/*
* moves.c - Move generation and checking
- * $Id$
*
- * Copyright 1991 by Digital Equipment Corporation, Maynard, Massachusetts.
- * Enhancements Copyright 1992-95 Free Software Foundation, Inc.
+ * Copyright 1991 by Digital Equipment Corporation, Maynard,
+ * Massachusetts.
+ *
+ * Enhancements Copyright 1992-2001, 2002, 2003, 2004, 2005, 2006,
+ * 2007, 2008, 2009 Free Software Foundation, Inc.
+ *
+ * Enhancements Copyright 2005 Alessandro Scotti
*
* The following terms apply to Digital Equipment Corporation's copyright
* interest in XBoard:
* SOFTWARE.
* ------------------------------------------------------------------------
*
- * The following terms apply to the enhanced version of XBoard distributed
- * by the Free Software Foundation:
+ * The following terms apply to the enhanced version of XBoard
+ * distributed by the Free Software Foundation:
* ------------------------------------------------------------------------
- * This program is free software; you can redistribute it and/or modify
+ *
+ * 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 2 of the License, or
- * (at your option) any later version.
+ * the Free Software Foundation, either version 3 of the License, or (at
+ * your option) any later version.
*
- * This program 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.
+ * 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, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- * ------------------------------------------------------------------------
- */
+ * along with this program. If not, see http://www.gnu.org/licenses/. *
+ *
+ *------------------------------------------------------------------------
+ ** See the file ChangeLog for a revision history. */
#include "config.h"
int WhitePiece P((ChessSquare));
int BlackPiece P((ChessSquare));
int SameColor P((ChessSquare, ChessSquare));
+int PosFlags(int index);
+
+extern signed char initialRights[BOARD_SIZE]; /* [HGM] all rights enabled, set in InitPosition */
int WhitePiece(piece)
ChessSquare piece;
{
- return (int) piece >= (int) WhitePawn && (int) piece <= (int) WhiteKing;
+ return (int) piece >= (int) WhitePawn && (int) piece < (int) BlackPawn;
}
int BlackPiece(piece)
ChessSquare piece;
{
- return (int) piece >= (int) BlackPawn && (int) piece <= (int) BlackKing;
+ return (int) piece >= (int) BlackPawn && (int) piece < (int) EmptySquare;
}
int SameColor(piece1, piece2)
ChessSquare piece1, piece2;
{
- return ((int) piece1 >= (int) WhitePawn &&
- (int) piece1 <= (int) WhiteKing &&
+ return ((int) piece1 >= (int) WhitePawn && /* [HGM] can be > King ! */
+ (int) piece1 < (int) BlackPawn &&
(int) piece2 >= (int) WhitePawn &&
- (int) piece2 <= (int) WhiteKing)
+ (int) piece2 < (int) BlackPawn)
|| ((int) piece1 >= (int) BlackPawn &&
- (int) piece1 <= (int) BlackKing &&
+ (int) piece1 < (int) EmptySquare &&
(int) piece2 >= (int) BlackPawn &&
- (int) piece2 <= (int) BlackKing);
+ (int) piece2 < (int) EmptySquare);
}
ChessSquare PromoPiece(moveType)
return WhiteKing;
case BlackPromotionKing:
return BlackKing;
- }
-}
-
-ChessMove PromoCharToMoveType(whiteOnMove, promoChar)
- int whiteOnMove;
- int promoChar;
-{
- if (whiteOnMove) {
- switch (promoChar) {
- case 'n':
- case 'N':
- return WhitePromotionKnight;
- case 'b':
- case 'B':
- return WhitePromotionBishop;
- case 'r':
- case 'R':
- return WhitePromotionRook;
- case 'q':
- case 'Q':
- return WhitePromotionQueen;
- case 'k':
- case 'K':
- return WhitePromotionKing;
- case NULLCHAR:
- default:
- return NormalMove;
- }
- } else {
- switch (promoChar) {
- case 'n':
- case 'N':
- return BlackPromotionKnight;
- case 'b':
- case 'B':
- return BlackPromotionBishop;
- case 'r':
- case 'R':
- return BlackPromotionRook;
- case 'q':
- case 'Q':
- return BlackPromotionQueen;
- case 'k':
- case 'K':
- return BlackPromotionKing;
