOARD_HEIGHT-1 - (move[1]-'a') + ONE;
        move[2] = BOARD_RGHT  -1 - (move[2]-'1') + AAA;
        move[3] = BOARD_HEIGHT-1 - (move[3]-'a') + ONE;
    } else
    if(move[1]=='@' &&
       move[3]>='0' && move[3]<='9' &&
       move[2]>='a' && move[2]<='x'    ) {
        move[1] = '*';
        move[2] = BOARD_RGHT - 1 - (move[2]-AAA) + '1';
        move[3] = BOARD_HEIGHT-1 - (move[3]-ONE) + 'a';
    } else
    if(
       move[0]>='a' && move[0]<='x' &&
       move[3]>='0' && move[3]<='9' &&
       move[2]>='a' && move[2]<='x'    ) {
         /* output move, normal -> Shogi */
        move[0] = BOARD_RGHT - 1 - (move[0]-AAA) + '1';
        move[1] = BOARD_HEIGHT-1 - (move[1]-ONE) + 'a';
        move[2] = BOARD_RGHT - 1 - (move[2]-AAA) + '1';
        move[3] = BOARD_HEIGHT-1 - (move[3]-ONE) + 'a';
        if(move[4] == PieceToChar(BlackQueen)) move[4] = '+';
    }
    if (appData.debugMode) {
        fprintf(debugFP, "   out = '%s'\n", move);
    }
}

char yy_textstr[8000];

/* Parser for moves from gnuchess, ICS, or user typein box */
Boolean
ParseOneMove (char *move, int moveNum, ChessMove *moveType, int *fromX, int *fromY, int *toX, int *toY, char *promoChar)
{
    *moveType = yylexstr(moveNum, move, yy_textstr, sizeof yy_textstr);

    switch (*moveType) {
      case WhitePromotion:
      case BlackPromotion:
      case WhiteNonPromotion:
      case BlackNonPromotion:
      case NormalMove:
      case WhiteCapturesEnPassant:
      case BlackCapturesEnPassant:
      case WhiteKingSideCastle:
      case WhiteQueenSideCastle:
      case BlackKingSideCastle:
      case BlackQueenSideCastle:
      case WhiteKingSideCastleWild:
      case WhiteQueenSideCastleWild:
      case BlackKingSideCastleWild:
      case BlackQueenSideCastleWild:
      /* Code added by Tord: */
      case WhiteHSideCastleFR:
      case WhiteASideCastleFR:
      case BlackHSideCastleFR:
      case BlackASideCastleFR:
      /* End of code added by Tord */
      case IllegalMove:         /* bug or odd chess variant */
        *fromX = currentMoveString[0] - AAA;
        *fromY = currentMoveString[1] - ONE;
        *toX = currentMoveString[2] - AAA;
        *toY = currentMoveString[3] - ONE;
        *promoChar = currentMoveString[4];
        if (*fromX < BOARD_LEFT || *fromX >= BOARD_RGHT || *fromY < 0 || *fromY >= BOARD_HEIGHT ||
            *toX < BOARD_LEFT || *toX >= BOARD_RGHT || *toY < 0 || *toY >= BOARD_HEIGHT) {
    if (appData.debugMode) {
        fprintf(debugFP, "Off-board move (%d,%d)-(%d,%d)%c, type = %d\n", *fromX, *fromY, *toX, *toY, *promoChar, *moveType);
    }
            *fromX = *fromY = *toX = *toY = 0;
            return FALSE;
        }
        if (appData.testLegality) {
          return (*moveType != IllegalMove);
        } else {
          return !(*fromX == *toX && *fromY == *toY) && boards[moveNum][*fromY][*fromX] != EmptySquare &&
                        WhiteOnMove(moveNum) == (boards[moveNum][*fromY][*fromX] < BlackPawn);
        }

      case WhiteDrop:
      case BlackDrop:
        *fromX = *moveType == WhiteDrop ?
          (int) CharToPiece(ToUpper(currentMoveString[0])) :
          (int) CharToPiece(ToLower(currentMoveString[0]));
        *fromY = DROP_RANK;
        *toX = currentMoveString[2] - AAA;
        *toY = currentMoveString[3] - ONE;
        *promoChar = NULLCHAR;
        return TRUE;

      case AmbiguousMove:
      case ImpossibleMove:
      case EndOfFile:
      case ElapsedTime:
      case Comment:
      case PGNTag:
      case NAG:
      case WhiteWins:
      case BlackWins:
      case GameIsDrawn:
      default:
    if (appData.debugMode) {
        fprintf(debugFP, "Impossible move %s, type = %d\n", currentMoveString, *moveType);
    }
        /* bug? */
        *fromX = *fromY = *toX = *toY = 0;
        *promoChar = NULLCHAR;
        return FALSE;
    }
}

Boolean pushed = FALSE;
char *lastParseAttempt;

void
ParsePV (char *pv, Boolean storeComments, Boolean atEnd)
{ // Parse a string of PV moves, and append to current game, behind forwardMostMove
  int fromX, fromY, toX, toY; char promoChar;
  ChessMove moveType;
  Boolean valid;
  int nr = 0;

  if (gameMode == AnalyzeMode && currentMove < forwardMostMove) {
    PushInner(currentMove, forwardMostMove); // [HGM] engine might not be thinking on forwardMost position!
    pushed = TRUE;
  }
  endPV = forwardMostMove;
  do {
    while(*pv == ' ' || *pv == '\n' || *pv == '\t') pv++; // must still read away whitespace
    if(nr == 0 && !storeComments && *pv == '(') pv++; // first (ponder) move can be in parentheses
    lastParseAttempt = pv;
    valid = ParseOneMove(pv, endPV, &moveType, &fromX, &fromY, &toX, &toY, &promoChar);
    if(!valid && nr == 0 &&
       ParseOneMove(pv, endPV-1, &moveType, &fromX, &fromY, &toX, &toY, &promoChar)){
        nr++; moveType = Comment; // First move has been played; kludge to make sure we continue
        // Hande case where played move is different from leading PV move
        CopyBoard(boards[endPV+1], boards[endPV-1]); // tentatively unplay last game move
        CopyBoard(boards[endPV+2], boards[endPV-1]); // and play first move of PV
        ApplyMove(fromX, fromY, toX, toY, promoChar, boards[endPV+2]);
        if(!CompareBoards(boards[endPV], boards[endPV+2])) {
          endPV += 2; // if position different, keep this
          moveList[endPV-1][0] = fromX + AAA;
          moveList[endPV-1][1] = fromY + ONE;
          moveList[endPV-1][2] = toX + AAA;
          moveList[endPV-1][3] = toY + ONE;
          parseList[endPV-1][0] = NULLCHAR;
          safeStrCpy(moveList[endPV-2], "_0_0", sizeof(moveList[endPV-2])/sizeof(moveList[endPV-2][0])); // suppress premove highlight on takeback move
        }
      }
    pv = strstr(pv, yy_textstr) + strlen(yy_textstr); // skip what we parsed
    if(nr == 0 && !storeComments && *pv == ')') pv++; // closing parenthesis of ponder move;
    if(moveType == Comment && storeComments) AppendComment(endPV, yy_textstr, FALSE);
    if(moveType == Comment || moveType == NAG || moveType == ElapsedTime) {
        valid++; // allow comments in PV
        continue;
    }
    nr++;
    if(endPV+1 > framePtr) break; // no space, truncate
    if(!valid) break;
    endPV++;
    CopyBoard(boards[endPV], boards[endPV-1]);
    ApplyMove(fromX, fromY, toX, toY, promoChar, boards[endPV]);
    CoordsToComputerAlgebraic(fromY, fromX, toY, toX, promoChar, moveList[endPV - 1]);
    strncat(moveList[endPV-1], "\n", MOVE_LEN);
    CoordsToAlgebraic(boards[endPV - 1],
                             PosFlags(endPV - 1),
                             fromY, fromX, toY, toX, promoChar,
                             parseList[endPV - 1]);
  } while(valid);
  if(atEnd == 2) return; // used hidden, for PV conversion
  currentMove = (atEnd || endPV == forwardMostMove) ? endPV : forwardMostMove + 1;
  if(currentMove == forwardMostMove) ClearPremoveHighlights(); else
  SetPremoveHighlights(moveList[currentMove-1][0]-AAA, moveList[currentMove-1][1]-ONE,
                       moveList[currentMove-1][2]-AAA, moveList[currentMove-1][3]-ONE);
  DrawPosition(TRUE, boards[currentMove]);
}

int
MultiPV (ChessProgramState *cps)
{       // check if engine supports MultiPV, and if so, return the number of the option that sets it
        int i;
        for(i=0; i<cps->nrOptions; i++)
            if(!strcmp(cps->option[i].name, "MultiPV") && cps->option[i].type == Spin)
                return i;
        return -1;
}

Boolean
LoadMultiPV (int x, int y, char *buf, int index, int *start, int *end)
{
        int startPV, multi, lineStart, origIndex = index;
        char *p, buf2[MSG_SIZ];

        if(index < 0 || index >= strlen(buf)) return FALSE; // sanity
        lastX = x; lastY = y;
        while(index > 0 && buf[index-1] != '\n') index--; // beginning of line
        lineStart = startPV = index;
        while(buf[index] != '\n') if(buf[index++] == '\t') startPV = index;
        if(index == startPV && (p = StrCaseStr(buf+index, "PV="))) startPV = p - buf + 3;
        index = startPV;
        do{ while(buf[index] && buf[index] != '\n') index++;
        } while(buf[index] == '\n' && buf[index+1] == '\\' && buf[index+2] == ' ' && index++); // join kibitzed PV continuation line
        buf[index] = 0;
        if(lineStart == 0 && gameMode == AnalyzeMode && (multi = MultiPV(&first)) >= 0) {
                int n = first.option[multi].value;
                if(origIndex > 17 && origIndex < 24) { if(n>1) n--; } else if(origIndex > index - 6) n++;
                snprintf(buf2, MSG_SIZ, "option MultiPV=%d\n", n);
                if(first.option[multi].value != n) SendToProgram(buf2, &first);
                first.option[multi].value = n;
                *start = *end = 0;
                return FALSE;
        }
        ParsePV(buf+startPV, FALSE, gameMode != AnalyzeMode);
        *start = startPV; *end = index-1;
        return TRUE;
}

char *
PvToSAN (char *pv)
{
        static char buf[10*MSG_SIZ];
        int i, k=0, savedEnd=endPV, saveFMM = forwardMostMove;
        *buf = NULLCHAR;
        if(forwardMostMove < endPV) PushInner(forwardMostMove, endPV);
        ParsePV(pv, FALSE, 2); // this appends PV to game, suppressing any display of it
        for(i = forwardMostMove; i<endPV; i++){
            if(i&1) snprintf(buf+k, 10*MSG_SIZ-k, "%s ", parseList[i]);
            else    snprintf(buf+k, 10*MSG_SIZ-k, "%d. %s ", i/2 + 1, parseList[i]);
            k += strlen(buf+k);
        }
        snprintf(buf+k, 10*MSG_SIZ-k, "%s", lastParseAttempt); // if we ran into stuff that could not be parsed, print it verbatim
        if(forwardMostMove < savedEnd) { PopInner(0); forwardMostMove = saveFMM; } // PopInner would set fmm to endPV!
        endPV = savedEnd;
        return buf;
}

Boolean
LoadPV (int x, int y)
{ // called on right mouse click to load PV
  int which = gameMode == TwoMachinesPlay && (WhiteOnMove(forwardMostMove) == (second.twoMachinesColor[0] == 'w'));
  lastX = x; lastY = y;
  ParsePV(lastPV[which], FALSE, TRUE); // load the PV of the thinking engine in the boards array.
  return TRUE;
}

void
UnLoadPV ()
{
  int oldFMM = forwardMostMove; // N.B.: this was currentMove before PV was loaded!
  if(endPV < 0) return;
  endPV = -1;
  if(gameMode == AnalyzeMode && currentMove > forwardMostMove) {
        Boolean saveAnimate = appData.animate;
        if(pushed) {
            if(shiftKey && storedGames < MAX_VARIATIONS-2) { // wants to start variation, and there is space
                if(storedGames == 1) GreyRevert(FALSE);      // we already pushed the tail, so just make it official
            } else storedGames--; // abandon shelved tail of original game
        }
        pushed = FALSE;
        forwardMostMove = currentMove;
        currentMove = oldFMM;
        appData.animate = FALSE;
        ToNrEvent(forwardMostMove);
        appData.animate = saveAnimate;
  }
  currentMove = forwardMostMove;
  if(pushed) { PopInner(0); pushed = FALSE; } // restore shelved game continuation
  ClearPremoveHighlights();
  DrawPosition(TRUE, boards[currentMove]);
}

void
MovePV (int x, int y, int h)
{ // step through PV based on mouse coordinates (called on mouse move)
  int margin = h>>3, step = 0, threshold = (pieceSweep == EmptySquare ? 10 : 15);

  // we must somehow check if right button is still down (might be released off board!)
  if(endPV < 0 && pieceSweep == EmptySquare) return; // needed in XBoard because lastX/Y is shared :-(
  if(abs(x - lastX) < threshold && abs(y - lastY) < threshold) return;
  if( y > lastY + 2 ) step = -1; else if(y < lastY - 2) step = 1;
  if(!step) return;
  lastX = x; lastY = y;

  if(pieceSweep != EmptySquare) { NextPiece(step); return; }
  if(endPV < 0) return;
  if(y < margin) step = 1; else
  if(y > h - margin) step = -1;
  if(currentMove + step > endPV || currentMove + step < forwardMostMove) step = 0;
  currentMove += step;
  if(currentMove == forwardMostMove) ClearPremoveHighlights(); else
  SetPremoveHighlights(moveList[currentMove-1][0]-AAA, moveList[currentMove-1][1]-ONE,
                       moveList[currentMove-1][2]-AAA, moveList[currentMove-1][3]-ONE);
  DrawPosition(FALSE, boards[currentMove]);
}


// [HGM] shuffle: a general way to suffle opening setups, applicable to arbitrary variants.
// All positions will have equal probability, but the current method will not provide a unique
// numbering scheme for arrays that contain 3 or more pieces of the same kind.
#define DARK 1
#define LITE 2
#define ANY 3

int squaresLeft[4];
int piecesLeft[(int)BlackPawn];
int seed, nrOfShuffles;

void
GetPositionNumber ()
{       // sets global variable seed
        int i;

        seed = appData.defaultFrcPosition;
        if(seed < 0) { // randomize based on time for negative FRC position numbers
                for(i=0; i<50; i++) seed += random();
                seed = random() ^ random() >> 8 ^ random() << 8;
                if(seed<0) seed = -seed;
        }
}

int
put (Board board, int pieceType, int rank, int n, int shade)
// put the piece on the (n-1)-th empty squares of the given shade
{
        int i;

        for(i=BOARD_LEFT; i<BOARD_RGHT; i++) {
                if( (((i-BOARD_LEFT)&1)+1) & shade && board[rank][i] == EmptySquare && n-- == 0) {
                        board[rank][i] = (ChessSquare) pieceType;
                        squaresLeft[((i-BOARD_LEFT)&1) + 1]--;
                        squaresLeft[ANY]--;
                        piecesLeft[pieceType]--;
                        return i;
                }
        }
        return -1;
}


void
AddOnePiece (Board board, int pieceType, int rank, int shade)
// calculate where the next piece goes, (any empty square), and put it there
{
        int i;

        i = seed % squaresLeft[shade];
        nrOfShuffles *= squaresLeft[shade];
        seed /= squaresLeft[shade];
        put(board, pieceType, rank, i, shade);
}

void
AddTwoPieces (Board board, int pieceType, int rank)
// calculate where the next 2 identical pieces go, (any empty square), and put it there
{
        int i, n=squaresLeft[ANY], j=n-1, k;

        k = n*(n-1)/2; // nr of possibilities, not counting permutations
        i = seed % k;  // pick one
        nrOfShuffles *= k;
        seed /= k;
        while(i >= j) i -= j--;
        j = n - 1 - j; i += j;
        put(board, pieceType, rank, j, ANY);
        put(board, pieceType, rank, i, ANY);
}

void
SetUpShuffle (Board board, int number)
{
        int i, p, first=1;

        GetPositionNumber(); nrOfShuffles = 1;

        squaresLeft[DARK] = (BOARD_RGHT - BOARD_LEFT + 1)/2;
        squaresLeft[ANY]  = BOARD_RGHT - BOARD_LEFT;
        squaresLeft[LITE] = squaresLeft[ANY] - squaresLeft[DARK];

        for(p = 0; p<=(int)WhiteKing; p++) piecesLeft[p] = 0;

        for(i=BOARD_LEFT; i<BOARD_RGHT; i++) { // count pieces and clear board
            p = (int) board[0][i];
            if(p < (int) BlackPawn) piecesLeft[p] ++;
            board[0][i] = EmptySquare;
        }

        if(PosFlags(0) & F_ALL_CASTLE_OK) {
            // shuffles restricted to allow normal castling put KRR first
            if(piecesLeft[(int)WhiteKing]) // King goes rightish of middle
                put(board, WhiteKing, 0, (gameInfo.boardWidth+1)/2, ANY);
            else if(piecesLeft[(int)WhiteUnicorn]) // in Knightmate Unicorn castles
                put(board, WhiteUnicorn, 0, (gameInfo.boardWidth+1)/2, ANY);
            if(piecesLeft[(int)WhiteRook]) // First supply a Rook for K-side castling
                put(board, WhiteRook, 0, gameInfo.boardWidth-2, ANY);
            if(piecesLeft[(int)WhiteRook]) // Then supply a Rook for Q-side castling
                put(board, WhiteRook, 0, 0, ANY);
            // in variants with super-numerary Kings and Rooks, we leave these for the shuffle
        }

        if(((BOARD_RGHT-BOARD_LEFT) & 1) == 0)
            // only for even boards make effort to put pairs of colorbound pieces on opposite colors
            for(p = (int) WhiteKing; p > (int) WhitePawn; p--) {
                if(p != (int) WhiteBishop && p != (int) WhiteFerz && p != (int) WhiteAlfil) continue;
                while(piecesLeft[p] >= 2) {
                    AddOnePiece(board, p, 0, LITE);
                    AddOnePiece(board, p, 0, DARK);
                }
                // Odd color-bound pieces are shuffled with the rest (to not run out of paired squares)
            }

        for(p = (int) WhiteKing - 2; p > (int) WhitePawn; p--) {
            // Remaining pieces (non-colorbound, or odd color bound) can be put anywhere
            // but we leave King and Rooks for last, to possibly obey FRC restriction
            if(p == (int)WhiteRook) continue;
            while(piecesLeft[p] >= 2) AddTwoPieces(board, p, 0); // add in pairs, for not counting permutations
            if(piecesLeft[p]) AddOnePiece(board, p, 0, ANY);     // add the odd piece
        }

        // now everything is placed, except perhaps King (Unicorn) and Rooks

        if(PosFlags(0) & F_FRC_TYPE_CASTLING) {
            // Last King gets castling rights
            while(piecesLeft[(int)WhiteUnicorn]) {
                i = put(board, WhiteUnicorn, 0, piecesLeft[(int)WhiteRook]/2, ANY);
                initialRights[2]  = initialRights[5]  = board[CASTLING][2] = board[CASTLING][5] = i;
            }

            while(piecesLeft[(int)WhiteKing]) {
                i = put(board, WhiteKing, 0, piecesLeft[(int)WhiteRook]/2, ANY);
                initialRights[2]  = initialRights[5]  = board[CASTLING][2] = board[CASTLING][5] = i;
            }


        } else {
            while(piecesLeft[(int)WhiteKing])    AddOnePiece(board, WhiteKing, 0, ANY);
            while(piecesLeft[(int)WhiteUnicorn]) AddOnePiece(board, WhiteUnicorn, 0, ANY);
        }

        // Only Rooks can be left; simply place them all
        while(piecesLeft[(int)WhiteRook]) {
                i = put(board, WhiteRook, 0, 0, ANY);
                if(PosFlags(0) & F_FRC_TYPE_CASTLING) { // first and last Rook get FRC castling rights
                        if(first) {
                                first=0;
                                initialRights[1]  = initialRights[4]  = board[CASTLING][1] = board[CASTLING][4] = i;
                        }
                        initialRights[0]  = initialRights[3]  = board[CASTLING][0] = board[CASTLING][3] = i;
                }
        }
        for(i=BOARD_LEFT; i<BOARD_RGHT; i++) { // copy black from white
            board[BOARD_HEIGHT-1][i] =  (int) board[0][i] < BlackPawn ? WHITE_TO_BLACK board[0][i] : EmptySquare;
        }

        if(number >= 0) appData.defaultFrcPosition %= nrOfShuffles; // normalize
}

int
SetCharTable (char *table, const char * map)
/* [HGM] moved here from winboard.c because of its general usefulness */
/*       Basically a safe strcpy that uses the last character as King */
{
    int result = FALSE; int NrPieces;

    if( map != NULL && (NrPieces=strlen(map)) <= (int) EmptySquare
                    && NrPieces >= 12 && !(NrPieces&1)) {
        int i; /* [HGM] Accept even length from 12 to 34 */

        for( i=0; i<(int) EmptySquare; i++ ) table[i] = '.';
        for( i=0; i<NrPieces/2-1; i++ ) {
            table[i] = map[i];
            table[i + (int)BlackPawn - (int) WhitePawn] = map[i+NrPieces/2];
        }
        table[(int) WhiteKing]  = map[NrPieces/2-1];
        table[(int) BlackKing]  = map[NrPieces-1];

        result = TRUE;
    }

    return result;
}

void
Prelude (Board board)
{       // [HGM] superchess: random selection of exo-pieces
        int i, j, k; ChessSquare p;
        static ChessSquare exoPieces[4] = { WhiteAngel, WhiteMarshall, WhiteSilver, WhiteLance };

        GetPositionNumber(); // use FRC position number

        if(appData.pieceToCharTable != NULL) { // select pieces to participate from given char table
            SetCharTable(pieceToChar, appData.pieceToCharTable);
            for(i=(int)WhiteQueen+1, j=0; i<(int)WhiteKing && j<4; i++)
                if(PieceToChar((ChessSquare)i) != '.') exoPieces[j++] = (ChessSquare) i;
        }

        j = seed%4;                 seed /= 4;
        p = board[0][BOARD_LEFT+j];   board[0][BOARD_LEFT+j] = EmptySquare; k = PieceToNumber(p);
        board[k][BOARD_WIDTH-1] = p;  board[k][BOARD_WIDTH-2]++;
        board[BOARD_HEIGHT-1-k][0] = WHITE_TO_BLACK p;  board[BOARD_HEIGHT-1-k][1]++;
        j = seed%3 + (seed%3 >= j); seed /= 3;
        p = board[0][BOARD_LEFT+j];   board[0][BOARD_LEFT+j] = EmptySquare; k = PieceToNumber(p);
        board[k][BOARD_WIDTH-1] = p;  board[k][BOARD_WIDTH-2]++;
        board[BOARD_HEIGHT-1-k][0] = WHITE_TO_BLACK p;  board[BOARD_HEIGHT-1-k][1]++;
        j = seed%3;                 seed /= 3;
        p = board[0][BOARD_LEFT+j+5]; board[0][BOARD_LEFT+j+5] = EmptySquare; k = PieceToNumber(p);
        board[k][BOARD_WIDTH-1] = p;  board[k][BOARD_WIDTH-2]++;
        board[BOARD_HEIGHT-1-k][0] = WHITE_TO_BLACK p;  board[BOARD_HEIGHT-1-k][1]++;
        j = seed%2 + (seed%2 >= j); seed /= 2;
        p = board[0][BOARD_LEFT+j+5]; board[0][BOARD_LEFT+j+5] = EmptySquare; k = PieceToNumber(p);
        board[k][BOARD_WIDTH-1] = p;  board[k][BOARD_WIDTH-2]++;
        board[BOARD_HEIGHT-1-k][0] = WHITE_TO_BLACK p;  board[BOARD_HEIGHT-1-k][1]++;
        j = seed%4; seed /= 4; put(board, exoPieces[3],    0, j, ANY);
        j = seed%3; seed /= 3; put(board, exoPieces[2],   0, j, ANY);
        j = seed%2; seed /= 2; put(board, exoPieces[1], 0, j, ANY);
        put(board, exoPieces[0],    0, 0, ANY);
        for(i=BOARD_LEFT; i<BOARD_RGHT; i++) board[BOARD_HEIGHT-1][i] = WHITE_TO_BLACK board[0][i];
}

void
InitPosition (int redraw)
{
    ChessSquare (* pieces)[BOARD_FILES];
    int i, j, pawnRow, overrule,
    oldx = gameInfo.boardWidth,
    oldy = gameInfo.boardHeight,
    oldh = gameInfo.holdingsWidth;
    static int oldv;

    if(appData.icsActive) shuffleOpenings = FALSE; // [HGM] shuffle: in ICS mode, only shuffle on ICS request

    /* [AS] Initialize pv info list [HGM] and game status */
    {
        for( i=0; i<=framePtr; i++ ) { // [HGM] vari: spare saved variations
            pvInfoList[i].depth = 0;
            boards[i][EP_STATUS] = EP_NONE;
            for( j=0; j<BOARD_FILES-2; j++ ) boards[i][CASTLING][j] = NoRights;
        }

        initialRulePlies = 0; /* 50-move counter start */

        castlingRank[0] = castlingRank[1] = castlingRank[2] = 0;
        castlingRank[3] = castlingRank[4] = castlingRank[5] = BOARD_HEIGHT-1;
    }


    /* [HGM] logic here is completely changed. In stead of full positions */
    /* the initialized data only consist of the two backranks. The switch */
    /* selects which one we will use, which is than copied to the Board   */
    /* initialPosition, which for the rest is initialized by Pawns and    */
    /* empty squares. This initial position is then copied to boards[0],  */
    /* possibly after shuffling, so that it remains available.            */

    gameInfo.holdingsWidth = 0; /* default board sizes */
    gameInfo.boardWidth    = 8;
    gameInfo.boardHeight   = 8;
    gameInfo.holdingsSize  = 0;
    nrCastlingRights = -1; /* [HGM] Kludge to indicate default should be used */
    for(i=0; i<BOARD_FILES-2; i++)
      initialPosition[CASTLING][i] = initialRights[i] = NoRights; /* but no rights yet */
    initialPosition[EP_STATUS] = EP_NONE;
    SetCharTable(pieceToChar, "PNBRQ...........Kpnbrq...........k");
    if(startVariant == gameInfo.variant) // [HGM] nicks: enable nicknames in original variant
         SetCharTable(pieceNickName, appData.pieceNickNames);
    else SetCharTable(pieceNickName, "............");
    pieces = FIDEArray;

    switch (gameInfo.variant) {
    case VariantFischeRandom:
      shuffleOpenings = TRUE;
    default:
      break;
    case VariantShatranj:
      pieces = ShatranjArray;
      nrCastlingRights = 0;
      SetCharTable(pieceToChar, "PN.R.QB...Kpn.r.qb...k");
      break;
    case VariantMakruk:
      pieces = makrukArray;
      nrCastlingRights = 0;
      startedFromSetupPosition = TRUE;
      SetCharTable(pieceToChar, "PN.R.M....SKpn.r.m....sk");
      break;
    case VariantTwoKings:
      pieces = twoKingsArray;
      break;
    case VariantGrand:
      pieces = GrandArray;
      nrCastlingRights = 0;
      SetCharTable(pieceToChar, "PNBRQ..ACKpnbrq..ack");
      gameInfo.boardWidth = 10;
      gameInfo.boardHeight = 10;
      gameInfo.holdingsSize = 7;
      break;
    case VariantCapaRandom:
      shuffleOpenings = TRUE;
    case VariantCapablanca:
      pieces = CapablancaArray;
      gameInfo.boardWidth = 10;
      SetCharTable(pieceToChar, "PNBRQ..ACKpnbrq..ack");
      break;
    case VariantGothic:
      pieces = GothicArray;
      gameInfo.boardWidth = 10;
      SetCharTable(pieceToChar, "PNBRQ..ACKpnbrq..ack");
      break;
    case VariantSChess:
      SetCharTable(pieceToChar, "PNBRQ..HEKpnbrq..hek");
      gameInfo.holdingsSize = 7;
      break;
    case VariantJanus:
      pieces = JanusArray;
      gameInfo.boardWidth = 10;
      SetCharTable(pieceToChar, "PNBRQ..JKpnbrq..jk");
      nrCastlingRights = 6;
        initialPosition[CASTLING][0] = initialRights[0] = BOARD_RGHT-1;
        initialPosition[CASTLING][1] = initialRights[1] = BOARD_LEFT;
        initialPosition[CASTLING][2] = initialRights[2] =(BOARD_WIDTH-1)>>1;
        initialPosition[CASTLING][3] = initialRights[3] = BOARD_RGHT-1;
        initialPosition[CASTLING][4] = initialRights[4] = BOARD_LEFT;
        initialPosition[CASTLING][5] = initialRights[5] =(BOARD_WIDTH-1)>>1;
      break;
    case VariantFalcon:
      pieces = FalconArray;
      gameInfo.boardWidth = 10;
      SetCharTable(pieceToChar, "PNBRQ.............FKpnbrq.............fk");
      break;
    case VariantXiangqi:
      pieces = XiangqiArray;
      gameInfo.boardWidth  = 9;
      gameInfo.boardHeight = 10;
      nrCastlingRights = 0;
      SetCharTable(pieceToChar, "PH.R.AE..K.C.ph.r.ae..k.c.");
      break;
    case VariantShogi:
      pieces = ShogiArray;
      gameInfo.boardWidth  = 9;
      gameInfo.boardHeight = 9;
      gameInfo.holdingsSize = 7;
      nrCastlingRights = 0;
      SetCharTable(pieceToChar, "PNBRLS...G.++++++Kpnbrls...g.++++++k");
      break;
    case VariantCourier:
      pieces = CourierArray;
      gameInfo.boardWidth  = 12;
      nrCastlingRights = 0;
      SetCharTable(pieceToChar, "PNBR.FE..WMKpnbr.fe..wmk");
      break;
    case VariantKnightmate:
      pieces = KnightmateArray;
      SetCharTable(pieceToChar, "P.BRQ.....M.........K.p.brq.....m.........k.");
      break;
    case VariantSpartan:
      pieces = SpartanArray;
      SetCharTable(pieceToChar, "PNBRQ................K......lwg.....c...h..k");
      break;
    case VariantFairy:
      pieces = fairyArray;
      SetCharTable(pieceToChar, "PNBRQFEACWMOHIJGDVLSUKpnbrqfeacwmohijgdvlsuk");
      break;
    case VariantGreat:
      pieces = GreatArray;
      gameInfo.boardWidth = 10;
      SetCharTable(pieceToChar, "PN....E...S..HWGMKpn....e...s..hwgmk");
      gameInfo.holdingsSize = 8;
      break;
    case VariantSuper:
      pieces = FIDEArray;
      SetCharTable(pieceToChar, "PNBRQ..SE.......V.AKpnbrq..se.......v.ak");
      gameInfo.holdingsSize = 8;
      startedFromSetupPosition = TRUE;
      break;
    case VariantCrazyhouse:
    case VariantBughouse:
      pieces = FIDEArray;
      SetCharTable(pieceToChar, "PNBRQ.......~~~~Kpnbrq.......~~~~k");
      gameInfo.holdingsSize = 5;
      break;
    case VariantWildCastle:
      pieces = FIDEArray;
      /* !!?shuffle with kings guaranteed to be on d or e file */
      shuffleOpenings = 1;
      break;
    case VariantNoCastle:
      pieces = FIDEArray;
      nrCastlingRights = 0;
      /* !!?unconstrained back-rank shuffle */
      shuffleOpenings = 1;
      break;
    }

    overrule = 0;
    if(appData.NrFiles >= 0) {
        if(gameInfo.boardWidth != appData.NrFiles) overrule++;
        gameInfo.boardWidth = appData.NrFiles;
    }
    if(appData.NrRanks >= 0) {
        gameInfo.boardHeight = appData.NrRanks;
    }
    if(appData.holdingsSize >= 0) {
        i = appData.holdingsSize;
        if(i > gameInfo.boardHeight) i = gameInfo.boardHeight;
        gameInfo.holdingsSize = i;
    }
    if(gameInfo.holdingsSize) gameInfo.holdingsWidth = 2;
    if(BOARD_HEIGHT > BOARD_RANKS || BOARD_WIDTH > BOARD_FILES)
        DisplayFatalError(_("Recompile to support this BOARD_RANKS or BOARD_FILES!"), 0, 2);

    pawnRow = gameInfo.boardHeight - 7; /* seems to work in all common variants */
    if(pawnRow < 1) pawnRow = 1;
    if(gameInfo.variant == VariantMakruk || gameInfo.variant == VariantGrand) pawnRow = 2;

    /* User pieceToChar list overrules defaults */
    if(appData.pieceToCharTable != NULL)
        SetCharTable(pieceToChar, appData.pieceToCharTable);

    for( j=0; j<BOARD_WIDTH; j++ ) { ChessSquare s = EmptySquare;

        if(j==BOARD_LEFT-1 || j==BOARD_RGHT)
            s = (ChessSquare) 0; /* account holding counts in guard band */
        for( i=0; i<BOARD_HEIGHT; i++ )
            initialPosition[i][j] = s;

        if(j < BOARD_LEFT || j >= BOARD_RGHT || overrule) continue;
        initialPosition[gameInfo.variant == VariantGrand][j] = pieces[0][j-gameInfo.holdingsWidth];
        initialPosition[pawnRow][j] = WhitePawn;
        initialPosition[BOARD_HEIGHT-pawnRow-1][j] = gameInfo.variant == VariantSpartan ? BlackLance : BlackPawn;
        if(gameInfo.variant == VariantXiangqi) {
            if(j&1) {
                initialPosition[pawnRow][j] =
                initialPosition[BOARD_HEIGHT-pawnRow-1][j] = EmptySquare;
                if(j==BOARD_LEFT+1 || j>=BOARD_RGHT-2) {
                   initialPosition[2][j] = WhiteCannon;
                   initialPosition[BOARD_HEIGHT-3][j] = BlackCannon;
                }
            }
        }
        if(gameInfo.variant == VariantGrand) {
            if(j==BOARD_LEFT || j>=BOARD_RGHT-1) {
               initialPosition[0][j] = WhiteRook;
               initialPosition[BOARD_HEIGHT-1][j] = BlackRook;
            }
        }
        initialPosition[BOARD_HEIGHT-1-(gameInfo.variant == VariantGrand)][j] =  pieces[1][j-gameInfo.holdingsWidth];
    }
    if( (gameInfo.variant == VariantShogi) && !overrule ) {

            j=BOARD_LEFT+1;
            initialPosition[1][j] = WhiteBishop;
            initialPosition[BOARD_HEIGHT-2][j] = BlackRook;
            j=BOARD_RGHT-2;
            initialPosition[1][j] = WhiteRook;
            initialPosition[BOARD_HEIGHT-2][j] = BlackBishop;
    }

    if( nrCastlingRights == -1) {
        /* [HGM] Build normal castling rights (must be done after board sizing!) */
        /*       This sets default castling rights from none to normal corners   */
        /* Variants with other castling rights must set them themselves above    */
        nrCastlingRights = 6;

        initialPosition[CASTLING][0] = initialRights[0] = BOARD_RGHT-1;
        initialPosition[CASTLING][1] = initialRights[1] = BOARD_LEFT;
        initialPosition[CASTLING][2] = initialRights[2] = BOARD_WIDTH>>1;
        initialPosition[CASTLING][3] = initialRights[3] = BOARD_RGHT-1;
        initialPosition[CASTLING][4] = initialRights[4] = BOARD_LEFT;
        initialPosition[CASTLING][5] = initialRights[5] = BOARD_WIDTH>>1;
     }

     if(gameInfo.variant == VariantSuper) Prelude(initialPosition);
     if(gameInfo.variant == VariantGreat) { // promotion commoners
        initialPosition[PieceToNumber(WhiteMan)][BOARD_WIDTH-1] = WhiteMan;
        initialPosition[PieceToNumber(WhiteMan)][BOARD_WIDTH-2] = 9;
        initialPosition[BOARD_HEIGHT-1-PieceToNumber(WhiteMan)][0] = BlackMan;
        initialPosition[BOARD_HEIGHT-1-PieceToNumber(WhiteMan)][1] = 9;
     }
     if( gameInfo.variant == VariantSChess ) {
      initialPosition[1][0] = BlackMarshall;
      initialPosition[2][0] = BlackAngel;
      initialPosition[6][BOARD_WIDTH-1] = WhiteMarshall;
      initialPosition[5][BOARD_WIDTH-1] = WhiteAngel;
      initialPosition[1][1] = initialPosition[2][1] = 
      initialPosition[6][BOARD_WIDTH-2] = initialPosition[5][BOARD_WIDTH-2] = 1;
     }
  if (appData.debugMode) {
    fprintf(debugFP, "shuffleOpenings = %d\n", shuffleOpenings);
  }
    if(shuffleOpenings) {
        SetUpShuffle(initialPosition, appData.defaultFrcPosition);
        startedFromSetupPosition = TRUE;
    }
    if(startedFromPositionFile) {
      /* [HGM] loadPos: use PositionFile for every new game */
      CopyBoard(initialPosition, filePosition);
      for(i=0; i<nrCastlingRights; i++)
          initialRights[i] = filePosition[CASTLING][i];
      startedFromSetupPosition = TRUE;
    }

    CopyBoard(boards[0], initialPosition);

    if(oldx != gameInfo.boardWidth ||
       oldy != gameInfo.boardHeight ||
       oldv != gameInfo.variant ||
       oldh != gameInfo.holdingsWidth
                                         )
            InitDrawingSizes(-2 ,0);

    oldv = gameInfo.variant;
    if (redraw)
      DrawPosition(TRUE, boards[currentMove]);
}

void
SendBoard (ChessProgramState *cps, int moveNum)
{
    char message[MSG_SIZ];

    if (cps->useSetboard) {
      char* fen = PositionToFEN(moveNum, cps->fenOverride);
      snprintf(message, MSG_SIZ,"setboard %s\n", fen);
      SendToProgram(message, cps);
      free(fen);

    } else {
      ChessSquare *bp;
      int i, j, left=0, right=BOARD_WIDTH;
      /* Kludge to set black to move, avoiding the troublesome and now
       * deprecated "black" command.
       */
      if (!WhiteOnMove(moveNum)) // [HGM] but better a deprecated command than an illegal move...
        SendToProgram(boards[0][1][BOARD_LEFT] == WhitePawn ? "a2a3\n" : "black\n", cps);

      if(!cps->extendedEdit) left = BOARD_LEFT, right = BOARD_RGHT; // only board proper

      SendToProgram("edit\n", cps);
      SendToProgram("#\n", cps);
      for (i = BOARD_HEIGHT - 1; i >= 0; i--) {
        bp = &boards[moveNum][i][left];
        for (j = left; j < right; j++, bp++) {
          if(j == BOARD_LEFT-1 || j == BOARD_RGHT) continue;
          if ((int) *bp < (int) BlackPawn) {
            if(j == BOARD_RGHT+1)
                 snprintf(message, MSG_SIZ, "%c@%d\n", PieceToChar(*bp), bp[-1]);
            else snprintf(message, MSG_SIZ, "%c%c%c\n", PieceToChar(*bp), AAA + j, ONE + i);
            if(message[0] == '+' || message[0] == '~') {
              snprintf(message, MSG_SIZ,"%c%c%c+\n",
                        PieceToChar((ChessSquare)(DEMOTED *bp)),
                        AAA + j, ONE + i);
            }
            if(cps->alphaRank) { /* [HGM] shogi: translate coords */
                message[1] = BOARD_RGHT   - 1 - j + '1';
                message[2] = BOARD_HEIGHT - 1 - i + 'a';
            }
            SendToProgram(message, cps);
          }
        }
      }

      SendToProgram("c\n", cps);
      for (i = BOARD_HEIGHT - 1; i >= 0; i--) {
        bp = &boards[moveNum][i][left];
        for (j = left; j < right; j++, bp++) {
          if(j == BOARD_LEFT-1 || j == BOARD_RGHT) continue;
          if (((int) *bp != (int) EmptySquare)
              && ((int) *bp >= (int) BlackPawn)) {
            if(j == BOARD_LEFT-2)
                 snprintf(message, MSG_SIZ, "%c@%d\n", ToUpper(PieceToChar(*bp)), bp[1]);
            else snprintf(message,MSG_SIZ, "%c%c%c\n", ToUpper(PieceToChar(*bp)),
                    AAA + j, ONE + i);
            if(message[0] == '+' || message[0] == '~') {
              snprintf(message, MSG_SIZ,"%c%c%c+\n",
                        PieceToChar((ChessSquare)(DEMOTED *bp)),
                        AAA + j, ONE + i);
            }
            if(cps->alphaRank) { /* [HGM] shogi: translate coords */
                message[1] = BOARD_RGHT   - 1 - j + '1';
                message[2] = BOARD_HEIGHT - 1 - i + 'a';
            }
            SendToProgram(message, cps);
          }
        }
      }

      SendToProgram(".\n", cps);
    }
    setboardSpoiledMachineBlack = 0; /* [HGM] assume WB 4.2.7 already solves this after sending setboard */
}

ChessSquare
DefaultPromoChoice (int white)
{
    ChessSquare result;
    if(gameInfo.variant == VariantShatranj || gameInfo.variant == VariantCourier || gameInfo.variant == VariantMakruk)
        result = WhiteFerz; // no choice
    else if(gameInfo.variant == VariantSuicide || gameInfo.variant == VariantGiveaway)
        result= WhiteKing; // in Suicide Q is the last thing we want
    else if(gameInfo.variant == VariantSpartan)
        result = white ? WhiteQueen : WhiteAngel;
    else result = WhiteQueen;
    if(!white) result = WHITE_TO_BLACK result;
    return result;
}

static int autoQueen; // [HGM] oneclick

int
HasPromotionChoice (int fromX, int fromY, int toX, int toY, char *promoChoice, int sweepSelect)
{
    /* [HGM] rewritten IsPromotion to only flag promotions that offer a choice */
    /* [HGM] add Shogi promotions */
    int promotionZoneSize=1, highestPromotingPiece = (int)WhitePawn;
    ChessSquare piece;
    ChessMove moveType;
    Boolean premove;

    if(fromX < BOARD_LEFT || fromX >= BOARD_RGHT) return FALSE; // drop
    if(toX   < BOARD_LEFT || toX   >= BOARD_RGHT) return FALSE; // move into holdings

    if(gameMode == EditPosition || gameInfo.variant == VariantXiangqi || // no promotions
      !(fromX >=0 && fromY >= 0 && toX >= 0 && toY >= 0) ) // invalid move
        return FALSE;

    piece = boards[currentMove][fromY][fromX];
    if(gameInfo.variant == VariantShogi) {
        promotionZoneSize = BOARD_HEIGHT/3;
        highestPromotingPiece = (int)WhiteFerz;
    } else if(gameInfo.variant == VariantMakruk || gameInfo.variant == VariantGrand) {
        promotionZoneSize = 3;
    }

    // Treat Lance as Pawn when it is not representing Amazon
    if(gameInfo.variant != VariantSuper) {
        if(piece == WhiteLance) piece = WhitePawn; else
        if(piece == BlackLance) piece = BlackPawn;
    }

    // next weed out all moves that do not touch the promotion zone at all
    if((int)piece >= BlackPawn) {
        if(toY >= promotionZoneSize && fromY >= promotionZoneSize)
             return FALSE;
        highestPromotingPiece = WHITE_TO_BLACK highestPromotingPiece;
    } else {
        if(  toY < BOARD_HEIGHT - promotionZoneSize &&
           fromY < BOARD_HEIGHT - promotionZoneSize) return FALSE;
    }

    if( (int)piece > highestPromotingPiece ) return FALSE; // non-promoting piece

    // weed out mandatory Shogi promotions
    if(gameInfo.variant == VariantShogi) {
        if(piece >= BlackPawn) {
            if(toY == 0 && piece == BlackPawn ||
               toY == 0 && piece == BlackQueen ||
               toY <= 1 && piece == BlackKnight) {
                *promoChoice = '+';
                return FALSE;
            }
        } else {
            if(toY == BOARD_HEIGHT-1 && piece == WhitePawn ||
               toY == BOARD_HEIGHT-1 && piece == WhiteQueen ||
               toY >= BOARD_HEIGHT-2 && piece == WhiteKnight) {
                *promoChoice = '+';
                return FALSE;
            }
        }
    }

    // weed out obviously illegal Pawn moves
    if(appData.testLegality  && (piece == WhitePawn || piece == BlackPawn) ) {
        if(toX > fromX+1 || toX < fromX-1) return FALSE; // wide
        if(piece == WhitePawn && toY != fromY+1) return FALSE; // deep
        if(piece == BlackPawn && toY != fromY-1) return FALSE; // deep
        if(fromX != toX && gameInfo.variant == VariantShogi) return FALSE;
        // note we are not allowed to test for valid (non-)capture, due to premove
    }

    // we either have a choice what to promote to, or (in Shogi) whether to promote
    if(gameInfo.variant == VariantShatranj || gameInfo.variant == VariantCourier || gameInfo.variant == VariantMakruk) {
        *promoChoice = PieceToChar(BlackFerz);  // no choice
        return FALSE;
    }
    // no sense asking what we must promote to if it is going to explode...
    if(gameInfo.variant == VariantAtomic && boards[currentMove][toY][toX] != EmptySquare) {
        *promoChoice = PieceToChar(BlackQueen); // Queen as good as any
        return FALSE;
    }
    // give caller the default choice even if we will not make it
    *promoChoice = ToLower(PieceToChar(defaultPromoChoice));
    if(gameInfo.variant == VariantShogi) *promoChoice = (defaultPromoChoice == piece ? '=' : '+');
    if(        sweepSelect && gameInfo.variant != VariantGreat
                           && gameInfo.variant != VariantGrand
                           && gameInfo.variant != VariantSuper) return FALSE;
    if(autoQueen) return FALSE; // predetermined

    // suppress promotion popup on illegal moves that are not premoves
    premove = gameMode == IcsPlayingWhite && !WhiteOnMove(currentMove) ||
              gameMode == IcsPlayingBlack &&  WhiteOnMove(currentMove);
    if(appData.testLegality && !premove) {
        moveType = LegalityTest(boards[currentMove], PosFlags(currentMove),
                        fromY, fromX, toY, toX, gameInfo.variant == VariantShogi ? '+' : NULLCHAR);
        if(moveType != WhitePromotion && moveType  != BlackPromotion)
            return FALSE;
    }

    return TRUE;
}

int
InPalace (int row, int column)
{   /* [HGM] for Xiangqi */
    if( (row < 3 || row > BOARD_HEIGHT-4) &&
         column < (BOARD_WIDTH + 4)/2 &&
         column > (BOARD_WIDTH - 5)/2 ) return TRUE;
    return FALSE;
}

int
PieceForSquare (int x, int y)
{
  if (x < 0 || x >= BOARD_WIDTH || y < 0 || y >= BOARD_HEIGHT)
     return -1;
  else
     return boards[currentMove][y][x];
}

int
OKToStartUserMove (int x, int y)
{
    ChessSquare from_piece;
    int white_piece;

    if (matchMode) return FALSE;
    if (gameMode == EditPosition) return TRUE;

    if (x >= 0 && y >= 0)
      from_piece = boards[currentMove][y][x];
    else
      from_piece = EmptySquare;

    if (from_piece == EmptySquare) return FALSE;

    white_piece = (int)from_piece >= (int)WhitePawn &&
      (int)from_piece < (int)BlackPawn; /* [HGM] can be > King! */

    switch (gameMode) {
      case AnalyzeFile:
      case TwoMachinesPlay:
      case EndOfGame:
        return FALSE;

      case IcsObserving:
      case IcsIdle:
        return FALSE;

      case MachinePlaysWhite:
      case IcsPlayingBlack:
        if (appData.zippyPlay) return FALSE;
        if (white_piece) {
            DisplayMoveError(_("You are playing Black"));
            return FALSE;
        }
        break;

      case MachinePlaysBlack:
      case IcsPlayingWhite:
        if (appData.zippyPlay) return FALSE;
        if (!white_piece) {
            DisplayMoveError(_("You are playing White"));
            return FALSE;
        }
        break;

      case PlayFromGameFile:
            if(!shiftKey || !appData.variations) return FALSE; // [HGM] allow starting variation in this mode
      case EditGame:
        if (!white_piece && WhiteOnMove(currentMove)) {
            DisplayMoveError(_("It is White's turn"));
            return FALSE;
        }
        if (white_piece && !WhiteOnMove(currentMove)) {
            DisplayMoveError(_("It is Black's turn"));
            return FALSE;
        }
        if (cmailMsgLoaded && (currentMove < cmailOldMove)) {
            /* Editing correspondence game history */
            /* Could disallow this or prompt for confirmation */
            cmailOldMove = -1;
        }
        break;

      case BeginningOfGame:
        if (appData.icsActive) return FALSE;
        if (!appData.noChessProgram) {
            if (!white_piece) {
                DisplayMoveError(_("You are playing White"));
                return FALSE;
            }
        }
        break;

      case Training:
        if (!white_piece && WhiteOnMove(currentMove)) {
            DisplayMoveError(_("It is White's turn"));
            return FALSE;
        }
        if (white_piece && !WhiteOnMove(currentMove)) {
            DisplayMoveError(_("It is Black's turn"));
            return FALSE;
        }
        break;

      default:
      case IcsExamining:
        break;
    }
    if (currentMove != forwardMostMove && gameMode != AnalyzeMode
        && gameMode != EditGame // [HGM] vari: treat as AnalyzeMode
        && gameMode != PlayFromGameFile // [HGM] as EditGame, with protected main line
        && gameMode != AnalyzeFile && gameMode != Training) {
        DisplayMoveError(_("Displayed position is not current"));
        return FALSE;
    }
    return TRUE;
}

Boolean
OnlyMove (int *x, int *y, Boolean captures) 
{
    DisambiguateClosure cl;
    if (appData.zippyPlay || !appData.testLegality) return FALSE;
    switch(gameMode) {
      case MachinePlaysBlack:
      case IcsPlayingWhite:
      case BeginningOfGame:
        if(!WhiteOnMove(currentMove)) return FALSE;
        break;
      case MachinePlaysWhite:
      case IcsPlayingBlack:
        if(WhiteOnMove(currentMove)) return FALSE;
        break;
      case EditGame:
        break;
      default:
        return FALSE;
    }
    cl.pieceIn = EmptySquare;
    cl.rfIn = *y;
    cl.ffIn = *x;
    cl.rtIn = -1;
    cl.ftIn = -1;
    cl.promoCharIn = NULLCHAR;
    Disambiguate(boards[currentMove], PosFlags(currentMove), &cl);
    if( cl.kind == NormalMove ||
        cl.kind == AmbiguousMove && captures && cl.captures == 1 ||
        cl.kind == WhitePromotion || cl.kind == BlackPromotion ||
        cl.kind == WhiteCapturesEnPassant || cl.kind == BlackCapturesEnPassant) {
      fromX = cl.ff;
      fromY = cl.rf;
      *x = cl.ft;
      *y = cl.rt;
      return TRUE;
    }
    if(cl.kind != ImpossibleMove) return FALSE;
    cl.pieceIn = EmptySquare;
    cl.rfIn = -1;
    cl.ffIn = -1;
    cl.rtIn = *y;
    cl.ftIn = *x;
    cl.promoCharIn = NULLCHAR;
    Disambiguate(boards[currentMove], PosFlags(currentMove), &cl);
    if( cl.kind == NormalMove ||
        cl.kind == AmbiguousMove && captures && cl.captures == 1 ||
        cl.kind == WhitePromotion || cl.kind == BlackPromotion ||
        cl.kind == WhiteCapturesEnPassant || cl.kind == BlackCapturesEnPassant) {
      fromX = cl.ff;
      fromY = cl.rf;
      *x = cl.ft;
      *y = cl.rt;
      autoQueen = TRUE; // act as if autoQueen on when we click to-square
      return TRUE;
    }
    return FALSE;
}

FILE *lastLoadGameFP = NULL, *lastLoadPositionFP = NULL;
int lastLoadGameNumber = 0, lastLoadPositionNumber = 0;
int lastLoadGameUseList = FALSE;
char lastLoadGameTitle[MSG_SIZ], lastLoadPositionTitle[MSG_SIZ];
ChessMove lastLoadGameStart = EndOfFile;

void
UserMoveEvent(int fromX, int fromY, int toX, int toY, int promoChar)
{
    ChessMove moveType;
    ChessSquare pdown, pup;

    /* Check if the user is playing in turn.  This is complicated because we
       let the user "pick up" a piece before it is his turn.  So the piece he
       tried to pick up may have been captured by the time he puts it down!
       Therefore we use the color the user is supposed to be playing in this
       test, not the color of the piece that is currently on the starting
       square---except in EditGame mode, where the user is playing both
       sides; fortunately there the capture race can't happen.  (It can
       now happen in IcsExamining mode, but that's just too bad.  The user
       will get a somewhat confusing message in that case.)
       */

    switch (gameMode) {
      case AnalyzeFile:
      case TwoMachinesPlay:
      case EndOfGame:
      case IcsObserving:
      case IcsIdle:
        /* We switched into a game mode where moves are not accepted,
           perhaps while the mouse button was down. */
        return;

      case MachinePlaysWhite:
        /* User is moving for Black */
        if (WhiteOnMove(currentMove)) {
            DisplayMoveError(_("It is White's turn"));
            return;
        }
        break;

      case MachinePlaysBlack:
        /* User is moving for White */
        if (!WhiteOnMove(currentMove)) {
            DisplayMoveError(_("It is Black's turn"));
            return;
        }
        break;

      case PlayFromGameFile:
            if(!shiftKey ||!appData.variations) return; // [HGM] only variations
      case EditGame:
      case IcsExamining:
      case BeginningOfGame:
      case AnalyzeMode:
      case Training:
        if(fromY == DROP_RANK) break; // [HGM] drop moves (entered through move type-in) are automatically assigned to side-to-move
        if ((int) boards[currentMove][fromY][fromX] >= (int) BlackPawn &&
            (int) boards[currentMove][fromY][fromX] < (int) EmptySquare) {
            /* User is moving for Black */
            if (WhiteOnMove(currentMove)) {
                DisplayMoveError(_("It is White's turn"));
                return;
            }
        } else {
            /* User is moving for White */
            if (!WhiteOnMove(currentMove)) {
                DisplayMoveError(_("It is Black's turn"));
                return;
            }
        }
        break;

      case IcsPlayingBlack:
        /* User is moving for Black */
        if (WhiteOnMove(currentMove)) {
            if (!appData.premove) {
                DisplayMoveError(_("It is White's turn"));
            } else if (toX >= 0 && toY >= 0) {
                premoveToX = toX;
                premoveToY = toY;
                premoveFromX = fromX;
                premoveFromY = fromY;
                premovePromoChar = promoChar;
                gotPremove = 1;
                if (appData.debugMode)
                    fprintf(debugFP, "Got premove: fromX %d,"
                            "fromY %d, toX %d, toY %d\n",
                            fromX, fromY, toX, toY);
            }
            return;
        }
        break;

      case IcsPlayingWhite:
        /* User is moving for White */
        if (!WhiteOnMove(currentMove)) {
            if (!appData.premove) {
                DisplayMoveError(_("It is Black's turn"));
            } else if (toX >= 0 && toY >= 0) {
                premoveToX = toX;
                premoveToY = toY;
                premoveFromX = fromX;
                premoveFromY = fromY;
                premovePromoChar = promoChar;
                gotPremove = 1;
                if (appData.debugMode)
                    fprintf(debugFP, "Got premove: fromX %d,"
                            "fromY %d, toX %d, toY %d\n",
                            fromX, fromY, toX, toY);
            }
            return;
        }
        break;

      default:
        break;

      case EditPosition:
        /* EditPosition, empty square, or different color piece;
           click-click move is possible */
        if (toX == -2 || toY == -2) {
            boards[0][fromY][fromX] = EmptySquare;
            DrawPosition(FALSE, boards[currentMove]);
            return;
        } else if (toX >= 0 && toY >= 0) {
            boards[0][toY][toX] = boards[0][fromY][fromX];
            if(fromX == BOARD_LEFT-2) { // handle 'moves' out of holdings
                if(boards[0][fromY][0] != EmptySquare) {
                    if(boards[0][fromY][1]) boards[0][fromY][1]--;
                    if(boards[0][fromY][1] == 0)  boards[0][fromY][0] = EmptySquare;
                }
            } else
            if(fromX == BOARD_RGHT+1) {
                if(boards[0][fromY][BOARD_WIDTH-1] != EmptySquare) {
                    if(boards[0][fromY][BOARD_WIDTH-2]) boards[0][fromY][BOARD_WIDTH-2]--;
                    if(boards[0][fromY][BOARD_WIDTH-2] == 0)  boards[0][fromY][BOARD_WIDTH-1] = EmptySquare;
                }
            } else
            boards[0][fromY][fromX] = EmptySquare;
            DrawPosition(FALSE, boards[currentMove]);
            return;
        }
        return;
    }

    if(toX < 0 || toY < 0) return;
    pdown = boards[currentMove][fromY][fromX];
    pup = boards[currentMove][toY][toX];

    /* [HGM] If move started in holdings, it means a drop. Convert to standard form */
    if( (fromX == BOARD_LEFT-2 || fromX == BOARD_RGHT+1) && fromY != DROP_RANK ) {
         if( pup != EmptySquare ) return;
         moveType = WhiteOnMove(currentMove) ? WhiteDrop : BlackDrop;
           if(appData.debugMode) fprintf(debugFP, "Drop move %d, curr=%d, x=%d,y=%d, p=%d\n", 
                moveType, currentMove, fromX, fromY, boards[currentMove][fromY][fromX]);
           // holdings might not be sent yet in ICS play; we have to figure out which piece belongs here
           if(fromX == 0) fromY = BOARD_HEIGHT-1 - fromY; // black holdings upside-down
           fromX = fromX ? WhitePawn : BlackPawn; // first piece type in selected holdings
           while(PieceToChar(fromX) == '.' || PieceToNumber(fromX) != fromY && fromX != (int) EmptySquare) fromX++; 
         fromY = DROP_RANK;
    }

    /* [HGM] always test for legality, to get promotion info */
    moveType = LegalityTest(boards[currentMove], PosFlags(currentMove),
                                         fromY, fromX, toY, toX, promoChar);

    if(fromY == DROP_RANK && fromX == EmptySquare && (gameMode == AnalyzeMode || gameMode == EditGame)) moveType = NormalMove;

    /* [HGM] but possibly ignore an IllegalMove result */
    if (appData.testLegality) {
        if (moveType == IllegalMove || moveType == ImpossibleMove) {
            DisplayMoveError(_("Illegal move"));
            return;
        }
    }

    FinishMove(moveType, fromX, fromY, toX, toY, promoChar);
}

/* Common tail of UserMoveEvent and DropMenuEvent */
int
FinishMove (ChessMove moveType, int fromX, int fromY, int toX, int toY, int promoChar)
{
    char *bookHit = 0;

    if((gameInfo.variant == VariantSuper || gameInfo.variant == VariantGreat || gameInfo.variant == VariantGrand) && promoChar != NULLCHAR) {
        // [HGM] superchess: suppress promotions to non-available piece (but P always allowed)
        int k = PieceToNumber(CharToPiece(ToUpper(promoChar)));
        if(WhiteOnMove(currentMove)) {
            if(!boards[currentMove][k][BOARD_WIDTH-2]) return 0;
        } else {
            if(!boards[currentMove][BOARD_HEIGHT-1-k][1]) return 0;
        }
    }

    /* [HGM] <popupFix> kludge to avoid having to know the exact promotion
       move type in caller when we know the move is a legal promotion */
    if(moveType == NormalMove && promoChar)
        moveType = WhiteOnMove(currentMove) ? WhitePromotion : BlackPromotion;

    /* [HGM] <popupFix> The following if has been moved here from
       UserMoveEvent(). Because it seemed to belong here (why not allow
       piece drops in training games?), and because it can only be
       performed after it is known to what we promote. */
    if (gameMode == Training) {
      /* compare the move played on the board to the next move in the
       * game. If they match, display the move and the opponent's response.
       * If they don't match, display an error message.
       */
      int saveAnimate;
      Board testBoard;
      CopyBoard(testBoard, boards[currentMove]);
      ApplyMove(fromX, fromY, toX, toY, promoChar, testBoard);

      if (CompareBoards(testBoard, boards[currentMove+1])) {
        ForwardInner(currentMove+1);

        /* Autoplay the opponent's response.
         * if appData.animate was TRUE when Training mode was entered,
         * the response will be animated.
         */
        saveAnimate = appData.animate;
        appData.animate = animateTraining;
        ForwardInner(currentMove+1);
        appData.animate = saveAnimate;

        /* check for the end of the game */
        if (currentMove >= forwardMostMove) {
          gameMode = PlayFromGameFile;
          ModeHighlight();
          SetTrainingModeOff();
          DisplayInformation(_("End of game"));
        }
      } else {
        DisplayError(_("Incorrect move"), 0);
      }
      return 1;
    }

  /* Ok, now we know that the move is good, so we can kill
     the previous line in Analysis Mode */
  if ((gameMode == AnalyzeMode || gameMode == EditGame || gameMode == PlayFromGameFile && appData.variations && shiftKey)
                                && currentMove < forwardMostMove) {
    if(appData.variations && shiftKey) PushTail(currentMove, forwardMostMove); // [HGM] vari: save tail of game
    else forwardMostMove = currentMove;
  }

  /* If we need the chess program but it's dead, restart it */
  ResurrectChessProgram();

  /* A user move restarts a paused game*/
  if (pausing)
    PauseEvent();

  thinkOutput[0] = NULLCHAR;

  MakeMove(fromX, fromY, toX, toY, promoChar); /*updates forwardMostMove*/

  if(Adjudicate(NULL)) { // [HGM] adjudicate: take care of automatic game end
    ShowMove(fromX, fromY, toX, toY); /*updates currentMove*/
    return 1;
  }

  if (gameMode == BeginningOfGame) {
    if (appData.noChessProgram) {
      gameMode = EditGame;
      SetGameInfo();
    } else {
      char buf[MSG_SIZ];
      gameMode = MachinePlaysBlack;
      StartClocks();
      SetGameInfo();
      snprintf(buf, MSG_SIZ, "%s %s %s", gameInfo.white, _("vs."), gameInfo.black);
      DisplayTitle(buf);
      if (first.sendName) {
        snprintf(buf, MSG_SIZ,"name %s\n", gameInfo.white);
        SendToProgram(buf, &first);
      }
      StartClocks();
    }
    ModeHighlight();
  }

  /* Relay move to ICS or chess engine */
  if (appData.icsActive) {
    if (gameMode == IcsPlayingWhite || gameMode == IcsPlayingBlack ||
        gameMode == IcsExamining) {
      if(userOfferedDraw && (signed char)boards[forwardMostMove][EP_STATUS] <= EP_DRAWS) {
        SendToICS(ics_prefix); // [HGM] drawclaim: send caim and move on one line for FICS
        SendToICS("draw ");
        SendMoveToICS(moveType, fromX, fromY, toX, toY, promoChar);
      }
      // also send plain move, in case ICS does not understand atomic claims
      SendMoveToICS(moveType, fromX, fromY, toX, toY, promoChar);
      ics_user_moved = 1;
    }
  } else {
    if (first.sendTime && (gameMode == BeginningOfGame ||
                           gameMode == MachinePlaysWhite ||
                           gameMode == MachinePlaysBlack)) {
      SendTimeRemaining(&first, gameMode != MachinePlaysBlack);
    }
    if (gameMode != EditGame && gameMode != PlayFromGameFile) {
         // [HGM] book: if program might be playing, let it use book
        bookHit = SendMoveToBookUser(forwardMostMove-1, &first, FALSE);
        first.maybeThinking = TRUE;
    } else if(fromY == DROP_RANK && fromX == EmptySquare) {
        if(!first.useSetboard) SendToProgram("undo\n", &first); // kludge to change stm in engines that do not support setboard
        SendBoard(&first, currentMove+1);
    } else SendMoveToProgram(forwardMostMove-1, &first);
    if (currentMove == cmailOldMove + 1) {
      cmailMoveType[lastLoadGameNumber - 1] = CMAIL_MOVE;
    }
  }

  ShowMove(fromX, fromY, toX, toY); /*updates currentMove*/

  switch (gameMode) {
  case EditGame:
    if(appData.testLegality)
    switch (MateTest(boards[currentMove], PosFlags(currentMove)) ) {
    case MT_NONE:
    case MT_CHECK:
      break;
    case MT_CHECKMATE:
    case MT_STAINMATE:
      if (WhiteOnMove(currentMove)) {
        GameEnds(BlackWins, "Black mates", GE_PLAYER);
      } else {
        GameEnds(WhiteWins, "White mates", GE_PLAYER);
      }
      break;
    case MT_STALEMATE:
      GameEnds(GameIsDrawn, "Stalemate", GE_PLAYER);
      break;
    }
    break;

  case MachinePlaysBlack:
  case MachinePlaysWhite:
    /* disable certain menu options while machine is thinking */
    SetMachineThinkingEnables();
    break;

  default:
    break;
  }

  userOfferedDraw = FALSE; // [HGM] drawclaim: after move made, and tested for claimable draw
  promoDefaultAltered = FALSE; // [HGM] fall back on default choice

  if(bookHit) { // [HGM] book: simulate book reply
        static char bookMove[MSG_SIZ]; // a bit generous?

        programStats.nodes = programStats.depth = programStats.time =
        programStats.score = programStats.got_only_move = 0;
        sprintf(programStats.movelist, "%s (xbook)", bookHit);

        safeStrCpy(bookMove, "move ", sizeof(bookMove)/sizeof(bookMove[0]));
        strcat(bookMove, bookHit);
        HandleMachineMove(bookMove, &first);
  }
  return 1;
}

void
Mark (Board board, int flags, ChessMove kind, int rf, int ff, int rt, int ft, VOIDSTAR closure)
{
    typedef char Markers[BOARD_RANKS][BOARD_FILES];
    Markers *m = (Markers *) closure;
    if(rf == fromY && ff == fromX)
        (*m)[rt][ft] = 1 + (board[rt][ft] != EmptySquare
                         || kind == WhiteCapturesEnPassant
                         || kind == BlackCapturesEnPassant);
    else if(flags & F_MANDATORY_CAPTURE && board[rt][ft] != EmptySquare) (*m)[rt][ft] = 3;
}

void
MarkTargetSquares (int clear)
{
  int x, y;
  if(!appData.markers || !appData.highlightDragging || appData.icsActive && gameInfo.variant < VariantShogi ||
     !appData.testLegality || gameMode == EditPosition) return;
  if(clear) {
    for(x=0; x<BOARD_WIDTH; x++) for(y=0; y<BOARD_HEIGHT; y++) marker[y][x] = 0;
  } else {
    int capt = 0;
    GenLegal(boards[currentMove], PosFlags(currentMove), Mark, (void*) marker, EmptySquare);
    if(PosFlags(0) & F_MANDATORY_CAPTURE) {
      for(x=0; x<BOARD_WIDTH; x++) for(y=0; y<BOARD_HEIGHT; y++) if(marker[y][x]>1) capt++;
      if(capt)
      for(x=0; x<BOARD_WIDTH; x++) for(y=0; y<BOARD_HEIGHT; y++) if(marker[y][x] == 1) marker[y][x] = 0;
    }
  }
  DrawPosition(TRUE, NULL);
}

int
Explode (Board board, int fromX, int fromY, int toX, int toY)
{
    if(gameInfo.variant == VariantAtomic &&
       (board[toY][toX] != EmptySquare ||                     // capture?
        toX != fromX && (board[fromY][fromX] == WhitePawn ||  // e.p. ?
                         board[fromY][fromX] == BlackPawn   )
      )) {
        AnimateAtomicCapture(board, fromX, fromY, toX, toY);
        return TRUE;
    }
    return FALSE;
}

ChessSquare gatingPiece = EmptySquare; // exported to front-end, for dragging

int
CanPromote (ChessSquare piece, int y)
{
        if(gameMode == EditPosition) return FALSE; // no promotions when editing position
        // some variants have fixed promotion piece, no promotion at all, or another selection mechanism
        if(gameInfo.variant == VariantShogi    || gameInfo.variant == VariantXiangqi ||
           gameInfo.variant == VariantSuper    || gameInfo.variant == VariantGreat   ||
           gameInfo.variant == VariantShatranj || gameInfo.variant == VariantCourier ||
                                                  gameInfo.variant == VariantMakruk) return FALSE;
        return (piece == BlackPawn && y == 1 ||
                piece == WhitePawn && y == BOARD_HEIGHT-2 ||
                piece == BlackLance && y == 1 ||
                piece == WhiteLance && y == BOARD_HEIGHT-2 );
}

void
LeftClick (ClickType clickType, int xPix, int yPix)
{
    int x, y;
    Boolean saveAnimate;
    static int second = 0, promotionChoice = 0, clearFlag = 0;
    char promoChoice = NULLCHAR;
    ChessSquare piece;

    if(appData.seekGraph && appData.icsActive && loggedOn &&
        (gameMode == BeginningOfGame || gameMode == IcsIdle)) {
        SeekGraphClick(clickType, xPix, yPix, 0);
        return;
    }

    if (clickType == Press) ErrorPopDown();

    x = EventToSquare(xPix, BOARD_WIDTH);
    y = EventToSquare(yPix, BOARD_HEIGHT);
    if (!flipView && y >= 0) {
        y = BOARD_HEIGHT - 1 - y;
    }
    if (flipView && x >= 0) {
        x = BOARD_WIDTH - 1 - x;
    }

    if(promoSweep != EmptySquare) { // up-click during sweep-select of promo-piece
        defaultPromoChoice = promoSweep;
        promoSweep = EmptySquare;   // terminate sweep
        promoDefaultAltered = TRUE;
        if(!selectFlag && (x != toX || y != toY)) x = fromX, y = fromY; // and fake up-click on same square if we were still selecting
    }

    if(promotionChoice) { // we are waiting for a click to indicate promotion piece
        if(clickType == Release) return; // ignore upclick of click-click destination
        promotionChoice = FALSE; // only one chance: if click not OK it is interpreted as cancel
        if(appData.debugMode) fprintf(debugFP, "promotion click, x=%d, y=%d\n", x, y);
        if(gameInfo.holdingsWidth &&
                (WhiteOnMove(currentMove)
                        ? x == BOARD_WIDTH-1 && y < gameInfo.holdingsSize && y >= 0
                        : x == 0 && y >= BOARD_HEIGHT - gameInfo.holdingsSize && y < BOARD_HEIGHT) ) {
            // click in right holdings, for determining promotion piece
            ChessSquare p = boards[currentMove][y][x];
            if(appData.debugMode) fprintf(debugFP, "square contains %d\n", (int)p);
            if(p == WhitePawn || p == BlackPawn) p = EmptySquare; // [HGM] Pawns could be valid as deferral
            if(p != EmptySquare || gameInfo.variant == VariantGrand && toY != 0 && toY != BOARD_HEIGHT-1) { // [HGM] grand: empty square means defer
                FinishMove(NormalMove, fromX, fromY, toX, toY, p==EmptySquare ? NULLCHAR : ToLower(PieceToChar(p)));
                fromX = fromY = -1;
                return;
            }
        }
        DrawPosition(FALSE, boards[currentMove]);
        return;
    }

    /* [HGM] holdings: next 5 lines: ignore all clicks between board and holdings */
    if(clickType == Press
            && ( x == BOARD_LEFT-1 || x == BOARD_RGHT
              || x == BOARD_LEFT-2 && y < BOARD_HEIGHT-gameInfo.holdingsSize
              || x == BOARD_RGHT+1 && y >= gameInfo.holdingsSize) )
        return;

    if(clickType == Press && fromX == x && fromY == y && promoDefaultAltered)
        fromX = fromY = -1; // second click on piece after altering default promo piece treated as first click

    if(!promoDefaultAltered) { // determine default promotion piece, based on the side the user is moving for
        int side = (gameMode == IcsPlayingWhite || gameMode == MachinePlaysBlack ||
                    gameMode != MachinePlaysWhite && gameMode != IcsPlayingBlack && WhiteOnMove(currentMove));
        defaultPromoChoice = DefaultPromoChoice(side);
    }

    autoQueen = appData.alwaysPromoteToQueen;

    if (fromX == -1) {
      int originalY = y;
      gatingPiece = EmptySquare;
      if (clickType != Press) {
        if(dragging) { // [HGM] from-square must have been reset due to game end since last press
            DragPieceEnd(xPix, yPix); dragging = 0;
            DrawPosition(FALSE, NULL);
        }
        return;
      }
      fromX = x; fromY = y; toX = toY = -1;
      if(!appData.oneClick || !OnlyMove(&x, &y, FALSE) ||
         // even if only move, we treat as normal when this would trigger a promotion popup, to allow sweep selection
         appData.sweepSelect && CanPromote(boards[currentMove][fromY][fromX], fromY) && originalY != y) {
            /* First square */
            if (OKToStartUserMove(fromX, fromY)) {
                second = 0;
                MarkTargetSquares(0);
                DragPieceBegin(xPix, yPix, FALSE); dragging = 1;
                if(appData.sweepSelect && CanPromote(piece = boards[currentMove][fromY][fromX], fromY)) {
                    promoSweep = defaultPromoChoice;
                    selectFlag = 0; lastX = xPix; lastY = yPix;
                    Sweep(0); // Pawn that is going to promote: preview promotion piece
                    DisplayMessage("", _("Pull pawn backwards to under-promote"));
                }
                if (appData.highlightDragging) {
                    SetHighlights(fromX, fromY, -1, -1);
                }
            } else fromX = fromY = -1;
            return;
        }
    }

    /* fromX != -1 */
    if (clickType == Press && gameMode != EditPosition) {
        ChessSquare fromP;
        ChessSquare toP;
        int frc;

        // ignore off-board to clicks
        if(y < 0 || x < 0) return;

        /* Check if clicking again on the same color piece */
        fromP = boards[currentMove][fromY][fromX];
        toP = boards[currentMove][y][x];
        frc = gameInfo.variant == VariantFischeRandom || gameInfo.variant == VariantCapaRandom || gameInfo.variant == VariantSChess;
        if ((WhitePawn <= fromP && fromP <= WhiteKing &&
             WhitePawn <= toP && toP <= WhiteKing &&
             !(fromP == WhiteKing && toP == WhiteRook && frc) &&
             !(fromP == WhiteRook && toP == WhiteKing && frc)) ||
            (BlackPawn <= fromP && fromP <= BlackKing &&
             BlackPawn <= toP && toP <= BlackKing &&
             !(fromP == BlackRook && toP == BlackKing && frc) && // allow also RxK as FRC castling
             !(fromP == BlackKing && toP == BlackRook && frc))) {
            /* Clicked again on same color piece -- changed his mind */
            second = (x == fromX && y == fromY);
            promoDefaultAltered = FALSE;
            MarkTargetSquares(1);
           if(!second || appData.oneClick && !OnlyMove(&x, &y, TRUE)) {
            if (appData.highlightDragging) {
                SetHighlights(x, y, -1, -1);
            } else {
                ClearHighlights();
            }
            if (OKToStartUserMove(x, y)) {
                if(gameInfo.variant == VariantSChess && // S-Chess: back-rank piece selected after holdings means gating
                  (fromX == BOARD_LEFT-2 || fromX == BOARD_RGHT+1) &&
               y == (toP < BlackPawn ? 0 : BOARD_HEIGHT-1))
                 gatingPiece = boards[currentMove][fromY][fromX];
                else gatingPiece = EmptySquare;
                fromX = x;
                fromY = y; dragging = 1;
                MarkTargetSquares(0);
                DragPieceBegin(xPix, yPix, FALSE);
                if(appData.sweepSelect && CanPromote(piece = boards[currentMove][y][x], y)) {
                    promoSweep = defaultPromoChoice;
                    selectFlag = 0; lastX = xPix; lastY = yPix;
                    Sweep(0); // Pawn that is going to promote: preview promotion piece
                }
            }
           }
           if(x == fromX && y == fromY) return; // if OnlyMove altered (x,y) we go on
           second = FALSE; 
        }
        // ignore clicks on holdings
        if(x < BOARD_LEFT || x >= BOARD_RGHT) return;
    }

    if (clickType == Release && x == fromX && y == fromY) {
        DragPieceEnd(xPix, yPix); dragging = 0;
        if(clearFlag) {
            // a deferred attempt to click-click move an empty square on top of a piece
            boards[currentMove][y][x] = EmptySquare;
            ClearHighlights();
            DrawPosition(FALSE, boards[currentMove]);
            fromX = fromY = -1; clearFlag = 0;
            return;
        }
        if (appData.animateDragging) {
            /* Undo animation damage if any */
            DrawPosition(FALSE, NULL);
        }
        if (second) {
            /* Second up/down in same square; just abort move */
            second = 0;
            fromX = fromY = -1;
            gatingPiece = EmptySquare;
            ClearHighlights();
            gotPremove = 0;
            ClearPremoveHighlights();
        } else {
            /* First upclick in same square; start click-click mode */
            SetHighlights(x, y, -1, -1);
        }
        return;
    }

    clearFlag = 0;

    /* we now have a different from- and (possibly off-board) to-square */
    /* Completed move */
    toX = x;
    toY = y;
    saveAnimate = appData.animate;
    MarkTargetSquares(1);
    if (clickType == Press) {
        if(gameMode == EditPosition && boards[currentMove][fromY][fromX] == EmptySquare) {
            // must be Edit Position mode with empty-square selected
            fromX = x; fromY = y; DragPieceBegin(xPix, yPix, FALSE); dragging = 1; // consider this a new attempt to drag
            if(x >= BOARD_LEFT && x < BOARD_RGHT) clearFlag = 1; // and defer click-click move of empty-square to up-click
            return;
        }
        if(appData.sweepSelect && HasPromotionChoice(fromX, fromY, toX, toY, &promoChoice, FALSE)) {
            ChessSquare piece = boards[currentMove][fromY][fromX];
            DragPieceBegin(xPix, yPix, TRUE); dragging = 1;
            promoSweep = defaultPromoChoice;
            if(PieceToChar(PROMOTED piece) == '+') promoSweep = PROMOTED piece;
            selectFlag = 0; lastX = xPix; lastY = yPix;
            Sweep(0); // Pawn that is going to promote: preview promotion piece
            DisplayMessage("", _("Pull pawn backwards to under-promote"));
            DrawPosition(FALSE, boards[currentMove]);
            return;
        }
        /* Finish clickclick move */
        if (appData.animate || appData.highlightLastMove) {
            SetHighlights(fromX, fromY, toX, toY);
        } else {
            ClearHighlights();
        }
    } else {
        /* Finish drag move */
        if (appData.highlightLastMove) {
            SetHighlights(fromX, fromY, toX, toY);
        } else {
            ClearHighlights();
        }
        DragPieceEnd(xPix, yPix); dragging = 0;
        /* Don't animate move and drag both */
        appData.animate = FALSE;
    }

    // moves into holding are invalid for now (except in EditPosition, adapting to-square)
    if(x >= 0 && x < BOARD_LEFT || x >= BOARD_RGHT) {
        ChessSquare piece = boards[currentMove][fromY][fromX];
        if(gameMode == EditPosition && piece != EmptySquare &&
           fromX >= BOARD_LEFT && fromX < BOARD_RGHT) {
            int n;

            if(x == BOARD_LEFT-2 && piece >= BlackPawn) {
                n = PieceToNumber(piece - (int)BlackPawn);
                if(n >= gameInfo.holdingsSize) { n = 0; piece = BlackPawn; }
                boards[currentMove][BOARD_HEIGHT-1 - n][0] = piece;
                boards[currentMove][BOARD_HEIGHT-1 - n][1]++;
            } else
            if(x == BOARD_RGHT+1 && piece < BlackPawn) {
                n = PieceToNumber(piece);
                if(n >= gameInfo.holdingsSize) { n = 0; piece = WhitePawn; }
                boards[currentMove][n][BOARD_WIDTH-1] = piece;
                boards[currentMove][n][BOARD_WIDTH-2]++;
            }
            boards[currentMove][fromY][fromX] = EmptySquare;
        }
        ClearHighlights();
        fromX = fromY = -1;
        DrawPosition(TRUE, boards[currentMove]);
        return;
    }

    // off-board moves should not be highlighted
    if(x < 0 || y < 0) ClearHighlights();

    if(gatingPiece != EmptySquare) promoChoice = ToLower(PieceToChar(gatingPiece));

    if (HasPromotionChoice(fromX, fromY, toX, toY, &promoChoice, appData.sweepSelect)) {
        SetHighlights(fromX, fromY, toX, toY);
        if(gameInfo.variant == VariantSuper || gameInfo.variant == VariantGreat || gameInfo.variant == VariantGrand) {
            // [HGM] super: promotion to captured piece selected from holdings
            ChessSquare p = boards[currentMove][fromY][fromX], q = boards[currentMove][toY][toX];
            promotionChoice = TRUE;
            // kludge follows to temporarily execute move on display, without promoting yet
            boards[currentMove][fromY][fromX] = EmptySquare; // move Pawn to 8th rank
            boards[currentMove][toY][toX] = p;
            DrawPosition(FALSE, boards[currentMove]);
            boards[currentMove][fromY][fromX] = p; // take back, but display stays
            boards[currentMove][toY][toX] = q;
            DisplayMessage("Click in holdings to choose piece", "");
            return;
        }
        PromotionPopUp();
    } else {
        int oldMove = currentMove;
        UserMoveEvent(fromX, fromY, toX, toY, promoChoice);
        if (!appData.highlightLastMove || gotPremove) ClearHighlights();
        if (gotPremove) SetPremoveHighlights(fromX, fromY, toX, toY);
        if(saveAnimate && !appData.animate && currentMove != oldMove && // drag-move was performed
           Explode(boards[currentMove-1], fromX, fromY, toX, toY))
            DrawPosition(TRUE, boards[currentMove]);
        fromX = fromY = -1;
    }
    appData.animate = saveAnimate;
    if (appData.animate || appData.animateDragging) {
        /* Undo animation damage if needed */
        DrawPosition(FALSE, NULL);
    }
}

int
RightClick (ClickType action, int x, int y, int *fromX, int *fromY)
{   // front-end-free part taken out of PieceMenuPopup
    int whichMenu; int xSqr, ySqr;

    if(seekGraphUp) { // [HGM] seekgraph
        if(action == Press)   SeekGraphClick(Press, x, y, 2); // 2 indicates right-click: no pop-down on miss
        if(action == Release) SeekGraphClick(Release, x, y, 2); // and no challenge on hit
        return -2;
    }

    if((gameMode == IcsPlayingWhite || gameMode == IcsPlayingBlack)
         && !appData.zippyPlay && appData.bgObserve) { // [HGM] bughouse: show background game
        if(!partnerBoardValid) return -2; // suppress display of uninitialized boards
        if( appData.dualBoard) return -2; // [HGM] dual: is already displayed
        if(action == Press)   {
            originalFlip = flipView;
            flipView = !flipView; // temporarily flip board to see game from partners perspective
            DrawPosition(TRUE, partnerBoard);
            DisplayMessage(partnerStatus, "");
            partnerUp = TRUE;
        } else if(action == Release) {
            flipView = originalFlip;
            DrawPosition(TRUE, boards[currentMove]);
            partnerUp = FALSE;
        }
        return -2;
    }

    xSqr = EventToSquare(x, BOARD_WIDTH);
    ySqr = EventToSquare(y, BOARD_HEIGHT);
    if (action == Release) {
        if(pieceSweep != EmptySquare) {
            EditPositionMenuEvent(pieceSweep, toX, toY);
            pieceSweep = EmptySquare;
        } else UnLoadPV(); // [HGM] pv
    }
    if (action != Press) return -2; // return code to be ignored
    switch (gameMode) {
      case IcsExamining:
        if(xSqr < BOARD_LEFT || xSqr >= BOARD_RGHT) return -1;
      case EditPosition:
        if (xSqr == BOARD_LEFT-1 || xSqr == BOARD_RGHT) return -1;
        if (xSqr < 0 || ySqr < 0) return -1;
        if(appData.pieceMenu) { whichMenu = 0; break; } // edit-position menu
        pieceSweep = shiftKey ? BlackPawn : WhitePawn;  // [HGM] sweep: prepare selecting piece by mouse sweep
        toX = xSqr; toY = ySqr; lastX = x, lastY = y;
        if(flipView) toX = BOARD_WIDTH - 1 - toX; else toY = BOARD_HEIGHT - 1 - toY;
        NextPiece(0);
        return 2; // grab
      case IcsObserving:
        if(!appData.icsEngineAnalyze) return -1;
      case IcsPlayingWhite:
      case IcsPlayingBlack:
        if(!appData.zippyPlay) goto noZip;
      case AnalyzeMode:
      case AnalyzeFile:
      case MachinePlaysWhite:
      case MachinePlaysBlack:
      case TwoMachinesPlay: // [HGM] pv: use for showing PV
        if (!appData.dropMenu) {
          LoadPV(x, y);
          return 2; // flag front-end to grab mouse events
        }
        if(gameMode == TwoMachinesPlay || gameMode == AnalyzeMode ||
           gameMode == AnalyzeFile || gameMode == IcsObserving) return -1;
      case EditGame:
      noZip:
        if (xSqr < 0 || ySqr < 0) return -1;
        if (!appData.dropMenu || appData.testLegality &&
            gameInfo.variant != VariantBughouse &&
            gameInfo.variant != VariantCrazyhouse) return -1;
        whichMenu = 1; // drop menu
        break;
      default:
        return -1;
    }

    if (((*fromX = xSqr) < 0) ||
        ((*fromY = ySqr) < 0)) {
        *fromX = *fromY = -1;
        return -1;
    }
    if (flipView)
      *fromX = BOARD_WIDTH - 1 - *fromX;
    else
      *fromY = BOARD_HEIGHT - 1 - *fromY;

    return whichMenu;
}

void
SendProgramStatsToFrontend (ChessProgramState * cps, ChessProgramStats * cpstats)
{
//    char * hint = lastHint;
    FrontEndProgramStats stats;

    stats.which = cps == &first ? 0 : 1;
    stats.depth = cpstats->depth;
    stats.nodes = cpstats->nodes;
    stats.score = cpstats->score;
    stats.time = cpstats->time;
    stats.pv = cpstats->movelist;
    stats.hint = lastHint;
    stats.an_move_index = 0;
    stats.an_move_count = 0;

    if( gameMode == AnalyzeMode || gameMode == AnalyzeFile ) {
        stats.hint = cpstats->move_name;
        stats.an_move_index = cpstats->nr_moves - cpstats->moves_left;
        stats.an_move_count = cpstats->nr_moves;
    }

    if(stats.pv && stats.pv[0]) safeStrCpy(lastPV[stats.which], stats.pv, sizeof(lastPV[stats.which])/sizeof(lastPV[stats.which][0])); // [HGM] pv: remember last PV of each

    SetProgramStats( &stats );
}

void
ClearEngineOutputPane (int which)
{
    static FrontEndProgramStats dummyStats;
    dummyStats.which = which;
    dummyStats.pv = "#";
    SetProgramStats( &dummyStats );
}

#define MAXPLAYERS 500

char *
TourneyStandings (int display)
{
    int i, w, b, color, wScore, bScore, dummy, nr=0, nPlayers=0;
    int score[MAXPLAYERS], ranking[MAXPLAYERS], points[MAXPLAYERS], games[MAXPLAYERS];
    char result, *p, *names[MAXPLAYERS];

    if(appData.tourneyType < 0 && !strchr(appData.results, '*'))
        return strdup(_("Swiss tourney finished")); // standings of Swiss yet TODO
    names[0] = p = strdup(appData.participants);
    while(p = strchr(p, '\n')) *p++ = NULLCHAR, names[++nPlayers] = p; // count participants

    for(i=0; i<nPlayers; i++) score[i] = games[i] = 0;

    while(result = appData.results[nr]) {
        color = Pairing(nr, nPlayers, &w, &b, &dummy);
        if(!(color ^ matchGame & 1)) { dummy = w; w = b; b = dummy; }
        wScore = bScore = 0;
        switch(result) {
          case '+': wScore = 2; break;
          case '-': bScore = 2; break;
          case '=': wScore = bScore = 1; break;
          case ' ':
          case '*': return strdup("busy"); // tourney not finished
        }
        score[w] += wScore;
        score[b] += bScore;
        games[w]++;
        games[b]++;
        nr++;
    }
    if(appData.tourneyType > 0) nPlayers = appData.tourneyType; // in gauntlet, list only gauntlet engine(s)
    for(w=0; w<nPlayers; w++) {
        bScore = -1;
        for(i=0; i<nPlayers; i++) if(score[i] > bScore) bScore = score[i], b = i;
        ranking[w] = b; points[w] = bScore; score[b] = -2;
    }
    p = malloc(nPlayers*34+1);
    for(w=0; w<nPlayers && w<display; w++)
        sprintf(p+34*w, "%2d. %5.1f/%-3d %-19.19s\n", w+1, points[w]/2., games[ranking[w]], names[ranking[w]]);
    free(names[0]);
    return p;
}

void
Count (Board board, int pCnt[], int *nW, int *nB, int *wStale, int *bStale, int *bishopColor)
{       // count all piece types
        int p, f, r;
        *nB = *nW = *wStale = *bStale = *bishopColor = 0;
        for(p=WhitePawn; p<=EmptySquare; p++) pCnt[p] = 0;
        for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) {
                p = board[r][f];
                pCnt[p]++;
                if(p == WhitePawn && r == BOARD_HEIGHT-1) (*wStale)++; else
                if(p == BlackPawn && r == 0) (*bStale)++; // count last-Rank Pawns (XQ) separately
                if(p <= WhiteKing) (*nW)++; else if(p <= BlackKing) (*nB)++;
                if(p == WhiteBishop || p == WhiteFerz || p == WhiteAlfil ||
                   p == BlackBishop || p == BlackFerz || p == BlackAlfil   )
                        *bishopColor |= 1 << ((f^r)&1); // track square color of color-bound pieces
        }
}

int
SufficientDefence (int pCnt[], int side, int nMine, int nHis)
{
        int myPawns = pCnt[WhitePawn+side]; // my total Pawn count;
        int majorDefense = pCnt[BlackRook-side] + pCnt[BlackCannon-side] + pCnt[BlackKnight-side];

        nMine -= pCnt[WhiteFerz+side] + pCnt[WhiteAlfil+side]; // discount defenders
        if(nMine - myPawns > 2) return FALSE; // no trivial draws with more than 1 major
        if(myPawns == 2 && nMine == 3) // KPP
            return majorDefense || pCnt[BlackFerz-side] + pCnt[BlackAlfil-side] >= 3;
        if(myPawns == 1 && nMine == 2) // KP
            return majorDefense || pCnt[BlackFerz-side] + pCnt[BlackAlfil-side]  + pCnt[BlackPawn-side] >= 1;
        if(myPawns == 1 && nMine == 3 && pCnt[WhiteKnight+side]) // KHP
            return majorDefense || pCnt[BlackFerz-side] + pCnt[BlackAlfil-side]*2 >= 5;
        if(myPawns) return FALSE;
        if(pCnt[WhiteRook+side])
            return pCnt[BlackRook-side] ||
                   pCnt[BlackCannon-side] && (pCnt[BlackFerz-side] >= 2 || pCnt[BlackAlfil-side] >= 2) ||
                   pCnt[BlackKnight-side] && pCnt[BlackFerz-side] + pCnt[BlackAlfil-side] > 2 ||
                   pCnt[BlackFerz-side] + pCnt[BlackAlfil-side] >= 4;
        if(pCnt[WhiteCannon+side]) {
            if(pCnt[WhiteFerz+side] + myPawns == 0) return TRUE; // Cannon needs platform
            return majorDefense || pCnt[BlackAlfil-side] >= 2;
        }
        if(pCnt[WhiteKnight+side])
            return majorDefense || pCnt[BlackFerz-side] >= 2 || pCnt[BlackAlfil-side] + pCnt[BlackPawn-side] >= 1;
        return FALSE;
}

int
MatingPotential (int pCnt[], int side, int nMine, int nHis, int stale, int bisColor)
{
        VariantClass v = gameInfo.variant;

        if(v == VariantShogi || v == VariantCrazyhouse || v == VariantBughouse) return TRUE; // drop games always winnable
        if(v == VariantShatranj) return TRUE; // always winnable through baring
        if(v == VariantLosers || v == VariantSuicide || v == VariantGiveaway) return TRUE;
        if(v == Variant3Check || v == VariantAtomic) return nMine > 1; // can win through checking / exploding King

        if(v == VariantXiangqi) {
                int majors = 5*pCnt[BlackKnight-side] + 7*pCnt[BlackCannon-side] + 7*pCnt[BlackRook-side];

                nMine -= pCnt[WhiteFerz+side] + pCnt[WhiteAlfil+side] + stale; // discount defensive pieces and back-rank Pawns
                if(nMine + stale == 1) return (pCnt[BlackFerz-side] > 1 && pCnt[BlackKnight-side] > 0); // bare K can stalemate KHAA (!)
                if(nMine > 2) return TRUE; // if we don't have P, H or R, we must have CC
                if(nMine == 2 && pCnt[WhiteCannon+side] == 0) return TRUE; // We have at least one P, H or R
                // if we get here, we must have KC... or KP..., possibly with additional A, E or last-rank P
                if(stale) // we have at least one last-rank P plus perhaps C
                    return majors // KPKX
                        || pCnt[BlackFerz-side] && pCnt[BlackFerz-side] + pCnt[WhiteCannon+side] + stale > 2; // KPKAA, KPPKA and KCPKA
                else // KCA*E*
                    return pCnt[WhiteFerz+side] // KCAK
                        || pCnt[WhiteAlfil+side] && pCnt[BlackRook-side] + pCnt[BlackCannon-side] + pCnt[BlackFerz-side] // KCEKA, KCEKX (X!=H)
                        || majors + (12*pCnt[BlackFerz-side] | 6*pCnt[BlackAlfil-side]) > 16; // KCKAA, KCKAX, KCKEEX, KCKEXX (XX!=HH), KCKXXX
                // TO DO: cases wih an unpromoted f-Pawn acting as platform for an opponent Cannon

        } else if(pCnt[WhiteKing] == 1 && pCnt[BlackKing] == 1) { // other variants with orthodox Kings
                int nBishops = pCnt[WhiteBishop+side] + pCnt[WhiteFerz+side];

                if(nMine == 1) return FALSE; // bare King
                if(nBishops && bisColor == 3) return TRUE; // There must be a second B/A/F, which can either block (his) or attack (mine) the escape square
                nMine += (nBishops > 0) - nBishops; // By now all Bishops (and Ferz) on like-colored squares, so count as one
                if(nMine > 2 && nMine != pCnt[WhiteAlfil+side] + 1) return TRUE; // At least two pieces, not all Alfils
                // by now we have King + 1 piece (or multiple Bishops on the same color)
                if(pCnt[WhiteKnight+side])
                        return (pCnt[BlackKnight-side] + pCnt[BlackBishop-side] + pCnt[BlackMan-side] +
                                pCnt[BlackWazir-side] + pCnt[BlackSilver-side] + bisColor // KNKN, KNKB, KNKF, KNKE, KNKW, KNKM, KNKS
                             || nHis > 3); // be sure to cover suffocation mates in corner (e.g. KNKQCA)
                if(nBishops)
                        return (pCnt[BlackKnight-side]); // KBKN, KFKN
                if(pCnt[WhiteAlfil+side])
                        return (nHis > 2); // Alfils can in general not reach a corner square, but there might be edge (suffocation) mates
                if(pCnt[WhiteWazir+side])
                        return (pCnt[BlackKnight-side] + pCnt[BlackWazir-side] + pCnt[BlackAlfil-side]); // KWKN, KWKW, KWKE
        }

        return TRUE;
}

int
CompareWithRights (Board b1, Board b2)
{
    int rights = 0;
    if(!CompareBoards(b1, b2)) return FALSE;
    if(b1[EP_STATUS] != b2[EP_STATUS]) return FALSE;
    /* compare castling rights */
    if( b1[CASTLING][2] != b2[CASTLING][2] && (b2[CASTLING][0] != NoRights || b2[CASTLING][1] != NoRights) )
           rights++; /* King lost rights, while rook still had them */
    if( b1[CASTLING][2] != NoRights ) { /* king has rights */
        if( b1[CASTLING][0] != b2[CASTLING][0] || b1[CASTLING][1] != b2[CASTLING][1] )
           rights++; /* but at least one rook lost them */
    }
    if( b1[CASTLING][5] != b1[CASTLING][5] && (b2[CASTLING][3] != NoRights || b2[CASTLING][4] != NoRights) )
           rights++;
    if( b1[CASTLING][5] != NoRights ) {
        if( b1[CASTLING][3] != b2[CASTLING][3] || b1[CASTLING][4] != b2[CASTLING][4] )
           rights++;
    }
    return rights == 0;
}

int
Adjudicate (ChessProgramState *cps)
{       // [HGM] some adjudications useful with buggy engines
        // [HGM] adjudicate: made into separate routine, which now can be called after every move
        //       In any case it determnes if the game is a claimable draw (filling in EP_STATUS).
        //       Actually ending the game is now based on the additional internal condition canAdjudicate.
        //       Only when the game is ended, and the opponent is a computer, this opponent gets the move relayed.
        int k, count = 0; static int bare = 1;
        ChessProgramState *engineOpponent = (gameMode == TwoMachinesPlay ? cps->other : (cps ? NULL : &first));
        Boolean canAdjudicate = !appData.icsActive;

        // most tests only when we understand the game, i.e. legality-checking on
            if( appData.testLegality )
            {   /* [HGM] Some more adjudications for obstinate engines */
                int nrW, nrB, bishopColor, staleW, staleB, nr[EmptySquare+1], i;
                static int moveCount = 6;
                ChessMove result;
                char *reason = NULL;

                /* Count what is on board. */
                Count(boards[forwardMostMove], nr, &nrW, &nrB, &staleW, &staleB, &bishopColor);

                /* Some material-based adjudications that have to be made before stalemate test */
                if(gameInfo.variant == VariantAtomic && nr[WhiteKing] + nr[BlackKing] < 2) {
                    // [HGM] atomic: stm must have lost his King on previous move, as destroying own K is illegal
                     boards[forwardMostMove][EP_STATUS] = EP_CHECKMATE; // make claimable as if stm is checkmated
                     if(canAdjudicate && appData.checkMates) {
                         if(engineOpponent)
                           SendMoveToProgram(forwardMostMove-1, engineOpponent); // make sure opponent gets move
                         GameEnds( WhiteOnMove(forwardMostMove) ? BlackWins : WhiteWins,
                                                        "Xboard adjudication: King destroyed", GE_XBOARD );
                         return 1;
                     }
                }

                /* Bare King in Shatranj (loses) or Losers (wins) */
                if( nrW == 1 || nrB == 1) {
                  if( gameInfo.variant == VariantLosers) { // [HGM] losers: bare King wins (stm must have it first)
                     boards[forwardMostMove][EP_STATUS] = EP_WINS;  // mark as win, so it becomes claimable
                     if(canAdjudicate && appData.checkMates) {
                         if(engineOpponent)
                           SendMoveToProgram(forwardMostMove-1, engineOpponent); // make sure opponent gets to see move
                         GameEnds( WhiteOnMove(forwardMostMove) ? WhiteWins : BlackWins,
                                                        "Xboard adjudication: Bare king", GE_XBOARD );
                         return 1;
                     }
                  } else
                  if( gameInfo.variant == VariantShatranj && --bare < 0)
                  {    /* bare King */
                        boards[forwardMostMove][EP_STATUS] = EP_WINS; // make claimable as win for stm
                        if(canAdjudicate && appData.checkMates) {
                            /* but only adjudicate if adjudication enabled */
                            if(engineOpponent)
                              SendMoveToProgram(forwardMostMove-1, engineOpponent); // make sure opponent gets move
                            GameEnds( nrW > 1 ? WhiteWins : nrB > 1 ? BlackWins : GameIsDrawn,
                                                        "Xboard adjudication: Bare king", GE_XBOARD );
                            return 1;
                        }
                  }
                } else bare = 1;


            // don't wait for engine to announce game end if we can judge ourselves
            switch (MateTest(boards[forwardMostMove], PosFlags(forwardMostMove)) ) {
              case MT_CHECK:
                if(gameInfo.variant == Variant3Check) { // [HGM] 3check: when in check, test if 3rd time
                    int i, checkCnt = 0;    // (should really be done by making nr of checks part of game state)
                    for(i=forwardMostMove-2; i>=backwardMostMove; i-=2) {
                        if(MateTest(boards[i], PosFlags(i)) == MT_CHECK)
                            checkCnt++;
                        if(checkCnt >= 2) {
                            reason = "Xboard adjudication: 3rd check";
                            boards[forwardMostMove][EP_STATUS] = EP_CHECKMATE;
                            break;
                        }
                    }
                }
              case MT_NONE:
              default:
                break;
              case MT_STALEMATE:
              case MT_STAINMATE:
                reason = "Xboard adjudication: Stalemate";
                if((signed char)boards[forwardMostMove][EP_STATUS] != EP_CHECKMATE) { // [HGM] don't touch win through baring or K-capt
                    boards[forwardMostMove][EP_STATUS] = EP_STALEMATE;   // default result for stalemate is draw
                    if(gameInfo.variant == VariantLosers  || gameInfo.variant == VariantGiveaway) // [HGM] losers:
                        boards[forwardMostMove][EP_STATUS] = EP_WINS;    // in these variants stalemated is always a win
                    else if(gameInfo.variant == VariantSuicide) // in suicide it depends
                        boards[forwardMostMove][EP_STATUS] = nrW == nrB ? EP_STALEMATE :
                                                   ((nrW < nrB) != WhiteOnMove(forwardMostMove) ?
                                                                        EP_CHECKMATE : EP_WINS);
                    else if(gameInfo.variant == VariantShatranj || gameInfo.variant == VariantXiangqi)
                        boards[forwardMostMove][EP_STATUS] = EP_CHECKMATE; // and in these variants being stalemated loses
                }
                break;
              case MT_CHECKMATE:
                reason = "Xboard adjudication: Checkmate";
                boards[forwardMostMove][EP_STATUS] = (gameInfo.variant == VariantLosers ? EP_WINS : EP_CHECKMATE);
                break;
            }

                switch(i = (signed char)boards[forwardMostMove][EP_STATUS]) {
                    case EP_STALEMATE:
                        result = GameIsDrawn; break;
                    case EP_CHECKMATE:
                        result = WhiteOnMove(forwardMostMove) ? BlackWins : WhiteWins; break;
                    case EP_WINS:
                        result = WhiteOnMove(forwardMostMove) ? WhiteWins : BlackWins; break;
                    default:
                        result = EndOfFile;
                }
                if(canAdjudicate && appData.checkMates && result) { // [HGM] mates: adjudicate finished games if requested
                    if(engineOpponent)
                      SendMoveToProgram(forwardMostMove-1, engineOpponent); /* make sure opponent gets to see move */
                    GameEnds( result, reason, GE_XBOARD );
                    return 1;
                }

                /* Next absolutely insufficient mating material. */
                if(!MatingPotential(nr, WhitePawn, nrW, nrB, staleW, bishopColor) &&
                   !MatingPotential(nr, BlackPawn, nrB, nrW, staleB, bishopColor))
                {    /* includes KBK, KNK, KK of KBKB with like Bishops */

                     /* always flag draws, for judging claims */
                     boards[forwardMostMove][EP_STATUS] = EP_INSUF_DRAW;

                     if(canAdjudicate && appData.materialDraws) {
                         /* but only adjudicate them if adjudication enabled */
                         if(engineOpponent) {
                           SendToProgram("force\n", engineOpponent); // suppress reply
                           SendMoveToProgram(forwardMostMove-1, engineOpponent); /* make sure opponent gets to see last move */
                         }
                         GameEnds( GameIsDrawn, "Xboard adjudication: Insufficient mating material", GE_XBOARD );
                         return 1;
                     }
                }

                /* Then some trivial draws (only adjudicate, cannot be claimed) */
                if(gameInfo.variant == VariantXiangqi ?
                       SufficientDefence(nr, WhitePawn, nrW, nrB) && SufficientDefence(nr, BlackPawn, nrB, nrW)
                 : nrW + nrB == 4 &&
                   (   nr[WhiteRook] == 1 && nr[BlackRook] == 1 /* KRKR */
                   || nr[WhiteQueen] && nr[BlackQueen]==1     /* KQKQ */
                   || nr[WhiteKnight]==2 || nr[BlackKnight]==2     /* KNNK */
                   || nr[WhiteKnight]+nr[WhiteBishop] == 1 && nr[BlackKnight]+nr[BlackBishop] == 1 /* KBKN, KBKB, KNKN */
                   ) ) {
                     if(--moveCount < 0 && appData.trivialDraws && canAdjudicate)
                     {    /* if the first 3 moves do not show a tactical win, declare draw */
                          if(engineOpponent) {
                            SendToProgram("force\n", engineOpponent); // suppress reply
                            SendMoveToProgram(forwardMostMove-1, engineOpponent); /* make sure opponent gets to see move */
                          }
                          GameEnds( GameIsDrawn, "Xboard adjudication: Trivial draw", GE_XBOARD );
                          return 1;
                     }
                } else moveCount = 6;
            }

        // Repetition draws and 50-move rule can be applied independently of legality testing

                /* Check for rep-draws */
                count = 0;
                for(k = forwardMostMove-2;
                    k>=backwardMostMove && k>=forwardMostMove-100 &&
                        (signed char)boards[k][EP_STATUS] < EP_UNKNOWN &&
                        (signed char)boards[k+2][EP_STATUS] <= EP_NONE && (signed char)boards[k+1][EP_STATUS] <= EP_NONE;
                    k-=2)
                {   int rights=0;
                    if(CompareBoards(boards[k], boards[forwardMostMove])) {
                        /* compare castling rights */
                        if( boards[forwardMostMove][CASTLING][2] != boards[k][CASTLING][2] &&
                             (boards[k][CASTLING][0] != NoRights || boards[k][CASTLING][1] != NoRights) )
                                rights++; /* King lost rights, while rook still had them */
                        if( boards[forwardMostMove][CASTLING][2] != NoRights ) { /* king has rights */
                            if( boards[forwardMostMove][CASTLING][0] != boards[k][CASTLING][0] ||
                                boards[forwardMostMove][CASTLING][1] != boards[k][CASTLING][1] )
                                   rights++; /* but at least one rook lost them */
                        }
                        if( boards[forwardMostMove][CASTLING][5] != boards[k][CASTLING][5] &&
                             (boards[k][CASTLING][3] != NoRights || boards[k][CASTLING][4] != NoRights) )
                                rights++;
                        if( boards[forwardMostMove][CASTLING][5] != NoRights ) {
                            if( boards[forwardMostMove][CASTLING][3] != boards[k][CASTLING][3] ||
                                boards[forwardMostMove][CASTLING][4] != boards[k][CASTLING][4] )
                                   rights++;
                        }
                        if( rights == 0 && ++count > appData.drawRepeats-2 && canAdjudicate
                            && appData.drawRepeats > 1) {
                             /* adjudicate after user-specified nr of repeats */
                             int result = GameIsDrawn;
                             char *details = "XBoard adjudication: repetition draw";
                             if(gameInfo.variant == VariantXiangqi && appData.testLegality) {
                                // [HGM] xiangqi: check for forbidden perpetuals
                                int m, ourPerpetual = 1, hisPerpetual = 1;
                                for(m=forwardMostMove; m>k; m-=2) {
                                    if(MateTest(boards[m], PosFlags(m)) != MT_CHECK)
                                        ourPerpetual = 0; // the current mover did not always check
                                    if(MateTest(boards[m-1], PosFlags(m-1)) != MT_CHECK)
                                        hisPerpetual = 0; // the opponent did not always check
                                }
                                if(appData.debugMode) fprintf(debugFP, "XQ perpetual test, our=%d, his=%d\n",
                                                                        ourPerpetual, hisPerpetual);
                                if(ourPerpetual && !hisPerpetual) { // we are actively checking him: forfeit
                                    result = WhiteOnMove(forwardMostMove) ? WhiteWins : BlackWins;
                                    details = "Xboard adjudication: perpetual checking";
                                } else
                                if(hisPerpetual && !ourPerpetual) { // he is checking us, but did not repeat yet
                                    break; // (or we would have caught him before). Abort repetition-checking loop.
                                } else
                                // Now check for perpetual chases
                                if(!ourPerpetual && !hisPerpetual) { // no perpetual check, test for chase
                                    hisPerpetual = PerpetualChase(k, forwardMostMove);
                                    ourPerpetual = PerpetualChase(k+1, forwardMostMove);
                                    if(ourPerpetual && !hisPerpetual) { // we are actively chasing him: forfeit
                                        static char resdet[MSG_SIZ];
                                        result = WhiteOnMove(forwardMostMove) ? WhiteWins : BlackWins;
                                        details = resdet;
                                        snprintf(resdet, MSG_SIZ, "Xboard adjudication: perpetual chasing of %c%c", ourPerpetual>>8, ourPerpetual&255);
                                    } else
                                    if(hisPerpetual && !ourPerpetual)   // he is chasing us, but did not repeat yet
                                        break; // Abort repetition-checking loop.
                                }
                                // if neither of us is checking or chasing all the time, or both are, it is draw
                             }
                             if(engineOpponent) {
                               SendToProgram("force\n", engineOpponent); // suppress reply
                               SendMoveToProgram(forwardMostMove-1, engineOpponent); /* make sure opponent gets to see move */
                             }
                             GameEnds( result, details, GE_XBOARD );
                             return 1;
                        }
                        if( rights == 0 && count > 1 ) /* occurred 2 or more times before */
                             boards[forwardMostMove][EP_STATUS] = EP_REP_DRAW;
                    }
                }

                /* Now we test for 50-move draws. Determine ply count */
                count = forwardMostMove;
                /* look for last irreversble move */
                while( (signed char)boards[count][EP_STATUS] <= EP_NONE && count > backwardMostMove )
                    count--;
                /* if we hit starting position, add initial plies */
                if( count == backwardMostMove )
                    count -= initialRulePlies;
                count = forwardMostMove - count;
                if(gameInfo.variant == VariantXiangqi && ( count >= 100 || count >= 2*appData.ruleMoves ) ) {
                        // adjust reversible move counter for checks in Xiangqi
                        int i = forwardMostMove - count, inCheck = 0, lastCheck;
                        if(i < backwardMostMove) i = backwardMostMove;
                        while(i <= forwardMostMove) {
                                lastCheck = inCheck; // check evasion does not count
                                inCheck = (MateTest(boards[i], PosFlags(i)) == MT_CHECK);
                                if(inCheck || lastCheck) count--; // check does not count
                                i++;
                        }
                }
                if( count >= 100)
                         boards[forwardMostMove][EP_STATUS] = EP_RULE_DRAW;
                         /* this is used to judge if draw claims are legal */
                if(canAdjudicate && appData.ruleMoves > 0 && count >= 2*appData.ruleMoves) {
                         if(engineOpponent) {
                           SendToProgram("force\n", engineOpponent); // suppress reply
                           SendMoveToProgram(forwardMostMove-1, engineOpponent); /* make sure opponent gets to see move */
                         }
                         GameEnds( GameIsDrawn, "Xboard adjudication: 50-move rule", GE_XBOARD );
                         return 1;
                }

                /* if draw offer is pending, treat it as a draw claim
                 * when draw condition present, to allow engines a way to
                 * claim draws before making their move to avoid a race
                 * condition occurring after their move
                 */
                if((gameMode == TwoMachinesPlay ? second.offeredDraw : userOfferedDraw) || first.offeredDraw ) {
                         char *p = NULL;
                         if((signed char)boards[forwardMostMove][EP_STATUS] == EP_RULE_DRAW)
                             p = "Draw claim: 50-move rule";
                         if((signed char)boards[forwardMostMove][EP_STATUS] == EP_REP_DRAW)
                             p = "Draw claim: 3-fold repetition";
                         if((signed char)boards[forwardMostMove][EP_STATUS] == EP_INSUF_DRAW)
                             p = "Draw claim: insufficient mating material";
                         if( p != NULL && canAdjudicate) {
                             if(engineOpponent) {
                               SendToProgram("force\n", engineOpponent); // suppress reply
                               SendMoveToProgram(forwardMostMove-1, engineOpponent); /* make sure opponent gets to see move */
                             }
                             GameEnds( GameIsDrawn, p, GE_XBOARD );
                             return 1;
                         }
                }

                if( canAdjudicate && appData.adjudicateDrawMoves > 0 && forwardMostMove > (2*appData.adjudicateDrawMoves) ) {
                    if(engineOpponent) {
                      SendToProgram("force\n", engineOpponent); // suppress reply
                      SendMoveToProgram(forwardMostMove-1, engineOpponent); /* make sure opponent gets to see move */
                    }
                    GameEnds( GameIsDrawn, "Xboard adjudication: long game", GE_XBOARD );
                    return 1;
                }
        return 0;
}

char *
SendMoveToBookUser (int moveNr, ChessProgramState *cps, int initial)
{   // [HGM] book: this routine intercepts moves to simulate book replies
    char *bookHit = NULL;