- case NULLCHAR:
- default:
- return NormalMove;
- }
+ case WhitePromotionChancellor:
+ return WhiteMarshall;
+ case BlackPromotionChancellor:
+ return BlackMarshall;
+ case WhitePromotionArchbishop:
+ return WhiteAngel;
+ case BlackPromotionArchbishop:
+ return BlackAngel;
+ case WhitePromotionCentaur:
+ return WhiteSilver;
+ case BlackPromotionCentaur:
+ return BlackSilver;
}
}
char pieceToChar[] = {
- 'P', 'N', 'B', 'R', 'Q', 'K',
- 'p', 'n', 'b', 'r', 'q', 'k', 'x'
- };
+ 'P', 'N', 'B', 'R', 'Q', 'F', 'E', 'A', 'C', 'W', 'M',
+ 'O', 'H', 'I', 'J', 'G', 'D', 'V', 'L', 'S', 'U', 'K',
+ 'p', 'n', 'b', 'r', 'q', 'f', 'e', 'a', 'c', 'w', 'm',
+ 'o', 'h', 'i', 'j', 'g', 'd', 'v', 'l', 's', 'u', 'k',
+ 'x' };
char PieceToChar(p)
ChessSquare p;
{
+ if((int)p < 0 || (int)p >= (int)EmptySquare) return('x'); /* [HGM] for safety */
return pieceToChar[(int) p];
}
+int PieceToNumber(p) /* [HGM] holdings: count piece type, ignoring non-participating piece types */
+ ChessSquare p;
+{
+ int i=0;
+ ChessSquare start = (int)p >= (int)BlackPawn ? BlackPawn : WhitePawn;
+
+ while(start++ != p) if(pieceToChar[(int)start-1] != '.') i++;
+ return i;
+}
+
ChessSquare CharToPiece(c)
int c;
{
- switch (c) {
- default:
- case 'x': return EmptySquare;
- case 'P': return WhitePawn;
- case 'R': return WhiteRook;
- case 'N': return WhiteKnight;
- case 'B': return WhiteBishop;
- case 'Q': return WhiteQueen;
- case 'K': return WhiteKing;
- case 'p': return BlackPawn;
- case 'r': return BlackRook;
- case 'n': return BlackKnight;
- case 'b': return BlackBishop;
- case 'q': return BlackQueen;
- case 'k': return BlackKing;
- }
+ int i;
+ for(i=0; i< (int) EmptySquare; i++)
+ if(pieceToChar[i] == c) return (ChessSquare) i;
+ return EmptySquare;
+}
+
+ChessMove PromoCharToMoveType(whiteOnMove, promoChar)
+ int whiteOnMove;
+ int promoChar;
+{ /* [HGM] made dependent on CharToPiece to alow alternate piece letters */
+ ChessSquare piece = CharToPiece(whiteOnMove ? ToUpper(promoChar) : ToLower(promoChar) );
+
+
+ if(promoChar == NULLCHAR) return NormalMove;
+
+ switch(piece) {
+ case WhiteQueen:
+ return WhitePromotionQueen;
+ case WhiteRook:
+ return WhitePromotionRook;
+ case WhiteBishop:
+ return WhitePromotionBishop;
+ case WhiteKnight:
+ return WhitePromotionKnight;
+ case WhiteKing:
+ return WhitePromotionKing;
+ case WhiteAngel:
+ return WhitePromotionArchbishop;
+ case WhiteMarshall:
+ return WhitePromotionChancellor;
+ case WhiteSilver:
+ return WhitePromotionCentaur;
+ case BlackQueen:
+ return BlackPromotionQueen;
+ case BlackRook:
+ return BlackPromotionRook;
+ case BlackBishop:
+ return BlackPromotionBishop;
+ case BlackKnight:
+ return BlackPromotionKnight;
+ case BlackKing:
+ return BlackPromotionKing;
+ case BlackAngel:
+ return BlackPromotionArchbishop;
+ case BlackMarshall:
+ return BlackPromotionChancellor;
+ case BlackSilver:
+ return BlackPromotionCentaur;
+ default:
+ // not all promotion implemented yet! Take Queen for those we don't know.
+ return (whiteOnMove ? WhitePromotionQueen : BlackPromotionQueen);
+ }
}
void CopyBoard(to, from)
{
int i, j;
- for (i = 0; i < BOARD_SIZE; i++)
- for (j = 0; j < BOARD_SIZE; j++)
+ for (i = 0; i < BOARD_HEIGHT; i++)
+ for (j = 0; j < BOARD_WIDTH; j++)
to[i][j] = from[i][j];
}
{
int i, j;
- for (i = 0; i < BOARD_SIZE; i++)
- for (j = 0; j < BOARD_SIZE; j++) {
+ for (i = 0; i < BOARD_HEIGHT; i++)
+ for (j = 0; j < BOARD_WIDTH; j++) {
if (board1[i][j] != board2[i][j])
return FALSE;
}
VOIDSTAR closure;
{
int rf, ff;
- int i, j, d, s, fs, rs, rt, ft;
+ int i, j, d, s, fs, rs, rt, ft, m;
+
+ for (rf = 0; rf < BOARD_HEIGHT; rf++)
+ for (ff = BOARD_LEFT; ff < BOARD_RGHT; ff++) {
+ ChessSquare piece;
- for (rf = 0; rf <= 7; rf++)
- for (ff = 0; ff <= 7; ff++) {
if (flags & F_WHITE_ON_MOVE) {
if (!WhitePiece(board[rf][ff])) continue;