    //first determine if the incoming move brings opponent into his book
    if(appData.usePolyglotBook && (cps == &first ? !appData.firstHasOwnBookUCI : !appData.secondHasOwnBookUCI))
        bookHit = ProbeBook(moveNr+1, appData.polyglotBook); // returns move
    if(appData.debugMode) fprintf(debugFP, "book hit = %s\n", bookHit ? bookHit : "(NULL)");
    if(bookHit != NULL && !cps->bookSuspend) {
        // make sure opponent is not going to reply after receiving move to book position
        SendToProgram("force\n", cps);
        cps->bookSuspend = TRUE; // flag indicating it has to be restarted
    }
    if(!initial) SendMoveToProgram(moveNr, cps); // with hit on initial position there is no move
    // now arrange restart after book miss
    if(bookHit) {
        // after a book hit we never send 'go', and the code after the call to this routine
        // has '&& !bookHit' added to suppress potential sending there (based on 'firstMove').
        char buf[MSG_SIZ], *move = bookHit;
        if(cps->useSAN) {
            int fromX, fromY, toX, toY;
            char promoChar;
            ChessMove moveType;
            move = buf + 30;
            if (ParseOneMove(bookHit, forwardMostMove, &moveType,
                                 &fromX, &fromY, &toX, &toY, &promoChar)) {
                (void) CoordsToAlgebraic(boards[forwardMostMove],
                                    PosFlags(forwardMostMove),
                                    fromY, fromX, toY, toX, promoChar, move);
            } else {
                if(appData.debugMode) fprintf(debugFP, "Book move could not be parsed\n");
                bookHit = NULL;
            }
        }
        snprintf(buf, MSG_SIZ, "%s%s\n", (cps->useUsermove ? "usermove " : ""), move); // force book move into program supposed to play it
        SendToProgram(buf, cps);
        if(!initial) firstMove = FALSE; // normally we would clear the firstMove condition after return & sending 'go'
    } else if(initial) { // 'go' was needed irrespective of firstMove, and it has to be done in this routine
        SendToProgram("go\n", cps);
        cps->bookSuspend = FALSE; // after a 'go' we are never suspended
    } else { // 'go' might be sent based on 'firstMove' after this routine returns
        if(cps->bookSuspend && !firstMove) // 'go' needed, and it will not be done after we return
            SendToProgram("go\n", cps);
        cps->bookSuspend = FALSE; // anyhow, we will not be suspended after a miss
    }
    return bookHit; // notify caller of hit, so it can take action to send move to opponent
}

char *savedMessage;
ChessProgramState *savedState;
void
DeferredBookMove (void)
{
        if(savedState->lastPing != savedState->lastPong)
                    ScheduleDelayedEvent(DeferredBookMove, 10);
        else
        HandleMachineMove(savedMessage, savedState);
}

static int savedWhitePlayer, savedBlackPlayer, pairingReceived;

void
HandleMachineMove (char *message, ChessProgramState *cps)
{
    char machineMove[MSG_SIZ], buf1[MSG_SIZ*10], buf2[MSG_SIZ];
    char realname[MSG_SIZ];
    int fromX, fromY, toX, toY;
    ChessMove moveType;
    char promoChar;
    char *p, *pv=buf1;
    int machineWhite;
    char *bookHit;

    if(cps == &pairing && sscanf(message, "%d-%d", &savedWhitePlayer, &savedBlackPlayer) == 2) {
        // [HGM] pairing: Mega-hack! Pairing engine also uses this routine (so it could give other WB commands).
        if(savedWhitePlayer == 0 || savedBlackPlayer == 0) {
            DisplayError(_("Invalid pairing from pairing engine"), 0);
            return;
        }
        pairingReceived = 1;
        NextMatchGame();
        return; // Skim the pairing messages here.
    }

    cps->userError = 0;

FakeBookMove: // [HGM] book: we jump here to simulate machine moves after book hit
    /*
     * Kludge to ignore BEL characters
     */
    while (*message == '\007') message++;

    /*
     * [HGM] engine debug message: ignore lines starting with '#' character
     */
    if(cps->debug && *message == '#') return;

    /*
     * Look for book output
     */
    if (cps == &first && bookRequested) {
        if (message[0] == '\t' || message[0] == ' ') {
            /* Part of the book output is here; append it */
            strcat(bookOutput, message);
            strcat(bookOutput, "  \n");
            return;
        } else if (bookOutput[0] != NULLCHAR) {
            /* All of book output has arrived; display it */
            char *p = bookOutput;
            while (*p != NULLCHAR) {
                if (*p == '\t') *p = ' ';
                p++;
            }
            DisplayInformation(bookOutput);
            bookRequested = FALSE;
            /* Fall through to parse the current output */
        }
    }

    /*
     * Look for machine move.
     */
    if ((sscanf(message, "%s %s %s", buf1, buf2, machineMove) == 3 && strcmp(buf2, "...") == 0) ||
        (sscanf(message, "%s %s", buf1, machineMove) == 2 && strcmp(buf1, "move") == 0))
    {
        /* This method is only useful on engines that support ping */
        if (cps->lastPing != cps->lastPong) {
          if (gameMode == BeginningOfGame) {
            /* Extra move from before last new; ignore */
            if (appData.debugMode) {
                fprintf(debugFP, "Ignoring extra move from %s\n", cps->which);
            }
          } else {
            if (appData.debugMode) {
                fprintf(debugFP, "Undoing extra move from %s, gameMode %d\n",
                        cps->which, gameMode);
            }

            SendToProgram("undo\n", cps);
          }
          return;
        }

        switch (gameMode) {
          case BeginningOfGame:
            /* Extra move from before last reset; ignore */
            if (appData.debugMode) {
                fprintf(debugFP, "Ignoring extra move from %s\n", cps->which);
            }
            return;

          case EndOfGame:
          case IcsIdle:
          default:
            /* Extra move after we tried to stop.  The mode test is
               not a reliable way of detecting this problem, but it's
               the best we can do on engines that don't support ping.
            */
            if (appData.debugMode) {
                fprintf(debugFP, "Undoing extra move from %s, gameMode %d\n",
                        cps->which, gameMode);
            }
            SendToProgram("undo\n", cps);
            return;

          case MachinePlaysWhite:
          case IcsPlayingWhite:
            machineWhite = TRUE;
            break;

          case MachinePlaysBlack:
          case IcsPlayingBlack:
            machineWhite = FALSE;
            break;

          case TwoMachinesPlay:
            machineWhite = (cps->twoMachinesColor[0] == 'w');
            break;
        }
        if (WhiteOnMove(forwardMostMove) != machineWhite) {
            if (appData.debugMode) {
                fprintf(debugFP,
                        "Ignoring move out of turn by %s, gameMode %d"
                        ", forwardMost %d\n",
                        cps->which, gameMode, forwardMostMove);
            }
            return;
        }

        if(cps->alphaRank) AlphaRank(machineMove, 4);
        if (!ParseOneMove(machineMove, forwardMostMove, &moveType,
                              &fromX, &fromY, &toX, &toY, &promoChar)) {
            /* Machine move could not be parsed; ignore it. */
          snprintf(buf1, MSG_SIZ*10, _("Illegal move \"%s\" from %s machine"),
                    machineMove, _(cps->which));
            DisplayError(buf1, 0);
            snprintf(buf1, MSG_SIZ*10, "Xboard: Forfeit due to invalid move: %s (%c%c%c%c) res=%d",
                    machineMove, fromX+AAA, fromY+ONE, toX+AAA, toY+ONE, moveType);
            if (gameMode == TwoMachinesPlay) {
              GameEnds(machineWhite ? BlackWins : WhiteWins,
                       buf1, GE_XBOARD);
            }
            return;
        }

        /* [HGM] Apparently legal, but so far only tested with EP_UNKOWN */
        /* So we have to redo legality test with true e.p. status here,  */
        /* to make sure an illegal e.p. capture does not slip through,   */
        /* to cause a forfeit on a justified illegal-move complaint      */
        /* of the opponent.                                              */
        if( gameMode==TwoMachinesPlay && appData.testLegality ) {
           ChessMove moveType;
           moveType = LegalityTest(boards[forwardMostMove], PosFlags(forwardMostMove),
                             fromY, fromX, toY, toX, promoChar);
            if(moveType == IllegalMove) {
              snprintf(buf1, MSG_SIZ*10, "Xboard: Forfeit due to illegal move: %s (%c%c%c%c)%c",
                        machineMove, fromX+AAA, fromY+ONE, toX+AAA, toY+ONE, 0);
                GameEnds(machineWhite ? BlackWins : WhiteWins,
                           buf1, GE_XBOARD);
                return;
           } else if(gameInfo.variant != VariantFischeRandom && gameInfo.variant != VariantCapaRandom)
           /* [HGM] Kludge to handle engines that send FRC-style castling
              when they shouldn't (like TSCP-Gothic) */
           switch(moveType) {
             case WhiteASideCastleFR:
             case BlackASideCastleFR:
               toX+=2;
               currentMoveString[2]++;
               break;
             case WhiteHSideCastleFR:
             case BlackHSideCastleFR:
               toX--;
               currentMoveString[2]--;
               break;
             default: ; // nothing to do, but suppresses warning of pedantic compilers
           }
        }
        hintRequested = FALSE;
        lastHint[0] = NULLCHAR;
        bookRequested = FALSE;
        /* Program may be pondering now */
        cps->maybeThinking = TRUE;
        if (cps->sendTime == 2) cps->sendTime = 1;
        if (cps->offeredDraw) cps->offeredDraw--;

        /* [AS] Save move info*/
        pvInfoList[ forwardMostMove ].score = programStats.score;
        pvInfoList[ forwardMostMove ].depth = programStats.depth;
        pvInfoList[ forwardMostMove ].time =  programStats.time; // [HGM] PGNtime: take time from engine stats

        MakeMove(fromX, fromY, toX, toY, promoChar);/*updates forwardMostMove*/

        /* [AS] Adjudicate game if needed (note: remember that forwardMostMove now points past the last move) */
        if( gameMode == TwoMachinesPlay && adjudicateLossThreshold != 0 && forwardMostMove >= adjudicateLossPlies ) {
            int count = 0;

            while( count < adjudicateLossPlies ) {
                int score = pvInfoList[ forwardMostMove - count - 1 ].score;

                if( count & 1 ) {
                    score = -score; /* Flip score for winning side */
                }

                if( score > adjudicateLossThreshold ) {
                    break;
                }

                count++;
            }

            if( count >= adjudicateLossPlies ) {
                ShowMove(fromX, fromY, toX, toY); /*updates currentMove*/

                GameEnds( WhiteOnMove(forwardMostMove) ? WhiteWins : BlackWins,
                    "Xboard adjudication",
                    GE_XBOARD );

                return;
            }
        }

        if(Adjudicate(cps)) {
            ShowMove(fromX, fromY, toX, toY); /*updates currentMove*/
            return; // [HGM] adjudicate: for all automatic game ends
        }

#if ZIPPY
        if ((gameMode == IcsPlayingWhite || gameMode == IcsPlayingBlack) &&
            first.initDone) {
          if(cps->offeredDraw && (signed char)boards[forwardMostMove][EP_STATUS] <= EP_DRAWS) {
                SendToICS(ics_prefix); // [HGM] drawclaim: send caim and move on one line for FICS
                SendToICS("draw ");
                SendMoveToICS(moveType, fromX, fromY, toX, toY, promoChar);
          }
          SendMoveToICS(moveType, fromX, fromY, toX, toY, promoChar);
          ics_user_moved = 1;
          if(appData.autoKibitz && !appData.icsEngineAnalyze ) { /* [HGM] kibitz: send most-recent PV info to ICS */
                char buf[3*MSG_SIZ];

                snprintf(buf, 3*MSG_SIZ, "kibitz !!! %+.2f/%d (%.2f sec, %u nodes, %.0f knps) PV=%s\n",
                        programStats.score / 100.,
                        programStats.depth,
                        programStats.time / 100.,
                        (unsigned int)programStats.nodes,
                        (unsigned int)programStats.nodes / (10*abs(programStats.time) + 1.),
                        programStats.movelist);
                SendToICS(buf);
if(appData.debugMode) fprintf(debugFP, "nodes = %d, %lld\n", (int) programStats.nodes, programStats.nodes);
          }
        }
#endif

        /* [AS] Clear stats for next move */
        ClearProgramStats();
        thinkOutput[0] = NULLCHAR;
        hiddenThinkOutputState = 0;

        bookHit = NULL;
        if (gameMode == TwoMachinesPlay) {
            /* [HGM] relaying draw offers moved to after reception of move */
            /* and interpreting offer as claim if it brings draw condition */
            if (cps->offeredDraw == 1 && cps->other->sendDrawOffers) {
                SendToProgram("draw\n", cps->other);
            }
            if (cps->other->sendTime) {
                SendTimeRemaining(cps->other,
                                  cps->other->twoMachinesColor[0] == 'w');
            }
            bookHit = SendMoveToBookUser(forwardMostMove-1, cps->other, FALSE);
            if (firstMove && !bookHit) {
                firstMove = FALSE;
                if (cps->other->useColors) {
                  SendToProgram(cps->other->twoMachinesColor, cps->other);
                }
                SendToProgram("go\n", cps->other);
            }
            cps->other->maybeThinking = TRUE;
        }

        ShowMove(fromX, fromY, toX, toY); /*updates currentMove*/

        if (!pausing && appData.ringBellAfterMoves) {
            RingBell();
        }

        /*
         * Reenable menu items that were disabled while
         * machine was thinking
         */
        if (gameMode != TwoMachinesPlay)
            SetUserThinkingEnables();

        // [HGM] book: after book hit opponent has received move and is now in force mode
        // force the book reply into it, and then fake that it outputted this move by jumping
        // back to the beginning of HandleMachineMove, with cps toggled and message set to this move
        if(bookHit) {
                static char bookMove[MSG_SIZ]; // a bit generous?

                safeStrCpy(bookMove, "move ", sizeof(bookMove)/sizeof(bookMove[0]));
                strcat(bookMove, bookHit);
                message = bookMove;
                cps = cps->other;
                programStats.nodes = programStats.depth = programStats.time =
                programStats.score = programStats.got_only_move = 0;
                sprintf(programStats.movelist, "%s (xbook)", bookHit);

                if(cps->lastPing != cps->lastPong) {
                    savedMessage = message; // args for deferred call
                    savedState = cps;
                    ScheduleDelayedEvent(DeferredBookMove, 10);
                    return;
                }
                goto FakeBookMove;
        }

        return;
    }

    /* Set special modes for chess engines.  Later something general
     *  could be added here; for now there is just one kludge feature,
     *  needed because Crafty 15.10 and earlier don't ignore SIGINT
     *  when "xboard" is given as an interactive command.
     */
    if (strncmp(message, "kibitz Hello from Crafty", 24) == 0) {
        cps->useSigint = FALSE;
        cps->useSigterm = FALSE;
    }
    if (strncmp(message, "feature ", 8) == 0) { // [HGM] moved forward to pre-empt non-compliant commands
      ParseFeatures(message+8, cps);
      return; // [HGM] This return was missing, causing option features to be recognized as non-compliant commands!
    }

    if ((!appData.testLegality || gameInfo.variant == VariantFairy) && 
                                        !strncmp(message, "setup ", 6)) { // [HGM] allow first engine to define opening position
      int dummy, s=6; char buf[MSG_SIZ];
      if(appData.icsActive || forwardMostMove != 0 || cps != &first) return;
      if(sscanf(message, "setup (%s", buf) == 1) s = 8 + strlen(buf), buf[s-9] = NULLCHAR, SetCharTable(pieceToChar, buf);
      if(startedFromSetupPosition) return;
      ParseFEN(boards[0], &dummy, message+s);
      DrawPosition(TRUE, boards[0]);
      startedFromSetupPosition = TRUE;
      return;
    }
    /* [HGM] Allow engine to set up a position. Don't ask me why one would
     * want this, I was asked to put it in, and obliged.
     */
    if (!strncmp(message, "setboard ", 9)) {
        Board initial_position;

        GameEnds(GameUnfinished, "Engine aborts game", GE_XBOARD);

        if (!ParseFEN(initial_position, &blackPlaysFirst, message + 9)) {
            DisplayError(_("Bad FEN received from engine"), 0);
            return ;
        } else {
           Reset(TRUE, FALSE);
           CopyBoard(boards[0], initial_position);
           initialRulePlies = FENrulePlies;
           if(blackPlaysFirst) gameMode = MachinePlaysWhite;
           else gameMode = MachinePlaysBlack;
           DrawPosition(FALSE, boards[currentMove]);
        }
        return;
    }

    /*
     * Look for communication commands
     */
    if (!strncmp(message, "telluser ", 9)) {
        if(message[9] == '\\' && message[10] == '\\')
            EscapeExpand(message+9, message+11); // [HGM] esc: allow escape sequences in popup box
        PlayTellSound();
        DisplayNote(message + 9);
        return;
    }
    if (!strncmp(message, "tellusererror ", 14)) {
        cps->userError = 1;
        if(message[14] == '\\' && message[15] == '\\')
            EscapeExpand(message+14, message+16); // [HGM] esc: allow escape sequences in popup box
        PlayTellSound();
        DisplayError(message + 14, 0);
        return;
    }
    if (!strncmp(message, "tellopponent ", 13)) {
      if (appData.icsActive) {
        if (loggedOn) {
          snprintf(buf1, sizeof(buf1), "%ssay %s\n", ics_prefix, message + 13);
          SendToICS(buf1);
        }
      } else {
        DisplayNote(message + 13);
      }
      return;
    }
    if (!strncmp(message, "tellothers ", 11)) {
      if (appData.icsActive) {
        if (loggedOn) {
          snprintf(buf1, sizeof(buf1), "%swhisper %s\n", ics_prefix, message + 11);
          SendToICS(buf1);
        }
      }
      return;
    }
    if (!strncmp(message, "tellall ", 8)) {
      if (appData.icsActive) {
        if (loggedOn) {
          snprintf(buf1, sizeof(buf1), "%skibitz %s\n", ics_prefix, message + 8);
          SendToICS(buf1);
        }
      } else {
        DisplayNote(message + 8);
      }
      return;
    }
    if (strncmp(message, "warning", 7) == 0) {
        /* Undocumented feature, use tellusererror in new code */
        DisplayError(message, 0);
        return;
    }
    if (sscanf(message, "askuser %s %[^\n]", buf1, buf2) == 2) {
        safeStrCpy(realname, cps->tidy, sizeof(realname)/sizeof(realname[0]));
        strcat(realname, " query");
        AskQuestion(realname, buf2, buf1, cps->pr);
        return;
    }
    /* Commands from the engine directly to ICS.  We don't allow these to be
     *  sent until we are logged on. Crafty kibitzes have been known to
     *  interfere with the login process.
     */
    if (loggedOn) {
        if (!strncmp(message, "tellics ", 8)) {
            SendToICS(message + 8);
            SendToICS("\n");
            return;
        }
        if (!strncmp(message, "tellicsnoalias ", 15)) {
            SendToICS(ics_prefix);
            SendToICS(message + 15);
            SendToICS("\n");
            return;
        }
        /* The following are for backward compatibility only */
        if (!strncmp(message,"whisper",7) || !strncmp(message,"kibitz",6) ||
            !strncmp(message,"draw",4) || !strncmp(message,"tell",3)) {
            SendToICS(ics_prefix);
            SendToICS(message);
            SendToICS("\n");
            return;
        }
    }
    if (sscanf(message, "pong %d", &cps->lastPong) == 1) {
        return;
    }
    /*
     * If the move is illegal, cancel it and redraw the board.
     * Also deal with other error cases.  Matching is rather loose
     * here to accommodate engines written before the spec.
     */
    if (strncmp(message + 1, "llegal move", 11) == 0 ||
        strncmp(message, "Error", 5) == 0) {
        if (StrStr(message, "name") ||
            StrStr(message, "rating") || StrStr(message, "?") ||
            StrStr(message, "result") || StrStr(message, "board") ||
            StrStr(message, "bk") || StrStr(message, "computer") ||
            StrStr(message, "variant") || StrStr(message, "hint") ||
            StrStr(message, "random") || StrStr(message, "depth") ||
            StrStr(message, "accepted")) {
            return;
        }
        if (StrStr(message, "protover")) {
          /* Program is responding to input, so it's apparently done
             initializing, and this error message indicates it is
             protocol version 1.  So we don't need to wait any longer
             for it to initialize and send feature commands. */
          FeatureDone(cps, 1);
          cps->protocolVersion = 1;
          return;
        }
        cps->maybeThinking = FALSE;

        if (StrStr(message, "draw")) {
            /* Program doesn't have "draw" command */
            cps->sendDrawOffers = 0;
            return;
        }
        if (cps->sendTime != 1 &&
            (StrStr(message, "time") || StrStr(message, "otim"))) {
          /* Program apparently doesn't have "time" or "otim" command */
          cps->sendTime = 0;
          return;
        }
        if (StrStr(message, "analyze")) {
            cps->analysisSupport = FALSE;
            cps->analyzing = FALSE;
//          Reset(FALSE, TRUE); // [HGM] this caused discrepancy between display and internal state!
            EditGameEvent(); // [HGM] try to preserve loaded game
            snprintf(buf2,MSG_SIZ, _("%s does not support analysis"), cps->tidy);
            DisplayError(buf2, 0);
            return;
        }
        if (StrStr(message, "(no matching move)st")) {
          /* Special kludge for GNU Chess 4 only */
          cps->stKludge = TRUE;
          SendTimeControl(cps, movesPerSession, timeControl,
                          timeIncrement, appData.searchDepth,
                          searchTime);
          return;
        }
        if (StrStr(message, "(no matching move)sd")) {
          /* Special kludge for GNU Chess 4 only */
          cps->sdKludge = TRUE;
          SendTimeControl(cps, movesPerSession, timeControl,
                          timeIncrement, appData.searchDepth,
                          searchTime);
          return;
        }
        if (!StrStr(message, "llegal")) {
            return;
        }
        if (gameMode == BeginningOfGame || gameMode == EndOfGame ||
            gameMode == IcsIdle) return;
        if (forwardMostMove <= backwardMostMove) return;
        if (pausing) PauseEvent();
      if(appData.forceIllegal) {
            // [HGM] illegal: machine refused move; force position after move into it
          SendToProgram("force\n", cps);
          if(!cps->useSetboard) { // hideous kludge on kludge, because SendBoard sucks.
                // we have a real problem now, as SendBoard will use the a2a3 kludge
                // when black is to move, while there might be nothing on a2 or black
                // might already have the move. So send the board as if white has the move.
                // But first we must change the stm of the engine, as it refused the last move
                SendBoard(cps, 0); // always kludgeless, as white is to move on boards[0]
                if(WhiteOnMove(forwardMostMove)) {
                    SendToProgram("a7a6\n", cps); // for the engine black still had the move
                    SendBoard(cps, forwardMostMove); // kludgeless board
                } else {
                    SendToProgram("a2a3\n", cps); // for the engine white still had the move
                    CopyBoard(boards[forwardMostMove+1], boards[forwardMostMove]);
                    SendBoard(cps, forwardMostMove+1); // kludgeless board
                }
          } else SendBoard(cps, forwardMostMove); // FEN case, also sets stm properly
            if(gameMode == MachinePlaysWhite || gameMode == MachinePlaysBlack ||
                 gameMode == TwoMachinesPlay)
              SendToProgram("go\n", cps);
            return;
      } else
        if (gameMode == PlayFromGameFile) {
            /* Stop reading this game file */
            gameMode = EditGame;
            ModeHighlight();
        }
        /* [HGM] illegal-move claim should forfeit game when Xboard */
        /* only passes fully legal moves                            */
        if( appData.testLegality && gameMode == TwoMachinesPlay ) {
            GameEnds( cps->twoMachinesColor[0] == 'w' ? BlackWins : WhiteWins,
                                "False illegal-move claim", GE_XBOARD );
            return; // do not take back move we tested as valid
        }
        currentMove = forwardMostMove-1;
        DisplayMove(currentMove-1); /* before DisplayMoveError */
        SwitchClocks(forwardMostMove-1); // [HGM] race
        DisplayBothClocks();
        snprintf(buf1, 10*MSG_SIZ, _("Illegal move \"%s\" (rejected by %s chess program)"),
                parseList[currentMove], _(cps->which));
        DisplayMoveError(buf1);
        DrawPosition(FALSE, boards[currentMove]);

        SetUserThinkingEnables();
        return;
    }
    if (strncmp(message, "time", 4) == 0 && StrStr(message, "Illegal")) {
        /* Program has a broken "time" command that
           outputs a string not ending in newline.
           Don't use it. */
        cps->sendTime = 0;
    }

    /*
     * If chess program startup fails, exit with an error message.
     * Attempts to recover here are futile.
     */
    if ((StrStr(message, "unknown host") != NULL)
        || (StrStr(message, "No remote directory") != NULL)
        || (StrStr(message, "not found") != NULL)
        || (StrStr(message, "No such file") != NULL)
        || (StrStr(message, "can't alloc") != NULL)
        || (StrStr(message, "Permission denied") != NULL)) {

        cps->maybeThinking = FALSE;
        snprintf(buf1, sizeof(buf1), _("Failed to start %s chess program %s on %s: %s\n"),
                _(cps->which), cps->program, cps->host, message);
        RemoveInputSource(cps->isr);
        if(appData.icsActive) DisplayFatalError(buf1, 0, 1); else {
            if(cps == &first) appData.noChessProgram = TRUE;
            DisplayError(buf1, 0);
        }
        return;
    }

    /*
     * Look for hint output
     */
    if (sscanf(message, "Hint: %s", buf1) == 1) {
        if (cps == &first && hintRequested) {
            hintRequested = FALSE;
            if (ParseOneMove(buf1, forwardMostMove, &moveType,
                                 &fromX, &fromY, &toX, &toY, &promoChar)) {
                (void) CoordsToAlgebraic(boards[forwardMostMove],
                                    PosFlags(forwardMostMove),
                                    fromY, fromX, toY, toX, promoChar, buf1);
                snprintf(buf2, sizeof(buf2), _("Hint: %s"), buf1);
                DisplayInformation(buf2);
            } else {
                /* Hint move could not be parsed!? */
              snprintf(buf2, sizeof(buf2),
                        _("Illegal hint move \"%s\"\nfrom %s chess program"),
                        buf1, _(cps->which));
                DisplayError(buf2, 0);
            }
        } else {
          safeStrCpy(lastHint, buf1, sizeof(lastHint)/sizeof(lastHint[0]));
        }
        return;
    }

    /*
     * Ignore other messages if game is not in progress
     */
    if (gameMode == BeginningOfGame || gameMode == EndOfGame ||
        gameMode == IcsIdle || cps->lastPing != cps->lastPong) return;

    /*
     * look for win, lose, draw, or draw offer
     */
    if (strncmp(message, "1-0", 3) == 0) {
        char *p, *q, *r = "";
        p = strchr(message, '{');
        if (p) {
            q = strchr(p, '}');
            if (q) {
                *q = NULLCHAR;
                r = p + 1;
            }
        }
        GameEnds(WhiteWins, r, GE_ENGINE1 + (cps != &first)); /* [HGM] pass claimer indication for claim test */
        return;
    } else if (strncmp(message, "0-1", 3) == 0) {
        char *p, *q, *r = "";
        p = strchr(message, '{');
        if (p) {
            q = strchr(p, '}');
            if (q) {
                *q = NULLCHAR;
                r = p + 1;
            }
        }
        /* Kludge for Arasan 4.1 bug */
        if (strcmp(r, "Black resigns") == 0) {
            GameEnds(WhiteWins, r, GE_ENGINE1 + (cps != &first));
            return;
        }
        GameEnds(BlackWins, r, GE_ENGINE1 + (cps != &first));
        return;
    } else if (strncmp(message, "1/2", 3) == 0) {
        char *p, *q, *r = "";
        p = strchr(message, '{');
        if (p) {
            q = strchr(p, '}');
            if (q) {
                *q = NULLCHAR;
                r = p + 1;
            }
        }

        GameEnds(GameIsDrawn, r, GE_ENGINE1 + (cps != &first));
        return;

    } else if (strncmp(message, "White resign", 12) == 0) {
        GameEnds(BlackWins, "White resigns", GE_ENGINE1 + (cps != &first));
        return;
    } else if (strncmp(message, "Black resign", 12) == 0) {
        GameEnds(WhiteWins, "Black resigns", GE_ENGINE1 + (cps != &first));
        return;
    } else if (strncmp(message, "White matches", 13) == 0 ||
               strncmp(message, "Black matches", 13) == 0   ) {
        /* [HGM] ignore GNUShogi noises */
        return;
    } else if (strncmp(message, "White", 5) == 0 &&
               message[5] != '(' &&
               StrStr(message, "Black") == NULL) {
        GameEnds(WhiteWins, "White mates", GE_ENGINE1 + (cps != &first));
        return;
    } else if (strncmp(message, "Black", 5) == 0 &&
               message[5] != '(') {
        GameEnds(BlackWins, "Black mates", GE_ENGINE1 + (cps != &first));
        return;
    } else if (strcmp(message, "resign") == 0 ||
               strcmp(message, "computer resigns") == 0) {
        switch (gameMode) {
          case MachinePlaysBlack:
          case IcsPlayingBlack:
            GameEnds(WhiteWins, "Black resigns", GE_ENGINE);
            break;
          case MachinePlaysWhite:
          case IcsPlayingWhite:
            GameEnds(BlackWins, "White resigns", GE_ENGINE);
            break;
          case TwoMachinesPlay:
            if (cps->twoMachinesColor[0] == 'w')
              GameEnds(BlackWins, "White resigns", GE_ENGINE1 + (cps != &first));
            else
              GameEnds(WhiteWins, "Black resigns", GE_ENGINE1 + (cps != &first));
            break;
          default:
            /* can't happen */
            break;
        }
        return;
    } else if (strncmp(message, "opponent mates", 14) == 0) {
        switch (gameMode) {
          case MachinePlaysBlack:
          case IcsPlayingBlack:
            GameEnds(WhiteWins, "White mates", GE_ENGINE);
            break;
          case MachinePlaysWhite:
          case IcsPlayingWhite:
            GameEnds(BlackWins, "Black mates", GE_ENGINE);
            break;
          case TwoMachinesPlay:
            if (cps->twoMachinesColor[0] == 'w')
              GameEnds(BlackWins, "Black mates", GE_ENGINE1 + (cps != &first));
            else
              GameEnds(WhiteWins, "White mates", GE_ENGINE1 + (cps != &first));
            break;
          default:
            /* can't happen */
            break;
        }
        return;
    } else if (strncmp(message, "computer mates", 14) == 0) {
        switch (gameMode) {
          case MachinePlaysBlack:
          case IcsPlayingBlack:
            GameEnds(BlackWins, "Black mates", GE_ENGINE1);
            break;
          case MachinePlaysWhite:
          case IcsPlayingWhite:
            GameEnds(WhiteWins, "White mates", GE_ENGINE);
            break;
          case TwoMachinesPlay:
            if (cps->twoMachinesColor[0] == 'w')
              GameEnds(WhiteWins, "White mates", GE_ENGINE1 + (cps != &first));
            else
              GameEnds(BlackWins, "Black mates", GE_ENGINE1 + (cps != &first));
            break;
          default:
            /* can't happen */
            break;
        }
        return;
    } else if (strncmp(message, "checkmate", 9) == 0) {
        if (WhiteOnMove(forwardMostMove)) {
            GameEnds(BlackWins, "Black mates", GE_ENGINE1 + (cps != &first));
        } else {
            GameEnds(WhiteWins, "White mates", GE_ENGINE1 + (cps != &first));
        }
        return;
    } else if (strstr(message, "Draw") != NULL ||
               strstr(message, "game is a draw") != NULL) {
        GameEnds(GameIsDrawn, "Draw", GE_ENGINE1 + (cps != &first));
        return;
    } else if (strstr(message, "offer") != NULL &&
               strstr(message, "draw") != NULL) {
#if ZIPPY
        if (appData.zippyPlay && first.initDone) {
            /* Relay offer to ICS */
            SendToICS(ics_prefix);
            SendToICS("draw\n");
        }
#endif
        cps->offeredDraw = 2; /* valid until this engine moves twice */
        if (gameMode == TwoMachinesPlay) {
            if (cps->other->offeredDraw) {
                GameEnds(GameIsDrawn, "Draw agreed", GE_XBOARD);
            /* [HGM] in two-machine mode we delay relaying draw offer      */
            /* until after we also have move, to see if it is really claim */
            }
        } else if (gameMode == MachinePlaysWhite ||
                   gameMode == MachinePlaysBlack) {
          if (userOfferedDraw) {
            DisplayInformation(_("Machine accepts your draw offer"));
            GameEnds(GameIsDrawn, "Draw agreed", GE_XBOARD);
          } else {
            DisplayInformation(_("Machine offers a draw\nSelect Action / Draw to agree"));
          }
        }
    }


    /*
     * Look for thinking output
     */
    if ( appData.showThinking // [HGM] thinking: test all options that cause this output
          || !appData.hideThinkingFromHuman || appData.adjudicateLossThreshold != 0 || EngineOutputIsUp()
                                ) {
        int plylev, mvleft, mvtot, curscore, time;
        char mvname[MOVE_LEN];
        u64 nodes; // [DM]
        char plyext;
        int ignore = FALSE;
        int prefixHint = FALSE;
        mvname[0] = NULLCHAR;

        switch (gameMode) {
          case MachinePlaysBlack:
          case IcsPlayingBlack:
            if (WhiteOnMove(forwardMostMove)) prefixHint = TRUE;
            break;
          case MachinePlaysWhite:
          case IcsPlayingWhite:
            if (!WhiteOnMove(forwardMostMove)) prefixHint = TRUE;
            break;
          case AnalyzeMode:
          case AnalyzeFile:
            break;
          case IcsObserving: /* [DM] icsEngineAnalyze */
            if (!appData.icsEngineAnalyze) ignore = TRUE;
            break;
          case TwoMachinesPlay:
            if ((cps->twoMachinesColor[0] == 'w') != WhiteOnMove(forwardMostMove)) {
                ignore = TRUE;
            }
            break;
          default:
            ignore = TRUE;
            break;
        }

        if (!ignore) {
            ChessProgramStats tempStats = programStats; // [HGM] info: filter out info lines
            buf1[0] = NULLCHAR;
            if (sscanf(message, "%d%c %d %d " u64Display " %[^\n]\n",
                       &plylev, &plyext, &curscore, &time, &nodes, buf1) >= 5) {

                if (plyext != ' ' && plyext != '\t') {
                    time *= 100;
                }

                /* [AS] Negate score if machine is playing black and reporting absolute scores */
                if( cps->scoreIsAbsolute &&
                    ( gameMode == MachinePlaysBlack ||
                      gameMode == TwoMachinesPlay && cps->twoMachinesColor[0] == 'b' ||
                      gameMode == IcsPlayingBlack ||     // [HGM] also add other situations where engine should report black POV
                     (gameMode == AnalyzeMode || gameMode == AnalyzeFile || gameMode == IcsObserving && appData.icsEngineAnalyze) &&
                     !WhiteOnMove(currentMove)
                    ) )
                {
                    curscore = -curscore;
                }

                if(appData.pvSAN[cps==&second]) pv = PvToSAN(buf1);

                if(serverMoves && (time > 100 || time == 0 && plylev > 7)) {
                        char buf[MSG_SIZ];
                        FILE *f;
                        snprintf(buf, MSG_SIZ, "%s", appData.serverMovesName);
                        buf[strlen(buf)-1] = gameMode == MachinePlaysWhite ? 'w' :
                                             gameMode == MachinePlaysBlack ? 'b' : cps->twoMachinesColor[0];
                        if(appData.debugMode) fprintf(debugFP, "write PV on file '%s'\n", buf);
                        if(f = fopen(buf, "w")) { // export PV to applicable PV file
                                fprintf(f, "%5.2f/%-2d %s", curscore/100., plylev, pv);
                                fclose(f);
                        } else DisplayError(_("failed writing PV"), 0);
                }

                tempStats.depth = plylev;
                tempStats.nodes = nodes;
                tempStats.time = time;
                tempStats.score = curscore;
                tempStats.got_only_move = 0;

                if(cps->nps >= 0) { /* [HGM] nps: use engine nodes or time to decrement clock */
                        int ticklen;

                        if(cps->nps == 0) ticklen = 10*time;                    // use engine reported time
                        else ticklen = (1000. * u64ToDouble(nodes)) / cps->nps; // convert node count to time
                        if(WhiteOnMove(forwardMostMove) && (gameMode == MachinePlaysWhite ||
                                                gameMode == TwoMachinesPlay && cps->twoMachinesColor[0] == 'w'))
                             whiteTimeRemaining = timeRemaining[0][forwardMostMove] - ticklen;
                        if(!WhiteOnMove(forwardMostMove) && (gameMode == MachinePlaysBlack ||
                                                gameMode == TwoMachinesPlay && cps->twoMachinesColor[0] == 'b'))
                             blackTimeRemaining = timeRemaining[1][forwardMostMove] - ticklen;
                }

                /* Buffer overflow protection */
                if (pv[0] != NULLCHAR) {
                    if (strlen(pv) >= sizeof(tempStats.movelist)
                        && appData.debugMode) {
                        fprintf(debugFP,
                                "PV is too long; using the first %u bytes.\n",
                                (unsigned) sizeof(tempStats.movelist) - 1);
                    }

                    safeStrCpy( tempStats.movelist, pv, sizeof(tempStats.movelist)/sizeof(tempStats.movelist[0]) );
                } else {
                    sprintf(tempStats.movelist, " no PV\n");
                }

                if (tempStats.seen_stat) {
                    tempStats.ok_to_send = 1;
                }

                if (strchr(tempStats.movelist, '(') != NULL) {
                    tempStats.line_is_book = 1;
                    tempStats.nr_moves = 0;
                    tempStats.moves_left = 0;
                } else {
                    tempStats.line_is_book = 0;
                }

                    if(tempStats.score != 0 || tempStats.nodes != 0 || tempStats.time != 0)
                        programStats = tempStats; // [HGM] info: only set stats if genuine PV and not an info line

                SendProgramStatsToFrontend( cps, &tempStats );

                /*
                    [AS] Protect the thinkOutput buffer from overflow... this
                    is only useful if buf1 hasn't overflowed first!
                */
                snprintf(thinkOutput, sizeof(thinkOutput)/sizeof(thinkOutput[0]), "[%d]%c%+.2f %s%s",
                         plylev,
                         (gameMode == TwoMachinesPlay ?
                          ToUpper(cps->twoMachinesColor[0]) : ' '),
                         ((double) curscore) / 100.0,
                         prefixHint ? lastHint : "",
                         prefixHint ? " " : "" );

                if( buf1[0] != NULLCHAR ) {
                    unsigned max_len = sizeof(thinkOutput) - strlen(thinkOutput) - 1;

                    if( strlen(pv) > max_len ) {
                        if( appData.debugMode) {
                            fprintf(debugFP,"PV is too long for thinkOutput, truncating.\n");
                        }
                        pv[max_len+1] = '\0';
                    }

                    strcat( thinkOutput, pv);
                }

                if (currentMove == forwardMostMove || gameMode == AnalyzeMode
                        || gameMode == AnalyzeFile || appData.icsEngineAnalyze) {
                    DisplayMove(currentMove - 1);
                }
                return;

            } else if ((p=StrStr(message, "(only move)")) != NULL) {
                /* crafty (9.25+) says "(only move) <move>"
                 * if there is only 1 legal move
                 */
                sscanf(p, "(only move) %s", buf1);
                snprintf(thinkOutput, sizeof(thinkOutput)/sizeof(thinkOutput[0]), "%s (only move)", buf1);
                sprintf(programStats.movelist, "%s (only move)", buf1);
                programStats.depth = 1;
                programStats.nr_moves = 1;
                programStats.moves_left = 1;
                programStats.nodes = 1;
                programStats.time = 1;
                programStats.got_only_move = 1;

                /* Not really, but we also use this member to
                   mean "line isn't going to change" (Crafty
                   isn't searching, so stats won't change) */
                programStats.line_is_book = 1;

                SendProgramStatsToFrontend( cps, &programStats );

                if (currentMove == forwardMostMove || gameMode==AnalyzeMode ||
                           gameMode == AnalyzeFile || appData.icsEngineAnalyze) {
                    DisplayMove(currentMove - 1);
                }
                return;
            } else if (sscanf(message,"stat01: %d " u64Display " %d %d %d %s",
                              &time, &nodes, &plylev, &mvleft,
                              &mvtot, mvname) >= 5) {
                /* The stat01: line is from Crafty (9.29+) in response
                   to the "." command */
                programStats.seen_stat = 1;
                cps->maybeThinking = TRUE;

                if (programStats.got_only_move || !appData.periodicUpdates)
                  return;

                programStats.depth = plylev;
                programStats.time = time;
                programStats.nodes = nodes;
                programStats.moves_left = mvleft;
                programStats.nr_moves = mvtot;
                safeStrCpy(programStats.move_name, mvname, sizeof(programStats.move_name)/sizeof(programStats.move_name[0]));
                programStats.ok_to_send = 1;
                programStats.movelist[0] = '\0';

                SendProgramStatsToFrontend( cps, &programStats );

                return;

            } else if (strncmp(message,"++",2) == 0) {
                /* Crafty 9.29+ outputs this */
                programStats.got_fail = 2;
                return;

            } else if (strncmp(message,"--",2) == 0) {
                /* Crafty 9.29+ outputs this */
                programStats.got_fail = 1;
                return;

            } else if (thinkOutput[0] != NULLCHAR &&
                       strncmp(message, "    ", 4) == 0) {
                unsigned message_len;

                p = message;
                while (*p && *p == ' ') p++;

                message_len = strlen( p );

                /* [AS] Avoid buffer overflow */
                if( sizeof(thinkOutput) - strlen(thinkOutput) - 1 > message_len ) {
                    strcat(thinkOutput, " ");
                    strcat(thinkOutput, p);
                }

                if( sizeof(programStats.movelist) - strlen(programStats.movelist) - 1 > message_len ) {
                    strcat(programStats.movelist, " ");
                    strcat(programStats.movelist, p);
                }

                if (currentMove == forwardMostMove || gameMode==AnalyzeMode ||
                           gameMode == AnalyzeFile || appData.icsEngineAnalyze) {
                    DisplayMove(currentMove - 1);
                }
                return;
            }
        }
        else {
            buf1[0] = NULLCHAR;

            if (sscanf(message, "%d%c %d %d " u64Display " %[^\n]\n",
                       &plylev, &plyext, &curscore, &time, &nodes, buf1) >= 5)
            {
                ChessProgramStats cpstats;

                if (plyext != ' ' && plyext != '\t') {
                    time *= 100;
                }

                /* [AS] Negate score if machine is playing black and reporting absolute scores */
                if( cps->scoreIsAbsolute && ((gameMode == MachinePlaysBlack) || (gameMode == TwoMachinesPlay && cps->twoMachinesColor[0] == 'b')) ) {
                    curscore = -curscore;
                }

                cpstats.depth = plylev;
                cpstats.nodes = nodes;
                cpstats.time = time;
                cpstats.score = curscore;
                cpstats.got_only_move = 0;
                cpstats.movelist[0] = '\0';

                if (buf1[0] != NULLCHAR) {
                    safeStrCpy( cpstats.movelist, buf1, sizeof(cpstats.movelist)/sizeof(cpstats.movelist[0]) );
                }

                cpstats.ok_to_send = 0;
                cpstats.line_is_book = 0;
                cpstats.nr_moves = 0;
                cpstats.moves_left = 0;

                SendProgramStatsToFrontend( cps, &cpstats );
            }
        }
    }
}


/* Parse a game score from the character string "game", and
   record it as the history of the current game.  The game
   score is NOT assumed to start from the standard position.
   The display is not updated in any way.
   */
void
ParseGameHistory (char *game)
{
    ChessMove moveType;
    int fromX, fromY, toX, toY, boardIndex;
    char promoChar;
    char *p, *q;
    char buf[MSG_SIZ];

    if (appData.debugMode)
      fprintf(debugFP, "Parsing game history: %s\n", game);

    if (gameInfo.event == NULL) gameInfo.event = StrSave("ICS game");
    gameInfo.site = StrSave(appData.icsHost);
    gameInfo.date = PGNDate();
    gameInfo.round = StrSave("-");

    /* Parse out names of players */
    while (*game == ' ') game++;
    p = buf;
    while (*game != ' ') *p++ = *game++;
    *p = NULLCHAR;
    gameInfo.white = StrSave(buf);
    while (*game == ' ') game++;
    p = buf;
    while (*game != ' ' && *game != '\n') *p++ = *game++;
    *p = NULLCHAR;
    gameInfo.black = StrSave(buf);

    /* Parse moves */
    boardIndex = blackPlaysFirst ? 1 : 0;
    yynewstr(game);
    for (;;) {
        yyboardindex = boardIndex;
        moveType = (ChessMove) Myylex();
        switch (moveType) {
          case IllegalMove:             /* maybe suicide chess, etc. */
  if (appData.debugMode) {
    fprintf(debugFP, "Illegal move from ICS: '%s'\n", yy_text);
    fprintf(debugFP, "board L=%d, R=%d, H=%d, holdings=%d\n", BOARD_LEFT, BOARD_RGHT, BOARD_HEIGHT, gameInfo.holdingsWidth);
    setbuf(debugFP, NULL);
  }
          case WhitePromotion:
          case BlackPromotion:
          case WhiteNonPromotion:
          case BlackNonPromotion:
          case NormalMove:
          case WhiteCapturesEnPassant:
          case BlackCapturesEnPassant:
          case WhiteKingSideCastle:
          case WhiteQueenSideCastle:
          case BlackKingSideCastle:
          case BlackQueenSideCastle:
          case WhiteKingSideCastleWild:
          case WhiteQueenSideCastleWild:
          case BlackKingSideCastleWild:
          case BlackQueenSideCastleWild:
          /* PUSH Fabien */
          case WhiteHSideCastleFR:
          case WhiteASideCastleFR:
          case BlackHSideCastleFR:
          case BlackASideCastleFR:
          /* POP Fabien */
            fromX = currentMoveString[0] - AAA;
            fromY = currentMoveString[1] - ONE;
            toX = currentMoveString[2] - AAA;
            toY = currentMoveString[3] - ONE;
            promoChar = currentMoveString[4];
            break;
          case WhiteDrop:
          case BlackDrop:
            if(currentMoveString[0] == '@') continue; // no null moves in ICS mode!
            fromX = moveType == WhiteDrop ?
              (int) CharToPiece(ToUpper(currentMoveString[0])) :
            (int) CharToPiece(ToLower(currentMoveString[0]));
            fromY = DROP_RANK;
            toX = currentMoveString[2] - AAA;
            toY = currentMoveString[3] - ONE;
            promoChar = NULLCHAR;
            break;
          case AmbiguousMove:
            /* bug? */
            snprintf(buf, MSG_SIZ, _("Ambiguous move in ICS output: \"%s\""), yy_text);
  if (appData.debugMode) {
    fprintf(debugFP, "Ambiguous move from ICS: '%s'\n", yy_text);
    fprintf(debugFP, "board L=%d, R=%d, H=%d, holdings=%d\n", BOARD_LEFT, BOARD_RGHT, BOARD_HEIGHT, gameInfo.holdingsWidth);
    setbuf(debugFP, NULL);
  }
            DisplayError(buf, 0);
            return;
          case ImpossibleMove:
            /* bug? */
            snprintf(buf, MSG_SIZ, _("Illegal move in ICS output: \"%s\""), yy_text);
  if (appData.debugMode) {
    fprintf(debugFP, "Impossible move from ICS: '%s'\n", yy_text);
    fprintf(debugFP, "board L=%d, R=%d, H=%d, holdings=%d\n", BOARD_LEFT, BOARD_RGHT, BOARD_HEIGHT, gameInfo.holdingsWidth);
    setbuf(debugFP, NULL);
  }
            DisplayError(buf, 0);
            return;
          case EndOfFile:
            if (boardIndex < backwardMostMove) {
                /* Oops, gap.  How did that happen? */
                DisplayError(_("Gap in move list"), 0);
                return;
            }
            backwardMostMove =  blackPlaysFirst ? 1 : 0;
            if (boardIndex > forwardMostMove) {
                forwardMostMove = boardIndex;
            }
            return;
          case ElapsedTime:
            if (boardIndex > (blackPlaysFirst ? 1 : 0)) {
                strcat(parseList[boardIndex-1], " ");
                strcat(parseList[boardIndex-1], yy_text);
            }
            continue;
          case Comment:
          case PGNTag:
          case NAG:
          default:
            /* ignore */
            continue;
          case WhiteWins:
          case BlackWins:
          case GameIsDrawn:
          case GameUnfinished:
            if (gameMode == IcsExamining) {
                if (boardIndex < backwardMostMove) {
                    /* Oops, gap.  How did that happen? */
                    return;
                }
                backwardMostMove = blackPlaysFirst ? 1 : 0;
                return;
            }
            gameInfo.result = moveType;
            p = strchr(yy_text, '{');
            if (p == NULL) p = strchr(yy_text, '(');
            if (p == NULL) {
                p = yy_text;
                if (p[0] == '0' || p[0] == '1' || p[0] == '*') p = "";
            } else {
                q = strchr(p, *p == '{' ? '}' : ')');
                if (q != NULL) *q = NULLCHAR;
                p++;
            }
            while(q = strchr(p, '\n')) *q = ' '; // [HGM] crush linefeeds in result message
            gameInfo.resultDetails = StrSave(p);
            continue;
        }
        if (boardIndex >= forwardMostMove &&
            !(gameMode == IcsObserving && ics_gamenum == -1)) {
            backwardMostMove = blackPlaysFirst ? 1 : 0;
            return;
        }
        (void) CoordsToAlgebraic(boards[boardIndex], PosFlags(boardIndex),
                                 fromY, fromX, toY, toX, promoChar,
                                 parseList[boardIndex]);
        CopyBoard(boards[boardIndex + 1], boards[boardIndex]);
        /* currentMoveString is set as a side-effect of yylex */
        safeStrCpy(moveList[boardIndex], currentMoveString, sizeof(moveList[boardIndex])/sizeof(moveList[boardIndex][0]));
        strcat(moveList[boardIndex], "\n");
        boardIndex++;
        ApplyMove(fromX, fromY, toX, toY, promoChar, boards[boardIndex]);
        switch (MateTest(boards[boardIndex], PosFlags(boardIndex)) ) {
          case MT_NONE:
          case MT_STALEMATE:
          default:
            break;
          case MT_CHECK:
            if(gameInfo.variant != VariantShogi)
                strcat(parseList[boardIndex - 1], "+");
            break;
          case MT_CHECKMATE:
          case MT_STAINMATE:
            strcat(parseList[boardIndex - 1], "#");
            break;
        }
    }
}


/* Apply a move to the given board  */
void
ApplyMove (int fromX, int fromY, int toX, int toY, int promoChar, Board board)
{
  ChessSquare captured = board[toY][toX], piece, king; int p, oldEP = EP_NONE, berolina = 0;
  int promoRank = gameInfo.variant == VariantMakruk || gameInfo.variant == VariantGrand ? 3 : 1;

    /* [HGM] compute & store e.p. status and castling rights for new position */
    /* we can always do that 'in place', now pointers to these rights are passed to ApplyMove */

      if(gameInfo.variant == VariantBerolina) berolina = EP_BEROLIN_A;
      oldEP = (signed char)board[EP_STATUS];
      board[EP_STATUS] = EP_NONE;

  if (fromY == DROP_RANK) {
        /* must be first */
        if(fromX == EmptySquare) { // [HGM] pass: empty drop encodes null move; nothing to change.
            board[EP_STATUS] = EP_CAPTURE; // null move considered irreversible
            return;
        }
        piece = board[toY][toX] = (ChessSquare) fromX;
  } else {
      int i;

      if( board[toY][toX] != EmptySquare )
           board[EP_STATUS] = EP_CAPTURE;

      if( board[fromY][fromX] == WhiteLance || board[fromY][fromX] == BlackLance ) {
           if( gameInfo.variant != VariantSuper && gameInfo.variant != VariantShogi )
               board[EP_STATUS] = EP_PAWN_MOVE; // Lance is Pawn-like in most variants
      } else
      if( board[fromY][fromX] == WhitePawn ) {
           if(fromY != toY) // [HGM] Xiangqi sideway Pawn moves should not count as 50-move breakers
               board[EP_STATUS] = EP_PAWN_MOVE;
           if( toY-fromY==2) {
               if(toX>BOARD_LEFT   && board[toY][toX-1] == BlackPawn &&
                        gameInfo.variant != VariantBerolina || toX < fromX)
                      board[EP_STATUS] = toX | berolina;
               if(toX<BOARD_RGHT-1 && board[toY][toX+1] == BlackPawn &&
                        gameInfo.variant != VariantBerolina || toX > fromX)
                      board[EP_STATUS] = toX;
           }
      } else
      if( board[fromY][fromX] == BlackPawn ) {
           if(fromY != toY) // [HGM] Xiangqi sideway Pawn moves should not count as 50-move breakers
               board[EP_STATUS] = EP_PAWN_MOVE;
           if( toY-fromY== -2) {
               if(toX>BOARD_LEFT   && board[toY][toX-1] == WhitePawn &&
                        gameInfo.variant != VariantBerolina || toX < fromX)
                      board[EP_STATUS] = toX | berolina;
               if(toX<BOARD_RGHT-1 && board[toY][toX+1] == WhitePawn &&
                        gameInfo.variant != VariantBerolina || toX > fromX)
                      board[EP_STATUS] = toX;
           }
       }

       for(i=0; i<nrCastlingRights; i++) {
           if(board[CASTLING][i] == fromX && castlingRank[i] == fromY ||
              board[CASTLING][i] == toX   && castlingRank[i] == toY
             ) board[CASTLING][i] = NoRights; // revoke for moved or captured piece
       }

     if (fromX == toX && fromY == toY) return;

     piece = board[fromY][fromX]; /* [HGM] remember, for Shogi promotion */
     king = piece < (int) BlackPawn ? WhiteKing : BlackKing; /* [HGM] Knightmate simplify testing for castling */
     if(gameInfo.variant == VariantKnightmate)
         king += (int) WhiteUnicorn - (int) WhiteKing;

    /* Code added by Tord: */
    /* FRC castling assumed when king captures friendly rook. [HGM] or RxK for S-Chess */
    if (board[fromY][fromX] == WhiteKing && board[toY][toX] == WhiteRook ||
        board[fromY][fromX] == WhiteRook && board[toY][toX] == WhiteKing) {
      board[fromY][fromX] = EmptySquare;
      board[toY][toX] = EmptySquare;
      if((toX > fromX) != (piece == WhiteRook)) {
        board[0][BOARD_RGHT-2] = WhiteKing; board[0][BOARD_RGHT-3] = WhiteRook;
      } else {
        board[0][BOARD_LEFT+2] = WhiteKing; board[0][BOARD_LEFT+3] = WhiteRook;
      }
    } else if (board[fromY][fromX] == BlackKing && board[toY][toX] == BlackRook ||
               board[fromY][fromX] == BlackRook && board[toY][toX] == BlackKing) {
      board[fromY][fromX] = EmptySquare;
      board[toY][toX] = EmptySquare;
      if((toX > fromX) != (piece == BlackRook)) {
        board[BOARD_HEIGHT-1][BOARD_RGHT-2] = BlackKing; board[BOARD_HEIGHT-1][BOARD_RGHT-3] = BlackRook;
      } else {
        board[BOARD_HEIGHT-1][BOARD_LEFT+2] = BlackKing; board[BOARD_HEIGHT-1][BOARD_LEFT+3] = BlackRook;
      }
    /* End of code added by Tord */

    } else if (board[fromY][fromX] == king
        && fromX != BOARD_LEFT && fromX != BOARD_RGHT-1 // [HGM] cylinder */
        && toY == fromY && toX > fromX+1) {
        board[fromY][fromX] = EmptySquare;
        board[toY][toX] = king;
        board[toY][toX-1] = board[fromY][BOARD_RGHT-1];
        board[fromY][BOARD_RGHT-1] = EmptySquare;
    } else if (board[fromY][fromX] == king
        && fromX != BOARD_LEFT && fromX != BOARD_RGHT-1 // [HGM] cylinder */
               && toY == fromY && toX < fromX-1) {
        board[fromY][fromX] = EmptySquare;
        board[toY][toX] = king;
        board[toY][toX+1] = board[fromY][BOARD_LEFT];
        board[fromY][BOARD_LEFT] = EmptySquare;
    } else if ((board[fromY][fromX] == WhitePawn && gameInfo.variant != VariantXiangqi ||
                board[fromY][fromX] == WhiteLance && gameInfo.variant != VariantSuper && gameInfo.variant != VariantShogi)
               && toY >= BOARD_HEIGHT-promoRank && promoChar // defaulting to Q is done elsewhere
               ) {
        /* white pawn promotion */
        board[toY][toX] = CharToPiece(ToUpper(promoChar));
        if(gameInfo.variant==VariantBughouse ||
           gameInfo.variant==VariantCrazyhouse) /* [HGM] use shadow piece */
            board[toY][toX] = (ChessSquare) (PROMOTED board[toY][toX]);
        board[fromY][fromX] = EmptySquare;
    } else if ((fromY >= BOARD_HEIGHT>>1)
               && (toX != fromX)
               && gameInfo.variant != VariantXiangqi
               && gameInfo.variant != VariantBerolina
               && (board[fromY][fromX] == WhitePawn)
               && (board[toY][toX] == EmptySquare)) {
        board[fromY][fromX] = EmptySquare;
        board[toY][toX] = WhitePawn;
        captured = board[toY - 1][toX];
        board[toY - 1][toX] = EmptySquare;
    } else if ((fromY == BOARD_HEIGHT-4)
               && (toX == fromX)
               && gameInfo.variant == VariantBerolina
               && (board[fromY][fromX] == WhitePawn)
               && (board[toY][toX] == EmptySquare)) {
        board[fromY][fromX] = EmptySquare;
        board[toY][toX] = WhitePawn;
        if(oldEP & EP_BEROLIN_A) {
                captured = board[fromY][fromX-1];
                board[fromY][fromX-1] = EmptySquare;
        }else{  captured = board[fromY][fromX+1];
                board[fromY][fromX+1] = EmptySquare;
        }
    } else if (board[fromY][fromX] == king
        && fromX != BOARD_LEFT && fromX != BOARD_RGHT-1 // [HGM] cylinder */
               && toY == fromY && toX > fromX+1) {
        board[fromY][fromX] = EmptySquare;
        board[toY][toX] = king;
        board[toY][toX-1] = board[fromY][BOARD_RGHT-1];
        board[fromY][BOARD_RGHT-1] = EmptySquare;
    } else if (board[fromY][fromX] == king
        && fromX != BOARD_LEFT && fromX != BOARD_RGHT-1 // [HGM] cylinder */
               && toY == fromY && toX < fromX-1) {
        board[fromY][fromX] = EmptySquare;
        board[toY][toX] = king;
        board[toY][toX+1] = board[fromY][BOARD_LEFT];
        board[fromY][BOARD_LEFT] = EmptySquare;
    } else if (fromY == 7 && fromX == 3
               && board[fromY][fromX] == BlackKing
               && toY == 7 && toX == 5) {
        board[fromY][fromX] = EmptySquare;
        board[toY][toX] = BlackKing;
        board[fromY][7] = EmptySquare;
        board[toY][4] = BlackRook;
    } else if (fromY == 7 && fromX == 3
               && board[fromY][fromX] == BlackKing
               && toY == 7 && toX == 1) {
        board[fromY][fromX] = EmptySquare;
        board[toY][toX] = BlackKing;
        board[fromY][0] = EmptySquare;
        board[toY][2] = BlackRook;
    } else if ((board[fromY][fromX] == BlackPawn && gameInfo.variant != VariantXiangqi ||
                board[fromY][fromX] == BlackLance && gameInfo.variant != VariantSuper && gameInfo.variant != VariantShogi)
               && toY < promoRank && promoChar
               ) {
        /* black pawn promotion */
        board[toY][toX] = CharToPiece(ToLower(promoChar));
        if(gameInfo.variant==VariantBughouse ||
           gameInfo.variant==VariantCrazyhouse) /* [HGM] use shadow piece */
            board[toY][toX] = (ChessSquare) (PROMOTED board[toY][toX]);
        board[fromY][fromX] = EmptySquare;
    } else if ((fromY < BOARD_HEIGHT>>1)
               && (toX != fromX)
               && gameInfo.variant != VariantXiangqi
               && gameInfo.variant != VariantBerolina
               && (board[fromY][fromX] == BlackPawn)
               && (board[toY][toX] == EmptySquare)) {
        board[fromY][fromX] = EmptySquare;
        board[toY][toX] = BlackPawn;
        captured = board[toY + 1][toX];
        board[toY + 1][toX] = EmptySquare;
    } else if ((fromY == 3)
               && (toX == fromX)
               && gameInfo.variant == VariantBerolina
               && (board[fromY][fromX] == BlackPawn)
               && (board[toY][toX] == EmptySquare)) {
        board[fromY][fromX] = EmptySquare;
        board[toY][toX] = BlackPawn;
        if(oldEP & EP_BEROLIN_A) {
                captured = board[fromY][fromX-1];
                board[fromY][fromX-1] = EmptySquare;
        }else{  captured = board[fromY][fromX+1];
                board[fromY][fromX+1] = EmptySquare;
        }
    } else {
        board[toY][toX] = board[fromY][fromX];
        board[fromY][fromX] = EmptySquare;
    }
  }

    if (gameInfo.holdingsWidth != 0) {

      /* !!A lot more code needs to be written to support holdings  */
      /* [HGM] OK, so I have written it. Holdings are stored in the */
      /* penultimate board files, so they are automaticlly stored   */
      /* in the game history.                                       */
      if (fromY == DROP_RANK || gameInfo.variant == VariantSChess
                                && promoChar && piece != WhitePawn && piece != BlackPawn) {
        /* Delete from holdings, by decreasing count */
        /* and erasing image if necessary            */
        p = fromY == DROP_RANK ? (int) fromX : CharToPiece(piece > BlackPawn ? ToLower(promoChar) : ToUpper(promoChar));
        if(p < (int) BlackPawn) { /* white drop */
             p -= (int)WhitePawn;
                 p = PieceToNumber((ChessSquare)p);
             if(p >= gameInfo.holdingsSize) p = 0;
             if(--board[p][BOARD_WIDTH-2] <= 0)
                  board[p][BOARD_WIDTH-1] = EmptySquare;
             if((int)board[p][BOARD_WIDTH-2] < 0)
                        board[p][BOARD_WIDTH-2] = 0;
        } else {                  /* black drop */
             p -= (int)BlackPawn;
                 p = PieceToNumber((ChessSquare)p);
             if(p >= gameInfo.holdingsSize) p = 0;
             if(--board[BOARD_HEIGHT-1-p][1] <= 0)
                  board[BOARD_HEIGHT-1-p][0] = EmptySquare;
             if((int)board[BOARD_HEIGHT-1-p][1] < 0)
                        board[BOARD_HEIGHT-1-p][1] = 0;
        }
      }
      if (captured != EmptySquare && gameInfo.holdingsSize > 0
          && gameInfo.variant != VariantBughouse && gameInfo.variant != VariantSChess        ) {
        /* [HGM] holdings: Add to holdings, if holdings exist */
        if(gameInfo.variant == VariantSuper || gameInfo.variant == VariantGreat || gameInfo.variant == VariantGrand) {
                // [HGM] superchess: suppress flipping color of captured pieces by reverse pre-flip
                captured = (int) captured >= (int) BlackPawn ? BLACK_TO_WHITE captured : WHITE_TO_BLACK captured;
        }
        p = (int) captured;
        if (p >= (int) BlackPawn) {
          p -= (int)BlackPawn;
          if(gameInfo.variant == VariantShogi && DEMOTED p >= 0) {
                  /* in Shogi restore piece to its original  first */
                  captured = (ChessSquare) (DEMOTED captured);
                  p = DEMOTED p;
          }
          p = PieceToNumber((ChessSquare)p);
          if(p >= gameInfo.holdingsSize) { p = 0; captured = BlackPawn; }
          board[p][BOARD_WIDTH-2]++;
          board[p][BOARD_WIDTH-1] = BLACK_TO_WHITE captured;
        } else {
          p -= (int)WhitePawn;
          if(gameInfo.variant == VariantShogi && DEMOTED p >= 0) {
                  captured = (ChessSquare) (DEMOTED captured);
                  p = DEMOTED p;
          }
          p = PieceToNumber((ChessSquare)p);
          if(p >= gameInfo.holdingsSize) { p = 0; captured = WhitePawn; }
          board[BOARD_HEIGHT-1-p][1]++;
          board[BOARD_HEIGHT-1-p][0] = WHITE_TO_BLACK captured;
        }
      }
    } else if (gameInfo.variant == VariantAtomic) {
      if (captured != EmptySquare) {
        int y, x;
        for (y = toY-1; y <= toY+1; y++) {
          for (x = toX-1; x <= toX+1; x++) {
            if (y >= 0 && y < BOARD_HEIGHT && x >= BOARD_LEFT && x < BOARD_RGHT &&
                board[y][x] != WhitePawn && board[y][x] != BlackPawn) {
              board[y][x] = EmptySquare;
            }
          }
        }
        board[toY][toX] = EmptySquare;
      }
    }
    if(gameInfo.variant == VariantSChess && promoChar != NULLCHAR && promoChar != '=' && piece != WhitePawn && piece != BlackPawn) {
        board[fromY][fromX] = CharToPiece(piece < BlackPawn ? ToUpper(promoChar) : ToLower(promoChar)); // S-Chess gating
    } else
    if(promoChar == '+') {
        /* [HGM] Shogi-style promotions, to piece implied by original (Might overwrite orinary Pawn promotion) */
        board[toY][toX] = (ChessSquare) (PROMOTED piece);
    } else if(!appData.testLegality && promoChar != NULLCHAR && promoChar != '=') { // without legality testing, unconditionally believe promoChar
        board[toY][toX] = CharToPiece(piece < BlackPawn ? ToUpper(promoChar) : ToLower(promoChar));
    }
    if((gameInfo.variant == VariantSuper || gameInfo.variant == VariantGreat || gameInfo.variant == VariantGrand)
                && promoChar != NULLCHAR && gameInfo.holdingsSize) {
        // [HGM] superchess: take promotion piece out of holdings
        int k = PieceToNumber(CharToPiece(ToUpper(promoChar)));
        if((int)piece < (int)BlackPawn) { // determine stm from piece color
            if(!--board[k][BOARD_WIDTH-2])
                board[k][BOARD_WIDTH-1] = EmptySquare;
        } else {
            if(!--board[BOARD_HEIGHT-1-k][1])
                board[BOARD_HEIGHT-1-k][0] = EmptySquare;
        }
    }

}

/* Updates forwardMostMove */
void
MakeMove (int fromX, int fromY, int toX, int toY, int promoChar)
{
//    forwardMostMove++; // [HGM] bare: moved downstream

    (void) CoordsToAlgebraic(boards[forwardMostMove],
                             PosFlags(forwardMostMove),
                             fromY, fromX, toY, toX, promoChar,
                             parseList[forwardMostMove]);

    if(serverMoves != NULL) { /* [HGM] write moves on file for broadcasting (should be separate routine, really) */
        int timeLeft; static int lastLoadFlag=0; int king, piece;
        piece = boards[forwardMostMove][fromY][fromX];
        king = piece < (int) BlackPawn ? WhiteKing : BlackKing;
        if(gameInfo.variant == VariantKnightmate)
            king += (int) WhiteUnicorn - (int) WhiteKing;
        if(forwardMostMove == 0) {
            if(gameMode == MachinePlaysBlack || gameMode == BeginningOfGame)
                fprintf(serverMoves, "%s;", UserName());
            else if(gameMode == TwoMachinesPlay && first.twoMachinesColor[0] == 'b')
                fprintf(serverMoves, "%s;", second.tidy);
            fprintf(serverMoves, "%s;", first.tidy);
            if(gameMode == MachinePlaysWhite)
                fprintf(serverMoves, "%s;", UserName());
            else if(gameMode == TwoMachinesPlay && first.twoMachinesColor[0] == 'w')
                fprintf(serverMoves, "%s;", second.tidy);
        } else fprintf(serverMoves, loadFlag|lastLoadFlag ? ":" : ";");
        lastLoadFlag = loadFlag;
        // print base move
        fprintf(serverMoves, "%c%c:%c%c", AAA+fromX, ONE+fromY, AAA+toX, ONE+toY);
        // print castling suffix
        if( toY == fromY && piece == king ) {
            if(toX-fromX > 1)
                fprintf(serverMoves, ":%c%c:%c%c", AAA+BOARD_RGHT-1, ONE+fromY, AAA+toX-1,ONE+toY);
            if(fromX-toX >1)
                fprintf(serverMoves, ":%c%c:%c%c", AAA+BOARD_LEFT, ONE+fromY, AAA+toX+1,ONE+toY);
        }
        // e.p. suffix
        if( (boards[forwardMostMove][fromY][fromX] == WhitePawn ||
             boards[forwardMostMove][fromY][fromX] == BlackPawn   ) &&
             boards[forwardMostMove][toY][toX] == EmptySquare
             && fromX != toX && fromY != toY)
                fprintf(serverMoves, ":%c%c:%c%c", AAA+fromX, ONE+fromY, AAA+toX, ONE+fromY);
        // promotion suffix
        if(promoChar != NULLCHAR)
                fprintf(serverMoves, ":%c:%c%c", ToLower(promoChar), AAA+toX, ONE+toY);
        if(!loadFlag) {
                char buf[MOVE_LEN*2], *p; int len;
            fprintf(serverMoves, "/%d/%d",
               pvInfoList[forwardMostMove].depth, pvInfoList[forwardMostMove].score);
            if(forwardMostMove+1 & 1) timeLeft = whiteTimeRemaining/1000;
            else                      timeLeft = blackTimeRemaining/1000;
            fprintf(serverMoves, "/%d", timeLeft);
                strncpy(buf, parseList[forwardMostMove], MOVE_LEN*2);
                if(p = strchr(buf, '=')) *p = NULLCHAR;
                len = strlen(buf); if(len > 1 && buf[len-2] != '-') buf[len-2] = NULLCHAR; // strip to-square
            fprintf(serverMoves, "/%s", buf);
        }
        fflush(serverMoves);
    }

    if (forwardMostMove+1 > framePtr) { // [HGM] vari: do not run into saved variations..
        GameEnds(GameUnfinished, _("Game too long; increase MAX_MOVES and recompile"), GE_XBOARD);
      return;
    }
    UnLoadPV(); // [HGM] pv: if we are looking at a PV, abort this
    if (commentList[forwardMostMove+1] != NULL) {
        free(commentList[forwardMostMove+1]);
        commentList[forwardMostMove+1] = NULL;
    }
    CopyBoard(boards[forwardMostMove+1], boards[forwardMostMove]);
    ApplyMove(fromX, fromY, toX, toY, promoChar, boards[forwardMostMove+1]);
    // forwardMostMove++; // [HGM] bare: moved to after ApplyMove, to make sure clock interrupt finds complete board
    SwitchClocks(forwardMostMove+1); // [HGM] race: incrementing move nr inside
    timeRemaining[0][forwardMostMove] = whiteTimeRemaining;
    timeRemaining[1][forwardMostMove] = blackTimeRemaining;
    adjustedClock = FALSE;
    gameInfo.result = GameUnfinished;
    if (gameInfo.resultDetails != NULL) {
        free(gameInfo.resultDetails);
        gameInfo.resultDetails = NULL;
    }
    CoordsToComputerAlgebraic(fromY, fromX, toY, toX, promoChar,
                              moveList[forwardMostMove - 1]);
    switch (MateTest(boards[forwardMostMove], PosFlags(forwardMostMove)) ) {
      case MT_NONE:
      case MT_STALEMATE:
      default:
        break;
      case MT_CHECK:
        if(gameInfo.variant != VariantShogi)
            strcat(parseList[forwardMostMove - 1], "+");
        break;
      case MT_CHECKMATE:
      case MT_STAINMATE:
        strcat(parseList[forwardMostMove - 1], "#");
        break;
    }

}

/* Updates currentMove if not pausing */
void
ShowMove (int fromX, int fromY, int toX, int toY)
{
    int instant = (gameMode == PlayFromGameFile) ?
        (matchMode || (appData.timeDelay == 0 && !pausing)) : pausing;
    if(appData.noGUI) return;
    if (!pausing || gameMode == PlayFromGameFile || gameMode == AnalyzeFile) {
        if (!instant) {
            if (forwardMostMove == currentMove + 1) {
                AnimateMove(boards[forwardMostMove - 1],
                            fromX, fromY, toX, toY);
            }
            if (appData.highlightLastMove) {
                SetHighlights(fromX, fromY, toX, toY);
            }
        }
        currentMove = forwardMostMove;
    }

    if (instant) return;

    DisplayMove(currentMove - 1);
    DrawPosition(FALSE, boards[currentMove]);
    DisplayBothClocks();
    HistorySet(parseList,backwardMostMove,forwardMostMove,currentMove-1);
}

void
SendEgtPath (ChessProgramState *cps)
{       /* [HGM] EGT: match formats given in feature with those given by user, and send info for each match */
        char buf[MSG_SIZ], name[MSG_SIZ], *p;

        if((p = cps->egtFormats) == NULL || appData.egtFormats == NULL) return;

        while(*p) {
            char c, *q = name+1, *r, *s;

            name[0] = ','; // extract next format name from feature and copy with prefixed ','
            while(*p && *p != ',') *q++ = *p++;
            *q++ = ':'; *q = 0;
            if( appData.defaultPathEGTB && appData.defaultPathEGTB[0] &&
                strcmp(name, ",nalimov:") == 0 ) {
                // take nalimov path from the menu-changeable option first, if it is defined
              snprintf(buf, MSG_SIZ, "egtpath nalimov %s\n", appData.defaultPathEGTB);
                SendToProgram(buf,cps);     // send egtbpath command for nalimov
            } else
            if( (s = StrStr(appData.egtFormats, name+1)) == appData.egtFormats ||
                (s = StrStr(appData.egtFormats, name)) != NULL) {
                // format name occurs amongst user-supplied formats, at beginning or immediately after comma
                s = r = StrStr(s, ":") + 1; // beginning of path info
                while(*r && *r != ',') r++; // path info is everything upto next ';' or end of string
                c = *r; *r = 0;             // temporarily null-terminate path info
                    *--q = 0;               // strip of trailig ':' from name
                    snprintf(buf, MSG_SIZ, "egtpath %s %s\n", name+1, s);
                *r = c;
                SendToProgram(buf,cps);     // send egtbpath command for this format
            }
            if(*p == ',') p++; // read away comma to position for next format name
        }
}

void
InitChessProgram (ChessProgramState *cps, int setup)
/* setup needed to setup FRC opening position */
{
    char buf[MSG_SIZ], b[MSG_SIZ]; int overruled;
    if (appData.noChessProgram) return;
    hintRequested = FALSE;
    bookRequested = FALSE;

    ParseFeatures(appData.features[cps == &second], cps); // [HGM] allow user to overrule features
    /* [HGM] some new WB protocol commands to configure engine are sent now, if engine supports them */
    /*       moved to before sending initstring in 4.3.15, so Polyglot can delay UCI 'isready' to recepton of 'new' */
    if(cps->memSize) { /* [HGM] memory */
      snprintf(buf, MSG_SIZ, "memory %d\n", appData.defaultHashSize + appData.defaultCacheSizeEGTB);
        SendToProgram(buf, cps);
    }
    SendEgtPath(cps); /* [HGM] EGT */
    if(cps->maxCores) { /* [HGM] SMP: (protocol specified must be last settings command before new!) */
      snprintf(buf, MSG_SIZ, "cores %d\n", appData.smpCores);
        SendToProgram(buf, cps);
    }

    SendToProgram(cps->initString, cps);
    if (gameInfo.variant != VariantNormal &&
        gameInfo.variant != VariantLoadable
        /* [HGM] also send variant if board size non-standard */
        || gameInfo.boardWidth != 8 || gameInfo.boardHeight != 8 || gameInfo.holdingsSize != 0
                                            ) {
      char *v = VariantName(gameInfo.variant);
      if (cps->protocolVersion != 1 && StrStr(cps->variants, v) == NULL) {
        /* [HGM] in protocol 1 we have to assume all variants valid */
        snprintf(buf, MSG_SIZ, _("Variant %s not supported by %s"), v, cps->tidy);
        DisplayFatalError(buf, 0, 1);
        return;
      }

      /* [HGM] make prefix for non-standard board size. Awkward testing... */
      overruled = gameInfo.boardWidth != 8 || gameInfo.boardHeight != 8 || gameInfo.holdingsSize != 0;
      if( gameInfo.variant == VariantXiangqi )
           overruled = gameInfo.boardWidth != 9 || gameInfo.boardHeight != 10 || gameInfo.holdingsSize != 0;
      if( gameInfo.variant == VariantShogi )
           overruled = gameInfo.boardWidth != 9 || gameInfo.boardHeight != 9 || gameInfo.holdingsSize != 7;
      if( gameInfo.variant == VariantBughouse || gameInfo.variant == VariantCrazyhouse )
           overruled = gameInfo.boardWidth != 8 || gameInfo.boardHeight != 8 || gameInfo.holdingsSize != 5;
      if( gameInfo.variant == VariantCapablanca || gameInfo.variant == VariantCapaRandom ||
          gameInfo.variant == VariantGothic || gameInfo.variant == VariantFalcon || gameInfo.variant == VariantJanus )
           overruled = gameInfo.boardWidth != 10 || gameInfo.boardHeight != 8 || gameInfo.holdingsSize != 0;
      if( gameInfo.variant == VariantCourier )
           overruled = gameInfo.boardWidth != 12 || gameInfo.boardHeight != 8 || gameInfo.holdingsSize != 0;
      if( gameInfo.variant == VariantSuper )
           overruled = gameInfo.boardWidth != 8 || gameInfo.boardHeight != 8 || gameInfo.holdingsSize != 8;
      if( gameInfo.variant == VariantGreat )
           overruled = gameInfo.boardWidth != 10 || gameInfo.boardHeight != 8 || gameInfo.holdingsSize != 8;
      if( gameInfo.variant == VariantSChess )
           overruled = gameInfo.boardWidth != 8 || gameInfo.boardHeight != 8 || gameInfo.holdingsSize != 7;
      if( gameInfo.variant == VariantGrand )
           overruled = gameInfo.boardWidth != 10 || gameInfo.boardHeight != 10 || gameInfo.holdingsSize != 7;

      if(overruled) {
        snprintf(b, MSG_SIZ, "%dx%d+%d_%s", gameInfo.boardWidth, gameInfo.boardHeight,
                 gameInfo.holdingsSize, VariantName(gameInfo.variant)); // cook up sized variant name
           /* [HGM] varsize: try first if this defiant size variant is specifically known */
           if(StrStr(cps->variants, b) == NULL) {
               // specific sized variant not known, check if general sizing allowed
               if (cps->protocolVersion != 1) { // for protocol 1 we cannot check and hope for the best
                   if(StrStr(cps->variants, "boardsize") == NULL) {
                     snprintf(buf, MSG_SIZ, "Board size %dx%d+%d not supported by %s",
                            gameInfo.boardWidth, gameInfo.boardHeight, gameInfo.holdingsSize, cps->tidy);
                       DisplayFatalError(buf, 0, 1);
                       return;
                   }
                   /* [HGM] here we really should compare with the maximum supported board size */
               }
           }
      } else snprintf(b, MSG_SIZ,"%s", VariantName(gameInfo.variant));
      snprintf(buf, MSG_SIZ, "variant %s\n", b);
      SendToProgram(buf, cps);
    }
    currentlyInitializedVariant = gameInfo.variant;

    /* [HGM] send opening position in FRC to first engine */
    if(setup) {
          SendToProgram("force\n", cps);
          SendBoard(cps, 0);
          /* engine is now in force mode! Set flag to wake it up after first move. */
          setboardSpoiledMachineBlack = 1;
    }

    if (cps->sendICS) {
      snprintf(buf, sizeof(buf), "ics %s\n", appData.icsActive ? appData.icsHost : "-");
      SendToProgram(buf, cps);
    }
    cps->maybeThinking = FALSE;
    cps->offeredDraw = 0;
    if (!appData.icsActive) {
        SendTimeControl(cps, movesPerSession, timeControl,
                        timeIncrement, appData.searchDepth,
                        searchTime);
    }
    if (appData.showThinking
        // [HGM] thinking: four options require thinking output to be sent
        || !appData.hideThinkingFromHuman || appData.adjudicateLossThreshold != 0 || EngineOutputIsUp()
                                ) {
        SendToProgram("post\n", cps);
    }
    SendToProgram("hard\n", cps);
    if (!appData.ponderNextMove) {
        /* Warning: "easy" is a toggle in GNU Chess, so don't send
           it without being sure what state we are in first.  "hard"
           is not a toggle, so that one is OK.
         */
        SendToProgram("easy\n", cps);
    }
    if (cps->usePing) {
      snprintf(buf, MSG_SIZ, "ping %d\n", ++cps->lastPing);
      SendToProgram(buf, cps);
    }
    cps->initDone = TRUE;
    ClearEngineOutputPane(cps == &second);
}


void
StartChessProgram (ChessProgramState *cps)
{
    char buf[MSG_SIZ];
    int err;

    if (appData.noChessProgram) return;
    cps->initDone = FALSE;

    if (strcmp(cps->host, "localhost") == 0) {
        err = StartChildProcess(cps->program, cps->dir, &cps->pr);
    } else if (*appData.remoteShell == NULLCHAR) {
        err = OpenRcmd(cps->host, appData.remoteUser, cps->program, &cps->pr);
    } else {
        if (*appData.remoteUser == NULLCHAR) {
          snprintf(buf, sizeof(buf), "%s %s %s", appData.remoteShell, cps->host,
                    cps->program);
        } else {
          snprintf(buf, sizeof(buf), "%s %s -l %s %s", appData.remoteShell,
                    cps->host, appData.remoteUser, cps->program);
        }
        err = StartChildProcess(buf, "", &cps->pr);
    }

    if (err != 0) {
      snprintf(buf, MSG_SIZ, _("Startup failure on '%s'"), cps->program);
        DisplayError(buf, err); // [HGM] bit of a rough kludge: ignore failure, (which XBoard would do anyway), and let I/O discover it
        if(cps != &first) return;
        appData.noChessProgram = TRUE;
        ThawUI();
        SetNCPMode();
//      DisplayFatalError(buf, err, 1);
//      cps->pr = NoProc;
//      cps->isr = NULL;
        return;
    }

    cps->isr = AddInputSource(cps->pr, TRUE, ReceiveFromProgram, cps);
    if (cps->protocolVersion > 1) {
      snprintf(buf, MSG_SIZ, "xboard\nprotover %d\n", cps->protocolVersion);
      cps->nrOptions = 0; // [HGM] options: clear all engine-specific options
      cps->comboCnt = 0;  //                and values of combo boxes
      SendToProgram(buf, cps);
    } else {
      SendToProgram("xboard\n", cps);
    }
}

void
TwoMachinesEventIfReady P((void))
{
  static int curMess = 0;
  if (first.lastPing != first.lastPong) {
    if(curMess != 1) DisplayMessage("", _("Waiting for first chess program")); curMess = 1;
    ScheduleDelayedEvent(TwoMachinesEventIfReady, 10); // [HGM] fast: lowered from 1000
    return;
  }
  if (second.lastPing != second.lastPong) {
    if(curMess != 2) DisplayMessage("", _("Waiting for second chess program")); curMess = 2;
    ScheduleDelayedEvent(TwoMachinesEventIfReady, 10); // [HGM] fast: lowered from 1000
    return;
  }
  DisplayMessage("", ""); curMess = 0;
  ThawUI();
  TwoMachinesEvent();
}

char *
MakeName (char *template)
{
    time_t clock;
    struct tm *tm;
    static char buf[MSG_SIZ];
    char *p = buf;
    int i;

    clock = time((time_t *)NULL);
    tm = localtime(&clock);

    while(*p++ = *template++) if(p[-1] == '%') {
        switch(*template++) {
          case 0:   *p = 0; return buf;
          case 'Y': i = tm->tm_year+1900; break;
          case 'y': i = tm->tm_year-100; break;
          case 'M': i = tm->tm_mon+1; break;
          case 'd': i = tm->tm_mday; break;
          case 'h': i = tm->tm_hour; break;
          case 'm': i = tm->tm_min; break;
          case 's': i = tm->tm_sec; break;
          default:  i = 0;
        }
        snprintf(p-1, MSG_SIZ-10 - (p - buf), "%02d", i); p += strlen(p);
    }
    return buf;
}

int
CountPlayers (char *p)
{
    int n = 0;
    while(p = strchr(p, '\n')) p++, n++; // count participants
    return n;
}

FILE *
WriteTourneyFile (char *results, FILE *f)
{   // write tournament parameters on tourneyFile; on success return the stream pointer for closing
    if(f == NULL) f = fopen(appData.tourneyFile, "w");
    if(f == NULL) DisplayError(_("Could not write on tourney file"), 0); else {
        // create a file with tournament description
        fprintf(f, "-participants {%s}\n", appData.participants);
        fprintf(f, "-seedBase %d\n", appData.seedBase);
        fprintf(f, "-tourneyType %d\n", appData.tourneyType);
        fprintf(f, "-tourneyCycles %d\n", appData.tourneyCycles);
        fprintf(f, "-defaultMatchGames %d\n", appData.defaultMatchGames);
        fprintf(f, "-syncAfterRound %s\n", appData.roundSync ? "true" : "false");
        fprintf(f, "-syncAfterCycle %s\n", appData.cycleSync ? "true" : "false");
        fprintf(f, "-saveGameFile \"%s\"\n", appData.saveGameFile);
        fprintf(f, "-loadGameFile \"%s\"\n", appData.loadGameFile);
        fprintf(f, "-loadGameIndex %d\n", appData.loadGameIndex);
        fprintf(f, "-loadPositionFile \"%s\"\n", appData.loadPositionFile);
        fprintf(f, "-loadPositionIndex %d\n", appData.loadPositionIndex);
        fprintf(f, "-rewindIndex %d\n", appData.rewindIndex);
        fprintf(f, "-discourageOwnBooks %s\n", appData.defNoBook ? "true" : "false");
        if(searchTime > 0)
                fprintf(f, "-searchTime \"%d:%02d\"\n", searchTime/60, searchTime%60);
        else {
                fprintf(f, "-mps %d\n", appData.movesPerSession);
                fprintf(f, "-tc %s\n", appData.timeControl);
                fprintf(f, "-inc %.2f\n", appData.timeIncrement);
        }
        fprintf(f, "-results \"%s\"\n", results);
    }
    return f;
}

char *command[MAXENGINES], *mnemonic[MAXENGINES];

void
Substitute (char *participants, int expunge)
{
    int i, changed, changes=0, nPlayers=0;
    char *p, *q, *r, buf[MSG_SIZ];
    if(participants == NULL) return;
    if(appData.tourneyFile[0] == NULLCHAR) { free(participants); return; }
    r = p = participants; q = appData.participants;
    while(*p && *p == *q) {
        if(*p == '\n') r = p+1, nPlayers++;
        p++; q++;
    }
    if(*p) { // difference
        while(*p && *p++ != '\n');
        while(*q && *q++ != '\n');
      changed = nPlayers;
        changes = 1 + (strcmp(p, q) != 0);
    }
    if(changes == 1) { // a single engine mnemonic was changed
        q = r; while(*q) nPlayers += (*q++ == '\n');
        p = buf; while(*r && (*p = *r++) != '\n') p++;
        *p = NULLCHAR;
        NamesToList(firstChessProgramNames, command, mnemonic, "all");
        for(i=1; mnemonic[i]; i++) if(!strcmp(buf, mnemonic[i])) break;
        if(mnemonic[i]) { // The substitute is valid
            FILE *f;
            if(appData.tourneyFile[0] && (f = fopen(appData.tourneyFile, "r+")) ) {
                flock(fileno(f), LOCK_EX);
                ParseArgsFromFile(f);
                fseek(f, 0, SEEK_SET);
                FREE(appData.participants); appData.participants = participants;
                if(expunge) { // erase results of replaced engine
                    int len = strlen(appData.results), w, b, dummy;
                    for(i=0; i<len; i++) {
                        Pairing(i, nPlayers, &w, &b, &dummy);
                        if((w == changed || b == changed) && appData.results[i] == '*') {
                            DisplayError(_("You cannot replace an engine while it is engaged!\nTerminate its game first."), 0);
                            fclose(f);
                            return;
                        }
                    }
                    for(i=0; i<len; i++) {
                        Pairing(i, nPlayers, &w, &b, &dummy);
                        if(w == changed || b == changed) appData.results[i] = ' '; // mark as not played
                    }
                }
                WriteTourneyFile(appData.results, f);
                fclose(f); // release lock
                return;
            }
        } else DisplayError(_("No engine with the name you gave is installed"), 0);
    }
    if(changes == 0) DisplayError(_("First change an engine by editing the participants list\nof the Tournament Options dialog"), 0);
    if(changes > 1)  DisplayError(_("You can only change one engine at the time"), 0);
    free(participants);
    return;
}

int
CreateTourney (char *name)
{
        FILE *f;
        if(matchMode && strcmp(name, appData.tourneyFile)) {
             ASSIGN(name, appData.tourneyFile); //do not allow change of tourneyfile while playing
        }
        if(name[0] == NULLCHAR) {
            if(appData.participants[0])
                DisplayError(_("You must supply a tournament file,\nfor storing the tourney progress"), 0);
            return 0;
        }
        f = fopen(name, "r");
        if(f) { // file exists
            ASSIGN(appData.tourneyFile, name);
            ParseArgsFromFile(f); // parse it
        } else {
            if(!appData.participants[0]) return 0; // ignore tourney file if non-existing & no participants
            if(CountPlayers(appData.participants) < (appData.tourneyType>0 ? appData.tourneyType+1 : 2)) {
                DisplayError(_("Not enough participants"), 0);
                return 0;
            }
            ASSIGN(appData.tourneyFile, name);
            if(appData.tourneyType < 0) appData.defaultMatchGames = 1; // Swiss forces games/pairing = 1
            if((f = WriteTourneyFile("", NULL)) == NULL) return 0;
        }
        fclose(f);
        appData.noChessProgram = FALSE;
        appData.clockMode = TRUE;
        SetGNUMode();
        return 1;
}

int
NamesToList (char *names, char **engineList, char **engineMnemonic, char *group)
{
    char buf[MSG_SIZ], *p, *q;
    int i=1, header, skip, all = !strcmp(group, "all"), depth = 0;
    skip = !all && group[0]; // if group requested, we start in skip mode
    for(;*names && depth >= 0 && i < MAXENGINES-1; names = p) {
        p = names; q = buf; header = 0;
        while(*p && *p != '\n') *q++ = *p++;
        *q = 0;
        if(*p == '\n') p++;
        if(buf[0] == '#') {
            if(strstr(buf, "# end") == buf) { depth--; continue; } // leave group, and suppress printing label
            depth++; // we must be entering a new group
            if(all) continue; // suppress printing group headers when complete list requested
            header = 1;
            if(skip && !strcmp(group, buf)) { depth = 0; skip = FALSE; } // start when we reach requested group
        }
        if(depth != header && !all || skip) continue; // skip contents of group (but print first-level header)
        if(engineList[i]) free(engineList[i]);
        engineList[i] = strdup(buf);
        if(buf[0] != '#') TidyProgramName(engineList[i], "localhost", buf); // group headers not tidied
        if(engineMnemonic[i]) free(engineMnemonic[i]);
        if((q = strstr(engineList[i]+2, "variant")) && q[-2]== ' ' && (q[-1]=='/' || q[-1]=='-') && (q[7]==' ' || q[7]=='=')) {
            strcat(buf, " (");
            sscanf(q + 8, "%s", buf + strlen(buf));
            strcat(buf, ")");
        }
        engineMnemonic[i] = strdup(buf);
        i++;
    }
    engineList[i] = engineMnemonic[i] = NULL;
    return i;
}

// following implemented as macro to avoid type limitations
#define SWAP(item, temp) temp = appData.item[0]; appData.item[0] = appData.item[n]; appData.item[n] = temp;

void
SwapEngines (int n)
{   // swap settings for first engine and other engine (so far only some selected options)
    int h;
    char *p;
    if(n == 0) return;
    SWAP(directory, p)
    SWAP(chessProgram, p)
    SWAP(isUCI, h)
    SWAP(hasOwnBookUCI, h)
    SWAP(protocolVersion, h)
    SWAP(reuse, h)
    SWAP(scoreIsAbsolute, h)
    SWAP(timeOdds, h)
    SWAP(logo, p)
    SWAP(pgnName, p)
    SWAP(pvSAN, h)
    SWAP(engOptions, p)
}

int
SetPlayer (int player, char *p)
{   // [HGM] find the engine line of the partcipant given by number, and parse its options.
    int i;
    char buf[MSG_SIZ], *engineName;
    for(i=0; i<player; i++) p = strchr(p, '\n') + 1;
    engineName = strdup(p); if(p = strchr(engineName, '\n')) *p = NULLCHAR;
    for(i=1; command[i]; i++) if(!strcmp(mnemonic[i], engineName)) break;
    if(mnemonic[i]) {
        snprintf(buf, MSG_SIZ, "-fcp %s", command[i]);
        ParseArgsFromString(resetOptions); appData.fenOverride[0] = NULL; appData.pvSAN[0] = FALSE;
        appData.firstHasOwnBookUCI = !appData.defNoBook; appData.protocolVersion[0] = PROTOVER;
        ParseArgsFromString(buf);
    }
    free(engineName);
    return i;
}

char *recentEngines;

void
RecentEngineEvent (int nr)
{
    int n;
//    SwapEngines(1); // bump first to second
//    ReplaceEngine(&second, 1); // and load it there
    NamesToList(firstChessProgramNames, command, mnemonic, "all"); // get mnemonics of installed engines
    n = SetPlayer(nr, recentEngines); // select new (using original menu order!)
    if(mnemonic[n]) { // if somehow the engine with the selected nickname is no longer found in the list, we skip
        ReplaceEngine(&first, 0);
        FloatToFront(&appData.recentEngineList, command[n]);
    }
}

int
Pairing (int nr, int nPlayers, int *whitePlayer, int *blackPlayer, int *syncInterval)
{   // determine players from game number
    int curCycle, curRound, curPairing, gamesPerCycle, gamesPerRound, roundsPerCycle=1, pairingsPerRound=1;

    if(appData.tourneyType == 0) {
        roundsPerCycle = (nPlayers - 1) | 1;
        pairingsPerRound = nPlayers / 2;
    } else if(appData.tourneyType > 0) {
        roundsPerCycle = nPlayers - appData.tourneyType;
        pairingsPerRound = appData.tourneyType;
    }
    gamesPerRound = pairingsPerRound * appData.defaultMatchGames;
    gamesPerCycle = gamesPerRound * roundsPerCycle;
    appData.matchGames = gamesPerCycle * appData.tourneyCycles - 1; // fake like all games are one big match
    curCycle = nr / gamesPerCycle; nr %= gamesPerCycle;
    curRound = nr / gamesPerRound; nr %= gamesPerRound;
    curPairing = nr / appData.defaultMatchGames; nr %= appData.defaultMatchGames;
    matchGame = nr + curCycle * appData.defaultMatchGames + 1; // fake game nr that loads correct game or position from file
    roundNr = (curCycle * roundsPerCycle + curRound) * appData.defaultMatchGames + nr + 1;

    if(appData.cycleSync) *syncInterval = gamesPerCycle;
    if(appData.roundSync) *syncInterval = gamesPerRound;

    if(appData.debugMode) fprintf(debugFP, "cycle=%d, round=%d, pairing=%d curGame=%d\n", curCycle, curRound, curPairing, matchGame);

    if(appData.tourneyType == 0) {
        if(curPairing == (nPlayers-1)/2 ) {
            *whitePlayer = curRound;
            *blackPlayer = nPlayers - 1; // this is the 'bye' when nPlayer is odd
        } else {
            *whitePlayer = curRound - (nPlayers-1)/2 + curPairing;
            if(*whitePlayer < 0) *whitePlayer += nPlayers-1+(nPlayers&1);
            *blackPlayer = curRound + (nPlayers-1)/2 - curPairing;
            if(*blackPlayer >= nPlayers-1+(nPlayers&1)) *blackPlayer -= nPlayers-1+(nPlayers&1);
        }
    } else if(appData.tourneyType > 1) {
        *blackPlayer = curPairing; // in multi-gauntlet, assign gauntlet engines to second, so first an be kept loaded during round
        *whitePlayer = curRound + appData.tourneyType;
    } else if(appData.tourneyType > 0) {
        *whitePlayer = curPairing;
        *blackPlayer = curRound + appData.tourneyType;
    }

    // take care of white/black alternation per round. 
    // For cycles and games this is already taken care of by default, derived from matchGame!
    return curRound & 1;
}

int
NextTourneyGame (int nr, int *swapColors)
{   // !!!major kludge!!! fiddle appData settings to get everything in order for next tourney game
    char *p, *q;
    int whitePlayer, blackPlayer, firstBusy=1000000000, syncInterval = 0, nPlayers;
    FILE *tf;
    if(appData.tourneyFile[0] == NULLCHAR) return 1; // no tourney, always allow next game
    tf = fopen(appData.tourneyFile, "r");
    if(tf == NULL) { DisplayFatalError(_("Bad tournament file"), 0, 1); return 0; }
    ParseArgsFromFile(tf); fclose(tf);
    InitTimeControls(); // TC might be altered from tourney file

    nPlayers = CountPlayers(appData.participants); // count participants
    if(appData.tourneyType < 0) syncInterval = nPlayers/2; else
    *swapColors = Pairing(nr<0 ? 0 : nr, nPlayers, &whitePlayer, &blackPlayer, &syncInterval);

    if(syncInterval) {
        p = q = appData.results;
        while(*q) if(*q++ == '*' || q[-1] == ' ') { firstBusy = q - p - 1; break; }
        if(firstBusy/syncInterval < (nextGame/syncInterval)) {
            DisplayMessage(_("Waiting for other game(s)"),"");
            waitingForGame = TRUE;
            ScheduleDelayedEvent(NextMatchGame, 1000); // wait for all games of previous round to finish
            return 0;
        }
        waitingForGame = FALSE;
    }

    if(appData.tourneyType < 0) {
        if(nr>=0 && !pairingReceived) {
            char buf[1<<16];
            if(pairing.pr == NoProc) {
                if(!appData.pairingEngine[0]) {
                    DisplayFatalError(_("No pairing engine specified"), 0, 1);
                    return 0;
                }
                StartChessProgram(&pairing); // starts the pairing engine
            }
            snprintf(buf, 1<<16, "results %d %s\n", nPlayers, appData.results);
            SendToProgram(buf, &pairing);
            snprintf(buf, 1<<16, "pairing %d\n", nr+1);
            SendToProgram(buf, &pairing);
            return 0; // wait for pairing engine to answer (which causes NextTourneyGame to be called again...
        }
        pairingReceived = 0;                              // ... so we continue here 
        *swapColors = 0;
        appData.matchGames = appData.tourneyCycles * syncInterval - 1;
        whitePlayer = savedWhitePlayer-1; blackPlayer = savedBlackPlayer-1;
        matchGame = 1; roundNr = nr / syncInterval + 1;
    }

    if(first.pr != NoProc && second.pr != NoProc || nr<0) return 1; // engines already loaded

    // redefine engines, engine dir, etc.
    NamesToList(firstChessProgramNames, command, mnemonic, "all"); // get mnemonics of installed engines
    if(first.pr == NoProc) {
      SetPlayer(whitePlayer, appData.participants); // find white player amongst it, and parse its engine line
      InitEngine(&first, 0);  // initialize ChessProgramStates based on new settings.
    }
    if(second.pr == NoProc) {
      SwapEngines(1);
      SetPlayer(blackPlayer, appData.participants); // find black player amongst it, and parse its engine line
      SwapEngines(1);         // and make that valid for second engine by swapping
      InitEngine(&second, 1);
    }
    CommonEngineInit();     // after this TwoMachinesEvent will create correct engine processes
    UpdateLogos(FALSE);     // leave display to ModeHiglight()
    return 1;
}

void
NextMatchGame ()
{   // performs game initialization that does not invoke engines, and then tries to start the game
    int res, firstWhite, swapColors = 0;
    if(!NextTourneyGame(nextGame, &swapColors)) return; // this sets matchGame, -fcp / -scp and other options for next game, if needed
    if(matchMode && appData.debugMode) { // [HGM] debug split: game is part of a match; we might have to create a debug file just for this game
        char buf[MSG_SIZ];
        snprintf(buf, MSG_SIZ, appData.nameOfDebugFile, nextGame+1); // expand name of debug file with %d in it
        if(strcmp(buf, currentDebugFile)) { // name has changed
            FILE *f = fopen(buf, "w");
            if(f) { // if opening the new file failed, just keep using the old one
                ASSIGN(currentDebugFile, buf);
                fclose(debugFP);
                debugFP = f;
            }
        }
    }
    firstWhite = appData.firstPlaysBlack ^ (matchGame & 1 | appData.sameColorGames > 1); // non-incremental default
    firstWhite ^= swapColors; // reverses if NextTourneyGame says we are in an odd round
    first.twoMachinesColor =  firstWhite ? "white\n" : "black\n";   // perform actual color assignement
    second.twoMachinesColor = firstWhite ? "black\n" : "white\n";
    appData.noChessProgram = (first.pr == NoProc); // kludge to prevent Reset from starting up chess program
    if(appData.loadGameIndex == -2) srandom(appData.seedBase + 68163*(nextGame & ~1)); // deterministic seed to force same opening
    Reset(FALSE, first.pr != NoProc);
    res = LoadGameOrPosition(matchGame); // setup game
    appData.noChessProgram = FALSE; // LoadGameOrPosition might call Reset too!
    if(!res) return; // abort when bad game/pos file
    TwoMachinesEvent();
}

void
UserAdjudicationEvent (int result)
{
    ChessMove gameResult = GameIsDrawn;

    if( result > 0 ) {
        gameResult = WhiteWins;
    }
    else if( result < 0 ) {
        gameResult = BlackWins;
    }

    if( gameMode == TwoMachinesPlay ) {
        GameEnds( gameResult, "User adjudication", GE_XBOARD );
    }
}


// [HGM] save: calculate checksum of game to make games easily identifiable
int
StringCheckSum (char *s)
{
        int i = 0;
        if(s==NULL) return 0;
        while(*s) i = i*259 + *s++;
        return i;
}

int
GameCheckSum ()
{
        int i, sum=0;
        for(i=backwardMostMove; i<forwardMostMove; i++) {
                sum += pvInfoList[i].depth;
                sum += StringCheckSum(parseList[i]);
                sum += StringCheckSum(commentList[i]);
                sum *= 261;
        }
        if(i>1 && sum==0) sum++; // make sure never zero for non-empty game
        return sum + StringCheckSum(commentList[i]);
} // end of save patch

void
GameEnds (ChessMove result, char *resultDetails, int whosays)
{
    GameMode nextGameMode;
    int isIcsGame;
    char buf[MSG_SIZ], popupRequested = 0, *ranking = NULL;

    if(endingGame) return; /* [HGM] crash: forbid recursion */
    endingGame = 1;
    if(twoBoards) { // [HGM] dual: switch back to one board
        twoBoards = partnerUp = 0; InitDrawingSizes(-2, 0);
        DrawPosition(TRUE, partnerBoard); // observed game becomes foreground
    }
    if (appData.debugMode) {
      fprintf(debugFP, "GameEnds(%d, %s, %d)\n",
              result, resultDetails ? resultDetails : "(null)", whosays);
    }

    fromX = fromY = -1; // [HGM] abort any move the user is entering.

    if (appData.icsActive && (whosays == GE_ENGINE || whosays >= GE_ENGINE1)) {
        /* If we are playing on ICS, the server decides when the
           game is over, but the engine can offer to draw, claim
           a draw, or resign.
         */
#if ZIPPY
        if (appData.zippyPlay && first.initDone) {
            if (result == GameIsDrawn) {
                /* In case draw still needs to be claimed */
                SendToICS(ics_prefix);
                SendToICS("draw\n");
            } else if (StrCaseStr(resultDetails, "resign")) {
                SendToICS(ics_prefix);
                SendToICS("resign\n");
            }
        }
#endif
        endingGame = 0; /* [HGM] crash */
        return;
    }

    /* If we're loading the game from a file, stop */
    if (whosays == GE_FILE) {
      (void) StopLoadGameTimer();
      gameFileFP = NULL;
    }

    /* Cancel draw offers */
    first.offeredDraw = second.offeredDraw = 0;

    /* If this is an ICS game, only ICS can really say it's done;
       if not, anyone can. */
    isIcsGame = (gameMode == IcsPlayingWhite ||
                 gameMode == IcsPlayingBlack ||
                 gameMode == IcsObserving    ||
                 gameMode == IcsExamining);

    if (!isIcsGame || whosays == GE_ICS) {
        /* OK -- not an ICS game, or ICS said it was done */
        StopClocks();
        if (!isIcsGame && !appData.noChessProgram)
          SetUserThinkingEnables();

        /* [HGM] if a machine claims the game end we verify this claim */
        if(gameMode == TwoMachinesPlay && appData.testClaims) {
            if(appData.testLegality && whosays >= GE_ENGINE1 ) {
                char claimer;
                ChessMove trueResult = (ChessMove) -1;

                claimer = whosays == GE_ENGINE1 ?      /* color of claimer */
                                            first.twoMachinesColor[0] :
                                            second.twoMachinesColor[0] ;

                // [HGM] losers: because the logic is becoming a bit hairy, determine true result first
                if((signed char)boards[forwardMostMove][EP_STATUS] == EP_CHECKMATE) {
                    /* [HGM] verify: engine mate claims accepted if they were flagged */
                    trueResult = WhiteOnMove(forwardMostMove) ? BlackWins : WhiteWins;
                } else
                if((signed char)boards[forwardMostMove][EP_STATUS] == EP_WINS) { // added code for games where being mated is a win
                    /* [HGM] verify: engine mate claims accepted if they were flagged */
                    trueResult = WhiteOnMove(forwardMostMove) ? WhiteWins : BlackWins;
                } else
                if((signed char)boards[forwardMostMove][EP_STATUS] == EP_STALEMATE) { // only used to indicate draws now
                    trueResult = GameIsDrawn; // default; in variants where stalemate loses, Status is CHECKMATE
                }

                // now verify win claims, but not in drop games, as we don't understand those yet
                if( (gameInfo.holdingsWidth == 0 || gameInfo.variant == VariantSuper
                                                 || gameInfo.variant == VariantGreat || gameInfo.variant == VariantGrand) &&
                    (result == WhiteWins && claimer == 'w' ||
                     result == BlackWins && claimer == 'b'   ) ) { // case to verify: engine claims own win
                      if (appData.debugMode) {
                        fprintf(debugFP, "result=%d sp=%d move=%d\n",
                                result, (signed char)boards[forwardMostMove][EP_STATUS], forwardMostMove);
                      }
                      if(result != trueResult) {
                        snprintf(buf, MSG_SIZ, "False win claim: '%s'", resultDetails);
                              result = claimer == 'w' ? BlackWins : WhiteWins;
                              resultDetails = buf;
                      }
                } else
                if( result == GameIsDrawn && (signed char)boards[forwardMostMove][EP_STATUS] > EP_DRAWS
                    && (forwardMostMove <= backwardMostMove ||
                        (signed char)boards[forwardMostMove-1][EP_STATUS] > EP_DRAWS ||
                        (claimer=='b')==(forwardMostMove&1))
                                                                                  ) {
                      /* [HGM] verify: draws that were not flagged are false claims */
                  snprintf(buf, MSG_SIZ, "False draw claim: '%s'", resultDetails);
                      result = claimer == 'w' ? BlackWins : WhiteWins;
                      resultDetails = buf;
                }
                /* (Claiming a loss is accepted no questions asked!) */
            }
            /* [HGM] bare: don't allow bare King to win */
            if((gameInfo.holdingsWidth == 0 || gameInfo.variant == VariantSuper
                                            || gameInfo.variant == VariantGreat || gameInfo.variant == VariantGrand)
               && gameInfo.variant != VariantLosers && gameInfo.variant != VariantGiveaway
               && gameInfo.variant != VariantSuicide // [HGM] losers: except in losers, of course...
               && result != GameIsDrawn)
            {   int i, j, k=0, color = (result==WhiteWins ? (int)WhitePawn : (int)BlackPawn);
                for(j=BOARD_LEFT; j<BOARD_RGHT; j++) for(i=0; i<BOARD_HEIGHT; i++) {
                        int p = (signed char)boards[forwardMostMove][i][j] - color;
                        if(p >= 0 && p <= (int)WhiteKing) k++;
                }
                if (appData.debugMode) {
                     fprintf(debugFP, "GE(%d, %s, %d) bare king k=%d color=%d\n",
                        result, resultDetails ? resultDetails : "(null)", whosays, k, color);
                }
                if(k <= 1) {
                        result = GameIsDrawn;
                        snprintf(buf, MSG_SIZ, "%s but bare king", resultDetails);
                        resultDetails = buf;
                }
            }
        }


        if(serverMoves != NULL && !loadFlag) { char c = '=';
            if(result==WhiteWins) c = '+';
            if(result==BlackWins) c = '-';
            if(resultDetails != NULL)
                fprintf(serverMoves, ";%c;%s\n", c, resultDetails), fflush(serverMoves);
        }
        if (resultDetails != NULL) {
            gameInfo.result = result;
            gameInfo.resultDetails = StrSave(resultDetails);

            /* display last move only if game was not loaded from file */
            if ((whosays != GE_FILE) && (currentMove == forwardMostMove))
                DisplayMove(currentMove - 1);

            if (forwardMostMove != 0) {
                if (gameMode != PlayFromGameFile && gameMode != EditGame
                    && lastSavedGame != GameCheckSum() // [HGM] save: suppress duplicates
                                                                ) {
                    if (*appData.saveGameFile != NULLCHAR) {
                        SaveGameToFile(appData.saveGameFile, TRUE);
                    } else if (appData.autoSaveGames) {
                        AutoSaveGame();
                    }
                    if (*appData.savePositionFile != NULLCHAR) {
                        SavePositionToFile(appData.savePositionFile);
                    }
                }
            }

            /* Tell program how game ended in case it is learning */
            /* [HGM] Moved this to after saving the PGN, just in case */
            /* engine died and we got here through time loss. In that */
            /* case we will get a fatal error writing the pipe, which */
            /* would otherwise lose us the PGN.                       */
            /* [HGM] crash: not needed anymore, but doesn't hurt;     */
            /* output during GameEnds should never be fatal anymore   */
            if (gameMode == MachinePlaysWhite ||
                gameMode == MachinePlaysBlack ||
                gameMode == TwoMachinesPlay ||
                gameMode == IcsPlayingWhite ||
                gameMode == IcsPlayingBlack ||
                gameMode == BeginningOfGame) {
                char buf[MSG_SIZ];
                snprintf(buf, MSG_SIZ, "result %s {%s}\n", PGNResult(result),
                        resultDetails);
                if (first.pr != NoProc) {
                    SendToProgram(buf, &first);
                }
                if (second.pr != NoProc &&
                    gameMode == TwoMachinesPlay) {
                    SendToProgram(buf, &second);
                }
            }
        }

        if (appData.icsActive) {
            if (appData.quietPlay &&
                (gameMode == IcsPlayingWhite ||
                 gameMode == IcsPlayingBlack)) {
                SendToICS(ics_prefix);
                SendToICS("set shout 1\n");
            }
            nextGameMode = IcsIdle;
            ics_user_moved = FALSE;
            /* clean up premove.  It's ugly when the game has ended and the
             * premove highlights are still on the board.
             */
            if (gotPremove) {
              gotPremove = FALSE;
              ClearPremoveHighlights();
              DrawPosition(FALSE, boards[currentMove]);
            }
            if (whosays == GE_ICS) {
                switch (result) {
                case WhiteWins:
                    if (gameMode == IcsPlayingWhite)
                        PlayIcsWinSound();
                    else if(gameMode == IcsPlayingBlack)
                        PlayIcsLossSound();
                    break;
                case BlackWins:
                    if (gameMode == IcsPlayingBlack)
                        PlayIcsWinSound();
                    else if(gameMode == IcsPlayingWhite)
                        PlayIcsLossSound();
                    break;
                case GameIsDrawn:
                    PlayIcsDrawSound();
                    break;
                default:
                    PlayIcsUnfinishedSound();
                }
            }
        } else if (gameMode == EditGame ||
                   gameMode == PlayFromGameFile ||
                   gameMode == AnalyzeMode ||
                   gameMode == AnalyzeFile) {
            nextGameMode = gameMode;
        } else {
            nextGameMode = EndOfGame;
        }
        pausing = FALSE;
        ModeHighlight();
    } else {
        nextGameMode = gameMode;
    }

    if (appData.noChessProgram) {
        gameMode = nextGameMode;
        ModeHighlight();
        endingGame = 0; /* [HGM] crash */
        return;
    }

    if (first.reuse) {
        /* Put first chess program into idle state */
        if (first.pr != NoProc &&
            (gameMode == MachinePlaysWhite ||
             gameMode == MachinePlaysBlack ||
             gameMode == TwoMachinesPlay ||
             gameMode == IcsPlayingWhite ||
             gameMode == IcsPlayingBlack ||
             gameMode == BeginningOfGame)) {
            SendToProgram("force\n", &first);
            if (first.usePing) {
              char buf[MSG_SIZ];
              snprintf(buf, MSG_SIZ, "ping %d\n", ++first.lastPing);
              SendToProgram(buf, &first);
            }
        }
    } else if (result != GameUnfinished || nextGameMode == IcsIdle) {
        /* Kill off first chess program */
        if (first.isr != NULL)
          RemoveInputSource(first.isr);
        first.isr = NULL;

        if (first.pr != NoProc) {
            ExitAnalyzeMode();
            DoSleep( appData.delayBeforeQuit );
            SendToProgram("quit\n", &first);
            DoSleep( appData.delayAfterQuit );
            DestroyChildProcess(first.pr, first.useSigterm);
        }
        first.pr = NoProc;
    }
    if (second.reuse) {
        /* Put second chess program into idle state */
        if (second.pr != NoProc &&
            gameMode == TwoMachinesPlay) {
            SendToProgram("force\n", &second);
            if (second.usePing) {
              char buf[MSG_SIZ];
              snprintf(buf, MSG_SIZ, "ping %d\n", ++second.lastPing);
              SendToProgram(buf, &second);
            }
        }
    } else if (result != GameUnfinished || nextGameMode == IcsIdle) {
        /* Kill off second chess program */
        if (second.isr != NULL)
          RemoveInputSource(second.isr);
        second.isr = NULL;

        if (second.pr != NoProc) {
            DoSleep( appData.delayBeforeQuit );
            SendToProgram("quit\n", &second);
            DoSleep( appData.delayAfterQuit );
            DestroyChildProcess(second.pr, second.useSigterm);
        }
        second.pr = NoProc;
    }

    if (matchMode && (gameMode == TwoMachinesPlay || waitingForGame && exiting)) {
        char resChar = '=';
        switch (result) {
        case WhiteWins:
          resChar = '+';
          if (first.twoMachinesColor[0] == 'w') {
            first.matchWins++;
          } else {
            second.matchWins++;
          }
          break;
        case BlackWins:
          resChar = '-';
          if (first.twoMachinesColor[0] == 'b') {
            first.matchWins++;
          } else {
            second.matchWins++;
          }
          break;
        case GameUnfinished:
          resChar = ' ';
        default:
          break;
        }

        if(waitingForGame) resChar = ' '; // quit while waiting for round sync: unreserve already reserved game
        if(appData.tourneyFile[0]){ // [HGM] we are in a tourney; update tourney file with game result
            if(appData.afterGame && appData.afterGame[0]) RunCommand(appData.afterGame);
            ReserveGame(nextGame, resChar); // sets nextGame
            if(nextGame > appData.matchGames) appData.tourneyFile[0] = 0, ranking = TourneyStandings(3); // tourney is done
            else ranking = strdup("busy"); //suppress popup when aborted but not finished
        } else roundNr = nextGame = matchGame + 1; // normal match, just increment; round equals matchGame

        if (nextGame <= appData.matchGames && !abortMatch) {
            gameMode = nextGameMode;
            matchGame = nextGame; // this will be overruled in tourney mode!
            GetTimeMark(&pauseStart); // [HGM] matchpause: stipulate a pause
            ScheduleDelayedEvent(NextMatchGame, 10); // but start game immediately (as it will wait out the pause itself)
            endingGame = 0; /* [HGM] crash */
            return;
        } else {
            gameMode = nextGameMode;
            snprintf(buf, MSG_SIZ, _("Match %s vs. %s: final score %d-%d-%d"),
                     first.tidy, second.tidy,
                     first.matchWins, second.matchWins,
                     appData.matchGames - (first.matchWins + second.matchWins));
            if(!appData.tourneyFile[0]) matchGame++, DisplayTwoMachinesTitle(); // [HGM] update result in window title
            if(ranking && strcmp(ranking, "busy") && appData.afterTourney && appData.afterTourney[0]) RunCommand(appData.afterTourney);
            popupRequested++; // [HGM] crash: postpone to after resetting endingGame
            if (appData.firstPlaysBlack) { // [HGM] match: back to original for next match
                first.twoMachinesColor = "black\n";
                second.twoMachinesColor = "white\n";
            } else {
                first.twoMachinesColor = "white\n";
                second.twoMachinesColor = "black\n";
            }
        }
    }
    if ((gameMode == AnalyzeMode || gameMode == AnalyzeFile) &&
        !(nextGameMode == AnalyzeMode || nextGameMode == AnalyzeFile))
      ExitAnalyzeMode();
    gameMode = nextGameMode;
    ModeHighlight();
    endingGame = 0;  /* [HGM] crash */
    if(popupRequested) { // [HGM] crash: this calls GameEnds recursively through ExitEvent! Make it a harmless tail recursion.
        if(matchMode == TRUE) { // match through command line: exit with or without popup
            if(ranking) {
                ToNrEvent(forwardMostMove);
                if(strcmp(ranking, "busy")) DisplayFatalError(ranking, 0, 0);
                else ExitEvent(0);
            } else DisplayFatalError(buf, 0, 0);
        } else { // match through menu; just stop, with or without popup
            matchMode = FALSE; appData.matchGames = matchGame = roundNr = 0;
            ModeHighlight();
            if(ranking){
                if(strcmp(ranking, "busy")) DisplayNote(ranking);
            } else DisplayNote(buf);
      }
      if(ranking) free(ranking);
    }
}

/* Assumes program was just initialized (initString sent).
   Leaves program in force mode. */
void
FeedMovesToProgram (ChessProgramState *cps, int upto)
{
    int i;

    if (appData.debugMode)
      fprintf(debugFP, "Feeding %smoves %d through %d to %s chess program\n",
              startedFromSetupPosition ? "position and " : "",
              backwardMostMove, upto, cps->which);
    if(currentlyInitializedVariant != gameInfo.variant) {
      char buf[MSG_SIZ];
        // [HGM] variantswitch: make engine aware of new variant
        if(cps->protocolVersion > 1 && StrStr(cps->variants, VariantName(gameInfo.variant)) == NULL)
                return; // [HGM] refrain from feeding moves altogether if variant is unsupported!
        snprintf(buf, MSG_SIZ, "variant %s\n", VariantName(gameInfo.variant));
        SendToProgram(buf, cps);
        currentlyInitializedVariant = gameInfo.variant;
    }
    SendToProgram("force\n", cps);
    if (startedFromSetupPosition) {
        SendBoard(cps, backwardMostMove);
    if (appData.debugMode) {
        fprintf(debugFP, "feedMoves\n");
    }
    }
    for (i = backwardMostMove; i < upto; i++) {
        SendMoveToProgram(i, cps);
    }
}


int
ResurrectChessProgram ()
{
     /* The chess program may have exited.
        If so, restart it and feed it all the moves made so far. */
    static int doInit = 0;

    if (appData.noChessProgram) return 1;

    if(matchMode && appData.tourneyFile[0]) { // [HGM] tourney: make sure we get features after engine replacement. (Should we always do this?)
        if(WaitForEngine(&first, TwoMachinesEventIfReady)) { doInit = 1; return 0; } // request to do init on next visit
        if(!doInit) return 1; // this replaces testing first.pr != NoProc, which is true when we get here, but first time no reason to abort
        doInit = 0; // we fell through (first time after starting the engine); make sure it doesn't happen again
    } else {
        if (first.pr != NoProc) return 1;
        StartChessProgram(&first);
    }
    InitChessProgram(&first, FALSE);
    FeedMovesToProgram(&first, currentMove);

    if (!first.sendTime) {
        /* can't tell gnuchess what its clock should read,
           so we bow to its notion. */
        ResetClocks();
        timeRemaining[0][currentMove] = whiteTimeRemaining;
        timeRemaining[1][currentMove] = blackTimeRemaining;
    }

    if ((gameMode == AnalyzeMode || gameMode == AnalyzeFile ||
                appData.icsEngineAnalyze) && first.analysisSupport) {
      SendToProgram("analyze\n", &first);
      first.analyzing = TRUE;
    }
    return 1;
}

/*
 * Button procedures
 */
void
Reset (int redraw, int init)
{
    int i;

    if (appData.debugMode) {
        fprintf(debugFP, "Reset(%d, %d) from gameMode %d\n",
                redraw, init, gameMode);
    }
    CleanupTail(); // [HGM] vari: delete any stored variations
    CommentPopDown(); // [HGM] make sure no comments to the previous game keep hanging on
    pausing = pauseExamInvalid = FALSE;
    startedFromSetupPosition = blackPlaysFirst = FALSE;
    firstMove = TRUE;
    whiteFlag = blackFlag = FALSE;
    userOfferedDraw = FALSE;
    hintRequested = bookRequested = FALSE;
    first.maybeThinking = FALSE;
    second.maybeThinking = FALSE;
    first.bookSuspend = FALSE; // [HGM] book
    second.bookSuspend = FALSE;
    thinkOutput[0] = NULLCHAR;
    lastHint[0] = NULLCHAR;
    ClearGameInfo(&gameInfo);
    gameInfo.variant = StringToVariant(appData.variant);
    ics_user_moved = ics_clock_paused = FALSE;
    ics_getting_history = H_FALSE;
    ics_gamenum = -1;
    white_holding[0] = black_holding[0] = NULLCHAR;
    ClearProgramStats();
    opponentKibitzes = FALSE; // [HGM] kibitz: do not reserve space in engine-output window in zippy mode

    ResetFrontEnd();
    ClearHighlights();
    flipView = appData.flipView;
    ClearPremoveHighlights();
    gotPremove = FALSE;
    alarmSounded = FALSE;

    GameEnds(EndOfFile, NULL, GE_PLAYER);
    if(appData.serverMovesName != NULL) {
        /* [HGM] prepare to make moves file for broadcasting */
        clock_t t = clock();
        if(serverMoves != NULL) fclose(serverMoves);
        serverMoves = fopen(appData.serverMovesName, "r");
        if(serverMoves != NULL) {
            fclose(serverMoves);
            /* delay 15 sec before overwriting, so all clients can see end */
            while(clock()-t < appData.serverPause*CLOCKS_PER_SEC);
        }
        serverMoves = fopen(appData.serverMovesName, "w");
    }

    ExitAnalyzeMode();
    gameMode = BeginningOfGame;
    ModeHighlight();
    if(appData.icsActive) gameInfo.variant = VariantNormal;
    currentMove = forwardMostMove = backwardMostMove = 0;
    MarkTargetSquares(1);
    InitPosition(redraw);
    for (i = 0; i < MAX_MOVES; i++) {
        if (commentList[i] != NULL) {
            free(commentList[i]);
            commentList[i] = NULL;
        }
    }
    ResetClocks();
    timeRemaining[0][0] = whiteTimeRemaining;
    timeRemaining[1][0] = blackTimeRemaining;

    if (first.pr == NoProc) {
        StartChessProgram(&first);
    }
    if (init) {
            InitChessProgram(&first, startedFromSetupPosition);
    }
    DisplayTitle("");
    DisplayMessage("", "");
    HistorySet(parseList, backwardMostMove, forwardMostMove, currentMove-1);
    lastSavedGame = 0; // [HGM] save: make sure next game counts as unsaved
}

void
AutoPlayGameLoop ()
{
    for (;;) {
        if (!AutoPlayOneMove())
          return;
        if (matchMode || appData.timeDelay == 0)
          continue;
        if (appData.timeDelay < 0)
          return;
        StartLoadGameTimer((long)(1000.0 * appData.timeDelay));
        break;
    }
}


int
AutoPlayOneMove ()
{
    int fromX, fromY, toX, toY;

    if (appData.debugMode) {
      fprintf(debugFP, "AutoPlayOneMove(): current %d\n", currentMove);
    }

    if (gameMode != PlayFromGameFile && gameMode != AnalyzeFile)
      return FALSE;

    if (gameMode == AnalyzeFile && currentMove > backwardMostMove) {
      pvInfoList[currentMove].depth = programStats.depth;
      pvInfoList[currentMove].score = programStats.score;
      pvInfoList[currentMove].time  = 0;
      if(currentMove < forwardMostMove) AppendComment(currentMove+1, lastPV[0], 2);
    }

    if (currentMove >= forwardMostMove) {
      if(gameMode == AnalyzeFile) { ExitAnalyzeMode(); SendToProgram("force\n", &first); }
//      gameMode = EndOfGame;
//      ModeHighlight();

      /* [AS] Clear current move marker at the end of a game */
      /* HistorySet(parseList, backwardMostMove, forwardMostMove, -1); */

      return FALSE;
    }

    toX = moveList[currentMove][2] - AAA;
    toY = moveList[currentMove][3] - ONE;

    if (moveList[currentMove][1] == '@') {
        if (appData.highlightLastMove) {
            SetHighlights(-1, -1, toX, toY);
        }
    } else {
        fromX = moveList[currentMove][0] - AAA;
        fromY = moveList[currentMove][1] - ONE;

        HistorySet(parseList, backwardMostMove, forwardMostMove, currentMove); /* [AS] */

        AnimateMove(boards[currentMove], fromX, fromY, toX, toY);

        if (appData.highlightLastMove) {
            SetHighlights(fromX, fromY, toX, toY);
        }
    }
    DisplayMove(currentMove);
    SendMoveToProgram(currentMove++, &first);
    DisplayBothClocks();
    DrawPosition(FALSE, boards[currentMove]);
    // [HGM] PV info: always display, routine tests if empty
    DisplayComment(currentMove - 1, commentList[currentMove]);
    return TRUE;
}


int
LoadGameOneMove (ChessMove readAhead)
{
    int fromX = 0, fromY = 0, toX = 0, toY = 0, done;
    char promoChar = NULLCHAR;
    ChessMove moveType;
    char move[MSG_SIZ];
    char *p, *q;

    if (gameMode != PlayFromGameFile && gameMode != AnalyzeFile &&
        gameMode != AnalyzeMode && gameMode != Training) {
        gameFileFP = NULL;
        return FALSE;
    }

    yyboardindex = forwardMostMove;
    if (readAhead != EndOfFile) {
      moveType = readAhead;
    } else {
      if (gameFileFP == NULL)
          return FALSE;
      moveType = (ChessMove) Myylex();
    }

    done = FALSE;
    switch (moveType) {
      case Comment:
        if (appData.debugMode)
          fprintf(debugFP, "Parsed Comment: %s\n", yy_text);
        p = yy_text;

        /* append the comment but don't display it */
        AppendComment(currentMove, p, FALSE);
        return TRUE;

      case WhiteCapturesEnPassant:
      case BlackCapturesEnPassant:
      case WhitePromotion:
      case BlackPromotion:
      case WhiteNonPromotion:
      case BlackNonPromotion:
      case NormalMove:
      case WhiteKingSideCastle:
      case WhiteQueenSideCastle:
      case BlackKingSideCastle:
      case BlackQueenSideCastle:
      case WhiteKingSideCastleWild:
      case WhiteQueenSideCastleWild:
      case BlackKingSideCastleWild:
      case BlackQueenSideCastleWild:
      /* PUSH Fabien */
      case WhiteHSideCastleFR:
      case WhiteASideCastleFR:
      case BlackHSideCastleFR:
      case BlackASideCastleFR:
      /* POP Fabien */
        if (appData.debugMode)
          fprintf(debugFP, "Parsed %s into %s\n", yy_text, currentMoveString);
        fromX = currentMoveString[0] - AAA;
        fromY = currentMoveString[1] - ONE;
        toX = currentMoveString[2] - AAA;
        toY = currentMoveString[3] - ONE;
        promoChar = currentMoveString[4];
        break;

      case WhiteDrop:
      case BlackDrop:
        if (appData.debugMode)
          fprintf(debugFP, "Parsed %s into %s\n", yy_text, currentMoveString);
        fromX = moveType == WhiteDrop ?
          (int) CharToPiece(ToUpper(currentMoveString[0])) :
        (int) CharToPiece(ToLower(currentMoveString[0]));
        fromY = DROP_RANK;
        toX = currentMoveString[2] - AAA;
        toY = currentMoveString[3] - ONE;
        break;

      case WhiteWins:
      case BlackWins:
      case GameIsDrawn:
      case GameUnfinished:
        if (appData.debugMode)
          fprintf(debugFP, "Parsed game end: %s\n", yy_text);
        p = strchr(yy_text, '{');
        if (p == NULL) p = strchr(yy_text, '(');
        if (p == NULL) {
            p = yy_text;
            if (p[0] == '0' || p[0] == '1' || p[0] == '*') p = "";
        } else {
            q = strchr(p, *p == '{' ? '}' : ')');
            if (q != NULL) *q = NULLCHAR;
            p++;
        }
        while(q = strchr(p, '\n')) *q = ' '; // [HGM] crush linefeeds in result message
        GameEnds(moveType, p, GE_FILE);
        done = TRUE;
        if (cmailMsgLoaded) {
            ClearHighlights();
            flipView = WhiteOnMove(currentMove);
            if (moveType == GameUnfinished) flipView = !flipView;
            if (appData.debugMode)
              fprintf(debugFP, "Setting flipView to %d\n", flipView) ;
        }
        break;

      case EndOfFile:
        if (appData.debugMode)
          fprintf(debugFP, "Parser hit end of file\n");
        switch (MateTest(boards[currentMove], PosFlags(currentMove)) ) {
          case MT_NONE:
          case MT_CHECK:
            break;
          case MT_CHECKMATE:
          case MT_STAINMATE:
            if (WhiteOnMove(currentMove)) {
                GameEnds(BlackWins, "Black mates", GE_FILE);
            } else {
                GameEnds(WhiteWins, "White mates", GE_FILE);
            }
            break;
          case MT_STALEMATE:
            GameEnds(GameIsDrawn, "Stalemate", GE_FILE);
            break;
        }
        done = TRUE;
        break;

      case MoveNumberOne:
        if (lastLoadGameStart == GNUChessGame) {
            /* GNUChessGames have numbers, but they aren't move numbers */
            if (appData.debugMode)
              fprintf(debugFP, "Parser ignoring: '%s' (%d)\n",
                      yy_text, (int) moveType);
            return LoadGameOneMove(EndOfFile); /* tail recursion */
        }
        /* else fall thru */

      case XBoardGame:
      case GNUChessGame:
      case PGNTag:
        /* Reached start of next game in file */
        if (appData.debugMode)
          fprintf(debugFP, "Parsed start of next game: %s\n", yy_text);
        switch (MateTest(boards[currentMove], PosFlags(currentMove)) ) {
          case MT_NONE:
          case MT_CHECK:
            break;
          case MT_CHECKMATE:
          case MT_STAINMATE:
            if (WhiteOnMove(currentMove)) {
                GameEnds(BlackWins, "Black mates", GE_FILE);
            } else {
                GameEnds(WhiteWins, "White mates", GE_FILE);
            }
            break;
          case MT_STALEMATE:
            GameEnds(GameIsDrawn, "Stalemate", GE_FILE);
            break;
        }
        done = TRUE;
        break;

      case PositionDiagram:     /* should not happen; ignore */
      case ElapsedTime:         /* ignore */
      case NAG:                 /* ignore */
        if (appData.debugMode)
          fprintf(debugFP, "Parser ignoring: '%s' (%d)\n",
                  yy_text, (int) moveType);
        return LoadGameOneMove(EndOfFile); /* tail recursion */

      case IllegalMove:
        if (appData.testLegality) {
            if (appData.debugMode)
              fprintf(debugFP, "Parsed IllegalMove: %s\n", yy_text);
            snprintf(move, MSG_SIZ, _("Illegal move: %d.%s%s"),
                    (forwardMostMove / 2) + 1,
                    WhiteOnMove(forwardMostMove) ? " " : ".. ", yy_text);
            DisplayError(move, 0);
            done = TRUE;
        } else {
            if (appData.debugMode)
              fprintf(debugFP, "Parsed %s into IllegalMove %s\n",
                      yy_text, currentMoveString);
            fromX = currentMoveString[0] - AAA;
            fromY = currentMoveString[1] - ONE;
            toX = currentMoveString[2] - AAA;
            toY = currentMoveString[3] - ONE;
            promoChar = currentMoveString[4];
        }
        break;

      case AmbiguousMove:
        if (appData.debugMode)
          fprintf(debugFP, "Parsed AmbiguousMove: %s\n", yy_text);
        snprintf(move, MSG_SIZ, _("Ambiguous move: %d.%s%s"),
                (forwardMostMove / 2) + 1,
                WhiteOnMove(forwardMostMove) ? " " : ".. ", yy_text);
        DisplayError(move, 0);
        done = TRUE;
        break;

      default:
      case ImpossibleMove:
        if (appData.debugMode)
          fprintf(debugFP, "Parsed ImpossibleMove (type = %d): %s\n", moveType, yy_text);
        snprintf(move, MSG_SIZ, _("Illegal move: %d.%s%s"),
                (forwardMostMove / 2) + 1,
                WhiteOnMove(forwardMostMove) ? " " : ".. ", yy_text);
        DisplayError(move, 0);
        done = TRUE;
        break;
    }

    if (done) {
        if (appData.matchMode || (appData.timeDelay == 0 && !pausing)) {
            DrawPosition(FALSE, boards[currentMove]);
            DisplayBothClocks();
            if (!appData.matchMode) // [HGM] PV info: routine tests if empty
              DisplayComment(currentMove - 1, commentList[currentMove]);
        }
        (void) StopLoadGameTimer();
        gameFileFP = NULL;
        cmailOldMove = forwardMostMove;
        return FALSE;
    } else {
        /* currentMoveString is set as a side-effect of yylex */

        thinkOutput[0] = NULLCHAR;
        MakeMove(fromX, fromY, toX, toY, promoChar);
        currentMove = forwardMostMove;
        return TRUE;
    }
}

/* Load the nth game from the given file */
int
LoadGameFromFile (char *filename, int n, char *title, int useList)
{
    FILE *f;
    char buf[MSG_SIZ];

    if (strcmp(filename, "-") == 0) {
        f = stdin;
        title = "stdin";
    } else {
        f = fopen(filename, "rb");
        if (f == NULL) {
          snprintf(buf, sizeof(buf),  _("Can't open \"%s\""), filename);
            DisplayError(buf, errno);
            return FALSE;
        }
    }
    if (fseek(f, 0, 0) == -1) {
        /* f is not seekable; probably a pipe */
        useList = FALSE;
    }
    if (useList && n == 0) {
        int error = GameListBuild(f);
        if (error) {
            DisplayError(_("Cannot build game list"), error);
        } else if (!ListEmpty(&gameList) &&
                   ((ListGame *) gameList.tailPred)->number > 1) {
            GameListPopUp(f, title);
            return TRUE;
        }
        GameListDestroy();
        n = 1;
    }
    if (n == 0) n = 1;
    return LoadGame(f, n, title, FALSE);
}


void
MakeRegisteredMove ()
{
    int fromX, fromY, toX, toY;
    char promoChar;
    if (cmailMoveRegistered[lastLoadGameNumber - 1]) {
        switch (cmailMoveType[lastLoadGameNumber - 1]) {
          case CMAIL_MOVE:
          case CMAIL_DRAW:
            if (appData.debugMode)
              fprintf(debugFP, "Restoring %s for game %d\n",
                      cmailMove[lastLoadGameNumber - 1], lastLoadGameNumber);

            thinkOutput[0] = NULLCHAR;
            safeStrCpy(moveList[currentMove], cmailMove[lastLoadGameNumber - 1], sizeof(moveList[currentMove])/sizeof(moveList[currentMove][0]));
            fromX = cmailMove[lastLoadGameNumber - 1][0] - AAA;
            fromY = cmailMove[lastLoadGameNumber - 1][1] - ONE;
            toX = cmailMove[lastLoadGameNumber - 1][2] - AAA;
            toY = cmailMove[lastLoadGameNumber - 1][3] - ONE;
            promoChar = cmailMove[lastLoadGameNumber - 1][4];
            MakeMove(fromX, fromY, toX, toY, promoChar);
            ShowMove(fromX, fromY, toX, toY);

            switch (MateTest(boards[currentMove], PosFlags(currentMove)) ) {
              case MT_NONE:
              case MT_CHECK:
                break;

              case MT_CHECKMATE:
              case MT_STAINMATE:
                if (WhiteOnMove(currentMove)) {
                    GameEnds(BlackWins, "Black mates", GE_PLAYER);
                } else {
                    GameEnds(WhiteWins, "White mates", GE_PLAYER);
                }
                break;

              case MT_STALEMATE:
                GameEnds(GameIsDrawn, "Stalemate", GE_PLAYER);
                break;
            }

            break;

          case CMAIL_RESIGN:
            if (WhiteOnMove(currentMove)) {
                GameEnds(BlackWins, "White resigns", GE_PLAYER);
            } else {
                GameEnds(WhiteWins, "Black resigns", GE_PLAYER);
            }
            break;

          case CMAIL_ACCEPT:
            GameEnds(GameIsDrawn, "Draw agreed", GE_PLAYER);
            break;

          default:
            break;
        }
    }

    return;
}

/* Wrapper around LoadGame for use when a Cmail message is loaded */
int
CmailLoadGame (FILE *f, int gameNumber, char *title, int useList)
{
    int retVal;

    if (gameNumber > nCmailGames) {
        DisplayError(_("No more games in this message"), 0);
        return FALSE;
    }
    if (f == lastLoadGameFP) {
        int offset = gameNumber - lastLoadGameNumber;
        if (offset == 0) {
            cmailMsg[0] = NULLCHAR;
            if (cmailMoveRegistered[lastLoadGameNumber - 1]) {
                cmailMoveRegistered[lastLoadGameNumber - 1] = FALSE;
                nCmailMovesRegistered--;
            }
            cmailMoveType[lastLoadGameNumber - 1] = CMAIL_MOVE;
            if (cmailResult[lastLoadGameNumber - 1] == CMAIL_NEW_RESULT) {
                cmailResult[lastLoadGameNumber - 1] = CMAIL_NOT_RESULT;
            }
        } else {
            if (! RegisterMove()) return FALSE;
        }
    }

    retVal = LoadGame(f, gameNumber, title, useList);

    /* Make move registered during previous look at this game, if any */
    MakeRegisteredMove();

    if (cmailCommentList[lastLoadGameNumber - 1] != NULL) {
        commentList[currentMove]
          = StrSave(cmailCommentList[lastLoadGameNumber - 1]);
        DisplayComment(currentMove - 1, commentList[currentMove]);
    }

    return retVal;
}

/* Support for LoadNextGame, LoadPreviousGame, ReloadSameGame */
int
ReloadGame (int offset)
{
    int gameNumber = lastLoadGameNumber + offset;
    if (lastLoadGameFP == NULL) {
        DisplayError(_("No game has been loaded yet"), 0);
        return FALSE;
    }
    if (gameNumber <= 0) {
        DisplayError(_("Can't back up any further"), 0);
        return FALSE;
    }
    if (cmailMsgLoaded) {
        return CmailLoadGame(lastLoadGameFP, gameNumber,
                             lastLoadGameTitle, lastLoadGameUseList);
    } else {
        return LoadGame(lastLoadGameFP, gameNumber,
                        lastLoadGameTitle, lastLoadGameUseList);
    }
}

int keys[EmptySquare+1];

int
PositionMatches (Board b1, Board b2)
{
    int r, f, sum=0;
    switch(appData.searchMode) {
        case 1: return CompareWithRights(b1, b2);
        case 2:
            for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) {
                if(b2[r][f] != EmptySquare && b1[r][f] != b2[r][f]) return FALSE;
            }
            return TRUE;
        case 3:
            for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) {
              if((b2[r][f] == WhitePawn || b2[r][f] == BlackPawn) && b1[r][f] != b2[r][f]) return FALSE;
                sum += keys[b1[r][f]] - keys[b2[r][f]];
            }
            return sum==0;
        case 4:
            for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) {
                sum += keys[b1[r][f]] - keys[b2[r][f]];
            }
            return sum==0;
    }
    return TRUE;
}

#define Q_PROMO  4
#define Q_EP     3
#define Q_BCASTL 2
#define Q_WCASTL 1

int pieceList[256], quickBoard[256];
ChessSquare pieceType[256] = { EmptySquare };
Board soughtBoard, reverseBoard, flipBoard, rotateBoard;
int counts[EmptySquare], minSought[EmptySquare], minReverse[EmptySquare], maxSought[EmptySquare], maxReverse[EmptySquare];
int soughtTotal, turn;
Boolean epOK, flipSearch;

typedef struct {
    unsigned char piece, to;
} Move;

#define DSIZE (250000)

Move initialSpace[DSIZE+1000]; // gamble on that game will not be more than 500 moves
Move *moveDatabase = initialSpace;
unsigned int movePtr, dataSize = DSIZE;

int
MakePieceList (Board board, int *counts)
{
    int r, f, n=Q_PROMO, total=0;
    for(r=0;r<EmptySquare;r++) counts[r] = 0; // piece-type counts
    for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) {
        int sq = f + (r<<4);
        if(board[r][f] == EmptySquare) quickBoard[sq] = 0; else {
            quickBoard[sq] = ++n;
            pieceList[n] = sq;
            pieceType[n] = board[r][f];
            counts[board[r][f]]++;
            if(board[r][f] == WhiteKing) pieceList[1] = n; else
            if(board[r][f] == BlackKing) pieceList[2] = n; // remember which are Kings, for castling
            total++;
        }
    }
    epOK = gameInfo.variant != VariantXiangqi && gameInfo.variant != VariantBerolina;
    return total;
}

void
PackMove (int fromX, int fromY, int toX, int toY, ChessSquare promoPiece)
{
    int sq = fromX + (fromY<<4);
    int piece = quickBoard[sq];
    quickBoard[sq] = 0;
    moveDatabase[movePtr].to = pieceList[piece] = sq = toX + (toY<<4);
    if(piece == pieceList[1] && fromY == toY && (toX > fromX+1 || toX < fromX-1) && fromX != BOARD_LEFT && fromX != BOARD_RGHT-1) {
        int from = toX>fromX ? BOARD_RGHT-1 : BOARD_LEFT;
        moveDatabase[movePtr++].piece = Q_WCASTL;
        quickBoard[sq] = piece;
        piece = quickBoard[from]; quickBoard[from] = 0;
        moveDatabase[movePtr].to = pieceList[piece] = sq = toX>fromX ? sq-1 : sq+1;
    } else
    if(piece == pieceList[2] && fromY == toY && (toX > fromX+1 || toX < fromX-1) && fromX != BOARD_LEFT && fromX != BOARD_RGHT-1) {
        int from = (toX>fromX ? BOARD_RGHT-1 : BOARD_LEFT) + (BOARD_HEIGHT-1 <<4);
        moveDatabase[movePtr++].piece = Q_BCASTL;
        quickBoard[sq] = piece;
        piece = quickBoard[from]; quickBoard[from] = 0;
        moveDatabase[movePtr].to = pieceList[piece] = sq = toX>fromX ? sq-1 : sq+1;
    } else
    if(epOK && (pieceType[piece] == WhitePawn || pieceType[piece] == BlackPawn) && fromX != toX && quickBoard[sq] == 0) {
        quickBoard[(fromY<<4)+toX] = 0;
        moveDatabase[movePtr].piece = Q_EP;
        moveDatabase[movePtr++].to = (fromY<<4)+toX;
        moveDatabase[movePtr].to = sq;
    } else
    if(promoPiece != pieceType[piece]) {
        moveDatabase[movePtr++].piece = Q_PROMO;
        moveDatabase[movePtr].to = pieceType[piece] = (int) promoPiece;
    }
    moveDatabase[movePtr].piece = piece;
    quickBoard[sq] = piece;
    movePtr++;
}

int
PackGame (Board board)
{
    Move *newSpace = NULL;
    moveDatabase[movePtr].piece = 0; // terminate previous game
    if(movePtr > dataSize) {
        if(appData.debugMode) fprintf(debugFP, "move-cache overflow, enlarge to %d MB\n", dataSize/128);
        dataSize *= 8; // increase size by factor 8 (512KB -> 4MB -> 32MB -> 256MB -> 2GB)
        if(dataSize) newSpace = (Move*) calloc(dataSize + 1000, sizeof(Move));
        if(newSpace) {
            int i;
            Move *p = moveDatabase, *q = newSpace;
            for(i=0; i<movePtr; i++) *q++ = *p++;    // copy to newly allocated space
            if(dataSize > 8*DSIZE) free(moveDatabase); // and free old space (if it was allocated)
            moveDatabase = newSpace;
        } else { // calloc failed, we must be out of memory. Too bad...
            dataSize = 0; // prevent calloc events for all subsequent games
            return 0;     // and signal this one isn't cached
        }
    }
    movePtr++;
    MakePieceList(board, counts);
    return movePtr;
}

int
QuickCompare (Board board, int *minCounts, int *maxCounts)
{   // compare according to search mode
    int r, f;
    switch(appData.searchMode)
    {
      case 1: // exact position match
        if(!(turn & board[EP_STATUS-1])) return FALSE; // wrong side to move
        for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) {
            if(board[r][f] != pieceType[quickBoard[(r<<4)+f]]) return FALSE;
        }
        break;
      case 2: // can have extra material on empty squares
        for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) {
            if(board[r][f] == EmptySquare) continue;
            if(board[r][f] != pieceType[quickBoard[(r<<4)+f]]) return FALSE;
        }
        break;
      case 3: // material with exact Pawn structure
        for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) {
            if(board[r][f] != WhitePawn && board[r][f] != BlackPawn) continue;
            if(board[r][f] != pieceType[quickBoard[(r<<4)+f]]) return FALSE;
        } // fall through to material comparison
      case 4: // exact material
        for(r=0; r<EmptySquare; r++) if(counts[r] != maxCounts[r]) return FALSE;
        break;
      case 6: // material range with given imbalance
        for(r=0; r<BlackPawn; r++) if(counts[r] - minCounts[r] != counts[r+BlackPawn] - minCounts[r+BlackPawn]) return FALSE;
        // fall through to range comparison
      case 5: // material range
        for(r=0; r<EmptySquare; r++) if(counts[r] < minCounts[r] || counts[r] > maxCounts[r]) return FALSE;
    }
    return TRUE;
}

int
QuickScan (Board board, Move *move)
{   // reconstruct game,and compare all positions in it
    int cnt=0, stretch=0, total = MakePieceList(board, counts);
    do {
        int piece = move->piece;
        int to = move->to, from = pieceList[piece];
        if(piece <= Q_PROMO) { // special moves encoded by otherwise invalid piece numbers 1-4
          if(!piece) return -1;
          if(piece == Q_PROMO) { // promotion, encoded as (Q_PROMO, to) + (piece, promoType)
            piece = (++move)->piece;
            from = pieceList[piece];
            counts[pieceType[piece]]--;
            pieceType[piece] = (ChessSquare) move->to;
            counts[move->to]++;
          } else if(piece == Q_EP) { // e.p. capture, encoded as (Q_EP, ep-sqr) + (piece, to)
            counts[pieceType[quickBoard[to]]]--;
            quickBoard[to] = 0; total--;
            move++;
            continue;
          } else if(piece <= Q_BCASTL) { // castling, encoded as (Q_XCASTL, king-to) + (rook, rook-to)
            piece = pieceList[piece]; // first two elements of pieceList contain King numbers
            from  = pieceList[piece]; // so this must be King
            quickBoard[from] = 0;
            quickBoard[to] = piece;
            pieceList[piece] = to;
            move++;
            continue;
          }
        }
        if(appData.searchMode > 2) counts[pieceType[quickBoard[to]]]--; // account capture
        if((total -= (quickBoard[to] != 0)) < soughtTotal) return -1; // piece count dropped below what we search for
        quickBoard[from] = 0;
        quickBoard[to] = piece;
        pieceList[piece] = to;
        cnt++; turn ^= 3;
        if(QuickCompare(soughtBoard, minSought, maxSought) ||
           appData.ignoreColors && QuickCompare(reverseBoard, minReverse, maxReverse) ||
           flipSearch && (QuickCompare(flipBoard, minSought, maxSought) ||
                                appData.ignoreColors && QuickCompare(rotateBoard, minReverse, maxReverse))
          ) {
            static int lastCounts[EmptySquare+1];
            int i;
            if(stretch) for(i=0; i<EmptySquare; i++) if(lastCounts[i] != counts[i]) { stretch = 0; break; } // reset if material changes
            if(stretch++ == 0) for(i=0; i<EmptySquare; i++) lastCounts[i] = counts[i]; // remember actual material
        } else stretch = 0;
        if(stretch && (appData.searchMode == 1 || stretch >= appData.stretch)) return cnt + 1 - stretch;
        move++;
    } while(1);
}

void
InitSearch ()
{
    int r, f;
    flipSearch = FALSE;
    CopyBoard(soughtBoard, boards[currentMove]);
    soughtTotal = MakePieceList(soughtBoard, maxSought);
    soughtBoard[EP_STATUS-1] = (currentMove & 1) + 1;
    if(currentMove == 0 && gameMode == EditPosition) soughtBoard[EP_STATUS-1] = blackPlaysFirst + 1; // (!)
    CopyBoard(reverseBoard, boards[currentMove]);
    for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) {
        int piece = boards[currentMove][BOARD_HEIGHT-1-r][f];
        if(piece < BlackPawn) piece += BlackPawn; else if(piece < EmptySquare) piece -= BlackPawn; // color-flip
        reverseBoard[r][f] = piece;
    }
    reverseBoard[EP_STATUS-1] = soughtBoard[EP_STATUS-1] ^ 3; 
    for(r=0; r<6; r++) reverseBoard[CASTLING][r] = boards[currentMove][CASTLING][(r+3)%6];
    if(appData.findMirror && appData.searchMode <= 3 && (!nrCastlingRights
                 || (boards[currentMove][CASTLING][2] == NoRights || 
                     boards[currentMove][CASTLING][0] == NoRights && boards[currentMove][CASTLING][1] == NoRights )
                 && (boards[currentMove][CASTLING][5] == NoRights || 
                     boards[currentMove][CASTLING][3] == NoRights && boards[currentMove][CASTLING][4] == NoRights ) )
      ) {
        flipSearch = TRUE;
        CopyBoard(flipBoard, soughtBoard);
        CopyBoard(rotateBoard, reverseBoard);
        for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) {
            flipBoard[r][f]    = soughtBoard[r][BOARD_WIDTH-1-f];
            rotateBoard[r][f] = reverseBoard[r][BOARD_WIDTH-1-f];
        }
    }
    for(r=0; r<BlackPawn; r++) maxReverse[r] = maxSought[r+BlackPawn], maxReverse[r+BlackPawn] = maxSought[r];
    if(appData.searchMode >= 5) {
        for(r=BOARD_HEIGHT/2; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) soughtBoard[r][f] = EmptySquare;
        MakePieceList(soughtBoard, minSought);
        for(r=0; r<BlackPawn; r++) minReverse[r] = minSought[r+BlackPawn], minReverse[r+BlackPawn] = minSought[r];
    }
    if(gameInfo.variant == VariantCrazyhouse || gameInfo.variant == VariantShogi || gameInfo.variant == VariantBughouse)
        soughtTotal = 0; // in drop games nr of pieces does not fall monotonously
}

GameInfo dummyInfo;

int
GameContainsPosition (FILE *f, ListGame *lg)
{
    int next, btm=0, plyNr=0, scratch=forwardMostMove+2&~1;
    int fromX, fromY, toX, toY;
    char promoChar;
    static int initDone=FALSE;

    // weed out games based on numerical tag comparison
    if(lg->gameInfo.variant != gameInfo.variant) return -1; // wrong variant
    if(appData.eloThreshold1 && (lg->gameInfo.whiteRating < appData.eloThreshold1 && lg->gameInfo.blackRating < appData.eloThreshold1)) return -1;
    if(appData.eloThreshold2 && (lg->gameInfo.whiteRating < appData.eloThreshold2 || lg->gameInfo.blackRating < appData.eloThreshold2)) return -1;
    if(appData.dateThreshold && (!lg->gameInfo.date || atoi(lg->gameInfo.date) < appData.dateThreshold)) return -1;
    if(!initDone) {
        for(next = WhitePawn; next<EmptySquare; next++) keys[next] = random()>>8 ^ random()<<6 ^random()<<20;
        initDone = TRUE;
    }
    if(lg->gameInfo.fen) ParseFEN(boards[scratch], &btm, lg->gameInfo.fen);
    else CopyBoard(boards[scratch], initialPosition); // default start position
    if(lg->moves) {
        turn = btm + 1;
        if((next = QuickScan( boards[scratch], &moveDatabase[lg->moves] )) < 0) return -1; // quick scan rules out it is there
        if(appData.searchMode >= 4) return next; // for material searches, trust QuickScan.
    }
    if(btm) plyNr++;
    if(PositionMatches(boards[scratch], boards[currentMove])) return plyNr;
    fseek(f, lg->offset, 0);
    yynewfile(f);
    while(1) {
        yyboardindex = scratch;
        quickFlag = plyNr+1;
        next = Myylex();
        quickFlag = 0;
        switch(next) {
            case PGNTag:
                if(plyNr) return -1; // after we have seen moves, any tags will be start of next game
            default:
                continue;

            case XBoardGame:
            case GNUChessGame:
                if(plyNr) return -1; // after we have seen moves, this is for new game
              continue;

            case AmbiguousMove: // we cannot reconstruct the game beyond these two
            case ImpossibleMove:
            case WhiteWins: // game ends here with these four
            case BlackWins:
            case GameIsDrawn:
            case GameUnfinished:
                return -1;

            case IllegalMove:
                if(appData.testLegality) return -1;
            case WhiteCapturesEnPassant:
            case BlackCapturesEnPassant:
            case WhitePromotion:
            case BlackPromotion:
            case WhiteNonPromotion:
            case BlackNonPromotion:
            case NormalMove:
            case WhiteKingSideCastle:
            case WhiteQueenSideCastle:
            case BlackKingSideCastle:
            case BlackQueenSideCastle:
            case WhiteKingSideCastleWild:
            case WhiteQueenSideCastleWild:
            case BlackKingSideCastleWild:
            case BlackQueenSideCastleWild:
            case WhiteHSideCastleFR:
            case WhiteASideCastleFR:
            case BlackHSideCastleFR:
            case BlackASideCastleFR:
                fromX = currentMoveString[0] - AAA;
                fromY = currentMoveString[1] - ONE;
                toX = currentMoveString[2] - AAA;
                toY = currentMoveString[3] - ONE;
                promoChar = currentMoveString[4];
                break;
            case WhiteDrop:
            case BlackDrop:
                fromX = next == WhiteDrop ?
                  (int) CharToPiece(ToUpper(currentMoveString[0])) :
                  (int) CharToPiece(ToLower(currentMoveString[0]));
                fromY = DROP_RANK;
                toX = currentMoveString[2] - AAA;
                toY = currentMoveString[3] - ONE;
                promoChar = 0;
                break;
        }
        // Move encountered; peform it. We need to shuttle between two boards, as even/odd index determines side to move
        plyNr++;
        ApplyMove(fromX, fromY, toX, toY, promoChar, boards[scratch]);
        if(PositionMatches(boards[scratch], boards[currentMove])) return plyNr;
        if(appData.ignoreColors && PositionMatches(boards[scratch], reverseBoard)) return plyNr;
        if(appData.findMirror) {
            if(PositionMatches(boards[scratch], flipBoard)) return plyNr;
            if(appData.ignoreColors && PositionMatches(boards[scratch], rotateBoard)) return plyNr;
        }
    }
}

/* Load the nth game from open file f */
int
LoadGame (FILE *f, int gameNumber, char *title, int useList)
{
    ChessMove cm;
    char buf[MSG_SIZ];
    int gn = gameNumber;
    ListGame *lg = NULL;
    int numPGNTags = 0;
    int err, pos = -1;
    GameMode oldGameMode;
    VariantClass oldVariant = gameInfo.variant; /* [HGM] PGNvariant */

    if (appData.debugMode)
        fprintf(debugFP, "LoadGame(): on entry, gameMode %d\n", gameMode);

    if (gameMode == Training )
        SetTrainingModeOff();

    oldGameMode = gameMode;
    if (gameMode != BeginningOfGame) {
      Reset(FALSE, TRUE);
    }

    gameFileFP = f;
    if (lastLoadGameFP != NULL && lastLoadGameFP != f) {
        fclose(lastLoadGameFP);
    }

    if (useList) {
        lg = (ListGame *) ListElem(&gameList, gameNumber-1);

        if (lg) {
            fseek(f, lg->offset, 0);
            GameListHighlight(gameNumber);
            pos = lg->position;
            gn = 1;
        }
        else {
            DisplayError(_("Game number out of range"), 0);
            return FALSE;
        }
    } else {
        GameListDestroy();
        if (fseek(f, 0, 0) == -1) {
            if (f == lastLoadGameFP ?
                gameNumber == lastLoadGameNumber + 1 :
                gameNumber == 1) {
                gn = 1;
            } else {
                DisplayError(_("Can't seek on game file"), 0);
                return FALSE;
            }
        }
    }
    lastLoadGameFP = f;
    lastLoadGameNumber = gameNumber;
    safeStrCpy(lastLoadGameTitle, title, sizeof(lastLoadGameTitle)/sizeof(lastLoadGameTitle[0]));
    lastLoadGameUseList = useList;

    yynewfile(f);

    if (lg && lg->gameInfo.white && lg->gameInfo.black) {
      snprintf(buf, sizeof(buf), "%s %s %s", lg->gameInfo.white, _("vs."),
                lg->gameInfo.black);
            DisplayTitle(buf);
    } else if (*title != NULLCHAR) {
        if (gameNumber > 1) {
          snprintf(buf, MSG_SIZ, "%s %d", title, gameNumber);
            DisplayTitle(buf);
        } else {
            DisplayTitle(title);
        }
    }

    if (gameMode != AnalyzeFile && gameMode != AnalyzeMode) {
        gameMode = PlayFromGameFile;
        ModeHighlight();
    }

    currentMove = forwardMostMove = backwardMostMove = 0;
    CopyBoard(boards[0], initialPosition);
    StopClocks();

    /*
     * Skip the first gn-1 games in the file.
     * Also skip over anything that precedes an identifiable
     * start of game marker, to avoid being confused by
     * garbage at the start of the file.  Currently
     * recognized start of game markers are the move number "1",
     * the pattern "gnuchess .* game", the pattern
     * "^[#;%] [^ ]* game file", and a PGN tag block.
     * A game that starts with one of the latter two patterns
     * will also have a move number 1, possibly
     * following a position diagram.
     * 5-4-02: Let's try being more lenient and allowing a game to
     * start with an unnumbered move.  Does that break anything?
     */
    cm = lastLoadGameStart = EndOfFile;
    while (gn > 0) {
        yyboardindex = forwardMostMove;
        cm = (ChessMove) Myylex();
        switch (cm) {
          case EndOfFile:
            if (cmailMsgLoaded) {
                nCmailGames = CMAIL_MAX_GAMES - gn;
            } else {
                Reset(TRUE, TRUE);
                DisplayError(_("Game not found in file"), 0);
            }
            return FALSE;

          case GNUChessGame:
          case XBoardGame:
            gn--;
            lastLoadGameStart = cm;
            break;

          case MoveNumberOne:
            switch (lastLoadGameStart) {
              case GNUChessGame:
              case XBoardGame:
              case PGNTag:
                break;
              case MoveNumberOne:
              case EndOfFile:
                gn--;           /* count this game */
                lastLoadGameStart = cm;
                break;
              default:
                /* impossible */
                break;
            }
            break;

          case PGNTag:
            switch (lastLoadGameStart) {
              case GNUChessGame:
              case PGNTag:
              case MoveNumberOne:
              case EndOfFile:
                gn--;           /* count this game */
                lastLoadGameStart = cm;
                break;
              case XBoardGame:
                lastLoadGameStart = cm; /* game counted already */
                break;
              default:
                /* impossible */
                break;
            }
            if (gn > 0) {
                do {
                    yyboardindex = forwardMostMove;
                    cm = (ChessMove) Myylex();
                } while (cm == PGNTag || cm == Comment);
            }
            break;

          case WhiteWins:
          case BlackWins:
          case GameIsDrawn:
            if (cmailMsgLoaded && (CMAIL_MAX_GAMES == lastLoadGameNumber)) {
                if (   cmailResult[CMAIL_MAX_GAMES - gn - 1]
                    != CMAIL_OLD_RESULT) {
                    nCmailResults ++ ;
                    cmailResult[  CMAIL_MAX_GAMES
                                - gn - 1] = CMAIL_OLD_RESULT;
                }
            }
            break;

          case NormalMove:
            /* Only a NormalMove can be at the start of a game
             * without a position diagram. */
            if (lastLoadGameStart == EndOfFile ) {
              gn--;
              lastLoadGameStart = MoveNumberOne;
            }
            break;

          default:
            break;
        }
    }

    if (appData.debugMode)
      fprintf(debugFP, "Parsed game start '%s' (%d)\n", yy_text, (int) cm);

    if (cm == XBoardGame) {
        /* Skip any header junk before position diagram and/or move 1 */
        for (;;) {
            yyboardindex = forwardMostMove;
            cm = (ChessMove) Myylex();

            if (cm == EndOfFile ||
                cm == GNUChessGame || cm == XBoardGame) {
                /* Empty game; pretend end-of-file and handle later */
                cm = EndOfFile;
                break;
            }

            if (cm == MoveNumberOne || cm == PositionDiagram ||
                cm == PGNTag || cm == Comment)
              break;
        }
    } else if (cm == GNUChessGame) {
        if (gameInfo.event != NULL) {
            free(gameInfo.event);
        }
        gameInfo.event = StrSave(yy_text);
    }

    startedFromSetupPosition = FALSE;
    while (cm == PGNTag) {
        if (appData.debugMode)
          fprintf(debugFP, "Parsed PGNTag: %s\n", yy_text);
        err = ParsePGNTag(yy_text, &gameInfo);
        if (!err) numPGNTags++;

        /* [HGM] PGNvariant: automatically switch to variant given in PGN tag */
        if(gameInfo.variant != oldVariant) {
            startedFromPositionFile = FALSE; /* [HGM] loadPos: variant switch likely makes position invalid */
            ResetFrontEnd(); // [HGM] might need other bitmaps. Cannot use Reset() because it clears gameInfo :-(
            InitPosition(TRUE);
            oldVariant = gameInfo.variant;
            if (appData.debugMode)
              fprintf(debugFP, "New variant %d\n", (int) oldVariant);
        }


        if (gameInfo.fen != NULL) {
          Board initial_position;
          startedFromSetupPosition = TRUE;
          if (!ParseFEN(initial_position, &blackPlaysFirst, gameInfo.fen)) {
            Reset(TRUE, TRUE);
            DisplayError(_("Bad FEN position in file"), 0);
            return FALSE;
          }
          CopyBoard(boards[0], initial_position);
          if (blackPlaysFirst) {
            currentMove = forwardMostMove = backwardMostMove = 1;
            CopyBoard(boards[1], initial_position);
            safeStrCpy(moveList[0], "", sizeof(moveList[0])/sizeof(moveList[0][0]));
            safeStrCpy(parseList[0], "", sizeof(parseList[0])/sizeof(parseList[0][0]));
            timeRemaining[0][1] = whiteTimeRemaining;
            timeRemaining[1][1] = blackTimeRemaining;
            if (commentList[0] != NULL) {
              commentList[1] = commentList[0];
              commentList[0] = NULL;
            }
          } else {
            currentMove = forwardMostMove = backwardMostMove = 0;
          }
          /* [HGM] copy FEN attributes as well. Bugfix 4.3.14m and 4.3.15e: moved to after 'blackPlaysFirst' */
          {   int i;
              initialRulePlies = FENrulePlies;
              for( i=0; i< nrCastlingRights; i++ )
                  initialRights[i] = initial_position[CASTLING][i];
          }
          yyboardindex = forwardMostMove;
          free(gameInfo.fen);
          gameInfo.fen = NULL;
        }

        yyboardindex = forwardMostMove;
        cm = (ChessMove) Myylex();

        /* Handle comments interspersed among the tags */
        while (cm == Comment) {
            char *p;
            if (appData.debugMode)
              fprintf(debugFP, "Parsed Comment: %s\n", yy_text);
            p = yy_text;
            AppendComment(currentMove, p, FALSE);
            yyboardindex = forwardMostMove;
            cm = (ChessMove) Myylex();
        }
    }

    /* don't rely on existence of Event tag since if game was
     * pasted from clipboard the Event tag may not exist
     */
    if (numPGNTags > 0){
        char *tags;
        if (gameInfo.variant == VariantNormal) {
          VariantClass v = StringToVariant(gameInfo.event);
          // [HGM] do not recognize variants from event tag that were introduced after supporting variant tag
          if(v < VariantShogi) gameInfo.variant = v;
        }
        if (!matchMode) {
          if( appData.autoDisplayTags ) {
            tags = PGNTags(&gameInfo);
            TagsPopUp(tags, CmailMsg());
            free(tags);
          }
        }
    } else {
        /* Make something up, but don't display it now */
        SetGameInfo();
        TagsPopDown();
    }

    if (cm == PositionDiagram) {
        int i, j;
        char *p;
        Board initial_position;

        if (appData.debugMode)
          fprintf(debugFP, "Parsed PositionDiagram: %s\n", yy_text);

        if (!startedFromSetupPosition) {
            p = yy_text;
            for (i = BOARD_HEIGHT - 1; i >= 0; i--)
              for (j = BOARD_LEFT; j < BOARD_RGHT; p++)
                switch (*p) {
                  case '{':
                  case '[':
                  case '-':
                  case ' ':
                  case '\t':
                  case '\n':
                  case '\r':
                    break;
                  default:
                    initial_position[i][j++] = CharToPiece(*p);
                    break;
                }
            while (*p == ' ' || *p == '\t' ||
                   *p == '\n' || *p == '\r') p++;

            if (strncmp(p, "black", strlen("black"))==0)
              blackPlaysFirst = TRUE;
            else
              blackPlaysFirst = FALSE;
            startedFromSetupPosition = TRUE;

            CopyBoard(boards[0], initial_position);
            if (blackPlaysFirst) {
                currentMove = forwardMostMove = backwardMostMove = 1;
                CopyBoard(boards[1], initial_position);
                safeStrCpy(moveList[0], "", sizeof(moveList[0])/sizeof(moveList[0][0]));
                safeStrCpy(parseList[0], "", sizeof(parseList[0])/sizeof(parseList[0][0]));
                timeRemaining[0][1] = whiteTimeRemaining;
                timeRemaining[1][1] = blackTimeRemaining;
                if (commentList[0] != NULL) {
                    commentList[1] = commentList[0];
                    commentList[0] = NULL;
                }
            } else {
                currentMove = forwardMostMove = backwardMostMove = 0;
            }
        }
        yyboardindex = forwardMostMove;
        cm = (ChessMove) Myylex();
    }

    if (first.pr == NoProc) {
        StartChessProgram(&first);
    }
    InitChessProgram(&first, FALSE);
    SendToProgram("force\n", &first);
    if (startedFromSetupPosition) {
        SendBoard(&first, forwardMostMove);
    if (appData.debugMode) {
        fprintf(debugFP, "Load Game\n");
    }
        DisplayBothClocks();
    }

    /* [HGM] server: flag to write setup moves in broadcast file as one */
    loadFlag = appData.suppressLoadMoves;

    while (cm == Comment) {
        char *p;
        if (appData.debugMode)
          fprintf(debugFP, "Parsed Comment: %s\n", yy_text);
        p = yy_text;
        AppendComment(currentMove, p, FALSE);
        yyboardindex = forwardMostMove;
        cm = (ChessMove) Myylex();
    }

    if ((cm == EndOfFile && lastLoadGameStart != EndOfFile ) ||
        cm == WhiteWins || cm == BlackWins ||
        cm == GameIsDrawn || cm == GameUnfinished) {
        DisplayMessage("", _("No moves in game"));
        if (cmailMsgLoaded) {
            if (appData.debugMode)
              fprintf(debugFP, "Setting flipView to %d.\n", FALSE);
            ClearHighlights();
            flipView = FALSE;
        }
        DrawPosition(FALSE, boards[currentMove]);
        DisplayBothClocks();
        gameMode = EditGame;
        ModeHighlight();
        gameFileFP = NULL;
        cmailOldMove = 0;
        return TRUE;
    }

    // [HGM] PV info: routine tests if comment empty
    if (!matchMode && (pausing || appData.timeDelay != 0)) {
        DisplayComment(currentMove - 1, commentList[currentMove]);
    }
    if (!matchMode && appData.timeDelay != 0)
      DrawPosition(FALSE, boards[currentMove]);

    if (gameMode == AnalyzeFile || gameMode == AnalyzeMode) {
      programStats.ok_to_send = 1;
    }

    /* if the first token after the PGN tags is a move
     * and not move number 1, retrieve it from the parser
     */
    if (cm != MoveNumberOne)
        LoadGameOneMove(cm);

    /* load the remaining moves from the file */
    while (LoadGameOneMove(EndOfFile)) {
      timeRemaining[0][forwardMostMove] = whiteTimeRemaining;
      timeRemaining[1][forwardMostMove] = blackTimeRemaining;
    }

    /* rewind to the start of the game */
    currentMove = backwardMostMove;

    HistorySet(parseList, backwardMostMove, forwardMostMove, currentMove-1);

    if (oldGameMode == AnalyzeFile ||
        oldGameMode == AnalyzeMode) {
      AnalyzeFileEvent();
    }

    if (!matchMode && pos >= 0) {
        ToNrEvent(pos); // [HGM] no autoplay if selected on position
    } else
    if (matchMode || appData.timeDelay == 0) {
      ToEndEvent();
    } else if (appData.timeDelay > 0) {
      AutoPlayGameLoop();
    }

    if (appData.debugMode)
        fprintf(debugFP, "LoadGame(): on exit, gameMode %d\n", gameMode);

    loadFlag = 0; /* [HGM] true game starts */
    return TRUE;
}

/* Support for LoadNextPosition, LoadPreviousPosition, ReloadSamePosition */
int
ReloadPosition (int offset)
{
    int positionNumber = lastLoadPositionNumber + offset;
    if (lastLoadPositionFP == NULL) {
        DisplayError(_("No position has been loaded yet"), 0);
        return FALSE;
    }
    if (positionNumber <= 0) {
        DisplayError(_("Can't back up any further"), 0);
        return FALSE;
    }
    return LoadPosition(lastLoadPositionFP, positionNumber,
                        lastLoadPositionTitle);
}

/* Load the nth position from the given file */
int
LoadPositionFromFile (char *filename, int n, char *title)
{
    FILE *f;
    char buf[MSG_SIZ];

    if (strcmp(filename, "-") == 0) {
        return LoadPosition(stdin, n, "stdin");
    } else {
        f = fopen(filename, "rb");
        if (f == NULL) {
            snprintf(buf, sizeof(buf), _("Can't open \"%s\""), filename);
            DisplayError(buf, errno);
            return FALSE;
        } else {
            return LoadPosition(f, n, title);
        }
    }
}

/* Load the nth position from the given open file, and close it */
int
LoadPosition (FILE *f, int positionNumber, char *title)
{
    char *p, line[MSG_SIZ];
    Board initial_position;
    int i, j, fenMode, pn;

    if (gameMode == Training )
        SetTrainingModeOff();

    if (gameMode != BeginningOfGame) {
        Reset(FALSE, TRUE);
    }
    if (lastLoadPositionFP != NULL && lastLoadPositionFP != f) {
        fclose(lastLoadPositionFP);
    }
    if (positionNumber == 0) positionNumber = 1;
    lastLoadPositionFP = f;
    lastLoadPositionNumber = positionNumber;
    safeStrCpy(lastLoadPositionTitle, title, sizeof(lastLoadPositionTitle)/sizeof(lastLoadPositionTitle[0]));
    if (first.pr == NoProc && !appData.noChessProgram) {
      StartChessProgram(&first);
      InitChessProgram(&first, FALSE);
    }
    pn = positionNumber;
    if (positionNumber < 0) {
        /* Negative position number means to seek to that byte offset */
        if (fseek(f, -positionNumber, 0) == -1) {
            DisplayError(_("Can't seek on position file"), 0);
            return FALSE;
        };
        pn = 1;
    } else {
        if (fseek(f, 0, 0) == -1) {
            if (f == lastLoadPositionFP ?
                positionNumber == lastLoadPositionNumber + 1 :
                positionNumber == 1) {
                pn = 1;
            } else {
                DisplayError(_("Can't seek on position file"), 0);
                return FALSE;
            }
        }
    }
    /* See if this file is FEN or old-style xboard */
    if (fgets(line, MSG_SIZ, f) == NULL) {
        DisplayError(_("Position not found in file"), 0);
        return FALSE;
    }
    // [HGM] FEN can begin with digit, any piece letter valid in this variant, or a + for Shogi promoted pieces
    fenMode = line[0] >= '0' && line[0] <= '9' || line[0] == '+' || CharToPiece(line[0]) != EmptySquare;

    if (pn >= 2) {
        if (fenMode || line[0] == '#') pn--;
        while (pn > 0) {
            /* skip positions before number pn */
            if (fgets(line, MSG_SIZ, f) == NULL) {
                Reset(TRUE, TRUE);
                DisplayError(_("Position not found in file"), 0);
                return FALSE;
            }
            if (fenMode || line[0] == '#') pn--;
        }
    }

    if (fenMode) {
        if (!ParseFEN(initial_position, &blackPlaysFirst, line)) {
            DisplayError(_("Bad FEN position in file"), 0);
            return FALSE;
        }
    } else {
        (void) fgets(line, MSG_SIZ, f);
        (void) fgets(line, MSG_SIZ, f);

        for (i = BOARD_HEIGHT - 1; i >= 0; i--) {
            (void) fgets(line, MSG_SIZ, f);
            for (p = line, j = BOARD_LEFT; j < BOARD_RGHT; p++) {
                if (*p == ' ')
                  continue;
                initial_position[i][j++] = CharToPiece(*p);
            }
        }

        blackPlaysFirst = FALSE;
        if (!feof(f)) {
            (void) fgets(line, MSG_SIZ, f);
            if (strncmp(line, "black", strlen("black"))==0)
              blackPlaysFirst = TRUE;
        }
    }
    startedFromSetupPosition = TRUE;

    CopyBoard(boards[0], initial_position);
    if (blackPlaysFirst) {
        currentMove = forwardMostMove = backwardMostMove = 1;
        safeStrCpy(moveList[0], "", sizeof(moveList[0])/sizeof(moveList[0][0]));
        safeStrCpy(parseList[0], "", sizeof(parseList[0])/sizeof(parseList[0][0]));
        CopyBoard(boards[1], initial_position);
        DisplayMessage("", _("Black to play"));
    } else {
        currentMove = forwardMostMove = backwardMostMove = 0;
        DisplayMessage("", _("White to play"));
    }
    initialRulePlies = FENrulePlies; /* [HGM] copy FEN attributes as well */
    if(first.pr != NoProc) { // [HGM] in tourney-mode a position can be loaded before the chess engine is installed
        SendToProgram("force\n", &first);
        SendBoard(&first, forwardMostMove);
    }
    if (appData.debugMode) {
int i, j;
  for(i=0;i<2;i++){for(j=0;j<6;j++)fprintf(debugFP, " %d", boards[i][CASTLING][j]);fprintf(debugFP,"\n");}
  for(j=0;j<6;j++)fprintf(debugFP, " %d", initialRights[j]);fprintf(debugFP,"\n");
        fprintf(debugFP, "Load Position\n");
    }

    if (positionNumber > 1) {
      snprintf(line, MSG_SIZ, "%s %d", title, positionNumber);
        DisplayTitle(line);
    } else {
        DisplayTitle(title);
    }
    gameMode = EditGame;
    ModeHighlight();
    ResetClocks();
    timeRemaining[0][1] = whiteTimeRemaining;
    timeRemaining[1][1] = blackTimeRemaining;
    DrawPosition(FALSE, boards[currentMove]);

    return TRUE;
}


void
CopyPlayerNameIntoFileName (char **dest, char *src)
{
    while (*src != NULLCHAR && *src != ',') {
        if (*src == ' ') {
            *(*dest)++ = '_';
            src++;
        } else {
            *(*dest)++ = *src++;
        }
    }
}

char *
DefaultFileName (char *ext)
{
    static char def[MSG_SIZ];
    char *p;

    if (gameInfo.white != NULL && gameInfo.white[0] != '-') {
        p = def;
        CopyPlayerNameIntoFileName(&p, gameInfo.white);
        *p++ = '-';
        CopyPlayerNameIntoFileName(&p, gameInfo.black);
        *p++ = '.';
        safeStrCpy(p, ext, MSG_SIZ-2-strlen(gameInfo.white)-strlen(gameInfo.black));
    } else {
        def[0] = NULLCHAR;
    }
    return def;
}

/* Save the current game to the given file */
int
SaveGameToFile (char *filename, int append)
{
    FILE *f;
    char buf[MSG_SIZ];
    int result, i, t,tot=0;

    if (strcmp(filename, "-") == 0) {
        return SaveGame(stdout, 0, NULL);
    } else {
        for(i=0; i<10; i++) { // upto 10 tries
             f = fopen(filename, append ? "a" : "w");
             if(f && i) fprintf(f, "[Delay \"%d retries, %d msec\"]\n",i,tot);
             if(f || errno != 13) break;
             DoSleep(t = 5 + random()%11); // wait 5-15 msec
             tot += t;
        }
        if (f == NULL) {
            snprintf(buf, sizeof(buf), _("Can't open \"%s\""), filename);
            DisplayError(buf, errno);
            return FALSE;
        } else {
            safeStrCpy(buf, lastMsg, MSG_SIZ);
            DisplayMessage(_("Waiting for access to save file"), "");
            flock(fileno(f), LOCK_EX); // [HGM] lock: lock file while we are writing
            DisplayMessage(_("Saving game"), "");
            if(lseek(fileno(f), 0, SEEK_END) == -1) DisplayError(_("Bad Seek"), errno);     // better safe than sorry...
            result = SaveGame(f, 0, NULL);
            DisplayMessage(buf, "");
            return result;
        }
    }
}

char *
SavePart (char *str)
{
    static char buf[MSG_SIZ];
    char *p;

    p = strchr(str, ' ');
    if (p == NULL) return str;
    strncpy(buf, str, p - str);
    buf[p - str] = NULLCHAR;
    return buf;
}

#define PGN_MAX_LINE 75

#define PGN_SIDE_WHITE  0
#define PGN_SIDE_BLACK  1

static int
FindFirstMoveOutOfBook (int side)
{
    int result = -1;

    if( backwardMostMove == 0 && ! startedFromSetupPosition) {
        int index = backwardMostMove;
        int has_book_hit = 0;

        if( (index % 2) != side ) {
            index++;
        }

        while( index < forwardMostMove ) {
            /* Check to see if engine is in book */
            int depth = pvInfoList[index].depth;
            int score = pvInfoList[index].score;
            int in_book = 0;

            if( depth <= 2 ) {
                in_book = 1;
            }
            else if( score == 0 && depth == 63 ) {
                in_book = 1; /* Zappa */
            }
            else if( score == 2 && depth == 99 ) {
                in_book = 1; /* Abrok */
            }

            has_book_hit += in_book;

            if( ! in_book ) {
                result = index;

                break;
            }

            index += 2;
        }
    }

    return result;
}

void
GetOutOfBookInfo (char * buf)
{
    int oob[2];
    int i;
    int offset = backwardMostMove & (~1L); /* output move numbers start at 1 */

    oob[0] = FindFirstMoveOutOfBook( PGN_SIDE_WHITE );
    oob[1] = FindFirstMoveOutOfBook( PGN_SIDE_BLACK );

    *buf = '\0';

    if( oob[0] >= 0 || oob[1] >= 0 ) {
        for( i=0; i<2; i++ ) {
            int idx = oob[i];

            if( idx >= 0 ) {
                if( i > 0 && oob[0] >= 0 ) {
                    strcat( buf, "   " );
                }

                sprintf( buf+strlen(buf), "%d%s. ", (idx - offset)/2 + 1, idx & 1 ? ".." : "" );
                sprintf( buf+strlen(buf), "%s%.2f",
                    pvInfoList[idx].score >= 0 ? "+" : "",
                    pvInfoList[idx].score / 100.0 );
            }
        }
    }
}

/* Save game in PGN style and close the file */
int
SaveGamePGN (FILE *f)
{
    int i, offset, linelen, newblock;
    time_t tm;
//    char *movetext;
    char numtext[32];
    int movelen, numlen, blank;
    char move_buffer[100]; /* [AS] Buffer for move+PV info */

    offset = backwardMostMove & (~1L); /* output move numbers start at 1 */

    tm = time((time_t *) NULL);

    PrintPGNTags(f, &gameInfo);

    if(appData.numberTag && matchMode) fprintf(f, "[Number \"%d\"]\n", nextGame+1); // [HGM] number tag

    if (backwardMostMove > 0 || startedFromSetupPosition) {
        char *fen = PositionToFEN(backwardMostMove, NULL);
        fprintf(f, "[FEN \"%s\"]\n[SetUp \"1\"]\n", fen);
        fprintf(f, "\n{--------------\n");
        PrintPosition(f, backwardMostMove);
        fprintf(f, "--------------}\n");
        free(fen);
    }
    else {
        /* [AS] Out of book annotation */
        if( appData.saveOutOfBookInfo ) {
            char buf[64];

            GetOutOfBookInfo( buf );

            if( buf[0] != '\0' ) {
                fprintf( f, "[%s \"%s\"]\n", PGN_OUT_OF_BOOK, buf );
            }
        }

        fprintf(f, "\n");
    }

    i = backwardMostMove;
    linelen = 0;
    newblock = TRUE;

    while (i < forwardMostMove) {
        /* Print comments preceding this move */
        if (commentList[i] != NULL) {
            if (linelen > 0) fprintf(f, "\n");
            fprintf(f, "%s", commentList[i]);
            linelen = 0;
            newblock = TRUE;
        }

        /* Format move number */
        if ((i % 2) == 0)
          snprintf(numtext, sizeof(numtext)/sizeof(numtext[0]),"%d.", (i - offset)/2 + 1);
        else
          if (newblock)
            snprintf(numtext, sizeof(numtext)/sizeof(numtext[0]), "%d...", (i - offset)/2 + 1);
          else
            numtext[0] = NULLCHAR;

        numlen = strlen(numtext);
        newblock = FALSE;

        /* Print move number */
        blank = linelen > 0 && numlen > 0;
        if (linelen + (blank ? 1 : 0) + numlen > PGN_MAX_LINE) {
            fprintf(f, "\n");
            linelen = 0;
            blank = 0;
        }
        if (blank) {
            fprintf(f, " ");
            linelen++;
        }
        fprintf(f, "%s", numtext);
        linelen += numlen;

        /* Get move */
        safeStrCpy(move_buffer, SavePart(parseList[i]), sizeof(move_buffer)/sizeof(move_buffer[0])); // [HGM] pgn: print move via buffer, so it can be edited
        movelen = strlen(move_buffer); /* [HGM] pgn: line-break point before move */

        /* Print move */
        blank = linelen > 0 && movelen > 0;
        if (linelen + (blank ? 1 : 0) + movelen > PGN_MAX_LINE) {
            fprintf(f, "\n");
            linelen = 0;
            blank = 0;
        }
        if (blank) {
            fprintf(f, " ");
            linelen++;
        }
        fprintf(f, "%s", move_buffer);
        linelen += movelen;

        /* [AS] Add PV info if present */
        if( i >= 0 && appData.saveExtendedInfoInPGN && pvInfoList[i].depth > 0 ) {
            /* [HGM] add time */
            char buf[MSG_SIZ]; int seconds;

            seconds = (pvInfoList[i].time+5)/10; // deci-seconds, rounded to nearest

            if( seconds <= 0)
              buf[0] = 0;
            else
              if( seconds < 30 )
                snprintf(buf, MSG_SIZ, " %3.1f%c", seconds/10., 0);
              else
                {
                  seconds = (seconds + 4)/10; // round to full seconds
                  if( seconds < 60 )
                    snprintf(buf, MSG_SIZ, " %d%c", seconds, 0);
                  else
                    snprintf(buf, MSG_SIZ, " %d:%02d%c", seconds/60, seconds%60, 0);
                }

            snprintf( move_buffer, sizeof(move_buffer)/sizeof(move_buffer[0]),"{%s%.2f/%d%s}",
                      pvInfoList[i].score >= 0 ? "+" : "",
                      pvInfoList[i].score / 100.0,
                      pvInfoList[i].depth,
                      buf );

            movelen = strlen(move_buffer); /* [HGM] pgn: line-break point after move */

            /* Print score/depth */
            blank = linelen > 0 && movelen > 0;
            if (linelen + (blank ? 1 : 0) + movelen > PGN_MAX_LINE) {
                fprintf(f, "\n");
                linelen = 0;
                blank = 0;
            }
            if (blank) {
                fprintf(f, " ");
                linelen++;
            }
            fprintf(f, "%s", move_buffer);
            linelen += movelen;
        }

        i++;
    }

    /* Start a new line */
    if (linelen > 0) fprintf(f, "\n");

    /* Print comments after last move */
    if (commentList[i] != NULL) {
        fprintf(f, "%s\n", commentList[i]);
    }

    /* Print result */
    if (gameInfo.resultDetails != NULL &&
        gameInfo.resultDetails[0] != NULLCHAR) {
        fprintf(f, "{%s} %s\n\n", gameInfo.resultDetails,
                PGNResult(gameInfo.result));
    } else {
        fprintf(f, "%s\n\n", PGNResult(gameInfo.result));
    }

    fclose(f);
    lastSavedGame = GameCheckSum(); // [HGM] save: remember ID of last saved game to prevent double saving
    return TRUE;
}

/* Save game in old style and close the file */
int
SaveGameOldStyle (FILE *f)
{
    int i, offset;
    time_t tm;

    tm = time((time_t *) NULL);

    fprintf(f, "# %s game file -- %s", programName, ctime(&tm));
    PrintOpponents(f);

    if (backwardMostMove > 0 || startedFromSetupPosition) {
        fprintf(f, "\n[--------------\n");
        PrintPosition(f, backwardMostMove);
        fprintf(f, "--------------]\n");
    } else {
        fprintf(f, "\n");
    }

    i = backwardMostMove;
    offset = backwardMostMove & (~1L); /* output move numbers start at 1 */

    while (i < forwardMostMove) {
        if (commentList[i] != NULL) {
            fprintf(f, "[%s]\n", commentList[i]);
        }

        if ((i % 2) == 1) {
            fprintf(f, "%d. ...  %s\n", (i - offset)/2 + 1, parseList[i]);
            i++;
        } else {
            fprintf(f, "%d. %s  ", (i - offset)/2 + 1, parseList[i]);
            i++;
            if (commentList[i] != NULL) {
                fprintf(f, "\n");
                continue;
            }
            if (i >= forwardMostMove) {
                fprintf(f, "\n");
                break;
            }
            fprintf(f, "%s\n", parseList[i]);
            i++;
        }
    }

    if (commentList[i] != NULL) {
        fprintf(f, "[%s]\n", commentList[i]);
    }

    /* This isn't really the old style, but it's close enough */
    if (gameInfo.resultDetails != NULL &&
        gameInfo.resultDetails[0] != NULLCHAR) {
        fprintf(f, "%s (%s)\n\n", PGNResult(gameInfo.result),
                gameInfo.resultDetails);
    } else {
        fprintf(f, "%s\n\n", PGNResult(gameInfo.result));
    }

    fclose(f);
    return TRUE;
}

/* Save the current game to open file f and close the file */
int
SaveGame (FILE *f, int dummy, char *dummy2)
{
    if (gameMode == EditPosition) EditPositionDone(TRUE);
    lastSavedGame = GameCheckSum(); // [HGM] save: remember ID of last saved game to prevent double saving
    if (appData.oldSaveStyle)
      return SaveGameOldStyle(f);
    else
      return SaveGamePGN(f);
}

/* Save the current position to the given file */
int
SavePositionToFile (char *filename)
{
    FILE *f;
    char buf[MSG_SIZ];

    if (strcmp(filename, "-") == 0) {
        return SavePosition(stdout, 0, NULL);
    } else {
        f = fopen(filename, "a");
        if (f == NULL) {
            snprintf(buf, sizeof(buf), _("Can't open \"%s\""), filename);
            DisplayError(buf, errno);
            return FALSE;
        } else {
            safeStrCpy(buf, lastMsg, MSG_SIZ);
            DisplayMessage(_("Waiting for access to save file"), "");
            flock(fileno(f), LOCK_EX); // [HGM] lock
            DisplayMessage(_("Saving position"), "");
            lseek(fileno(f), 0, SEEK_END);     // better safe than sorry...
            SavePosition(f, 0, NULL);
            DisplayMessage(buf, "");
            return TRUE;
        }
    }
}

/* Save the current position to the given open file and close the file */
int
SavePosition (FILE *f, int dummy, char *dummy2)
{
    time_t tm;
    char *fen;

    if (gameMode == EditPosition) EditPositionDone(TRUE);
    if (appData.oldSaveStyle) {
        tm = time((time_t *) NULL);

        fprintf(f, "# %s position file -- %s", programName, ctime(&tm));
        PrintOpponents(f);
        fprintf(f, "[--------------\n");
        PrintPosition(f, currentMove);
        fprintf(f, "--------------]\n");
    } else {
        fen = PositionToFEN(currentMove, NULL);
        fprintf(f, "%s\n", fen);
        free(fen);
    }
    fclose(f);
    return TRUE;
}

void
ReloadCmailMsgEvent (int unregister)
{
#if !WIN32
    static char *inFilename = NULL;
    static char *outFilename;
    int i;
    struct stat inbuf, outbuf;
    int status;

    /* Any registered moves are unregistered if unregister is set, */
    /* i.e. invoked by the signal handler */
    if (unregister) {
        for (i = 0; i < CMAIL_MAX_GAMES; i ++) {
            cmailMoveRegistered[i] = FALSE;
            if (cmailCommentList[i] != NULL) {
                free(cmailCommentList[i]);
                cmailCommentList[i] = NULL;
            }
        }
        nCmailMovesRegistered = 0;
    }

    for (i = 0; i < CMAIL_MAX_GAMES; i ++) {
        cmailResult[i] = CMAIL_NOT_RESULT;
    }
    nCmailResults = 0;

    if (inFilename == NULL) {
        /* Because the filenames are static they only get malloced once  */
        /* and they never get freed                                      */
        inFilename = (char *) malloc(strlen(appData.cmailGameName) + 9);
        sprintf(inFilename, "%s.game.in", appData.cmailGameName);

        outFilename = (char *) malloc(strlen(appData.cmailGameName) + 5);
        sprintf(outFilename, "%s.out", appData.cmailGameName);
    }

    status = stat(outFilename, &outbuf);
    if (status < 0) {
        cmailMailedMove = FALSE;
    } else {
        status = stat(inFilename, &inbuf);
        cmailMailedMove = (inbuf.st_mtime < outbuf.st_mtime);
    }

    /* LoadGameFromFile(CMAIL_MAX_GAMES) with cmailMsgLoaded == TRUE
       counts the games, notes how each one terminated, etc.

       It would be nice to remove this kludge and instead gather all
       the information while building the game list.  (And to keep it
       in the game list nodes instead of having a bunch of fixed-size
       parallel arrays.)  Note this will require getting each game's
       termination from the PGN tags, as the game list builder does
       not process the game moves.  --mann
       */
    cmailMsgLoaded = TRUE;
    LoadGameFromFile(inFilename, CMAIL_MAX_GAMES, "", FALSE);

    /* Load first game in the file or popup game menu */
    LoadGameFromFile(inFilename, 0, appData.cmailGameName, TRUE);

#endif /* !WIN32 */
    return;
}

int
RegisterMove ()
{
    FILE *f;
    char string[MSG_SIZ];

    if (   cmailMailedMove
        || (cmailResult[lastLoadGameNumber - 1] == CMAIL_OLD_RESULT)) {
        return TRUE;            /* Allow free viewing  */
    }

    /* Unregister move to ensure that we don't leave RegisterMove        */
    /* with the move registered when the conditions for registering no   */
    /* longer hold                                                       */
    if (cmailMoveRegistered[lastLoadGameNumber - 1]) {
        cmailMoveRegistered[lastLoadGameNumber - 1] = FALSE;
        nCmailMovesRegistered --;

        if (cmailCommentList[lastLoadGameNumber - 1] != NULL)
          {
              free(cmailCommentList[lastLoadGameNumber - 1]);
              cmailCommentList[lastLoadGameNumber - 1] = NULL;
          }
    }

    if (cmailOldMove == -1) {
        DisplayError(_("You have edited the game history.\nUse Reload Same Game and make your move again."), 0);
        return FALSE;
    }

    if (currentMove > cmailOldMove + 1) {
        DisplayError(_("You have entered too many moves.\nBack up to the correct position and try again."), 0);
        return FALSE;
    }

    if (currentMove < cmailOldMove) {
        DisplayError(_("Displayed position is not current.\nStep forward to the correct position and try again."), 0);
        return FALSE;
    }

    if (forwardMostMove > currentMove) {
        /* Silently truncate extra moves */
        TruncateGame();
    }

    if (   (currentMove == cmailOldMove + 1)
        || (   (currentMove == cmailOldMove)
            && (   (cmailMoveType[lastLoadGameNumber - 1] == CMAIL_ACCEPT)
                || (cmailMoveType[lastLoadGameNumber - 1] == CMAIL_RESIGN)))) {
        if (gameInfo.result != GameUnfinished) {
            cmailResult[lastLoadGameNumber - 1] = CMAIL_NEW_RESULT;
        }

        if (commentList[currentMove] != NULL) {
            cmailCommentList[lastLoadGameNumber - 1]
              = StrSave(commentList[currentMove]);
        }
        safeStrCpy(cmailMove[lastLoadGameNumber - 1], moveList[currentMove - 1], sizeof(cmailMove[lastLoadGameNumber - 1])/sizeof(cmailMove[lastLoadGameNumber - 1][0]));

        if (appData.debugMode)
          fprintf(debugFP, "Saving %s for game %d\n",
                  cmailMove[lastLoadGameNumber - 1], lastLoadGameNumber);

        snprintf(string, MSG_SIZ, "%s.game.out.%d", appData.cmailGameName, lastLoadGameNumber);

        f = fopen(string, "w");
        if (appData.oldSaveStyle) {
            SaveGameOldStyle(f); /* also closes the file */

            snprintf(string, MSG_SIZ, "%s.pos.out", appData.cmailGameName);
            f = fopen(string, "w");
            SavePosition(f, 0, NULL); /* also closes the file */
        } else {
            fprintf(f, "{--------------\n");
            PrintPosition(f, currentMove);
            fprintf(f, "--------------}\n\n");

            SaveGame(f, 0, NULL); /* also closes the file*/
        }

        cmailMoveRegistered[lastLoadGameNumber - 1] = TRUE;
        nCmailMovesRegistered ++;
    } else if (nCmailGames == 1) {
        DisplayError(_("You have not made a move yet"), 0);
        return FALSE;
    }

    return TRUE;
}

void
MailMoveEvent ()
{
#if !WIN32
    static char *partCommandString = "cmail -xv%s -remail -game %s 2>&1";
    FILE *commandOutput;
    char buffer[MSG_SIZ], msg[MSG_SIZ], string[MSG_SIZ];
    int nBytes = 0;             /*  Suppress warnings on uninitialized variables    */
    int nBuffers;
    int i;
    int archived;
    char *arcDir;

    if (! cmailMsgLoaded) {
        DisplayError(_("The cmail message is not loaded.\nUse Reload CMail Message and make your move again."), 0);
        return;
    }

    if (nCmailGames == nCmailResults) {
        DisplayError(_("No unfinished games"), 0);
        return;
    }

#if CMAIL_PROHIBIT_REMAIL
    if (cmailMailedMove) {
      snprintf(msg, MSG_SIZ, _("You have already mailed a move.\nWait until a move arrives from your opponent.\nTo resend the same move, type\n\"cmail -remail -game %s\"\non the command line."), appData.cmailGameName);
        DisplayError(msg, 0);
        return;
    }
#endif

    if (! (cmailMailedMove || RegisterMove())) return;

    if (   cmailMailedMove
        || (nCmailMovesRegistered + nCmailResults == nCmailGames)) {
      snprintf(string, MSG_SIZ, partCommandString,
               appData.debugMode ? " -v" : "", appData.cmailGameName);
        commandOutput = popen(string, "r");

        if (commandOutput == NULL) {
            DisplayError(_("Failed to invoke cmail"), 0);
        } else {
            for (nBuffers = 0; (! feof(commandOutput)); nBuffers ++) {
                nBytes = fread(buffer, 1, MSG_SIZ - 1, commandOutput);
            }
            if (nBuffers > 1) {
                (void) memcpy(msg, buffer + nBytes, MSG_SIZ - nBytes - 1);
                (void) memcpy(msg + MSG_SIZ - nBytes - 1, buffer, nBytes);
                nBytes = MSG_SIZ - 1;
            } else {
                (void) memcpy(msg, buffer, nBytes);
            }
            *(msg + nBytes) = '\0'; /* \0 for end-of-string*/

            if(StrStr(msg, "Mailed cmail message to ") != NULL) {
                cmailMailedMove = TRUE; /* Prevent >1 moves    */

                archived = TRUE;
                for (i = 0; i < nCmailGames; i ++) {
                    if (cmailResult[i] == CMAIL_NOT_RESULT) {
                        archived = FALSE;
                    }
                }
                if (   archived
                    && (   (arcDir = (char *) getenv("CMAIL_ARCDIR"))
                        != NULL)) {
                  snprintf(buffer, MSG_SIZ, "%s/%s.%s.archive",
                           arcDir,
                           appData.cmailGameName,
                           gameInfo.date);
                    LoadGameFromFile(buffer, 1, buffer, FALSE);
                    cmailMsgLoaded = FALSE;
                }
            }

            DisplayInformation(msg);
            pclose(commandOutput);
        }
    } else {
        if ((*cmailMsg) != '\0') {
            DisplayInformation(cmailMsg);
        }
    }

    return;
#endif /* !WIN32 */
}

char *
CmailMsg ()
{
#if WIN32
    return NULL;
#else
    int  prependComma = 0;
    char number[5];
    char string[MSG_SIZ];       /* Space for game-list */
    int  i;

    if (!cmailMsgLoaded) return "";

    if (cmailMailedMove) {
      snprintf(cmailMsg, MSG_SIZ, _("Waiting for reply from opponent\n"));
    } else {
        /* Create a list of games left */
      snprintf(string, MSG_SIZ, "[");
        for (i = 0; i < nCmailGames; i ++) {
            if (! (   cmailMoveRegistered[i]
                   || (cmailResult[i] == CMAIL_OLD_RESULT))) {
                if (prependComma) {
                    snprintf(number, sizeof(number)/sizeof(number[0]), ",%d", i + 1);
                } else {
                    snprintf(number, sizeof(number)/sizeof(number[0]), "%d", i + 1);
                    prependComma = 1;
                }

                strcat(string, number);
            }
        }
        strcat(string, "]");

        if (nCmailMovesRegistered + nCmailResults == 0) {
            switch (nCmailGames) {
              case 1:
                snprintf(cmailMsg, MSG_SIZ, _("Still need to make move for game\n"));
                break;

              case 2:
                snprintf(cmailMsg, MSG_SIZ, _("Still need to make moves for both games\n"));
                break;

              default:
                snprintf(cmailMsg, MSG_SIZ, _("Still need to make moves for all %d games\n"),
                         nCmailGames);
                break;
            }
        } else {
            switch (nCmailGames - nCmailMovesRegistered - nCmailResults) {
              case 1:
                snprintf(cmailMsg, MSG_SIZ, _("Still need to make a move for game %s\n"),
                         string);
                break;

              case 0:
                if (nCmailResults == nCmailGames) {
                  snprintf(cmailMsg, MSG_SIZ, _("No unfinished games\n"));
                } else {
                  snprintf(cmailMsg, MSG_SIZ, _("Ready to send mail\n"));
                }
                break;

              default:
                snprintf(cmailMsg, MSG_SIZ, _("Still need to make moves for games %s\n"),
                         string);
            }
        }
    }
    return cmailMsg;
#endif /* WIN32 */
}

void
ResetGameEvent ()
{
    if (gameMode == Training)
      SetTrainingModeOff();

    Reset(TRUE, TRUE);
    cmailMsgLoaded = FALSE;
    if (appData.icsActive) {
      SendToICS(ics_prefix);
      SendToICS("refresh\n");
    }
}

void
ExitEvent (int status)
{
    exiting++;
    if (exiting > 2) {
      /* Give up on clean exit */
      exit(status);
    }
    if (exiting > 1) {
      /* Keep trying for clean exit */
      return;
    }

    if (appData.icsActive && appData.colorize) Colorize(ColorNone, FALSE);

    if (telnetISR != NULL) {
      RemoveInputSource(telnetISR);
    }
    if (icsPR != NoProc) {
      DestroyChildProcess(icsPR, TRUE);
    }

    /* [HGM] crash: leave writing PGN and position entirely to GameEnds() */
    GameEnds(gameInfo.result, gameInfo.resultDetails==NULL ? "xboard exit" : gameInfo.resultDetails, GE_PLAYER);

    /* [HGM] crash: the above GameEnds() is a dud if another one was running */
    /* make sure this other one finishes before killing it!                  */
    if(endingGame) { int count = 0;
        if(appData.debugMode) fprintf(debugFP, "ExitEvent() during GameEnds(), wait\n");
        while(endingGame && count++ < 10) DoSleep(1);
        if(appData.debugMode && endingGame) fprintf(debugFP, "GameEnds() seems stuck, proceed exiting\n");
    }

    /* Kill off chess programs */
    if (first.pr != NoProc) {
        ExitAnalyzeMode();

        DoSleep( appData.delayBeforeQuit );
        SendToProgram("quit\n", &first);
        DoSleep( appData.delayAfterQuit );
        DestroyChildProcess(first.pr, 10 /* [AS] first.useSigterm */ );
    }
    if (second.pr != NoProc) {
        DoSleep( appData.delayBeforeQuit );
        SendToProgram("quit\n", &second);
        DoSleep( appData.delayAfterQuit );
        DestroyChildProcess(second.pr, 10 /* [AS] second.useSigterm */ );
    }
    if (first.isr != NULL) {
        RemoveInputSource(first.isr);
    }
    if (second.isr != NULL) {
        RemoveInputSource(second.isr);
    }

    if (pairing.pr != NoProc) SendToProgram("quit\n", &pairing);
    if (pairing.isr != NULL) RemoveInputSource(pairing.isr);

    ShutDownFrontEnd();
    exit(status);
}

void
PauseEvent ()
{
    if (appData.debugMode)
        fprintf(debugFP, "PauseEvent(): pausing %d\n", pausing);
    if (pausing) {
        pausing = FALSE;
        ModeHighlight();
        if (gameMode == MachinePlaysWhite ||
            gameMode == MachinePlaysBlack) {
            StartClocks();
        } else {
            DisplayBothClocks();
        }
        if (gameMode == PlayFromGameFile) {
            if (appData.timeDelay >= 0)
                AutoPlayGameLoop();
        } else if (gameMode == IcsExamining && pauseExamInvalid) {
            Reset(FALSE, TRUE);
            SendToICS(ics_prefix);
            SendToICS("refresh\n");
        } else if (currentMove < forwardMostMove) {
            ForwardInner(forwardMostMove);
        }
        pauseExamInvalid = FALSE;
    } else {
        switch (gameMode) {
          default:
            return;
          case IcsExamining:
            pauseExamForwardMostMove = forwardMostMove;
            pauseExamInvalid = FALSE;
            /* fall through */
          case IcsObserving:
          case IcsPlayingWhite:
          case IcsPlayingBlack:
            pausing = TRUE;
            ModeHighlight();
            return;
          case PlayFromGameFile:
            (void) StopLoadGameTimer();
            pausing = TRUE;
            ModeHighlight();
            break;
          case BeginningOfGame:
            if (appData.icsActive) return;
            /* else fall through */
          case MachinePlaysWhite:
          case MachinePlaysBlack:
          case TwoMachinesPlay:
            if (forwardMostMove == 0)
              return;           /* don't pause if no one has moved */
            if ((gameMode == MachinePlaysWhite &&
                 !WhiteOnMove(forwardMostMove)) ||
                (gameMode == MachinePlaysBlack &&
                 WhiteOnMove(forwardMostMove))) {
                StopClocks();
            }
            pausing = TRUE;
            ModeHighlight();
            break;
        }
    }
}

void
EditCommentEvent ()
{
    char title[MSG_SIZ];

    if (currentMove < 1 || parseList[currentMove - 1][0] == NULLCHAR) {
      safeStrCpy(title, _("Edit comment"), sizeof(title)/sizeof(title[0]));
    } else {
      snprintf(title, MSG_SIZ, _("Edit comment on %d.%s%s"), (currentMove - 1) / 2 + 1,
               WhiteOnMove(currentMove - 1) ? " " : ".. ",
               parseList[currentMove - 1]);
    }

    EditCommentPopUp(currentMove, title, commentList[currentMove]);
}


void
EditTagsEvent ()
{
    char *tags = PGNTags(&gameInfo);
    bookUp = FALSE;
    EditTagsPopUp(tags, NULL);
    free(tags);
}

void
AnalyzeModeEvent ()
{
    if (appData.noChessProgram || gameMode == AnalyzeMode)
      return;

    if (gameMode != AnalyzeFile) {
        if (!appData.icsEngineAnalyze) {
               EditGameEvent();
               if (gameMode != EditGame) return;
        }
        ResurrectChessProgram();
        SendToProgram("analyze\n", &first);
        first.analyzing = TRUE;
        /*first.maybeThinking = TRUE;*/
        first.maybeThinking = FALSE; /* avoid killing GNU Chess */
        EngineOutputPopUp();
    }
    if (!appData.icsEngineAnalyze) gameMode = AnalyzeMode;
    pausing = FALSE;
    ModeHighlight();
    SetGameInfo();

    StartAnalysisClock();
    GetTimeMark(&lastNodeCountTime);
    lastNodeCount = 0;
}

void
AnalyzeFileEvent ()
{
    if (appData.noChessProgram || gameMode == AnalyzeFile)
      return;

    if (gameMode != AnalyzeMode) {
        EditGameEvent();
        if (gameMode != EditGame) return;
        ResurrectChessProgram();
        SendToProgram("analyze\n", &first);
        first.analyzing = TRUE;
        /*first.maybeThinking = TRUE;*/
        first.maybeThinking = FALSE; /* avoid killing GNU Chess */
        EngineOutputPopUp();
    }
    gameMode = AnalyzeFile;
    pausing = FALSE;
    ModeHighlight();
    SetGameInfo();

    StartAnalysisClock();
    GetTimeMark(&lastNodeCountTime);
    lastNodeCount = 0;
    if(appData.timeDelay > 0) StartLoadGameTimer((long)(1000.0 * appData.timeDelay));
}

void
MachineWhiteEvent ()
{
    char buf[MSG_SIZ];
    char *bookHit = NULL;

    if (appData.noChessProgram || (gameMode == MachinePlaysWhite))
      return;


    if (gameMode == PlayFromGameFile ||
        gameMode == TwoMachinesPlay  ||
        gameMode == Training         ||
        gameMode == AnalyzeMode      ||
        gameMode == EndOfGame)
        EditGameEvent();

    if (gameMode == EditPosition)
        EditPositionDone(TRUE);

    if (!WhiteOnMove(currentMove)) {
        DisplayError(_("It is not White's turn"), 0);
        return;
    }

    if (gameMode == AnalyzeMode || gameMode == AnalyzeFile)
      ExitAnalyzeMode();

    if (gameMode == EditGame || gameMode == AnalyzeMode ||
        gameMode == AnalyzeFile)
        TruncateGame();

    ResurrectChessProgram();    /* in case it isn't running */
    if(gameMode == BeginningOfGame) { /* [HGM] time odds: to get right odds in human mode */
        gameMode = MachinePlaysWhite;
        ResetClocks();
    } else
    gameMode = MachinePlaysWhite;
    pausing = FALSE;
    ModeHighlight();
    SetGameInfo();
    snprintf(buf, MSG_SIZ, "%s %s %s", gameInfo.white, _("vs."), gameInfo.black);
    DisplayTitle(buf);
    if (first.sendName) {
      snprintf(buf, MSG_SIZ, "name %s\n", gameInfo.black);
      SendToProgram(buf, &first);
    }
    if (first.sendTime) {
      if (first.useColors) {
        SendToProgram("black\n", &first); /*gnu kludge*/
      }
      SendTimeRemaining(&first, TRUE);
    }
    if (first.useColors) {
      SendToProgram("white\n", &first); // [HGM] book: send 'go' separately
    }
    bookHit = SendMoveToBookUser(forwardMostMove-1, &first, TRUE); // [HGM] book: send go or retrieve book move
    SetMachineThinkingEnables();
    first.maybeThinking = TRUE;
    StartClocks();
    firstMove = FALSE;

    if (appData.autoFlipView && !flipView) {
      flipView = !flipView;
      DrawPosition(FALSE, NULL);
      DisplayBothClocks();       // [HGM] logo: clocks might have to be exchanged;
    }

    if(bookHit) { // [HGM] book: simulate book reply
        static char bookMove[MSG_SIZ]; // a bit generous?

        programStats.nodes = programStats.depth = programStats.time =
        programStats.score = programStats.got_only_move = 0;
        sprintf(programStats.movelist, "%s (xbook)", bookHit);

        safeStrCpy(bookMove, "move ", sizeof(bookMove)/sizeof(bookMove[0]));
        strcat(bookMove, bookHit);
        HandleMachineMove(bookMove, &first);
    }
}

void
MachineBlackEvent ()
{
  char buf[MSG_SIZ];
  char *bookHit = NULL;

    if (appData.noChessProgram || (gameMode == MachinePlaysBlack))
        return;


    if (gameMode == PlayFromGameFile ||
        gameMode == TwoMachinesPlay  ||
        gameMode == Training         ||
        gameMode == AnalyzeMode      ||
        gameMode == EndOfGame)
        EditGameEvent();

    if (gameMode == EditPosition)
        EditPositionDone(TRUE);

    if (WhiteOnMove(currentMove)) {
        DisplayError(_("It is not Black's turn"), 0);
        return;
    }

    if (gameMode == AnalyzeMode || gameMode == AnalyzeFile)
      ExitAnalyzeMode();

    if (gameMode == EditGame || gameMode == AnalyzeMode ||
        gameMode == AnalyzeFile)
        TruncateGame();

    ResurrectChessProgram();    /* in case it isn't running */
    gameMode = MachinePlaysBlack;
    pausing = FALSE;
    ModeHighlight();
    SetGameInfo();
    snprintf(buf, MSG_SIZ, "%s %s %s", gameInfo.white, _("vs."), gameInfo.black);
    DisplayTitle(buf);
    if (first.sendName) {
      snprintf(buf, MSG_SIZ, "name %s\n", gameInfo.white);
      SendToProgram(buf, &first);
    }
    if (first.sendTime) {
      if (first.useColors) {
        SendToProgram("white\n", &first); /*gnu kludge*/
      }
      SendTimeRemaining(&first, FALSE);
    }
    if (first.useColors) {
      SendToProgram("black\n", &first); // [HGM] book: 'go' sent separately
    }
    bookHit = SendMoveToBookUser(forwardMostMove-1, &first, TRUE); // [HGM] book: send go or retrieve book move
    SetMachineThinkingEnables();
    first.maybeThinking = TRUE;
    StartClocks();

    if (appData.autoFlipView && flipView) {
      flipView = !flipView;
      DrawPosition(FALSE, NULL);
      DisplayBothClocks();       // [HGM] logo: clocks might have to be exchanged;
    }
    if(bookHit) { // [HGM] book: simulate book reply
        static char bookMove[MSG_SIZ]; // a bit generous?

        programStats.nodes = programStats.depth = programStats.time =
        programStats.score = programStats.got_only_move = 0;
        sprintf(programStats.movelist, "%s (xbook)", bookHit);

        safeStrCpy(bookMove, "move ", sizeof(bookMove)/sizeof(bookMove[0]));
        strcat(bookMove, bookHit);
        HandleMachineMove(bookMove, &first);
    }
}


void
DisplayTwoMachinesTitle ()
{
    char buf[MSG_SIZ];
    if (appData.matchGames > 0) {
        if(appData.tourneyFile[0]) {
          snprintf(buf, MSG_SIZ, "%s %s %s (%d/%d%s)",
                   gameInfo.white, _("vs."), gameInfo.black,
                   nextGame+1, appData.matchGames+1,
                   appData.tourneyType>0 ? "gt" : appData.tourneyType<0 ? "sw" : "rr");
        } else 
        if (first.twoMachinesColor[0] == 'w') {
          snprintf(buf, MSG_SIZ, "%s %s %s (%d-%d-%d)",
                   gameInfo.white, _("vs."),  gameInfo.black,
                   first.matchWins, second.matchWins,
                   matchGame - 1 - (first.matchWins + second.matchWins));
        } else {
          snprintf(buf, MSG_SIZ, "%s %s %s (%d-%d-%d)",
                   gameInfo.white, _("vs."), gameInfo.black,
                   second.matchWins, first.matchWins,
                   matchGame - 1 - (first.matchWins + second.matchWins));
        }
    } else {
      snprintf(buf, MSG_SIZ, "%s %s %s", gameInfo.white, _("vs."), gameInfo.black);
    }
    DisplayTitle(buf);
}

void
SettingsMenuIfReady ()
{
  if (second.lastPing != second.lastPong) {
    DisplayMessage("", _("Waiting for second chess program"));
    ScheduleDelayedEvent(SettingsMenuIfReady, 10); // [HGM] fast: lowered from 1000
    return;
  }
  ThawUI();
  DisplayMessage("", "");
  SettingsPopUp(&second);
}

int
WaitForEngine (ChessProgramState *cps, DelayedEventCallback retry)
{
    char buf[MSG_SIZ];
    if (cps->pr == NoProc) {
        StartChessProgram(cps);
        if (cps->protocolVersion == 1) {
          retry();
        } else {
          /* kludge: allow timeout for initial "feature" command */
          FreezeUI();
          snprintf(buf, MSG_SIZ, _("Starting %s chess program"), cps->which);
          DisplayMessage("", buf);
          ScheduleDelayedEvent(retry, FEATURE_TIMEOUT);
        }
        return 1;
    }
    return 0;
}

void
TwoMachinesEvent P((void))
{
    int i;
    char buf[MSG_SIZ];
    ChessProgramState *onmove;
    char *bookHit = NULL;
    static int stalling = 0;
    TimeMark now;
    long wait;

    if (appData.noChessProgram) return;

    switch (gameMode) {
      case TwoMachinesPlay:
        return;
      case MachinePlaysWhite:
      case MachinePlaysBlack:
        if (WhiteOnMove(forwardMostMove) == (gameMode == MachinePlaysWhite)) {
            DisplayError(_("Wait until your turn,\nor select Move Now"), 0);
            return;
        }
        /* fall through */
      case BeginningOfGame:
      case PlayFromGameFile:
      case EndOfGame:
        EditGameEvent();
        if (gameMode != EditGame) return;
        break;
      case EditPosition:
        EditPositionDone(TRUE);
        break;
      case AnalyzeMode:
      case AnalyzeFile:
        ExitAnalyzeMode();
        break;
      case EditGame:
      default:
        break;
    }

//    forwardMostMove = currentMove;
    TruncateGame(); // [HGM] vari: MachineWhite and MachineBlack do this...

    if(!ResurrectChessProgram()) return;   /* in case first program isn't running (unbalances its ping due to InitChessProgram!) */

    if(WaitForEngine(&second, TwoMachinesEventIfReady)) return; // (if needed:) started up second engine, so wait for features
    if(first.lastPing != first.lastPong) { // [HGM] wait till we are sure first engine has set up position
      ScheduleDelayedEvent(TwoMachinesEventIfReady, 10);
      return;
    }
    if(!stalling) {
      InitChessProgram(&second, FALSE); // unbalances ping of second engine
      SendToProgram("force\n", &second);
      stalling = 1;
      ScheduleDelayedEvent(TwoMachinesEventIfReady, 10);
      return;
    }
    GetTimeMark(&now); // [HGM] matchpause: implement match pause after engine load
    if(appData.matchPause>10000 || appData.matchPause<10)
                appData.matchPause = 10000; /* [HGM] make pause adjustable */
    wait = SubtractTimeMarks(&now, &pauseStart);
    if(wait < appData.matchPause) {
        ScheduleDelayedEvent(TwoMachinesEventIfReady, appData.matchPause - wait);
        return;
    }
    // we are now committed to starting the game
    stalling = 0;
    DisplayMessage("", "");
    if (startedFromSetupPosition) {
        SendBoard(&second, backwardMostMove);
    if (appData.debugMode) {
        fprintf(debugFP, "Two Machines\n");
    }
    }
    for (i = backwardMostMove; i < forwardMostMove; i++) {
        SendMoveToProgram(i, &second);
    }

    gameMode = TwoMachinesPlay;
    pausing = FALSE;
    ModeHighlight(); // [HGM] logo: this triggers display update of logos
    SetGameInfo();
    DisplayTwoMachinesTitle();
    firstMove = TRUE;
    if ((first.twoMachinesColor[0] == 'w') == WhiteOnMove(forwardMostMove)) {
        onmove = &first;
    } else {
        onmove = &second;
    }
    if(appData.debugMode) fprintf(debugFP, "New game (%d): %s-%s (%c)\n", matchGame, first.tidy, second.tidy, first.twoMachinesColor[0]);
    SendToProgram(first.computerString, &first);
    if (first.sendName) {
      snprintf(buf, MSG_SIZ, "name %s\n", second.tidy);
      SendToProgram(buf, &first);
    }
    SendToProgram(second.computerString, &second);
    if (second.sendName) {
      snprintf(buf, MSG_SIZ, "name %s\n", first.tidy);
      SendToProgram(buf, &second);
    }

    ResetClocks();
    if (!first.sendTime || !second.sendTime) {
        timeRemaining[0][forwardMostMove] = whiteTimeRemaining;
        timeRemaining[1][forwardMostMove] = blackTimeRemaining;
    }
    if (onmove->sendTime) {
      if (onmove->useColors) {
        SendToProgram(onmove->other->twoMachinesColor, onmove); /*gnu kludge*/
      }
      SendTimeRemaining(onmove, WhiteOnMove(forwardMostMove));
    }
    if (onmove->useColors) {
      SendToProgram(onmove->twoMachinesColor, onmove);
    }
    bookHit = SendMoveToBookUser(forwardMostMove-1, onmove, TRUE); // [HGM] book: send go or retrieve book move
//    SendToProgram("go\n", onmove);
    onmove->maybeThinking = TRUE;
    SetMachineThinkingEnables();

    StartClocks();

    if(bookHit) { // [HGM] book: simulate book reply
        static char bookMove[MSG_SIZ]; // a bit generous?

        programStats.nodes = programStats.depth = programStats.time =
        programStats.score = programStats.got_only_move = 0;
        sprintf(programStats.movelist, "%s (xbook)", bookHit);

        safeStrCpy(bookMove, "move ", sizeof(bookMove)/sizeof(bookMove[0]));
        strcat(bookMove, bookHit);
        savedMessage = bookMove; // args for deferred call
        savedState = onmove;
        ScheduleDelayedEvent(DeferredBookMove, 1);
    }
}

void
TrainingEvent ()
{
    if (gameMode == Training) {
      SetTrainingModeOff();
      gameMode = PlayFromGameFile;
      DisplayMessage("", _("Training mode off"));
    } else {
      gameMode = Training;
      animateTraining = appData.animate;

      /* make sure we are not already at the end of the game */
      if (currentMove < forwardMostMove) {
        SetTrainingModeOn();
        DisplayMessage("", _("Training mode on"));
      } else {
        gameMode = PlayFromGameFile;
        DisplayError(_("Already at end of game"), 0);
      }
    }
    ModeHighlight();
}

void
IcsClientEvent ()
{
    if (!appData.icsActive) return;
    switch (gameMode) {
      case IcsPlayingWhite:
      case IcsPlayingBlack:
      case IcsObserving:
      case IcsIdle:
      case BeginningOfGame:
      case IcsExamining:
        return;

      case EditGame:
        break;

      case EditPosition:
        EditPositionDone(TRUE);
        break;

      case AnalyzeMode:
      case AnalyzeFile:
        ExitAnalyzeMode();
        break;

      default:
        EditGameEvent();
        break;
    }

    gameMode = IcsIdle;
    ModeHighlight();
    return;
}

void
EditGameEvent ()
{
    int i;

    switch (gameMode) {
      case Training:
        SetTrainingModeOff();
        break;
      case MachinePlaysWhite:
      case MachinePlaysBlack:
      case BeginningOfGame:
        SendToProgram("force\n", &first);
        SetUserThinkingEnables();
        break;
      case PlayFromGameFile:
        (void) StopLoadGameTimer();
        if (gameFileFP != NULL) {
            gameFileFP = NULL;
        }
        break;
      case EditPosition:
        EditPositionDone(TRUE);
        break;
      case AnalyzeMode:
      case AnalyzeFile:
        ExitAnalyzeMode();
        SendToProgram("force\n", &first);
        break;
      case TwoMachinesPlay:
        GameEnds(EndOfFile, NULL, GE_PLAYER);
        ResurrectChessProgram();
        SetUserThinkingEnables();
        break;
      case EndOfGame:
        ResurrectChessProgram();
        break;
      case IcsPlayingBlack:
      case IcsPlayingWhite:
        DisplayError(_("Warning: You are still playing a game"), 0);
        break;
      case IcsObserving:
        DisplayError(_("Warning: You are still observing a game"), 0);
        break;
      case IcsExamining:
        DisplayError(_("Warning: You are still examining a game"), 0);
        break;
      case IcsIdle:
        break;
      case EditGame:
      default:
        return;
    }

    pausing = FALSE;
    StopClocks();
    first.offeredDraw = second.offeredDraw = 0;

    if (gameMode == PlayFromGameFile) {
        whiteTimeRemaining = timeRemaining[0][currentMove];
        blackTimeRemaining = timeRemaining[1][currentMove];
        DisplayTitle("");
    }

    if (gameMode == MachinePlaysWhite ||
        gameMode == MachinePlaysBlack ||
        gameMode == TwoMachinesPlay ||
        gameMode == EndOfGame) {
        i = forwardMostMove;
        while (i > currentMove) {
            SendToProgram("undo\n", &first);
            i--;
        }
        if(!adjustedClock) {
        whiteTimeRemaining = timeRemaining[0][currentMove];
        blackTimeRemaining = timeRemaining[1][currentMove];
        DisplayBothClocks();
        }
        if (whiteFlag || blackFlag) {
            whiteFlag = blackFlag = 0;
        }
        DisplayTitle("");
    }

    gameMode = EditGame;
    ModeHighlight();
    SetGameInfo();
}


void
EditPositionEvent ()
{
    if (gameMode == EditPosition) {
        EditGameEvent();
        return;
    }

    EditGameEvent();
    if (gameMode != EditGame) return;

    gameMode = EditPosition;
    ModeHighlight();
    SetGameInfo();
    if (currentMove > 0)
      CopyBoard(boards[0], boards[currentMove]);

    blackPlaysFirst = !WhiteOnMove(currentMove);
    ResetClocks();
    currentMove = forwardMostMove = backwardMostMove = 0;
    HistorySet(parseList, backwardMostMove, forwardMostMove, currentMove-1);
    DisplayMove(-1);
}

void
ExitAnalyzeMode ()
{
    /* [DM] icsEngineAnalyze - possible call from other functions */
    if (appData.icsEngineAnalyze) {
        appData.icsEngineAnalyze = FALSE;

        DisplayMessage("",_("Close ICS engine analyze..."));
    }
    if (first.analysisSupport && first.analyzing) {
      SendToProgram("exit\n", &first);
      first.analyzing = FALSE;
    }
    thinkOutput[0] = NULLCHAR;
}

void
EditPositionDone (Boolean fakeRights)
{
    int king = gameInfo.variant == VariantKnightmate ? WhiteUnicorn : WhiteKing;

    startedFromSetupPosition = TRUE;
    InitChessProgram(&first, FALSE);
    if(fakeRights) { // [HGM] suppress this if we just pasted a FEN.
      boards[0][EP_STATUS] = EP_NONE;
      boards[0][CASTLING][2] = boards[0][CASTLING][5] = BOARD_WIDTH>>1;
    if(boards[0][0][BOARD_WIDTH>>1] == king) {
        boards[0][CASTLING][1] = boards[0][0][BOARD_LEFT] == WhiteRook ? 0 : NoRights;
        boards[0][CASTLING][0] = boards[0][0][BOARD_RGHT-1] == WhiteRook ? BOARD_RGHT-1 : NoRights;
      } else boards[0][CASTLING][2] = NoRights;
    if(boards[0][BOARD_HEIGHT-1][BOARD_WIDTH>>1] == WHITE_TO_BLACK king) {
        boards[0][CASTLING][4] = boards[0][BOARD_HEIGHT-1][BOARD_LEFT] == BlackRook ? 0 : NoRights;
        boards[0][CASTLING][3] = boards[0][BOARD_HEIGHT-1][BOARD_RGHT-1] == BlackRook ? BOARD_RGHT-1 : NoRights;
      } else boards[0][CASTLING][5] = NoRights;
    }
    SendToProgram("force\n", &first);
    if (blackPlaysFirst) {
        safeStrCpy(moveList[0], "", sizeof(moveList[0])/sizeof(moveList[0][0]));
        safeStrCpy(parseList[0], "", sizeof(parseList[0])/sizeof(parseList[0][0]));
        currentMove = forwardMostMove = backwardMostMove = 1;
        CopyBoard(boards[1], boards[0]);
    } else {
        currentMove = forwardMostMove = backwardMostMove = 0;
    }
    SendBoard(&first, forwardMostMove);
    if (appData.debugMode) {
        fprintf(debugFP, "EditPosDone\n");
    }
    DisplayTitle("");
    timeRemaining[0][forwardMostMove] = whiteTimeRemaining;
    timeRemaining[1][forwardMostMove] = blackTimeRemaining;
    gameMode = EditGame;
    ModeHighlight();
    HistorySet(parseList, backwardMostMove, forwardMostMove, currentMove-1);
    ClearHighlights(); /* [AS] */
}

/* Pause for `ms' milliseconds */
/* !! Ugh, this is a kludge. Fix it sometime. --tpm */
void
TimeDelay (long ms)
{
    TimeMark m1, m2;

    GetTimeMark(&m1);
    do {
        GetTimeMark(&m2);
    } while (SubtractTimeMarks(&m2, &m1) < ms);
}

/* !! Ugh, this is a kludge. Fix it sometime. --tpm */
void
SendMultiLineToICS (char *buf)
{
    char temp[MSG_SIZ+1], *p;
    int len;

    len = strlen(buf);
    if (len > MSG_SIZ)
      len = MSG_SIZ;

    strncpy(temp, buf, len);
    temp[len] = 0;

    p = temp;
    while (*p) {
        if (*p == '\n' || *p == '\r')
          *p = ' ';
        ++p;
    }

    strcat(temp, "\n");
    SendToICS(temp);
    SendToPlayer(temp, strlen(temp));
}

void
SetWhiteToPlayEvent ()
{
    if (gameMode == EditPosition) {
        blackPlaysFirst = FALSE;
        DisplayBothClocks();    /* works because currentMove is 0 */
    } else if (gameMode == IcsExamining) {
        SendToICS(ics_prefix);
        SendToICS("tomove white\n");
    }
}

void
SetBlackToPlayEvent ()
{
    if (gameMode == EditPosition) {
        blackPlaysFirst = TRUE;
        currentMove = 1;        /* kludge */
        DisplayBothClocks();
        currentMove = 0;
    } else if (gameMode == IcsExamining) {
        SendToICS(ics_prefix);
        SendToICS("tomove black\n");
    }
}

void
EditPositionMenuEvent (ChessSquare selection, int x, int y)
{
    char buf[MSG_SIZ];
    ChessSquare piece = boards[0][y][x];

    if (gameMode != EditPosition && gameMode != IcsExamining) return;

    switch (selection) {
      case ClearBoard:
        if (gameMode == IcsExamining && ics_type == ICS_FICS) {
            SendToICS(ics_prefix);
            SendToICS("bsetup clear\n");
        } else if (gameMode == IcsExamining && ics_type == ICS_ICC) {
            SendToICS(ics_prefix);
            SendToICS("clearboard\n");
        } else {
            for (x = 0; x < BOARD_WIDTH; x++) { ChessSquare p = EmptySquare;
                if(x == BOARD_LEFT-1 || x == BOARD_RGHT) p = (ChessSquare) 0; /* [HGM] holdings */
                for (y = 0; y < BOARD_HEIGHT; y++) {
                    if (gameMode == IcsExamining) {
                        if (boards[currentMove][y][x] != EmptySquare) {
                          snprintf(buf, MSG_SIZ, "%sx@%c%c\n", ics_prefix,
                                    AAA + x, ONE + y);
                            SendToICS(buf);
                        }
                    } else {
                        boards[0][y][x] = p;
                    }
                }
            }
        }
        if (gameMode == EditPosition) {
            DrawPosition(FALSE, boards[0]);
        }
        break;

      case WhitePlay:
        SetWhiteToPlayEvent();
        break;

      case BlackPlay:
        SetBlackToPlayEvent();
        break;

      case EmptySquare:
        if (gameMode == IcsExamining) {
            if (x < BOARD_LEFT || x >= BOARD_RGHT) break; // [HGM] holdings
            snprintf(buf, MSG_SIZ, "%sx@%c%c\n", ics_prefix, AAA + x, ONE + y);
            SendToICS(buf);
        } else {
            if(x < BOARD_LEFT || x >= BOARD_RGHT) {
                if(x == BOARD_LEFT-2) {
                    if(y < BOARD_HEIGHT-1-gameInfo.holdingsSize) break;
                    boards[0][y][1] = 0;
                } else
                if(x == BOARD_RGHT+1) {
                    if(y >= gameInfo.holdingsSize) break;
                    boards[0][y][BOARD_WIDTH-2] = 0;
                } else break;
            }
            boards[0][y][x] = EmptySquare;
            DrawPosition(FALSE, boards[0]);
        }
        break;

      case PromotePiece:
        if(piece >= (int)WhitePawn && piece < (int)WhiteMan ||
           piece >= (int)BlackPawn && piece < (int)BlackMan   ) {
            selection = (ChessSquare) (PROMOTED piece);
        } else if(piece == EmptySquare) selection = WhiteSilver;
        else selection = (ChessSquare)((int)piece - 1);
        goto defaultlabel;

      case DemotePiece:
        if(piece > (int)WhiteMan && piece <= (int)WhiteKing ||
           piece > (int)BlackMan && piece <= (int)BlackKing   ) {
            selection = (ChessSquare) (DEMOTED piece);
        } else if(piece == EmptySquare) selection = BlackSilver;
        else selection = (ChessSquare)((int)piece + 1);
        goto defaultlabel;

      case WhiteQueen:
      case BlackQueen:
        if(gameInfo.variant == VariantShatranj ||
           gameInfo.variant == VariantXiangqi  ||
           gameInfo.variant == VariantCourier  ||
           gameInfo.variant == VariantMakruk     )
            selection = (ChessSquare)((int)selection - (int)WhiteQueen + (int)WhiteFerz);
        goto defaultlabel;

      case WhiteKing:
      case BlackKing:
        if(gameInfo.variant == VariantXiangqi)
            selection = (ChessSquare)((int)selection - (int)WhiteKing + (int)WhiteWazir);
        if(gameInfo.variant == VariantKnightmate)
            selection = (ChessSquare)((int)selection - (int)WhiteKing + (int)WhiteUnicorn);
      default:
        defaultlabel:
        if (gameMode == IcsExamining) {
            if (x < BOARD_LEFT || x >= BOARD_RGHT) break; // [HGM] holdings
            snprintf(buf, MSG_SIZ, "%s%c@%c%c\n", ics_prefix,
                     PieceToChar(selection), AAA + x, ONE + y);
            SendToICS(buf);
        } else {
            if(x < BOARD_LEFT || x >= BOARD_RGHT) {
                int n;
                if(x == BOARD_LEFT-2 && selection >= BlackPawn) {
                    n = PieceToNumber(selection - BlackPawn);
                    if(n >= gameInfo.holdingsSize) { n = 0; selection = BlackPawn; }
                    boards[0][BOARD_HEIGHT-1-n][0] = selection;
                    boards[0][BOARD_HEIGHT-1-n][1]++;
                } else
                if(x == BOARD_RGHT+1 && selection < BlackPawn) {
                    n = PieceToNumber(selection);
                    if(n >= gameInfo.holdingsSize) { n = 0; selection = WhitePawn; }
                    boards[0][n][BOARD_WIDTH-1] = selection;
                    boards[0][n][BOARD_WIDTH-2]++;
                }
            } else
            boards[0][y][x] = selection;
            DrawPosition(TRUE, boards[0]);
            ClearHighlights();
            fromX = fromY = -1;
        }
        break;
    }
}


void
DropMenuEvent (ChessSquare selection, int x, int y)
{
    ChessMove moveType;

    switch (gameMode) {
      case IcsPlayingWhite:
      case MachinePlaysBlack:
        if (!WhiteOnMove(currentMove)) {
            DisplayMoveError(_("It is Black's turn"));
            return;
        }
        moveType = WhiteDrop;
        break;
      case IcsPlayingBlack:
      case MachinePlaysWhite:
        if (WhiteOnMove(currentMove)) {
            DisplayMoveError(_("It is White's turn"));
            return;
        }
        moveType = BlackDrop;
        break;
      case EditGame:
        moveType = WhiteOnMove(currentMove) ? WhiteDrop : BlackDrop;
        break;
      default:
        return;
    }

    if (moveType == BlackDrop && selection < BlackPawn) {
      selection = (ChessSquare) ((int) selection
                                 + (int) BlackPawn - (int) WhitePawn);
    }
    if (boards[currentMove][y][x] != EmptySquare) {
        DisplayMoveError(_("That square is occupied"));
        return;
    }

    FinishMove(moveType, (int) selection, DROP_RANK, x, y, NULLCHAR);
}

void
AcceptEvent ()
{
    /* Accept a pending offer of any kind from opponent */

    if (appData.icsActive) {
        SendToICS(ics_prefix);
        SendToICS("accept\n");
    } else if (cmailMsgLoaded) {
        if (currentMove == cmailOldMove &&
            commentList[cmailOldMove] != NULL &&
            StrStr(commentList[cmailOldMove], WhiteOnMove(cmailOldMove) ?
                   "Black offers a draw" : "White offers a draw")) {
            TruncateGame();
            GameEnds(GameIsDrawn, "Draw agreed", GE_PLAYER);
            cmailMoveType[lastLoadGameNumber - 1] = CMAIL_ACCEPT;
        } else {
            DisplayError(_("There is no pending offer on this move"), 0);
            cmailMoveType[lastLoadGameNumber - 1] = CMAIL_MOVE;
        }
    } else {
        /* Not used for offers from chess program */
    }
}

void
DeclineEvent ()
{
    /* Decline a pending offer of any kind from opponent */

    if (appData.icsActive) {
        SendToICS(ics_prefix);
        SendToICS("decline\n");
    } else if (cmailMsgLoaded) {
        if (currentMove == cmailOldMove &&
            commentList[cmailOldMove] != NULL &&
            StrStr(commentList[cmailOldMove], WhiteOnMove(cmailOldMove) ?
                   "Black offers a draw" : "White offers a draw")) {
#ifdef NOTDEF
            AppendComment(cmailOldMove, "Draw declined", TRUE);
            DisplayComment(cmailOldMove - 1, "Draw declined");
#endif /*NOTDEF*/
        } else {
            DisplayError(_("There is no pending offer on this move"), 0);
        }
    } else {
        /* Not used for offers from chess program */
    }
}

void
RematchEvent ()
{
    /* Issue ICS rematch command */
    if (appData.icsActive) {
        SendToICS(ics_prefix);
        SendToICS("rematch\n");
    }
}

void
CallFlagEvent ()
{
    /* Call your opponent's flag (claim a win on time) */
    if (appData.icsActive) {
        SendToICS(ics_prefix);
        SendToICS("flag\n");
    } else {
        switch (gameMode) {
          default:
            return;
          case MachinePlaysWhite:
            if (whiteFlag) {
                if (blackFlag)
                  GameEnds(GameIsDrawn, "Both players ran out of time",
                           GE_PLAYER);
                else
                  GameEnds(BlackWins, "Black wins on time", GE_PLAYER);
            } else {
                DisplayError(_("Your opponent is not out of time"), 0);
            }
            break;
          case MachinePlaysBlack:
            if (blackFlag) {
                if (whiteFlag)
                  GameEnds(GameIsDrawn, "Both players ran out of time",
                           GE_PLAYER);
                else
                  GameEnds(WhiteWins, "White wins on time", GE_PLAYER);
            } else {
                DisplayError(_("Your opponent is not out of time"), 0);
            }
            break;
        }
    }
}

void
ClockClick (int which)
{       // [HGM] code moved to back-end from winboard.c
        if(which) { // black clock
          if (gameMode == EditPosition || gameMode == IcsExamining) {
            if(!appData.pieceMenu && blackPlaysFirst) EditPositionMenuEvent(ClearBoard, 0, 0);
            SetBlackToPlayEvent();
          } else if ((gameMode == AnalyzeMode || gameMode == EditGame) && !blackFlag && WhiteOnMove(currentMove)) {
          UserMoveEvent((int)EmptySquare, DROP_RANK, 0, 0, 0); // [HGM] multi-move: if not out of time, enters null move
          } else if (shiftKey) {
            AdjustClock(which, -1);
          } else if (gameMode == IcsPlayingWhite ||
                     gameMode == MachinePlaysBlack) {
            CallFlagEvent();
          }
        } else { // white clock
          if (gameMode == EditPosition || gameMode == IcsExamining) {
            if(!appData.pieceMenu && !blackPlaysFirst) EditPositionMenuEvent(ClearBoard, 0, 0);
            SetWhiteToPlayEvent();
          } else if ((gameMode == AnalyzeMode || gameMode == EditGame) && !whiteFlag && !WhiteOnMove(currentMove)) {
          UserMoveEvent((int)EmptySquare, DROP_RANK, 0, 0, 0); // [HGM] multi-move
          } else if (shiftKey) {
            AdjustClock(which, -1);
          } else if (gameMode == IcsPlayingBlack ||
                   gameMode == MachinePlaysWhite) {
            CallFlagEvent();
          }
        }
}

void
DrawEvent ()
{
    /* Offer draw or accept pending draw offer from opponent */

    if (appData.icsActive) {
        /* Note: tournament rules require draw offers to be
           made after you make your move but before you punch
           your clock.  Currently ICS doesn't let you do that;
           instead, you immediately punch your clock after making
           a move, but you can offer a draw at any time. */

        SendToICS(ics_prefix);
        SendToICS("draw\n");
        userOfferedDraw = TRUE; // [HGM] drawclaim: also set flag in ICS play
    } else if (cmailMsgLoaded) {
        if (currentMove == cmailOldMove &&
            commentList[cmailOldMove] != NULL &&
            StrStr(commentList[cmailOldMove], WhiteOnMove(cmailOldMove) ?
                   "Black offers a draw" : "White offers a draw")) {
            GameEnds(GameIsDrawn, "Draw agreed", GE_PLAYER);
            cmailMoveType[lastLoadGameNumber - 1] = CMAIL_ACCEPT;
        } else if (currentMove == cmailOldMove + 1) {
            char *offer = WhiteOnMove(cmailOldMove) ?
              "White offers a draw" : "Black offers a draw";
            AppendComment(currentMove, offer, TRUE);
            DisplayComment(currentMove - 1, offer);
            cmailMoveType[lastLoadGameNumber - 1] = CMAIL_DRAW;
        } else {
            DisplayError(_("You must make your move before offering a draw"), 0);
            cmailMoveType[lastLoadGameNumber - 1] = CMAIL_MOVE;
        }
    } else if (first.offeredDraw) {
        GameEnds(GameIsDrawn, "Draw agreed", GE_XBOARD);
    } else {
        if (first.sendDrawOffers) {
            SendToProgram("draw\n", &first);
            userOfferedDraw = TRUE;
        }
    }
}

void
AdjournEvent ()
{
    /* Offer Adjourn or accept pending Adjourn offer from opponent */

    if (appData.icsActive) {
        SendToICS(ics_prefix);
        SendToICS("adjourn\n");
    } else {
        /* Currently GNU Chess doesn't offer or accept Adjourns */
    }
}


void
AbortEvent ()
{
    /* Offer Abort or accept pending Abort offer from opponent */

    if (appData.icsActive) {
        SendToICS(ics_prefix);
        SendToICS("abort\n");
    } else {
        GameEnds(GameUnfinished, "Game aborted", GE_PLAYER);
    }
}

void
ResignEvent ()
{
    /* Resign.  You can do this even if it's not your turn. */

    if (appData.icsActive) {
        SendToICS(ics_prefix);
        SendToICS("resign\n");
    } else {
        switch (gameMode) {
          case MachinePlaysWhite:
            GameEnds(WhiteWins, "Black resigns", GE_PLAYER);
            break;
          case MachinePlaysBlack:
            GameEnds(BlackWins, "White resigns", GE_PLAYER);
            break;
          case EditGame:
            if (cmailMsgLoaded) {
                TruncateGame();
                if (WhiteOnMove(cmailOldMove)) {
                    GameEnds(BlackWins, "White resigns", GE_PLAYER);
                } else {
                    GameEnds(WhiteWins, "Black resigns", GE_PLAYER);
                }
                cmailMoveType[lastLoadGameNumber - 1] = CMAIL_RESIGN;
            }
            break;
          default:
            break;
        }
    }
}


void
StopObservingEvent ()
{
    /* Stop observing current games */
    SendToICS(ics_prefix);
    SendToICS("unobserve\n");
}

void
StopExaminingEvent ()
{
    /* Stop observing current game */
    SendToICS(ics_prefix);
    SendToICS("unexamine\n");
}

void
ForwardInner (int target)
{
    int limit; int oldSeekGraphUp = seekGraphUp;

    if (appData.debugMode)
        fprintf(debugFP, "ForwardInner(%d), current %d, forward %d\n",
                target, currentMove, forwardMostMove);

    if (gameMode == EditPosition)
      return;

    seekGraphUp = FALSE;
    MarkTargetSquares(1);

    if (gameMode == PlayFromGameFile && !pausing)
      PauseEvent();

    if (gameMode == IcsExamining && pausing)
      limit = pauseExamForwardMostMove;
    else
      limit = forwardMostMove;

    if (target > limit) target = limit;

    if (target > 0 && moveList[target - 1][0]) {
        int fromX, fromY, toX, toY;
        toX = moveList[target - 1][2] - AAA;
        toY = moveList[target - 1][3] - ONE;
        if (moveList[target - 1][1] == '@') {
            if (appData.highlightLastMove) {
                SetHighlights(-1, -1, toX, toY);
            }
        } else {
            fromX = moveList[target - 1][0] - AAA;
            fromY = moveList[target - 1][1] - ONE;
            if (target == currentMove + 1) {
                AnimateMove(boards[currentMove], fromX, fromY, toX, toY);
            }
            if (appData.highlightLastMove) {
                SetHighlights(fromX, fromY, toX, toY);
            }
        }
    }
    if (gameMode == EditGame || gameMode == AnalyzeMode ||
        gameMode == Training || gameMode == PlayFromGameFile ||
        gameMode == AnalyzeFile) {
        while (currentMove < target) {
            SendMoveToProgram(currentMove++, &first);
        }
    } else {
        currentMove = target;
    }

    if (gameMode == EditGame || gameMode == EndOfGame) {
        whiteTimeRemaining = timeRemaining[0][currentMove];
        blackTimeRemaining = timeRemaining[1][currentMove];
    }
    DisplayBothClocks();
    DisplayMove(currentMove - 1);
    DrawPosition(oldSeekGraphUp, boards[currentMove]);
    HistorySet(parseList,backwardMostMove,forwardMostMove,currentMove-1);
    if ( !matchMode && gameMode != Training) { // [HGM] PV info: routine tests if empty
        DisplayComment(currentMove - 1, commentList[currentMove]);
    }
}


void
ForwardEvent ()
{
    if (gameMode == IcsExamining && !pausing) {
        SendToICS(ics_prefix);
        SendToICS("forward\n");
    } else {
        ForwardInner(currentMove + 1);
    }
}

void
ToEndEvent ()
{
    if (gameMode == AnalyzeMode || gameMode == AnalyzeFile) {
        /* to optimze, we temporarily turn off analysis mode while we feed
         * the remaining moves to the engine. Otherwise we get analysis output
         * after each move.
         */
        if (first.analysisSupport) {
          SendToProgram("exit\nforce\n", &first);
          first.analyzing = FALSE;
        }
    }

    if (gameMode == IcsExamining && !pausing) {
        SendToICS(ics_prefix);
        SendToICS("forward 999999\n");
    } else {
        ForwardInner(forwardMostMove);
    }

    if (gameMode == AnalyzeMode || gameMode == AnalyzeFile) {
        /* we have fed all the moves, so reactivate analysis mode */
        SendToProgram("analyze\n", &first);
        first.analyzing = TRUE;
        /*first.maybeThinking = TRUE;*/
        first.maybeThinking = FALSE; /* avoid killing GNU Chess */
    }
}

void
BackwardInner (int target)
{
    int full_redraw = TRUE; /* [AS] Was FALSE, had to change it! */

    if (appData.debugMode)
        fprintf(debugFP, "BackwardInner(%d), current %d, forward %d\n",
                target, currentMove, forwardMostMove);

    if (gameMode == EditPosition) return;
    seekGraphUp = FALSE;
    MarkTargetSquares(1);
    if (currentMove <= backwardMostMove) {
        ClearHighlights();
        DrawPosition(full_redraw, boards[currentMove]);
        return;
    }
    if (gameMode == PlayFromGameFile && !pausing)
      PauseEvent();

    if (moveList[target][0]) {
        int fromX, fromY, toX, toY;
        toX = moveList[target][2] - AAA;
        toY = moveList[target][3] - ONE;
        if (moveList[target][1] == '@') {
            if (appData.highlightLastMove) {
                SetHighlights(-1, -1, toX, toY);
            }
        } else {
            fromX = moveList[target][0] - AAA;
            fromY = moveList[target][1] - ONE;
            if (target == currentMove - 1) {
                AnimateMove(boards[currentMove], toX, toY, fromX, fromY);
            }
            if (appData.highlightLastMove) {
                SetHighlights(fromX, fromY, toX, toY);
            }
        }
    }
    if (gameMode == EditGame || gameMode==AnalyzeMode ||
        gameMode == PlayFromGameFile || gameMode == AnalyzeFile) {
        while (currentMove > target) {
            if(moveList[currentMove-1][1] == '@' && moveList[currentMove-1][0] == '@') {
                // null move cannot be undone. Reload program with move history before it.
                int i;
                for(i=target; i>backwardMostMove; i--) { // seek back to start or previous null move
                    if(moveList[i-1][1] == '@' && moveList[i-1][0] == '@') break;
                }
                SendBoard(&first, i); 
                for(currentMove=i; currentMove<target; currentMove++) SendMoveToProgram(currentMove, &first);
                break;
            }
            SendToProgram("undo\n", &first);
            currentMove--;
        }
    } else {
        currentMove = target;
    }

    if (gameMode == EditGame || gameMode == EndOfGame) {
        whiteTimeRemaining = timeRemaining[0][currentMove];
        blackTimeRemaining = timeRemaining[1][currentMove];
    }
    DisplayBothClocks();
    DisplayMove(currentMove - 1);
    DrawPosition(full_redraw, boards[currentMove]);
    HistorySet(parseList,backwardMostMove,forwardMostMove,currentMove-1);
    // [HGM] PV info: routine tests if comment empty
    DisplayComment(currentMove - 1, commentList[currentMove]);
}

void
BackwardEvent ()
{
    if (gameMode == IcsExamining && !pausing) {
        SendToICS(ics_prefix);
        SendToICS("backward\n");
    } else {
        BackwardInner(currentMove - 1);
    }
}

void
ToStartEvent ()
{
    if (gameMode == AnalyzeMode || gameMode == AnalyzeFile) {
        /* to optimize, we temporarily turn off analysis mode while we undo
         * all the moves. Otherwise we get analysis output after each undo.
         */
        if (first.analysisSupport) {
          SendToProgram("exit\nforce\n", &first);
          first.analyzing = FALSE;
        }
    }

    if (gameMode == IcsExamining && !pausing) {
        SendToICS(ics_prefix);
        SendToICS("backward 999999\n");
    } else {
        BackwardInner(backwardMostMove);
    }

    if (gameMode == AnalyzeMode || gameMode == AnalyzeFile) {
        /* we have fed all the moves, so reactivate analysis mode */
        SendToProgram("analyze\n", &first);
        first.analyzing = TRUE;
        /*first.maybeThinking = TRUE;*/
        first.maybeThinking = FALSE; /* avoid killing GNU Chess */
    }
}

void
ToNrEvent (int to)
{
  if (gameMode == PlayFromGameFile && !pausing) PauseEvent();
  if (to >= forwardMostMove) to = forwardMostMove;
  if (to <= backwardMostMove) to = backwardMostMove;
  if (to < currentMove) {
    BackwardInner(to);
  } else {
    ForwardInner(to);
  }
}

void
RevertEvent (Boolean annotate)
{
    if(PopTail(annotate)) { // [HGM] vari: restore old game tail
        return;
    }
    if (gameMode != IcsExamining) {
        DisplayError(_("You are not examining a game"), 0);
        return;
    }
    if (pausing) {
        DisplayError(_("You can't revert while pausing"), 0);
        return;
    }
    SendToICS(ics_prefix);
    SendToICS("revert\n");
}

void
RetractMoveEvent ()
{
    switch (gameMode) {
      case MachinePlaysWhite:
      case MachinePlaysBlack:
        if (WhiteOnMove(forwardMostMove) == (gameMode == MachinePlaysWhite)) {
            DisplayError(_("Wait until your turn,\nor select Move Now"), 0);
            return;
        }
        if (forwardMostMove < 2) return;
        currentMove = forwardMostMove = forwardMostMove - 2;
        whiteTimeRemaining = timeRemaining[0][currentMove];
        blackTimeRemaining = timeRemaining[1][currentMove];
        DisplayBothClocks();
        DisplayMove(currentMove - 1);
        ClearHighlights();/*!! could figure this out*/
        DrawPosition(TRUE, boards[currentMove]); /* [AS] Changed to full redraw! */
        SendToProgram("remove\n", &first);
        /*first.maybeThinking = TRUE;*/ /* GNU Chess does not ponder here */
        break;

      case BeginningOfGame:
      default:
        break;

      case IcsPlayingWhite:
      case IcsPlayingBlack:
        if (WhiteOnMove(forwardMostMove) == (gameMode == IcsPlayingWhite)) {
            SendToICS(ics_prefix);
            SendToICS("takeback 2\n");
        } else {
            SendToICS(ics_prefix);
            SendToICS("takeback 1\n");
        }
        break;
    }
}

void
MoveNowEvent ()
{
    ChessProgramState *cps;

    switch (gameMode) {
      case MachinePlaysWhite:
        if (!WhiteOnMove(forwardMostMove)) {
            DisplayError(_("It is your turn"), 0);
            return;
        }
        cps = &first;
        break;
      case MachinePlaysBlack:
        if (WhiteOnMove(forwardMostMove)) {
            DisplayError(_("It is your turn"), 0);
            return;
        }
        cps = &first;
        break;
      case TwoMachinesPlay:
        if (WhiteOnMove(forwardMostMove) ==
            (first.twoMachinesColor[0] == 'w')) {
            cps = &first;
        } else {
            cps = &second;
        }
        break;
      case BeginningOfGame:
      default:
        return;
    }
    SendToProgram("?\n", cps);
}

void
TruncateGameEvent ()
{
    EditGameEvent();
    if (gameMode != EditGame) return;
    TruncateGame();
}

void
TruncateGame ()
{
    CleanupTail(); // [HGM] vari: only keep current variation if we explicitly truncate
    if (forwardMostMove > currentMove) {
        if (gameInfo.resultDetails != NULL) {
            free(gameInfo.resultDetails);
            gameInfo.resultDetails = NULL;
            gameInfo.result = GameUnfinished;
        }
        forwardMostMove = currentMove;
        HistorySet(parseList, backwardMostMove, forwardMostMove,
                   currentMove-1);
    }
}

void
HintEvent ()
{
    if (appData.noChessProgram) return;
    switch (gameMode) {
      case MachinePlaysWhite:
        if (WhiteOnMove(forwardMostMove)) {
            DisplayError(_("Wait until your turn"), 0);
            return;
        }
        break;
      case BeginningOfGame:
      case MachinePlaysBlack:
        if (!WhiteOnMove(forwardMostMove)) {
            DisplayError(_("Wait until your turn"), 0);
            return;
        }
        break;
      default:
        DisplayError(_("No hint available"), 0);
        return;
    }
    SendToProgram("hint\n", &first);
    hintRequested = TRUE;
}

void
BookEvent ()
{
    if (appData.noChessProgram) return;
    switch (gameMode) {
      case MachinePlaysWhite:
        if (WhiteOnMove(forwardMostMove)) {
            DisplayError(_("Wait until your turn"), 0);
            return;
        }
        break;
      case BeginningOfGame:
      case MachinePlaysBlack:
        if (!WhiteOnMove(forwardMostMove)) {
            DisplayError(_("Wait until your turn"), 0);
            return;
        }
        break;
      case EditPosition:
        EditPositionDone(TRUE);
        break;
      case TwoMachinesPlay:
        return;
      default:
        break;
    }
    SendToProgram("bk\n", &first);
    bookOutput[0] = NULLCHAR;
    bookRequested = TRUE;
}

void
AboutGameEvent ()
{
    char *tags = PGNTags(&gameInfo);
    TagsPopUp(tags, CmailMsg());
    free(tags);
}

/* end button procedures */

void
PrintPosition (FILE *fp, int move)
{
    int i, j;

    for (i = BOARD_HEIGHT - 1; i >= 0; i--) {
        for (j = BOARD_LEFT; j < BOARD_RGHT; j++) {
            char c = PieceToChar(boards[move][i][j]);
            fputc(c == 'x' ? '.' : c, fp);
            fputc(j == BOARD_RGHT - 1 ? '\n' : ' ', fp);
        }
    }
    if ((gameMode == EditPosition) ? !blackPlaysFirst : (move % 2 == 0))
      fprintf(fp, "white to play\n");
    else
      fprintf(fp, "black to play\n");
}

void
PrintOpponents (FILE *fp)
{
    if (gameInfo.white != NULL) {
        fprintf(fp, "\t%s vs. %s\n", gameInfo.white, gameInfo.black);
    } else {
        fprintf(fp, "\n");
    }
}

/* Find last component of program's own name, using some heuristics */
void
TidyProgramName (char *prog, char *host, char buf[MSG_SIZ])
{
    char *p, *q, c;
    int local = (strcmp(host, "localhost") == 0);
    while (!local && (p = strchr(prog, ';')) != NULL) {
        p++;
        while (*p == ' ') p++;
        prog = p;
    }
    if (*prog == '"' || *prog == '\'') {
        q = strchr(prog + 1, *prog);
    } else {
        q = strchr(prog, ' ');
    }
    if (q == NULL) q = prog + strlen(prog);
    p = q;
    while (p >= prog && *p != '/' && *p != '\\') p--;
    p++;
    if(p == prog && *p == '"') p++;
    c = *q; *q = 0;
    if (q - p >= 4 && StrCaseCmp(q - 4, ".exe") == 0) *q = c, q -= 4; else *q = c;
    memcpy(buf, p, q - p);
    buf[q - p] = NULLCHAR;
    if (!local) {
        strcat(buf, "@");
        strcat(buf, host);
    }
}

char *
TimeControlTagValue ()
{
    char buf[MSG_SIZ];
    if (!appData.clockMode) {
      safeStrCpy(buf, "-", sizeof(buf)/sizeof(buf[0]));
    } else if (movesPerSession > 0) {
      snprintf(buf, MSG_SIZ, "%d/%ld", movesPerSession, timeControl/1000);
    } else if (timeIncrement == 0) {
      snprintf(buf, MSG_SIZ, "%ld", timeControl/1000);
    } else {
      snprintf(buf, MSG_SIZ, "%ld+%ld", timeControl/1000, timeIncrement/1000);
    }
    return StrSave(buf);
}

void
SetGameInfo ()
{
    /* This routine is used only for certain modes */
    VariantClass v = gameInfo.variant;
    ChessMove r = GameUnfinished;
    char *p = NULL;

    if(gameMode == EditGame) { // [HGM] vari: do not erase result on EditGame
        r = gameInfo.result;
        p = gameInfo.resultDetails;
        gameInfo.resultDetails = NULL;
    }
    ClearGameInfo(&gameInfo);
    gameInfo.variant = v;

    switch (gameMode) {
      case MachinePlaysWhite:
        gameInfo.event = StrSave( appData.pgnEventHeader );
        gameInfo.site = StrSave(HostName());
        gameInfo.date = PGNDate();
        gameInfo.round = StrSave("-");
        gameInfo.white = StrSave(first.tidy);
        gameInfo.black = StrSave(UserName());
        gameInfo.timeControl = TimeControlTagValue();
        break;

      case MachinePlaysBlack:
        gameInfo.event = StrSave( appData.pgnEventHeader );
        gameInfo.site = StrSave(HostName());
        gameInfo.date = PGNDate();
        gameInfo.round = StrSave("-");
        gameInfo.white = StrSave(UserName());
        gameInfo.black = StrSave(first.tidy);
        gameInfo.timeControl = TimeControlTagValue();
        break;

      case TwoMachinesPlay:
        gameInfo.event = StrSave( appData.pgnEventHeader );
        gameInfo.site = StrSave(HostName());
        gameInfo.date = PGNDate();
        if (roundNr > 0) {
            char buf[MSG_SIZ];
            snprintf(buf, MSG_SIZ, "%d", roundNr);
            gameInfo.round = StrSave(buf);
        } else {
            gameInfo.round = StrSave("-");
        }
        if (first.twoMachinesColor[0] == 'w') {
            gameInfo.white = StrSave(appData.pgnName[0][0] ? appData.pgnName[0] : first.tidy);
            gameInfo.black = StrSave(appData.pgnName[1][0] ? appData.pgnName[1] : second.tidy);
        } else {
            gameInfo.white = StrSave(appData.pgnName[1][0] ? appData.pgnName[1] : second.tidy);
            gameInfo.black = StrSave(appData.pgnName[0][0] ? appData.pgnName[0] : first.tidy);
        }
        gameInfo.timeControl = TimeControlTagValue();
        break;

      case EditGame:
        gameInfo.event = StrSave("Edited game");
        gameInfo.site = StrSave(HostName());
        gameInfo.date = PGNDate();
        gameInfo.round = StrSave("-");
        gameInfo.white = StrSave("-");
        gameInfo.black = StrSave("-");
        gameInfo.result = r;
        gameInfo.resultDetails = p;
        break;

      case EditPosition:
        gameInfo.event = StrSave("Edited position");
        gameInfo.site = StrSave(HostName());
        gameInfo.date = PGNDate();
        gameInfo.round = StrSave("-");
        gameInfo.white = StrSave("-");
        gameInfo.black = StrSave("-");
        break;

      case IcsPlayingWhite:
      case IcsPlayingBlack:
      case IcsObserving:
      case IcsExamining:
        break;

      case PlayFromGameFile:
        gameInfo.event = StrSave("Game from non-PGN file");
        gameInfo.site = StrSave(HostName());
        gameInfo.date = PGNDate();
        gameInfo.round = StrSave("-");
        gameInfo.white = StrSave("?");
        gameInfo.black = StrSave("?");
        break;

      default:
        break;
    }
}

void
ReplaceComment (int index, char *text)
{
    int len;
    char *p;
    float score;

    if(index && sscanf(text, "%f/%d", &score, &len) == 2 && 
       pvInfoList[index-1].depth == len &&
       fabs(pvInfoList[index-1].score - score*100.) < 0.5 &&
       (p = strchr(text, '\n'))) text = p; // [HGM] strip off first line with PV info, if any
    while (*text == '\n') text++;
    len = strlen(text);
    while (len > 0 && text[len - 1] == '\n') len--;

    if (commentList[index] != NULL)
      free(commentList[index]);

    if (len == 0) {
        commentList[index] = NULL;
        return;
    }
  if( *text == '{' && strchr(text, '}') || // [HGM] braces: if certainy malformed, put braces
      *text == '[' && strchr(text, ']') || // otherwise hope the user knows what he is doing
      *text == '(' && strchr(text, ')')) { // (perhaps check if this parses as comment-only?)
    commentList[index] = (char *) malloc(len + 2);
    strncpy(commentList[index], text, len);
    commentList[index][len] = '\n';
    commentList[index][len + 1] = NULLCHAR;
  } else {
    // [HGM] braces: if text does not start with known OK delimiter, put braces around it.
    char *p;
    commentList[index] = (char *) malloc(len + 7);
    safeStrCpy(commentList[index], "{\n", 3);
    safeStrCpy(commentList[index]+2, text, len+1);
    commentList[index][len+2] = NULLCHAR;
    while(p = strchr(commentList[index], '}')) *p = ')'; // kill all } to make it one comment
    strcat(commentList[index], "\n}\n");
  }
}

void
CrushCRs (char *text)
{
  char *p = text;
  char *q = text;
  char ch;

  do {
    ch = *p++;
    if (ch == '\r') continue;
    *q++ = ch;
  } while (ch != '\0');
}

void
AppendComment (int index, char *text, Boolean addBraces)
/* addBraces  tells if we should add {} */
{
    int oldlen, len;
    char *old;

if(appData.debugMode) fprintf(debugFP, "Append: in='%s' %d\n", text, addBraces); fflush(debugFP);
    text = GetInfoFromComment( index, text ); /* [HGM] PV time: strip PV info from comment */

    CrushCRs(text);
    while (*text == '\n') text++;
    len = strlen(text);
    while (len > 0 && text[len - 1] == '\n') len--;
    text[len] = NULLCHAR;

    if (len == 0) return;

    if (commentList[index] != NULL) {
      Boolean addClosingBrace = addBraces;
        old = commentList[index];
        oldlen = strlen(old);
        while(commentList[index][oldlen-1] ==  '\n')
          commentList[index][--oldlen] = NULLCHAR;
        commentList[index] = (char *) malloc(oldlen + len + 6); // might waste 4
        safeStrCpy(commentList[index], old, oldlen + len + 6);
        free(old);
        // [HGM] braces: join "{A\n}\n" + "{\nB}" as "{A\nB\n}"
        if(commentList[index][oldlen-1] == '}' && (text[0] == '{' || addBraces == TRUE)) {
          if(addBraces == TRUE) addBraces = FALSE; else { text++; len--; }
          while (*text == '\n') { text++; len--; }
          commentList[index][--oldlen] = NULLCHAR;
      }
        if(addBraces) strcat(commentList[index], addBraces == 2 ? "\n(" : "\n{\n");
        else          strcat(commentList[index], "\n");
        strcat(commentList[index], text);
        if(addClosingBrace) strcat(commentList[index], addClosingBrace == 2 ? ")\n" : "\n}\n");
        else          strcat(commentList[index], "\n");
    } else {
        commentList[index] = (char *) malloc(len + 6); // perhaps wastes 4...
        if(addBraces)
          safeStrCpy(commentList[index], addBraces == 2 ? "(" : "{\n", 3);
        else commentList[index][0] = NULLCHAR;
        strcat(commentList[index], text);
        strcat(commentList[index], addBraces == 2 ? ")\n" : "\n");
        if(addBraces == TRUE) strcat(commentList[index], "}\n");
    }
}

static char *
FindStr (char * text, char * sub_text)
{
    char * result = strstr( text, sub_text );

    if( result != NULL ) {
        result += strlen( sub_text );
    }

    return result;
}

/* [AS] Try to extract PV info from PGN comment */
/* [HGM] PV time: and then remove it, to prevent it appearing twice */
char *
GetInfoFromComment (int index, char * text)
{
    char * sep = text, *p;

    if( text != NULL && index > 0 ) {
        int score = 0;
        int depth = 0;
        int time = -1, sec = 0, deci;
        char * s_eval = FindStr( text, "[%eval " );
        char * s_emt = FindStr( text, "[%emt " );

        if( s_eval != NULL || s_emt != NULL ) {
            /* New style */
            char delim;

            if( s_eval != NULL ) {
                if( sscanf( s_eval, "%d,%d%c", &score, &depth, &delim ) != 3 ) {
                    return text;
                }

                if( delim != ']' ) {
                    return text;
                }
            }

            if( s_emt != NULL ) {
            }
                return text;
        }
        else {
            /* We expect something like: [+|-]nnn.nn/dd */
            int score_lo = 0;

            if(*text != '{') return text; // [HGM] braces: must be normal comment

            sep = strchr( text, '/' );
            if( sep == NULL || sep < (text+4) ) {
                return text;
            }

            p = text;
            if(p[1] == '(') { // comment starts with PV
               p = strchr(p, ')'); // locate end of PV
               if(p == NULL || sep < p+5) return text;
               // at this point we have something like "{(.*) +0.23/6 ..."
               p = text; while(*++p != ')') p[-1] = *p; p[-1] = ')';
               *p = '\n'; while(*p == ' ' || *p == '\n') p++; *--p = '{';
               // we now moved the brace to behind the PV: "(.*) {+0.23/6 ..."
            }
            time = -1; sec = -1; deci = -1;
            if( sscanf( p+1, "%d.%d/%d %d:%d", &score, &score_lo, &depth, &time, &sec ) != 5 &&
                sscanf( p+1, "%d.%d/%d %d.%d", &score, &score_lo, &depth, &time, &deci ) != 5 &&
                sscanf( p+1, "%d.%d/%d %d", &score, &score_lo, &depth, &time ) != 4 &&
                sscanf( p+1, "%d.%d/%d", &score, &score_lo, &depth ) != 3   ) {
                return text;
            }

            if( score_lo < 0 || score_lo >= 100 ) {
                return text;
            }

            if(sec >= 0) time = 600*time + 10*sec; else
            if(deci >= 0) time = 10*time + deci; else time *= 10; // deci-sec

            score = score >= 0 ? score*100 + score_lo : score*100 - score_lo;

            /* [HGM] PV time: now locate end of PV info */
            while( *++sep >= '0' && *sep <= '9'); // strip depth
            if(time >= 0)
            while( *++sep >= '0' && *sep <= '9' || *sep == '\n'); // strip time
            if(sec >= 0)
            while( *++sep >= '0' && *sep <= '9'); // strip seconds
            if(deci >= 0)
            while( *++sep >= '0' && *sep <= '9'); // strip fractional seconds
            while(*sep == ' ' || *sep == '\n' || *sep == '\r') sep++;
        }

        if( depth <= 0 ) {
            return text;
        }

        if( time < 0 ) {
            time = -1;
        }

        pvInfoList[index-1].depth = depth;
        pvInfoList[index-1].score = score;
        pvInfoList[index-1].time  = 10*time; // centi-sec
        if(*sep == '}') *sep = 0; else *--sep = '{';
        if(p != text) { while(*p++ = *sep++); sep = text; } // squeeze out space between PV and comment, and return both
    }
    return sep;
}

void
SendToProgram (char *message, ChessProgramState *cps)
{
    int count, outCount, error;
    char buf[MSG_SIZ];

    if (cps->pr == NoProc) return;
    Attention(cps);

    if (appData.debugMode) {
        TimeMark now;
        GetTimeMark(&now);
        fprintf(debugFP, "%ld >%-6s: %s",
                SubtractTimeMarks(&now, &programStartTime),
                cps->which, message);
    }

    count = strlen(message);
    outCount = OutputToProcess(cps->pr, message, count, &error);
    if (outCount < count && !exiting
                         && !endingGame) { /* [HGM] crash: to not hang GameEnds() writing to deceased engines */
      if(!cps->initDone) return; // [HGM] should not generate fatal error during engine load
      snprintf(buf, MSG_SIZ, _("Error writing to %s chess program"), _(cps->which));
        if(gameInfo.resultDetails==NULL) { /* [HGM] crash: if game in progress, give reason for abort */
            if((signed char)boards[forwardMostMove][EP_STATUS] <= EP_DRAWS) {
                snprintf(buf, MSG_SIZ, _("%s program exits in draw position (%s)"), _(cps->which), cps->program);
                if(matchMode && appData.tourneyFile[0]) { cps->pr = NoProc; GameEnds(GameIsDrawn, buf, GE_XBOARD); return; }
                gameInfo.result = GameIsDrawn; /* [HGM] accept exit as draw claim */
            } else {
                ChessMove res = cps->twoMachinesColor[0]=='w' ? BlackWins : WhiteWins;
                if(matchMode && appData.tourneyFile[0]) { cps->pr = NoProc; GameEnds(res, buf, GE_XBOARD); return; }
                gameInfo.result = res;
            }
            gameInfo.resultDetails = StrSave(buf);
        }
        if(matchMode && appData.tourneyFile[0]) { cps->pr = NoProc; return; }
        if(!cps->userError || !appData.popupExitMessage) DisplayFatalError(buf, error, 1); else errorExitStatus = 1;
    }
}

void
ReceiveFromProgram (InputSourceRef isr, VOIDSTAR closure, char *message, int count, int error)
{
    char *end_str;
    char buf[MSG_SIZ];
    ChessProgramState *cps = (ChessProgramState *)closure;

    if (isr != cps->isr) return; /* Killed intentionally */
    if (count <= 0) {
        if (count == 0) {
            RemoveInputSource(cps->isr);
            if(!cps->initDone) return; // [HGM] should not generate fatal error during engine load
            snprintf(buf, MSG_SIZ, _("Error: %s chess program (%s) exited unexpectedly"),
                    _(cps->which), cps->program);
        if(gameInfo.resultDetails==NULL) { /* [HGM] crash: if game in progress, give reason for abort */
                if((signed char)boards[forwardMostMove][EP_STATUS] <= EP_DRAWS) {
                    snprintf(buf, MSG_SIZ, _("%s program exits in draw position (%s)"), _(cps->which), cps->program);
                    if(matchMode && appData.tourneyFile[0]) { cps->pr = NoProc; GameEnds(GameIsDrawn, buf, GE_XBOARD); return; }
                    gameInfo.result = GameIsDrawn; /* [HGM] accept exit as draw claim */
                } else {
                    ChessMove res = cps->twoMachinesColor[0]=='w' ? BlackWins : WhiteWins;
                    if(matchMode && appData.tourneyFile[0]) { cps->pr = NoProc; GameEnds(res, buf, GE_XBOARD); return; }
                    gameInfo.result = res;
                }
                gameInfo.resultDetails = StrSave(buf);
            }
            if(matchMode && appData.tourneyFile[0]) { cps->pr = NoProc; return; }
            if(!cps->userError || !appData.popupExitMessage) DisplayFatalError(buf, 0, 1); else errorExitStatus = 1;
        } else {
            snprintf(buf, MSG_SIZ, _("Error reading from %s chess program (%s)"),
                    _(cps->which), cps->program);
            RemoveInputSource(cps->isr);

            /* [AS] Program is misbehaving badly... kill it */
            if( count == -2 ) {
                DestroyChildProcess( cps->pr, 9 );
                cps->pr = NoProc;
            }

            if(!cps->userError || !appData.popupExitMessage) DisplayFatalError(buf, error, 1); else errorExitStatus = 1;
        }
        return;
    }

    if ((end_str = strchr(message, '\r')) != NULL)
      *end_str = NULLCHAR;
    if ((end_str = strchr(message, '\n')) != NULL)
      *end_str = NULLCHAR;

    if (appData.debugMode) {
        TimeMark now; int print = 1;
        char *quote = ""; char c; int i;

        if(appData.engineComments != 1) { /* [HGM] debug: decide if protocol-violating output is written */
                char start = message[0];
                if(start >='A' && start <= 'Z') start += 'a' - 'A'; // be tolerant to capitalizing
                if(sscanf(message, "%d%c%d%d%d", &i, &c, &i, &i, &i) != 5 &&
                   sscanf(message, "move %c", &c)!=1  && sscanf(message, "offer%c", &c)!=1 &&
                   sscanf(message, "resign%c", &c)!=1 && sscanf(message, "feature %c", &c)!=1 &&
                   sscanf(message, "error %c", &c)!=1 && sscanf(message, "illegal %c", &c)!=1 &&
                   sscanf(message, "tell%c", &c)!=1   && sscanf(message, "0-1 %c", &c)!=1 &&
                   sscanf(message, "1-0 %c", &c)!=1   && sscanf(message, "1/2-1/2 %c", &c)!=1 &&
                   sscanf(message, "setboard %c", &c)!=1   && sscanf(message, "setup %c", &c)!=1 &&
                   sscanf(message, "hint: %c", &c)!=1 && 
                   sscanf(message, "pong %c", &c)!=1   && start != '#') {
                    quote = appData.engineComments == 2 ? "# " : "### NON-COMPLIANT! ### ";
                    print = (appData.engineComments >= 2);
                }
                message[0] = start; // restore original message
        }
        if(print) {
                GetTimeMark(&now);
                fprintf(debugFP, "%ld <%-6s: %s%s\n",
                        SubtractTimeMarks(&now, &programStartTime), cps->which,
                        quote,
                        message);
        }
    }

    /* [DM] if icsEngineAnalyze is active we block all whisper and kibitz output, because nobody want to see this */
    if (appData.icsEngineAnalyze) {
        if (strstr(message, "whisper") != NULL ||
             strstr(message, "kibitz") != NULL ||
            strstr(message, "tellics") != NULL) return;
    }

    HandleMachineMove(message, cps);
}


void
SendTimeControl (ChessProgramState *cps, int mps, long tc, int inc, int sd, int st)
{
    char buf[MSG_SIZ];
    int seconds;

    if( timeControl_2 > 0 ) {
        if( (gameMode == MachinePlaysBlack) || (gameMode == TwoMachinesPlay && cps->twoMachinesColor[0] == 'b') ) {
            tc = timeControl_2;
        }
    }
    tc  /= cps->timeOdds; /* [HGM] time odds: apply before telling engine */
    inc /= cps->timeOdds;
    st  /= cps->timeOdds;

    seconds = (tc / 1000) % 60; /* [HGM] displaced to after applying odds */

    if (st > 0) {
      /* Set exact time per move, normally using st command */
      if (cps->stKludge) {
        /* GNU Chess 4 has no st command; uses level in a nonstandard way */
        seconds = st % 60;
        if (seconds == 0) {
          snprintf(buf, MSG_SIZ, "level 1 %d\n", st/60);
        } else {
          snprintf(buf, MSG_SIZ, "level 1 %d:%02d\n", st/60, seconds);
        }
      } else {
        snprintf(buf, MSG_SIZ, "st %d\n", st);
      }
    } else {
      /* Set conventional or incremental time control, using level command */
      if (seconds == 0) {
        /* Note old gnuchess bug -- minutes:seconds used to not work.
           Fixed in later versions, but still avoid :seconds
           when seconds is 0. */
        snprintf(buf, MSG_SIZ, "level %d %ld %g\n", mps, tc/60000, inc/1000.);
      } else {
        snprintf(buf, MSG_SIZ, "level %d %ld:%02d %g\n", mps, tc/60000,
                 seconds, inc/1000.);
      }
    }
    SendToProgram(buf, cps);

    /* Orthoganally (except for GNU Chess 4), limit time to st seconds */
    /* Orthogonally, limit search to given depth */
    if (sd > 0) {
      if (cps->sdKludge) {
        snprintf(buf, MSG_SIZ, "depth\n%d\n", sd);
      } else {
        snprintf(buf, MSG_SIZ, "sd %d\n", sd);
      }
      SendToProgram(buf, cps);
    }

    if(cps->nps >= 0) { /* [HGM] nps */
        if(cps->supportsNPS == FALSE)
          cps->nps = -1; // don't use if engine explicitly says not supported!
        else {
          snprintf(buf, MSG_SIZ, "nps %d\n", cps->nps);
          SendToProgram(buf, cps);
        }
    }
}

ChessProgramState *
WhitePlayer ()
/* [HGM] return pointer to 'first' or 'second', depending on who plays white */
{
    if(gameMode == TwoMachinesPlay && first.twoMachinesColor[0] == 'b' ||
       gameMode == BeginningOfGame || gameMode == MachinePlaysBlack)
        return &second;
    return &first;
}

void
SendTimeRemaining (ChessProgramState *cps, int machineWhite)
{
    char message[MSG_SIZ];
    long time, otime;

    /* Note: this routine must be called when the clocks are stopped
       or when they have *just* been set or switched; otherwise
       it will be off by the time since the current tick started.
    */
    if (machineWhite) {
        time = whiteTimeRemaining / 10;
        otime = blackTimeRemaining / 10;
    } else {
        time = blackTimeRemaining / 10;
        otime = whiteTimeRemaining / 10;
    }
    /* [HGM] translate opponent's time by time-odds factor */
    otime = (otime * cps->other->timeOdds) / cps->timeOdds;

    if (time <= 0) time = 1;
    if (otime <= 0) otime = 1;

    snprintf(message, MSG_SIZ, "time %ld\n", time);
    SendToProgram(message, cps);

    snprintf(message, MSG_SIZ, "otim %ld\n", otime);
    SendToProgram(message, cps);
}

int
BoolFeature (char **p, char *name, int *loc, ChessProgramState *cps)
{
  char buf[MSG_SIZ];
  int len = strlen(name);
  int val;

  if (strncmp((*p), name, len) == 0 && (*p)[len] == '=') {
    (*p) += len + 1;
    sscanf(*p, "%d", &val);
    *loc = (val != 0);
    while (**p && **p != ' ')
      (*p)++;
    snprintf(buf, MSG_SIZ, "accepted %s\n", name);
    SendToProgram(buf, cps);
    return TRUE;
  }
  return FALSE;
}

int
IntFeature (char **p, char *name, int *loc, ChessProgramState *cps)
{
  char buf[MSG_SIZ];
  int len = strlen(name);
  if (strncmp((*p), name, len) == 0 && (*p)[len] == '=') {
    (*p) += len + 1;
    sscanf(*p, "%d", loc);
    while (**p && **p != ' ') (*p)++;
    snprintf(buf, MSG_SIZ, "accepted %s\n", name);
    SendToProgram(buf, cps);
    return TRUE;
  }
  return FALSE;
}

int
StringFeature (char **p, char *name, char loc[], ChessProgramState *cps)
{
  char buf[MSG_SIZ];
  int len = strlen(name);
  if (strncmp((*p), name, len) == 0
      && (*p)[len] == '=' && (*p)[len+1] == '\"') {
    (*p) += len + 2;
    sscanf(*p, "%[^\"]", loc);
    while (**p && **p != '\"') (*p)++;
    if (**p == '\"') (*p)++;
    snprintf(buf, MSG_SIZ, "accepted %s\n", name);
    SendToProgram(buf, cps);
    return TRUE;
  }
  return FALSE;
}

int
ParseOption (Option *opt, ChessProgramState *cps)
// [HGM] options: process the string that defines an engine option, and determine
// name, type, default value, and allowed value range
{
        char *p, *q, buf[MSG_SIZ];
        int n, min = (-1)<<31, max = 1<<31, def;

        if(p = strstr(opt->name, " -spin ")) {
            if((n = sscanf(p, " -spin %d %d %d", &def, &min, &max)) < 3 ) return FALSE;
            if(max < min) max = min; // enforce consistency
            if(def < min) def = min;
            if(def > max) def = max;
            opt->value = def;
            opt->min = min;
            opt->max = max;
            opt->type = Spin;
        } else if((p = strstr(opt->name, " -slider "))) {
            // for now -slider is a synonym for -spin, to already provide compatibility with future polyglots
            if((n = sscanf(p, " -slider %d %d %d", &def, &min, &max)) < 3 ) return FALSE;
            if(max < min) max = min; // enforce consistency
            if(def < min) def = min;
            if(def > max) def = max;
            opt->value = def;
            opt->min = min;
            opt->max = max;
            opt->type = Spin; // Slider;
        } else if((p = strstr(opt->name, " -string "))) {
            opt->textValue = p+9;
            opt->type = TextBox;
        } else if((p = strstr(opt->name, " -file "))) {
            // for now -file is a synonym for -string, to already provide compatibility with future polyglots
            opt->textValue = p+7;
            opt->type = FileName; // FileName;
        } else if((p = strstr(opt->name, " -path "))) {
            // for now -file is a synonym for -string, to already provide compatibility with future polyglots
            opt->textValue = p+7;
            opt->type = PathName; // PathName;
        } else if(p = strstr(opt->name, " -check ")) {
            if(sscanf(p, " -check %d", &def) < 1) return FALSE;
            opt->value = (def != 0);
            opt->type = CheckBox;
        } else if(p = strstr(opt->name, " -combo ")) {
            opt->textValue = (char*) (&cps->comboList[cps->comboCnt]); // cheat with pointer type
            cps->comboList[cps->comboCnt++] = q = p+8; // holds possible choices
            if(*q == '*') cps->comboList[cps->comboCnt-1]++;
            opt->value = n = 0;
            while(q = StrStr(q, " /// ")) {
                n++; *q = 0;    // count choices, and null-terminate each of them
                q += 5;
                if(*q == '*') { // remember default, which is marked with * prefix
                    q++;
                    opt->value = n;
                }
                cps->comboList[cps->comboCnt++] = q;
            }
            cps->comboList[cps->comboCnt++] = NULL;
            opt->max = n + 1;
            opt->type = ComboBox;
        } else if(p = strstr(opt->name, " -button")) {
            opt->type = Button;
        } else if(p = strstr(opt->name, " -save")) {
            opt->type = SaveButton;
        } else return FALSE;
        *p = 0; // terminate option name
        // now look if the command-line options define a setting for this engine option.
        if(cps->optionSettings && cps->optionSettings[0])
            p = strstr(cps->optionSettings, opt->name); else p = NULL;
        if(p && (p == cps->optionSettings || p[-1] == ',')) {
          snprintf(buf, MSG_SIZ, "option %s", p);
                if(p = strstr(buf, ",")) *p = 0;
                if(q = strchr(buf, '=')) switch(opt->type) {
                    case ComboBox:
                        for(n=0; n<opt->max; n++)
                            if(!strcmp(((char**)opt->textValue)[n], q+1)) opt->value = n;
                        break;
                    case TextBox:
                        safeStrCpy(opt->textValue, q+1, MSG_SIZ - (opt->textValue - opt->name));
                        break;
                    case Spin:
                    case CheckBox:
                        opt->value = atoi(q+1);
                    default:
                        break;
                }
                strcat(buf, "\n");
                SendToProgram(buf, cps);
        }
        return TRUE;
}

void
FeatureDone (ChessProgramState *cps, int val)
{
  DelayedEventCallback cb = GetDelayedEvent();
  if ((cb == InitBackEnd3 && cps == &first) ||
      (cb == SettingsMenuIfReady && cps == &second) ||
      (cb == LoadEngine) ||
      (cb == TwoMachinesEventIfReady)) {
    CancelDelayedEvent();
    ScheduleDelayedEvent(cb, val ? 1 : 3600000);
  }
  cps->initDone = val;
}

/* Parse feature command from engine */
void
ParseFeatures (char *args, ChessProgramState *cps)
{
  char *p = args;
  char *q;
  int val;
  char buf[MSG_SIZ];

  for (;;) {
    while (*p == ' ') p++;
    if (*p == NULLCHAR) return;

    if (BoolFeature(&p, "setboard", &cps->useSetboard, cps)) continue;
    if (BoolFeature(&p, "xedit", &cps->extendedEdit, cps)) continue;
    if (BoolFeature(&p, "time", &cps->sendTime, cps)) continue;
    if (BoolFeature(&p, "draw", &cps->sendDrawOffers, cps)) continue;
    if (BoolFeature(&p, "sigint", &cps->useSigint, cps)) continue;
    if (BoolFeature(&p, "sigterm", &cps->useSigterm, cps)) continue;
    if (BoolFeature(&p, "reuse", &val, cps)) {
      /* Engine can disable reuse, but can't enable it if user said no */
      if (!val) cps->reuse = FALSE;
      continue;
    }
    if (BoolFeature(&p, "analyze", &cps->analysisSupport, cps)) continue;
    if (StringFeature(&p, "myname", cps->tidy, cps)) {
      if (gameMode == TwoMachinesPlay) {
        DisplayTwoMachinesTitle();
      } else {
        DisplayTitle("");
      }
      continue;
    }
    if (StringFeature(&p, "variants", cps->variants, cps)) continue;
    if (BoolFeature(&p, "san", &cps->useSAN, cps)) continue;
    if (BoolFeature(&p, "ping", &cps->usePing, cps)) continue;
    if (BoolFeature(&p, "playother", &cps->usePlayother, cps)) continue;
    if (BoolFeature(&p, "colors", &cps->useColors, cps)) continue;
    if (BoolFeature(&p, "usermove", &cps->useUsermove, cps)) continue;
    if (BoolFeature(&p, "ics", &cps->sendICS, cps)) continue;
    if (BoolFeature(&p, "name", &cps->sendName, cps)) continue;
    if (BoolFeature(&p, "pause", &val, cps)) continue; /* unused at present */
    if (IntFeature(&p, "done", &val, cps)) {
      FeatureDone(cps, val);
      continue;
    }
    /* Added by Tord: */
    if (BoolFeature(&p, "fen960", &cps->useFEN960, cps)) continue;
    if (BoolFeature(&p, "oocastle", &cps->useOOCastle, cps)) continue;
    /* End of additions by Tord */

    /* [HGM] added features: */
    if (BoolFeature(&p, "debug", &cps->debug, cps)) continue;
    if (BoolFeature(&p, "nps", &cps->supportsNPS, cps)) continue;
    if (IntFeature(&p, "level", &cps->maxNrOfSessions, cps)) continue;
    if (BoolFeature(&p, "memory", &cps->memSize, cps)) continue;
    if (BoolFeature(&p, "smp", &cps->maxCores, cps)) continue;
    if (StringFeature(&p, "egt", cps->egtFormats, cps)) continue;
    if (StringFeature(&p, "option", cps->option[cps->nrOptions].name, cps)) {
        if(!ParseOption(&(cps->option[cps->nrOptions++]), cps)) { // [HGM] options: add option feature
          snprintf(buf, MSG_SIZ, "rejected option %s\n", cps->option[--cps->nrOptions].name);
            SendToProgram(buf, cps);
            continue;
        }
        if(cps->nrOptions >= MAX_OPTIONS) {
            cps->nrOptions--;
            snprintf(buf, MSG_SIZ, _("%s engine has too many options\n"), _(cps->which));
            DisplayError(buf, 0);
        }
        continue;
    }
    /* End of additions by HGM */

    /* unknown feature: complain and skip */
    q = p;
    while (*q && *q != '=') q++;
    snprintf(buf, MSG_SIZ,"rejected %.*s\n", (int)(q-p), p);
    SendToProgram(buf, cps);
    p = q;
    if (*p == '=') {
      p++;
      if (*p == '\"') {
        p++;
        while (*p && *p != '\"') p++;
        if (*p == '\"') p++;
      } else {
        while (*p && *p != ' ') p++;
      }
    }
  }

}

void
PeriodicUpdatesEvent (int newState)
{
    if (newState == appData.periodicUpdates)
      return;

    appData.periodicUpdates=newState;

    /* Display type changes, so update it now */
//    DisplayAnalysis();

    /* Get the ball rolling again... */
    if (newState) {
        AnalysisPeriodicEvent(1);
        StartAnalysisClock();
    }
}

void
PonderNextMoveEvent (int newState)
{
    if (newState == appData.ponderNextMove) return;
    if (gameMode == EditPosition) EditPositionDone(TRUE);
    if (newState) {
        SendToProgram("hard\n", &first);
        if (gameMode == TwoMachinesPlay) {
            SendToProgram("hard\n", &second);
        }
    } else {
        SendToProgram("easy\n", &first);
        thinkOutput[0] = NULLCHAR;
        if (gameMode == TwoMachinesPlay) {
            SendToProgram("easy\n", &second);
        }
    }
    appData.ponderNextMove = newState;
}

void
NewSettingEvent (int option, int *feature, char *command, int value)
{
    char buf[MSG_SIZ];

    if (gameMode == EditPosition) EditPositionDone(TRUE);
    snprintf(buf, MSG_SIZ,"%s%s %d\n", (option ? "option ": ""), command, value);
    if(feature == NULL || *feature) SendToProgram(buf, &first);
    if (gameMode == TwoMachinesPlay) {
        if(feature == NULL || feature[(int*)&second - (int*)&first]) SendToProgram(buf, &second);
    }
}

void
ShowThinkingEvent ()
// [HGM] thinking: this routine is now also called from "Options -> Engine..." popup
{
    static int oldState = 2; // kludge alert! Neither true nor fals, so first time oldState is always updated
    int newState = appData.showThinking
        // [HGM] thinking: other features now need thinking output as well
        || !appData.hideThinkingFromHuman || appData.adjudicateLossThreshold != 0 || EngineOutputIsUp();

    if (oldState == newState) return;
    oldState = newState;
    if (gameMode == EditPosition) EditPositionDone(TRUE);
    if (oldState) {
        SendToProgram("post\n", &first);
        if (gameMode == TwoMachinesPlay) {
            SendToProgram("post\n", &second);
        }
    } else {
        SendToProgram("nopost\n", &first);
        thinkOutput[0] = NULLCHAR;
        if (gameMode == TwoMachinesPlay) {
            SendToProgram("nopost\n", &second);
        }
    }
//    appData.showThinking = newState; // [HGM] thinking: responsible option should already have be changed when calling this routine!
}

void
AskQuestionEvent (char *title, char *question, char *replyPrefix, char *which)
{
  ProcRef pr = (which[0] == '1') ? first.pr : second.pr;
  if (pr == NoProc) return;
  AskQuestion(title, question, replyPrefix, pr);
}

void
TypeInEvent (char firstChar)
{
    if ((gameMode == BeginningOfGame && !appData.icsActive) || 
        gameMode == MachinePlaysWhite || gameMode == MachinePlaysBlack ||
        gameMode == AnalyzeMode || gameMode == EditGame || 
        gameMode == EditPosition || gameMode == IcsExamining ||
        gameMode == IcsPlayingWhite || gameMode == IcsPlayingBlack ||
        isdigit(firstChar) && // [HGM] movenum: allow typing in of move nr in 'passive' modes
                ( gameMode == AnalyzeFile || gameMode == PlayFromGameFile ||
                  gameMode == IcsObserving || gameMode == TwoMachinesPlay    ) ||
        gameMode == Training) PopUpMoveDialog(firstChar);
}

void
TypeInDoneEvent (char *move)
{
        Board board;
        int n, fromX, fromY, toX, toY;
        char promoChar;
        ChessMove moveType;

        // [HGM] FENedit
        if(gameMode == EditPosition && ParseFEN(board, &n, move) ) {
                EditPositionPasteFEN(move);
                return;
        }
        // [HGM] movenum: allow move number to be typed in any mode
        if(sscanf(move, "%d", &n) == 1 && n != 0 ) {
          ToNrEvent(2*n-1);
          return;
        }
        // undocumented kludge: allow command-line option to be typed in!
        // (potentially fatal, and does not implement the effect of the option.)
        // should only be used for options that are values on which future decisions will be made,
        // and definitely not on options that would be used during initialization.
        if(strstr(move, "!!! -") == move) {
            ParseArgsFromString(move+4);
            return;
        }

      if (gameMode != EditGame && currentMove != forwardMostMove && 
        gameMode != Training) {
        DisplayMoveError(_("Displayed move is not current"));
      } else {
        int ok = ParseOneMove(move, gameMode == EditPosition ? blackPlaysFirst : currentMove, 
          &moveType, &fromX, &fromY, &toX, &toY, &promoChar);
        if(!ok && move[0] >= 'a') { move[0] += 'A' - 'a'; ok = 2; } // [HGM] try also capitalized
        if (ok==1 || ok && ParseOneMove(move, gameMode == EditPosition ? blackPlaysFirst : currentMove, 
          &moveType, &fromX, &fromY, &toX, &toY, &promoChar)) {
          UserMoveEvent(fromX, fromY, toX, toY, promoChar);     
        } else {
          DisplayMoveError(_("Could not parse move"));
        }
      }
}

void
DisplayMove (int moveNumber)
{
    char message[MSG_SIZ];
    char res[MSG_SIZ];
    char cpThinkOutput[MSG_SIZ];

    if(appData.noGUI) return; // [HGM] fast: suppress display of moves

    if (moveNumber == forwardMostMove - 1 ||
        gameMode == AnalyzeMode || gameMode == AnalyzeFile) {

        safeStrCpy(cpThinkOutput, thinkOutput, sizeof(cpThinkOutput)/sizeof(cpThinkOutput[0]));

        if (strchr(cpThinkOutput, '\n')) {
            *strchr(cpThinkOutput, '\n') = NULLCHAR;
        }
    } else {
        *cpThinkOutput = NULLCHAR;
    }

    /* [AS] Hide thinking from human user */
    if( appData.hideThinkingFromHuman && gameMode != TwoMachinesPlay ) {
        *cpThinkOutput = NULLCHAR;
        if( thinkOutput[0] != NULLCHAR ) {
            int i;

            for( i=0; i<=hiddenThinkOutputState; i++ ) {
                cpThinkOutput[i] = '.';
            }
            cpThinkOutput[i] = NULLCHAR;
            hiddenThinkOutputState = (hiddenThinkOutputState + 1) % 3;
        }
    }

    if (moveNumber == forwardMostMove - 1 &&
        gameInfo.resultDetails != NULL) {
        if (gameInfo.resultDetails[0] == NULLCHAR) {
          snprintf(res, MSG_SIZ, " %s", PGNResult(gameInfo.result));
        } else {
          snprintf(res, MSG_SIZ, " {%s} %s",
                    T_(gameInfo.resultDetails), PGNResult(gameInfo.result));
        }
    } else {
        res[0] = NULLCHAR;
    }

    if (moveNumber < 0 || parseList[moveNumber][0] == NULLCHAR) {
        DisplayMessage(res, cpThinkOutput);
    } else {
      snprintf(message, MSG_SIZ, "%d.%s%s%s", moveNumber / 2 + 1,
                WhiteOnMove(moveNumber) ? " " : ".. ",
                parseList[moveNumber], res);
        DisplayMessage(message, cpThinkOutput);
    }
}

void
DisplayComment (int moveNumber, char *text)
{
    char title[MSG_SIZ];

    if (moveNumber < 0 || parseList[moveNumber][0] == NULLCHAR) {
      safeStrCpy(title, "Comment", sizeof(title)/sizeof(title[0]));
    } else {
      snprintf(title,MSG_SIZ, "Comment on %d.%s%s", moveNumber / 2 + 1,
              WhiteOnMove(moveNumber) ? " " : ".. ",
              parseList[moveNumber]);
    }
    if (text != NULL && (appData.autoDisplayComment || commentUp))
        CommentPopUp(title, text);
}

/* This routine sends a ^C interrupt to gnuchess, to awaken it if it
 * might be busy thinking or pondering.  It can be omitted if your
 * gnuchess is configured to stop thinking immediately on any user
 * input.  However, that gnuchess feature depends on the FIONREAD
 * ioctl, which does not work properly on some flavors of Unix.
 */
void
Attention (ChessProgramState *cps)
{
#if ATTENTION
    if (!cps->useSigint) return;
    if (appData.noChessProgram || (cps->pr == NoProc)) return;
    switch (gameMode) {
      case MachinePlaysWhite:
      case MachinePlaysBlack:
      case TwoMachinesPlay:
      case IcsPlayingWhite:
      case IcsPlayingBlack:
      case AnalyzeMode:
      case AnalyzeFile:
        /* Skip if we know it isn't thinking */
        if (!cps->maybeThinking) return;
        if (appData.debugMode)
          fprintf(debugFP, "Interrupting %s\n", cps->which);
        InterruptChildProcess(cps->pr);
        cps->maybeThinking = FALSE;
        break;
      default:
        break;
    }
#endif /*ATTENTION*/
}

int
CheckFlags ()
{
    if (whiteTimeRemaining <= 0) {
        if (!whiteFlag) {
            whiteFlag = TRUE;
            if (appData.icsActive) {
                if (appData.autoCallFlag &&
                    gameMode == IcsPlayingBlack && !blackFlag) {
                  SendToICS(ics_prefix);
                  SendToICS("flag\n");
                }
            } else {
                if (blackFlag) {
                    if(gameMode != TwoMachinesPlay) DisplayTitle(_("Both flags fell"));
                } else {
                    if(gameMode != TwoMachinesPlay) DisplayTitle(_("White's flag fell"));
                    if (appData.autoCallFlag) {
                        GameEnds(BlackWins, "Black wins on time", GE_XBOARD);
                        return TRUE;
                    }
                }
            }
        }
    }
    if (blackTimeRemaining <= 0) {
        if (!blackFlag) {
            blackFlag = TRUE;
            if (appData.icsActive) {
                if (appData.autoCallFlag &&
                    gameMode == IcsPlayingWhite && !whiteFlag) {
                  SendToICS(ics_prefix);
                  SendToICS("flag\n");
                }
            } else {
                if (whiteFlag) {
                    if(gameMode != TwoMachinesPlay) DisplayTitle(_("Both flags fell"));
                } else {
                    if(gameMode != TwoMachinesPlay) DisplayTitle(_("Black's flag fell"));
                    if (appData.autoCallFlag) {
                        GameEnds(WhiteWins, "White wins on time", GE_XBOARD);
                        return TRUE;
                    }
                }
            }
        }
    }
    return FALSE;
}

void
CheckTimeControl ()
{
    if (!appData.clockMode || appData.icsActive || searchTime || // [HGM] st: no inc in st mode
        gameMode == PlayFromGameFile || forwardMostMove == 0) return;

    /*
     * add time to clocks when time control is achieved ([HGM] now also used for increment)
     */
    if ( !WhiteOnMove(forwardMostMove) ) {
        /* White made time control */
        lastWhite -= whiteTimeRemaining; // [HGM] contains start time, socalculate thinking time
        whiteTimeRemaining += GetTimeQuota((forwardMostMove-whiteStartMove-1)/2, lastWhite, whiteTC)
        /* [HGM] time odds: correct new time quota for time odds! */
                                            / WhitePlayer()->timeOdds;
        lastBlack = blackTimeRemaining; // [HGM] leave absolute time (after quota), so next switch we can us it to calculate thinking time
    } else {
        lastBlack -= blackTimeRemaining;
        /* Black made time control */
        blackTimeRemaining += GetTimeQuota((forwardMostMove-blackStartMove-1)/2, lastBlack, blackTC)
                                            / WhitePlayer()->other->timeOdds;
        lastWhite = whiteTimeRemaining;
    }
}

void
DisplayBothClocks ()
{
    int wom = gameMode == EditPosition ?
      !blackPlaysFirst : WhiteOnMove(currentMove);
    DisplayWhiteClock(whiteTimeRemaining, wom);
    DisplayBlackClock(blackTimeRemaining, !wom);
}


/* Timekeeping seems to be a portability nightmare.  I think everyone
   has ftime(), but I'm really not sure, so I'm including some ifdefs
   to use other calls if you don't.  Clocks will be less accurate if
   you have neither ftime nor gettimeofday.
*/

/* VS 2008 requires the #include outside of the function */
#if !HAVE_GETTIMEOFDAY && HAVE_FTIME
#include <sys/timeb.h>
#endif

/* Get the current time as a TimeMark */
void
GetTimeMark (TimeMark *tm)
{
#if HAVE_GETTIMEOFDAY

    struct timeval timeVal;
    struct timezone timeZone;

    gettimeofday(&timeVal, &timeZone);
    tm->sec = (long) timeVal.tv_sec;
    tm->ms = (int) (timeVal.tv_usec / 1000L);

#else /*!HAVE_GETTIMEOFDAY*/
#if HAVE_FTIME

// include <sys/timeb.h> / moved to just above start of function
    struct timeb timeB;

    ftime(&timeB);
    tm->sec = (long) timeB.time;
    tm->ms = (int) timeB.millitm;

#else /*!HAVE_FTIME && !HAVE_GETTIMEOFDAY*/
    tm->sec = (long) time(NULL);
    tm->ms = 0;
#endif
#endif
}

/* Return the difference in milliseconds between two
   time marks.  We assume the difference will fit in a long!
*/
long
SubtractTimeMarks (TimeMark *tm2, TimeMark *tm1)
{
    return 1000L*(tm2->sec - tm1->sec) +
           (long) (tm2->ms - tm1->ms);
}


/*
 * Code to manage the game clocks.
 *
 * In tournament play, black starts the clock and then white makes a move.
 * We give the human user a slight advantage if he is playing white---the
 * clocks don't run until he makes his first move, so it takes zero time.
 * Also, we don't account for network lag, so we could get out of sync
 * with GNU Chess's clock -- but then, referees are always right.
 */

static TimeMark tickStartTM;
static long intendedTickLength;

long
NextTickLength (long timeRemaining)
{
    long nominalTickLength, nextTickLength;

    if (timeRemaining > 0L && timeRemaining <= 10000L)
      nominalTickLength = 100L;
    else
      nominalTickLength = 1000L;
    nextTickLength = timeRemaining % nominalTickLength;
    if (nextTickLength <= 0) nextTickLength += nominalTickLength;

    return nextTickLength;
}

/* Adjust clock one minute up or down */
void
AdjustClock (Boolean which, int dir)
{
    if(appData.autoCallFlag) { DisplayError(_("Clock adjustment not allowed in auto-flag mode"), 0); return; }
    if(which) blackTimeRemaining += 60000*dir;
    else      whiteTimeRemaining += 60000*dir;
    DisplayBothClocks();
    adjustedClock = TRUE;
}

/* Stop clocks and reset to a fresh time control */
void
ResetClocks ()
{
    (void) StopClockTimer();
    if (appData.icsActive) {
        whiteTimeRemaining = blackTimeRemaining = 0;
    } else if (searchTime) {
        whiteTimeRemaining = 1000*searchTime / WhitePlayer()->timeOdds;
        blackTimeRemaining = 1000*searchTime / WhitePlayer()->other->timeOdds;
    } else { /* [HGM] correct new time quote for time odds */
        whiteTC = blackTC = fullTimeControlString;
        whiteTimeRemaining = GetTimeQuota(-1, 0, whiteTC) / WhitePlayer()->timeOdds;
        blackTimeRemaining = GetTimeQuota(-1, 0, blackTC) / WhitePlayer()->other->timeOdds;
    }
    if (whiteFlag || blackFlag) {
        DisplayTitle("");
        whiteFlag = blackFlag = FALSE;
    }
    lastWhite = lastBlack = whiteStartMove = blackStartMove = 0;
    DisplayBothClocks();
    adjustedClock = FALSE;
}

#define FUDGE 25 /* 25ms = 1/40 sec; should be plenty even for 50 Hz clocks */

/* Decrement running clock by amount of time that has passed */
void
DecrementClocks ()
{
    long timeRemaining;
    long lastTickLength, fudge;
    TimeMark now;

    if (!appData.clockMode) return;
    if (gameMode==AnalyzeMode || gameMode == AnalyzeFile) return;

    GetTimeMark(&now);

    lastTickLength = SubtractTimeMarks(&now, &tickStartTM);

    /* Fudge if we woke up a little too soon */
    fudge = intendedTickLength - lastTickLength;
    if (fudge < 0 || fudge > FUDGE) fudge = 0;

    if (WhiteOnMove(forwardMostMove)) {
        if(whiteNPS >= 0) lastTickLength = 0;
        timeRemaining = whiteTimeRemaining -= lastTickLength;
        if(timeRemaining < 0 && !appData.icsActive) {
            GetTimeQuota((forwardMostMove-whiteStartMove-1)/2, 0, whiteTC); // sets suddenDeath & nextSession;
            if(suddenDeath) { // [HGM] if we run out of a non-last incremental session, go to the next
                whiteStartMove = forwardMostMove; whiteTC = nextSession;
                lastWhite= timeRemaining = whiteTimeRemaining += GetTimeQuota(-1, 0, whiteTC);
            }
        }
        DisplayWhiteClock(whiteTimeRemaining - fudge,
                          WhiteOnMove(currentMove < forwardMostMove ? currentMove : forwardMostMove));
    } else {
        if(blackNPS >= 0) lastTickLength = 0;
        timeRemaining = blackTimeRemaining -= lastTickLength;
        if(timeRemaining < 0 && !appData.icsActive) { // [HGM] if we run out of a non-last incremental session, go to the next
            GetTimeQuota((forwardMostMove-blackStartMove-1)/2, 0, blackTC);
            if(suddenDeath) {
                blackStartMove = forwardMostMove;
                lastBlack = timeRemaining = blackTimeRemaining += GetTimeQuota(-1, 0, blackTC=nextSession);
            }
        }
        DisplayBlackClock(blackTimeRemaining - fudge,
                          !WhiteOnMove(currentMove < forwardMostMove ? currentMove : forwardMostMove));
    }
    if (CheckFlags()) return;

    tickStartTM = now;
    intendedTickLength = NextTickLength(timeRemaining - fudge) + fudge;
    StartClockTimer(intendedTickLength);

    /* if the time remaining has fallen below the alarm threshold, sound the
     * alarm. if the alarm has sounded and (due to a takeback or time control
     * with increment) the time remaining has increased to a level above the
     * threshold, reset the alarm so it can sound again.
     */

    if (appData.icsActive && appData.icsAlarm) {

        /* make sure we are dealing with the user's clock */
        if (!( ((gameMode == IcsPlayingWhite) && WhiteOnMove(currentMove)) ||
               ((gameMode == IcsPlayingBlack) && !WhiteOnMove(currentMove))
           )) return;

        if (alarmSounded && (timeRemaining > appData.icsAlarmTime)) {
            alarmSounded = FALSE;
        } else if (!alarmSounded && (timeRemaining <= appData.icsAlarmTime)) {
            PlayAlarmSound();
            alarmSounded = TRUE;
        }
    }
}


/* A player has just moved, so stop the previously running
   clock and (if in clock mode) start the other one.
   We redisplay both clocks in case we're in ICS mode, because
   ICS gives us an update to both clocks after every move.
   Note that this routine is called *after* forwardMostMove
   is updated, so the last fractional tick must be subtracted
   from the color that is *not* on move now.
*/
void
SwitchClocks (int newMoveNr)
{
    long lastTickLength;
    TimeMark now;
    int flagged = FALSE;

    GetTimeMark(&now);

    if (StopClockTimer() && appData.clockMode) {
        lastTickLength = SubtractTimeMarks(&now, &tickStartTM);
        if (!WhiteOnMove(forwardMostMove)) {
            if(blackNPS >= 0) lastTickLength = 0;
            blackTimeRemaining -= lastTickLength;
           /* [HGM] PGNtime: save time for PGN file if engine did not give it */
//         if(pvInfoList[forwardMostMove].time == -1)
                 pvInfoList[forwardMostMove].time =               // use GUI time
                      (timeRemaining[1][forwardMostMove-1] - blackTimeRemaining)/10;
        } else {
           if(whiteNPS >= 0) lastTickLength = 0;
           whiteTimeRemaining -= lastTickLength;
           /* [HGM] PGNtime: save time for PGN file if engine did not give it */
//         if(pvInfoList[forwardMostMove].time == -1)
                 pvInfoList[forwardMostMove].time =
                      (timeRemaining[0][forwardMostMove-1] - whiteTimeRemaining)/10;
        }
        flagged = CheckFlags();
    }
    forwardMostMove = newMoveNr; // [HGM] race: change stm when no timer interrupt scheduled
    CheckTimeControl();

    if (flagged || !appData.clockMode) return;

    switch (gameMode) {
      case MachinePlaysBlack:
      case MachinePlaysWhite:
      case BeginningOfGame:
        if (pausing) return;
        break;

      case EditGame:
      case PlayFromGameFile:
      case IcsExamining:
        return;

      default:
        break;
    }

    if (searchTime) { // [HGM] st: set clock of player that has to move to max time
        if(WhiteOnMove(forwardMostMove))
             whiteTimeRemaining = 1000*searchTime / WhitePlayer()->timeOdds;
        else blackTimeRemaining = 1000*searchTime / WhitePlayer()->other->timeOdds;
    }

    tickStartTM = now;
    intendedTickLength = NextTickLength(WhiteOnMove(forwardMostMove) ?
      whiteTimeRemaining : blackTimeRemaining);
    StartClockTimer(intendedTickLength);
}


/* Stop both clocks */
void
StopClocks ()
{
    long lastTickLength;
    TimeMark now;

    if (!StopClockTimer()) return;
    if (!appData.clockMode) return;

    GetTimeMark(&now);

    lastTickLength = SubtractTimeMarks(&now, &tickStartTM);
    if (WhiteOnMove(forwardMostMove)) {
        if(whiteNPS >= 0) lastTickLength = 0;
        whiteTimeRemaining -= lastTickLength;
        DisplayWhiteClock(whiteTimeRemaining, WhiteOnMove(currentMove));
    } else {
        if(blackNPS >= 0) lastTickLength = 0;
        blackTimeRemaining -= lastTickLength;
        DisplayBlackClock(blackTimeRemaining, !WhiteOnMove(currentMove));
    }
    CheckFlags();
}

/* Start clock of player on move.  Time may have been reset, so
   if clock is already running, stop and restart it. */
void
StartClocks ()
{
    (void) StopClockTimer(); /* in case it was running already */
    DisplayBothClocks();
    if (CheckFlags()) return;

    if (!appData.clockMode) return;
    if (gameMode == AnalyzeMode || gameMode == AnalyzeFile) return;

    GetTimeMark(&tickStartTM);
    intendedTickLength = NextTickLength(WhiteOnMove(forwardMostMove) ?
      whiteTimeRemaining : blackTimeRemaining);

   /* [HGM] nps: figure out nps factors, by determining which engine plays white and/or black once and for all */
    whiteNPS = blackNPS = -1;
    if(gameMode == MachinePlaysWhite || gameMode == TwoMachinesPlay && first.twoMachinesColor[0] == 'w'
       || appData.zippyPlay && gameMode == IcsPlayingBlack) // first (perhaps only) engine has white
        whiteNPS = first.nps;
    if(gameMode == MachinePlaysBlack || gameMode == TwoMachinesPlay && first.twoMachinesColor[0] == 'b'
       || appData.zippyPlay && gameMode == IcsPlayingWhite) // first (perhaps only) engine has black
        blackNPS = first.nps;
    if(gameMode == TwoMachinesPlay && first.twoMachinesColor[0] == 'b') // second only used in Two-Machines mode
        whiteNPS = second.nps;
    if(gameMode == TwoMachinesPlay && first.twoMachinesColor[0] == 'w')
        blackNPS = second.nps;
    if(appData.debugMode) fprintf(debugFP, "nps: w=%d, b=%d\n", whiteNPS, blackNPS);

    StartClockTimer(intendedTickLength);
}

char *
TimeString (long ms)
{
    long second, minute, hour, day;
    char *sign = "";
    static char buf[32];

    if (ms > 0 && ms <= 9900) {
      /* convert milliseconds to tenths, rounding up */
      double tenths = floor( ((double)(ms + 99L)) / 100.00 );

      snprintf(buf,sizeof(buf)/sizeof(buf[0]), " %03.1f ", tenths/10.0);
      return buf;
    }

    /* convert milliseconds to seconds, rounding up */
    /* use floating point to avoid strangeness of integer division
       with negative dividends on many machines */
    second = (long) floor(((double) (ms + 999L)) / 1000.0);

    if (second < 0) {
        sign = "-";
        second = -second;
    }

    day = second / (60 * 60 * 24);
    second = second % (60 * 60 * 24);
    hour = second / (60 * 60);
    second = second % (60 * 60);
    minute = second / 60;
    second = second % 60;

    if (day > 0)
      snprintf(buf, sizeof(buf)/sizeof(buf[0]), " %s%ld:%02ld:%02ld:%02ld ",
              sign, day, hour, minute, second);
    else if (hour > 0)
      snprintf(buf, sizeof(buf)/sizeof(buf[0]), " %s%ld:%02ld:%02ld ", sign, hour, minute, second);
    else
      snprintf(buf, sizeof(buf)/sizeof(buf[0]), " %s%2ld:%02ld ", sign, minute, second);

    return buf;
}


/*
 * This is necessary because some C libraries aren't ANSI C compliant yet.
 */
char *
StrStr (char *string, char *match)
{
    int i, length;

    length = strlen(match);

    for (i = strlen(string) - length; i >= 0; i--, string++)
      if (!strncmp(match, string, length))
        return string;

    return NULL;
}

char *
StrCaseStr (char *string, char *match)
{
    int i, j, length;

    length = strlen(match);

    for (i = strlen(string) - length; i >= 0; i--, string++) {
        for (j = 0; j < length; j++) {
            if (ToLower(match[j]) != ToLower(string[j]))
              break;
        }
        if (j == length) return string;
    }

    return NULL;
}

#ifndef _amigados
int
StrCaseCmp (char *s1, char *s2)
{
    char c1, c2;

    for (;;) {
        c1 = ToLower(*s1++);
        c2 = ToLower(*s2++);
        if (c1 > c2) return 1;
        if (c1 < c2) return -1;
        if (c1 == NULLCHAR) return 0;
    }
}


int
ToLower (int c)
{
    return isupper(c) ? tolower(c) : c;
}


int
ToUpper (int c)
{
    return islower(c) ? toupper(c) : c;
}
#endif /* !_amigados    */

char *
StrSave (char *s)
{
  char *ret;

  if ((ret = (char *) malloc(strlen(s) + 1)))
    {
      safeStrCpy(ret, s, strlen(s)+1);
    }
  return ret;
}

char *
StrSavePtr (char *s, char **savePtr)
{
    if (*savePtr) {
        free(*savePtr);
    }
    if ((*savePtr = (char *) malloc(strlen(s) + 1))) {
      safeStrCpy(*savePtr, s, strlen(s)+1);
    }
    return(*savePtr);
}

char *
PGNDate ()
{
    time_t clock;
    struct tm *tm;
    char buf[MSG_SIZ];

    clock = time((time_t *)NULL);
    tm = localtime(&clock);
    snprintf(buf, MSG_SIZ, "%04d.%02d.%02d",
            tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday);
    return StrSave(buf);
}


char *
PositionToFEN (int move, char *overrideCastling)
{
    int i, j, fromX, fromY, toX, toY;
    int whiteToPlay;
    char buf[MSG_SIZ];
    char *p, *q;
    int emptycount;
    ChessSquare piece;

    whiteToPlay = (gameMode == EditPosition) ?
      !blackPlaysFirst : (move % 2 == 0);
    p = buf;

    /* Piece placement data */
    for (i = BOARD_HEIGHT - 1; i >= 0; i--) {
        if(MSG_SIZ - (p - buf) < BOARD_RGHT - BOARD_LEFT + 20) { *p = 0; return StrSave(buf); }
        emptycount = 0;
        for (j = BOARD_LEFT; j < BOARD_RGHT; j++) {
            if (boards[move][i][j] == EmptySquare) {
                emptycount++;
            } else { ChessSquare piece = boards[move][i][j];
                if (emptycount > 0) {
                    if(emptycount<10) /* [HGM] can be >= 10 */
                        *p++ = '0' + emptycount;
                    else { *p++ = '0' + emptycount/10; *p++ = '0' + emptycount%10; }
                    emptycount = 0;
                }
                if(PieceToChar(piece) == '+') {
                    /* [HGM] write promoted pieces as '+<unpromoted>' (Shogi) */
                    *p++ = '+';
                    piece = (ChessSquare)(DEMOTED piece);
                }
                *p++ = PieceToChar(piece);
                if(p[-1] == '~') {
                    /* [HGM] flag promoted pieces as '<promoted>~' (Crazyhouse) */
                    p[-1] = PieceToChar((ChessSquare)(DEMOTED piece));
                    *p++ = '~';
                }
            }
        }
        if (emptycount > 0) {
            if(emptycount<10) /* [HGM] can be >= 10 */
                *p++ = '0' + emptycount;
            else { *p++ = '0' + emptycount/10; *p++ = '0' + emptycount%10; }
            emptycount = 0;
        }
        *p++ = '/';
    }
    *(p - 1) = ' ';

    /* [HGM] print Crazyhouse or Shogi holdings */
    if( gameInfo.holdingsWidth ) {
        *(p-1) = '['; /* if we wanted to support BFEN, this could be '/' */
        q = p;
        for(i=0; i<gameInfo.holdingsSize; i++) { /* white holdings */
            piece = boards[move][i][BOARD_WIDTH-1];
            if( piece != EmptySquare )
              for(j=0; j<(int) boards[move][i][BOARD_WIDTH-2]; j++)
                  *p++ = PieceToChar(piece);
        }
        for(i=0; i<gameInfo.holdingsSize; i++) { /* black holdings */
            piece = boards[move][BOARD_HEIGHT-i-1][0];
            if( piece != EmptySquare )
              for(j=0; j<(int) boards[move][BOARD_HEIGHT-i-1][1]; j++)
                  *p++ = PieceToChar(piece);
        }

        if( q == p ) *p++ = '-';
        *p++ = ']';
        *p++ = ' ';
    }

    /* Active color */
    *p++ = whiteToPlay ? 'w' : 'b';
    *p++ = ' ';

  if(q = overrideCastling) { // [HGM] FRC: override castling & e.p fields for non-compliant engines
    while(*p++ = *q++); if(q != overrideCastling+1) p[-1] = ' '; else --p;
  } else {
  if(nrCastlingRights) {
     q = p;
     if(gameInfo.variant == VariantFischeRandom || gameInfo.variant == VariantCapaRandom) {
       /* [HGM] write directly from rights */
           if(boards[move][CASTLING][2] != NoRights &&
              boards[move][CASTLING][0] != NoRights   )
                *p++ = boards[move][CASTLING][0] + AAA + 'A' - 'a';
           if(boards[move][CASTLING][2] != NoRights &&
              boards[move][CASTLING][1] != NoRights   )
                *p++ = boards[move][CASTLING][1] + AAA + 'A' - 'a';
           if(boards[move][CASTLING][5] != NoRights &&
              boards[move][CASTLING][3] != NoRights   )
                *p++ = boards[move][CASTLING][3] + AAA;
           if(boards[move][CASTLING][5] != NoRights &&
              boards[move][CASTLING][4] != NoRights   )
                *p++ = boards[move][CASTLING][4] + AAA;
     } else {

        /* [HGM] write true castling rights */
        if( nrCastlingRights == 6 ) {
            if(boards[move][CASTLING][0] == BOARD_RGHT-1 &&
               boards[move][CASTLING][2] != NoRights  ) *p++ = 'K';
            if(boards[move][CASTLING][1] == BOARD_LEFT &&
               boards[move][CASTLING][2] != NoRights  ) *p++ = 'Q';
            if(boards[move][CASTLING][3] == BOARD_RGHT-1 &&
               boards[move][CASTLING][5] != NoRights  ) *p++ = 'k';
            if(boards[move][CASTLING][4] == BOARD_LEFT &&
               boards[move][CASTLING][5] != NoRights  ) *p++ = 'q';
        }
     }
     if (q == p) *p++ = '-'; /* No castling rights */
     *p++ = ' ';
  }

  if(gameInfo.variant != VariantShogi    && gameInfo.variant != VariantXiangqi &&
     gameInfo.variant != VariantShatranj && gameInfo.variant != VariantCourier && gameInfo.variant != VariantMakruk ) {
    /* En passant target square */
    if (move > backwardMostMove) {
        fromX = moveList[move - 1][0] - AAA;
        fromY = moveList[move - 1][1] - ONE;
        toX = moveList[move - 1][2] - AAA;
        toY = moveList[move - 1][3] - ONE;
        if (fromY == (whiteToPlay ? BOARD_HEIGHT-2 : 1) &&
            toY == (whiteToPlay ? BOARD_HEIGHT-4 : 3) &&
            boards[move][toY][toX] == (whiteToPlay ? BlackPawn : WhitePawn) &&
            fromX == toX) {
            /* 2-square pawn move just happened */
            *p++ = toX + AAA;
            *p++ = whiteToPlay ? '6'+BOARD_HEIGHT-8 : '3';
        } else {
            *p++ = '-';
        }
    } else if(move == backwardMostMove) {
        // [HGM] perhaps we should always do it like this, and forget the above?
        if((signed char)boards[move][EP_STATUS] >= 0) {
            *p++ = boards[move][EP_STATUS] + AAA;
            *p++ = whiteToPlay ? '6'+BOARD_HEIGHT-8 : '3';
        } else {
            *p++ = '-';
        }
    } else {
        *p++ = '-';
    }
    *p++ = ' ';
  }
  }

    /* [HGM] find reversible plies */
    {   int i = 0, j=move;

        if (appData.debugMode) { int k;
            fprintf(debugFP, "write FEN 50-move: %d %d %d\n", initialRulePlies, forwardMostMove, backwardMostMove);
            for(k=backwardMostMove; k<=forwardMostMove; k++)
                fprintf(debugFP, "e%d. p=%d\n", k, (signed char)boards[k][EP_STATUS]);

        }

        while(j > backwardMostMove && (signed char)boards[j][EP_STATUS] <= EP_NONE) j--,i++;
        if( j == backwardMostMove ) i += initialRulePlies;
        sprintf(p, "%d ", i);
        p += i>=100 ? 4 : i >= 10 ? 3 : 2;
    }
    /* Fullmove number */
    sprintf(p, "%d", (move / 2) + 1);

    return StrSave(buf);
}

Boolean
ParseFEN (Board board, int *blackPlaysFirst, char *fen)
{
    int i, j;
    char *p, c;
    int emptycount;
    ChessSquare piece;

    p = fen;

    /* [HGM] by default clear Crazyhouse holdings, if present */
    if(gameInfo.holdingsWidth) {
       for(i=0; i<BOARD_HEIGHT; i++) {
           board[i][0]             = EmptySquare; /* black holdings */
           board[i][BOARD_WIDTH-1] = EmptySquare; /* white holdings */
           board[i][1]             = (ChessSquare) 0; /* black counts */
           board[i][BOARD_WIDTH-2] = (ChessSquare) 0; /* white counts */
       }
    }

    /* Piece placement data */
    for (i = BOARD_HEIGHT - 1; i >= 0; i--) {
        j = 0;
        for (;;) {
            if (*p == '/' || *p == ' ' || (*p == '[' && i == 0) ) {
                if (*p == '/') p++;
                emptycount = gameInfo.boardWidth - j;
                while (emptycount--)
                        board[i][(j++)+gameInfo.holdingsWidth] = EmptySquare;
                break;
#if(BOARD_FILES >= 10)
            } else if(*p=='x' || *p=='X') { /* [HGM] X means 10 */
                p++; emptycount=10;
                if (j + emptycount > gameInfo.boardWidth) return FALSE;
                while (emptycount--)
                        board[i][(j++)+gameInfo.holdingsWidth] = EmptySquare;
#endif
            } else if (isdigit(*p)) {
                emptycount = *p++ - '0';
                while(isdigit(*p)) emptycount = 10*emptycount + *p++ - '0'; /* [HGM] allow > 9 */
                if (j + emptycount > gameInfo.boardWidth) return FALSE;
                while (emptycount--)
                        board[i][(j++)+gameInfo.holdingsWidth] = EmptySquare;
            } else if (*p == '+' || isalpha(*p)) {
                if (j >= gameInfo.boardWidth) return FALSE;
                if(*p=='+') {
                    piece = CharToPiece(*++p);
                    if(piece == EmptySquare) return FALSE; /* unknown piece */
                    piece = (ChessSquare) (PROMOTED piece ); p++;
                    if(PieceToChar(piece) != '+') return FALSE; /* unpromotable piece */
                } else piece = CharToPiece(*p++);

                if(piece==EmptySquare) return FALSE; /* unknown piece */
                if(*p == '~') { /* [HGM] make it a promoted piece for Crazyhouse */
                    piece = (ChessSquare) (PROMOTED piece);
                    if(PieceToChar(piece) != '~') return FALSE; /* cannot be a promoted piece */
                    p++;
                }
                board[i][(j++)+gameInfo.holdingsWidth] = piece;
            } else {
                return FALSE;
            }
        }
    }
    while (*p == '/' || *p == ' ') p++;

    /* [HGM] look for Crazyhouse holdings here */
    while(*p==' ') p++;
    if( gameInfo.holdingsWidth && p[-1] == '/' || *p == '[') {
        if(*p == '[') p++;
        if(*p == '-' ) p++; /* empty holdings */ else {
            if( !gameInfo.holdingsWidth ) return FALSE; /* no room to put holdings! */
            /* if we would allow FEN reading to set board size, we would   */
            /* have to add holdings and shift the board read so far here   */
            while( (piece = CharToPiece(*p) ) != EmptySquare ) {
                p++;
                if((int) piece >= (int) BlackPawn ) {
                    i = (int)piece - (int)BlackPawn;
                    i = PieceToNumber((ChessSquare)i);
                    if( i >= gameInfo.holdingsSize ) return FALSE;
                    board[BOARD_HEIGHT-1-i][0] = piece; /* black holdings */
                    board[BOARD_HEIGHT-1-i][1]++;       /* black counts   */
                } else {
                    i = (int)piece - (int)WhitePawn;
                    i = PieceToNumber((ChessSquare)i);
                    if( i >= gameInfo.holdingsSize ) return FALSE;
                    board[i][BOARD_WIDTH-1] = piece;    /* white holdings */
                    board[i][BOARD_WIDTH-2]++;          /* black holdings */
                }
            }
        }
        if(*p == ']') p++;
    }

    while(*p == ' ') p++;

    /* Active color */
    c = *p++;
    if(appData.colorNickNames) {
      if( c == appData.colorNickNames[0] ) c = 'w'; else
      if( c == appData.colorNickNames[1] ) c = 'b';
    }
    switch (c) {
      case 'w':
        *blackPlaysFirst = FALSE;
        break;
      case 'b':
        *blackPlaysFirst = TRUE;
        break;
      default:
        return FALSE;
    }

    /* [HGM] We NO LONGER ignore the rest of the FEN notation */
    /* return the extra info in global variiables             */

    /* set defaults in case FEN is incomplete */
    board[EP_STATUS] = EP_UNKNOWN;
    for(i=0; i<nrCastlingRights; i++ ) {
        board[CASTLING][i] =
            gameInfo.variant == VariantFischeRandom || gameInfo.variant == VariantCapaRandom ? NoRights : initialRights[i];
    }   /* assume possible unless obviously impossible */
    if(initialRights[0]!=NoRights && board[castlingRank[0]][initialRights[0]] != WhiteRook) board[CASTLING][0] = NoRights;
    if(initialRights[1]!=NoRights && board[castlingRank[1]][initialRights[1]] != WhiteRook) board[CASTLING][1] = NoRights;
    if(initialRights[2]!=NoRights && board[castlingRank[2]][initialRights[2]] != WhiteUnicorn
                                  && board[castlingRank[2]][initialRights[2]] != WhiteKing) board[CASTLING][2] = NoRights;
    if(initialRights[3]!=NoRights && board[castlingRank[3]][initialRights[3]] != BlackRook) board[CASTLING][3] = NoRights;
    if(initialRights[4]!=NoRights && board[castlingRank[4]][initialRights[4]] != BlackRook) board[CASTLING][4] = NoRights;
    if(initialRights[5]!=NoRights && board[castlingRank[5]][initialRights[5]] != BlackUnicorn
                                  && board[castlingRank[5]][initialRights[5]] != BlackKing) board[CASTLING][5] = NoRights;
    FENrulePlies = 0;

    while(*p==' ') p++;
    if(nrCastlingRights) {
      if(*p=='K' || *p=='Q' || *p=='k' || *p=='q' || *p=='-') {
          /* castling indicator present, so default becomes no castlings */
          for(i=0; i<nrCastlingRights; i++ ) {
                 board[CASTLING][i] = NoRights;
          }
      }
      while(*p=='K' || *p=='Q' || *p=='k' || *p=='q' || *p=='-' ||
             (gameInfo.variant == VariantFischeRandom || gameInfo.variant == VariantCapaRandom) &&
             ( *p >= 'a' && *p < 'a' + gameInfo.boardWidth) ||
             ( *p >= 'A' && *p < 'A' + gameInfo.boardWidth)   ) {
        char c = *p++; int whiteKingFile=NoRights, blackKingFile=NoRights;

        for(i=BOARD_LEFT; i<BOARD_RGHT; i++) {
            if(board[BOARD_HEIGHT-1][i] == BlackKing) blackKingFile = i;
            if(board[0             ][i] == WhiteKing) whiteKingFile = i;
        }
        if(gameInfo.variant == VariantTwoKings || gameInfo.variant == VariantKnightmate)
            whiteKingFile = blackKingFile = BOARD_WIDTH >> 1; // for these variant scanning fails
        if(whiteKingFile == NoRights || board[0][whiteKingFile] != WhiteUnicorn
                                     && board[0][whiteKingFile] != WhiteKing) whiteKingFile = NoRights;
        if(blackKingFile == NoRights || board[BOARD_HEIGHT-1][blackKingFile] != BlackUnicorn
                                     && board[BOARD_HEIGHT-1][blackKingFile] != BlackKing) blackKingFile = NoRights;
        switch(c) {
          case'K':
              for(i=BOARD_RGHT-1; board[0][i]!=WhiteRook && i>whiteKingFile; i--);
              board[CASTLING][0] = i != whiteKingFile ? i : NoRights;
              board[CASTLING][2] = whiteKingFile;
              break;
          case'Q':
              for(i=BOARD_LEFT;  i<BOARD_RGHT && board[0][i]!=WhiteRook && i<whiteKingFile; i++);
              board[CASTLING][1] = i != whiteKingFile ? i : NoRights;
              board[CASTLING][2] = whiteKingFile;
              break;
          case'k':
              for(i=BOARD_RGHT-1; board[BOARD_HEIGHT-1][i]!=BlackRook && i>blackKingFile; i--);
              board[CASTLING][3] = i != blackKingFile ? i : NoRights;
              board[CASTLING][5] = blackKingFile;
              break;
          case'q':
              for(i=BOARD_LEFT; i<BOARD_RGHT && board[BOARD_HEIGHT-1][i]!=BlackRook && i<blackKingFile; i++);
              board[CASTLING][4] = i != blackKingFile ? i : NoRights;
              board[CASTLING][5] = blackKingFile;
          case '-':
              break;
          default: /* FRC castlings */
              if(c >= 'a') { /* black rights */
                  for(i=BOARD_LEFT; i<BOARD_RGHT; i++)
                    if(board[BOARD_HEIGHT-1][i] == BlackKing) break;
                  if(i == BOARD_RGHT) break;
                  board[CASTLING][5] = i;
                  c -= AAA;
                  if(board[BOARD_HEIGHT-1][c] <  BlackPawn ||
                     board[BOARD_HEIGHT-1][c] >= BlackKing   ) break;
                  if(c > i)
                      board[CASTLING][3] = c;
                  else
                      board[CASTLING][4] = c;
              } else { /* white rights */
                  for(i=BOARD_LEFT; i<BOARD_RGHT; i++)
                    if(board[0][i] == WhiteKing) break;
                  if(i == BOARD_RGHT) break;
                  board[CASTLING][2] = i;
                  c -= AAA - 'a' + 'A';
                  if(board[0][c] >= WhiteKing) break;
                  if(c > i)
                      board[CASTLING][0] = c;
                  else
                      board[CASTLING][1] = c;
              }
        }
      }
      for(i=0; i<nrCastlingRights; i++)
        if(board[CASTLING][i] != NoRights) initialRights[i] = board[CASTLING][i];
    if (appData.debugMode) {
        fprintf(debugFP, "FEN castling rights:");
        for(i=0; i<nrCastlingRights; i++)
        fprintf(debugFP, " %d", board[CASTLING][i]);
        fprintf(debugFP, "\n");
    }

      while(*p==' ') p++;
    }

    /* read e.p. field in games that know e.p. capture */
    if(gameInfo.variant != VariantShogi    && gameInfo.variant != VariantXiangqi &&
       gameInfo.variant != VariantShatranj && gameInfo.variant != VariantCourier && gameInfo.variant != VariantMakruk ) {
      if(*p=='-') {
        p++; board[EP_STATUS] = EP_NONE;
      } else {
         char c = *p++ - AAA;

         if(c < BOARD_LEFT || c >= BOARD_RGHT) return TRUE;
         if(*p >= '0' && *p <='9') p++;
         board[EP_STATUS] = c;
      }
    }


    if(sscanf(p, "%d", &i) == 1) {
        FENrulePlies = i; /* 50-move ply counter */
        /* (The move number is still ignored)    */
    }

    return TRUE;
}

void
EditPositionPasteFEN (char *fen)
{
  if (fen != NULL) {
    Board initial_position;

    if (!ParseFEN(initial_position, &blackPlaysFirst, fen)) {
      DisplayError(_("Bad FEN position in clipboard"), 0);
      return ;
    } else {
      int savedBlackPlaysFirst = blackPlaysFirst;
      EditPositionEvent();
      blackPlaysFirst = savedBlackPlaysFirst;
      CopyBoard(boards[0], initial_position);
      initialRulePlies = FENrulePlies; /* [HGM] copy FEN attributes as well */
      EditPositionDone(FALSE); // [HGM] fake: do not fake rights if we had FEN
      DisplayBothClocks();
      DrawPosition(FALSE, boards[currentMove]);
    }
  }
}

static char cseq[12] = "\\   ";

Boolean
set_cont_sequence (char *new_seq)
{
    int len;
    Boolean ret;

    // handle bad attempts to set the sequence
        if (!new_seq)
                return 0; // acceptable error - no debug

    len = strlen(new_seq);
    ret = (len > 0) && (len < sizeof(cseq));
    if (ret)
      safeStrCpy(cseq, new_seq, sizeof(cseq)/sizeof(cseq[0]));
    else if (appData.debugMode)
      fprintf(debugFP, "Invalid continuation sequence \"%s\"  (maximum length is: %u)\n", new_seq, (unsigned) sizeof(cseq)-1);
    return ret;
}

/*
    reformat a source message so words don't cross the width boundary.  internal
    newlines are not removed.  returns the wrapped size (no null character unless
    included in source message).  If dest is NULL, only calculate the size required
    for the dest buffer.  lp argument indicats line position upon entry, and it's
    passed back upon exit.
*/
int
wrap (char *dest, char *src, int count, int width, int *lp)
{
    int len, i, ansi, cseq_len, line, old_line, old_i, old_len, clen;

    cseq_len = strlen(cseq);
    old_line = line = *lp;
    ansi = len = clen = 0;

    for (i=0; i < count; i++)
    {
        if (src[i] == '\033')
            ansi = 1;

        // if we hit the width, back up
        if (!ansi && (line >= width) && src[i] != '\n' && src[i] != ' ')
        {
            // store i & len in case the word is too long
            old_i = i, old_len = len;

            // find the end of the last word
            while (i && src[i] != ' ' && src[i] != '\n')
            {
                i--;
                len--;
            }

            // word too long?  restore i & len before splitting it
            if ((old_i-i+clen) >= width)
            {
                i = old_i;
                len = old_len;
            }

            // extra space?
            if (i && src[i-1] == ' ')
                len--;

            if (src[i] != ' ' && src[i] != '\n')
            {
                i--;
                if (len)
                    len--;
            }

            // now append the newline and continuation sequence
            if (dest)
                dest[len] = '\n';
            len++;
            if (dest)
                strncpy(dest+len, cseq, cseq_len);
            len += cseq_len;
            line = cseq_len;
            clen = cseq_len;
            continue;
        }

        if (dest)
            dest[len] = src[i];
        len++;
        if (!ansi)
            line++;
        if (src[i] == '\n')
            line = 0;
        if (src[i] == 'm')
            ansi = 0;
    }
    if (dest && appData.debugMode)
    {
        fprintf(debugFP, "wrap(count:%d,width:%d,line:%d,len:%d,*lp:%d,src: ",
            count, width, line, len, *lp);
        show_bytes(debugFP, src, count);
        fprintf(debugFP, "\ndest: ");
        show_bytes(debugFP, dest, len);
        fprintf(debugFP, "\n");
    }
    *lp = dest ? line : old_line;

    return len;
}

// [HGM] vari: routines for shelving variations
Boolean modeRestore = FALSE;

void
PushInner (int firstMove, int lastMove)
{
        int i, j, nrMoves = lastMove - firstMove;

        // push current tail of game on stack
        savedResult[storedGames] = gameInfo.result;
        savedDetails[storedGames] = gameInfo.resultDetails;
        gameInfo.resultDetails = NULL;
        savedFirst[storedGames] = firstMove;
        savedLast [storedGames] = lastMove;
        savedFramePtr[storedGames] = framePtr;
        framePtr -= nrMoves; // reserve space for the boards
        for(i=nrMoves; i>=1; i--) { // copy boards to stack, working downwards, in case of overlap
            CopyBoard(boards[framePtr+i], boards[firstMove+i]);
            for(j=0; j<MOVE_LEN; j++)
                moveList[framePtr+i][j] = moveList[firstMove+i-1][j];
            for(j=0; j<2*MOVE_LEN; j++)
                parseList[framePtr+i][j] = parseList[firstMove+i-1][j];
            timeRemaining[0][framePtr+i] = timeRemaining[0][firstMove+i];
            timeRemaining[1][framePtr+i] = timeRemaining[1][firstMove+i];
            pvInfoList[framePtr+i] = pvInfoList[firstMove+i-1];
            pvInfoList[firstMove+i-1].depth = 0;
            commentList[framePtr+i] = commentList[firstMove+i];
            commentList[firstMove+i] = NULL;
        }

        storedGames++;
        forwardMostMove = firstMove; // truncate game so we can start variation
}

void
PushTail (int firstMove, int lastMove)
{
        if(appData.icsActive) { // only in local mode
                forwardMostMove = currentMove; // mimic old ICS behavior
                return;
        }
        if(storedGames >= MAX_VARIATIONS-2) return; // leave one for PV-walk

        PushInner(firstMove, lastMove);
        if(storedGames == 1) GreyRevert(FALSE);
        if(gameMode == PlayFromGameFile) gameMode = EditGame, modeRestore = TRUE;
}

void
PopInner (Boolean annotate)
{
        int i, j, nrMoves;
        char buf[8000], moveBuf[20];

        ToNrEvent(savedFirst[storedGames-1]); // sets currentMove
        storedGames--; // do this after ToNrEvent, to make sure HistorySet will refresh entire game after PopInner returns
        nrMoves = savedLast[storedGames] - currentMove;
        if(annotate) {
                int cnt = 10;
                if(!WhiteOnMove(currentMove))
                  snprintf(buf, sizeof(buf)/sizeof(buf[0]),"(%d...", (currentMove+2)>>1);
                else safeStrCpy(buf, "(", sizeof(buf)/sizeof(buf[0]));
                for(i=currentMove; i<forwardMostMove; i++) {
                        if(WhiteOnMove(i))
                          snprintf(moveBuf, sizeof(moveBuf)/sizeof(moveBuf[0]), " %d. %s", (i+2)>>1, SavePart(parseList[i]));
                        else snprintf(moveBuf, sizeof(moveBuf)/sizeof(moveBuf[0])," %s", SavePart(parseList[i]));
                        strcat(buf, moveBuf);
                        if(commentList[i]) { strcat(buf, " "); strcat(buf, commentList[i]); }
                        if(!--cnt) { strcat(buf, "\n"); cnt = 10; }
                }
                strcat(buf, ")");
        }
        for(i=1; i<=nrMoves; i++) { // copy last variation back
            CopyBoard(boards[currentMove+i], boards[framePtr+i]);
            for(j=0; j<MOVE_LEN; j++)
                moveList[currentMove+i-1][j] = moveList[framePtr+i][j];
            for(j=0; j<2*MOVE_LEN; j++)
                parseList[currentMove+i-1][j] = parseList[framePtr+i][j];
            timeRemaining[0][currentMove+i] = timeRemaining[0][framePtr+i];
            timeRemaining[1][currentMove+i] = timeRemaining[1][framePtr+i];
            pvInfoList[currentMove+i-1] = pvInfoList[framePtr+i];
            if(commentList[currentMove+i]) free(commentList[currentMove+i]);
            commentList[currentMove+i] = commentList[framePtr+i];
            commentList[framePtr+i] = NULL;
        }
        if(annotate) AppendComment(currentMove+1, buf, FALSE);
        framePtr = savedFramePtr[storedGames];
        gameInfo.result = savedResult[storedGames];
        if(gameInfo.resultDetails != NULL) {
            free(gameInfo.resultDetails);
      }
        gameInfo.resultDetails = savedDetails[storedGames];
        forwardMostMove = currentMove + nrMoves;
}

Boolean
PopTail (Boolean annotate)
{
        if(appData.icsActive) return FALSE; // only in local mode
        if(!storedGames) return FALSE; // sanity
        CommentPopDown(); // make sure no stale variation comments to the destroyed line can remain open

        PopInner(annotate);
        if(currentMove < forwardMostMove) ForwardEvent(); else
        HistorySet(parseList, backwardMostMove, forwardMostMove, currentMove-1);

        if(storedGames == 0) { GreyRevert(TRUE); if(modeRestore) modeRestore = FALSE, gameMode = PlayFromGameFile; }
        return TRUE;
}

void
CleanupTail ()
{       // remove all shelved variations
        int i;
        for(i=0; i<storedGames; i++) {
            if(savedDetails[i])
                free(savedDetails[i]);
            savedDetails[i] = NULL;
        }
        for(i=framePtr; i<MAX_MOVES; i++) {
                if(commentList[i]) free(commentList[i]);
                commentList[i] = NULL;
        }
        framePtr = MAX_MOVES-1;
        storedGames = 0;
}

void
LoadVariation (int index, char *text)
{       // [HGM] vari: shelve previous line and load new variation, parsed from text around text[index]
        char *p = text, *start = NULL, *end = NULL, wait = NULLCHAR;
        int level = 0, move;

        if(gameMode != EditGame && gameMode != AnalyzeMode && gameMode != PlayFromGameFile) return;
        // first find outermost bracketing variation
        while(*p) { // hope I got this right... Non-nesting {} and [] can screen each other and nesting ()
            if(!wait) { // while inside [] pr {}, ignore everyting except matching closing ]}
                if(*p == '{') wait = '}'; else
                if(*p == '[') wait = ']'; else
                if(*p == '(' && level++ == 0 && p-text < index) start = p+1;
                if(*p == ')' && level > 0 && --level == 0 && p-text > index && end == NULL) end = p-1;
            }
            if(*p == wait) wait = NULLCHAR; // closing ]} found
            p++;
        }
        if(!start || !end) return; // no variation found, or syntax error in PGN: ignore click
        if(appData.debugMode) fprintf(debugFP, "at move %d load variation '%s'\n", currentMove, start);
        end[1] = NULLCHAR; // clip off comment beyond variation
        ToNrEvent(currentMove-1);
        PushTail(currentMove, forwardMostMove); // shelve main variation. This truncates game
        // kludge: use ParsePV() to append variation to game
        move = currentMove;
        ParsePV(start, TRUE, TRUE);
        forwardMostMove = endPV; endPV = -1; currentMove = move; // cleanup what ParsePV did
        ClearPremoveHighlights();
        CommentPopDown();
        ToNrEvent(currentMove+1);
}