} else {
if (!BlackPiece(board[rf][ff])) continue;
}
- switch (board[rf][ff]) {
- case EmptySquare:
+ m = 0; piece = board[rf][ff];
+ if(PieceToChar(piece) == '~')
+ piece = (ChessSquare) ( DEMOTED piece );
+ if(gameInfo.variant == VariantShogi)
+ piece = (ChessSquare) ( SHOGI piece );
+
+ switch (piece) {
+ /* case EmptySquare: [HGM] this is nonsense, and conflicts with Shogi cases */
default:
- /* can't happen */
+ /* can't happen ([HGM] except for faries...) */
break;
- case WhitePawn:
- if (rf < 7 && board[rf + 1][ff] == EmptySquare) {
+ case WhitePawn:
+ if(gameInfo.variant == VariantXiangqi) {
+ /* [HGM] capture and move straight ahead in Xiangqi */
+ if (rf < BOARD_HEIGHT-1 &&
+ !SameColor(board[rf][ff], board[rf + 1][ff]) ) {
+ callback(board, flags, NormalMove,
+ rf, ff, rf + 1, ff, closure);
+ }
+ /* and move sideways when across the river */
+ for (s = -1; s <= 1; s += 2) {
+ if (rf >= BOARD_HEIGHT>>1 &&
+ ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
+ !WhitePiece(board[rf][ff+s]) ) {
+ callback(board, flags, NormalMove,
+ rf, ff, rf, ff+s, closure);
+ }
+ }
+ break;
+ }
+ if (rf < BOARD_HEIGHT-1 && board[rf + 1][ff] == EmptySquare) {
callback(board, flags,
- rf == 6 ? WhitePromotionQueen : NormalMove,
+ rf == BOARD_HEIGHT-2 ? WhitePromotionQueen : NormalMove,
rf, ff, rf + 1, ff, closure);
}
if (rf == 1 && board[2][ff] == EmptySquare &&
- board[3][ff] == EmptySquare) {
- callback(board, flags, NormalMove,
- rf, ff, 3, ff, closure);
+ gameInfo.variant != VariantShatranj && /* [HGM] */
+ gameInfo.variant != VariantCourier && /* [HGM] */
+ board[3][ff] == EmptySquare ) {
+ callback(board, flags, NormalMove,
+ rf, ff, 3, ff, closure);
}
for (s = -1; s <= 1; s += 2) {
- if (rf < 7 && ff + s >= 0 && ff + s <= 7 &&
+ if (rf < BOARD_HEIGHT-1 && ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
((flags & F_KRIEGSPIEL_CAPTURE) ||
BlackPiece(board[rf + 1][ff + s]))) {
callback(board, flags,
- rf == 6 ? WhitePromotionQueen : NormalMove,
+ rf == BOARD_HEIGHT-2 ? WhitePromotionQueen : NormalMove,
rf, ff, rf + 1, ff + s, closure);
}
- if (rf == 4) {
- if (ff + s >= 0 && ff + s <= 7 &&
+ if (rf == BOARD_HEIGHT-4) {
+ if (ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
(epfile == ff + s || epfile == EP_UNKNOWN) &&
- board[4][ff + s] == BlackPawn &&
- board[5][ff + s] == EmptySquare) {
+ board[BOARD_HEIGHT-4][ff + s] == BlackPawn &&
+ board[BOARD_HEIGHT-3][ff + s] == EmptySquare) {
callback(board, flags, WhiteCapturesEnPassant,
rf, ff, 5, ff + s, closure);
}
break;
case BlackPawn:
+ if(gameInfo.variant == VariantXiangqi) {
+ /* [HGM] capture straight ahead in Xiangqi */
+ if (rf > 0 && !SameColor(board[rf][ff], board[rf - 1][ff]) ) {
+ callback(board, flags, NormalMove,
+ rf, ff, rf - 1, ff, closure);
+ }
+ /* and move sideways when across the river */
+ for (s = -1; s <= 1; s += 2) {
+ if (rf < BOARD_HEIGHT>>1 &&
+ ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
+ !BlackPiece(board[rf][ff+s]) ) {
+ callback(board, flags, NormalMove,
+ rf, ff, rf, ff+s, closure);
+ }
+ }
+ break;
+ }
if (rf > 0 && board[rf - 1][ff] == EmptySquare) {
callback(board, flags,
rf == 1 ? BlackPromotionQueen : NormalMove,
rf, ff, rf - 1, ff, closure);
}
- if (rf == 6 && board[5][ff] == EmptySquare &&
- board[4][ff] == EmptySquare) {
+ if (rf == BOARD_HEIGHT-2 && board[BOARD_HEIGHT-3][ff] == EmptySquare &&
+ gameInfo.variant != VariantShatranj && /* [HGM] */
+ gameInfo.variant != VariantCourier && /* [HGM] */
+ board[BOARD_HEIGHT-4][ff] == EmptySquare) {
callback(board, flags, NormalMove,
- rf, ff, 4, ff, closure);
+ rf, ff, BOARD_HEIGHT-4, ff, closure);
}
for (s = -1; s <= 1; s += 2) {
- if (rf > 0 && ff + s >= 0 && ff + s <= 7 &&
+ if (rf > 0 && ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
((flags & F_KRIEGSPIEL_CAPTURE) ||
WhitePiece(board[rf - 1][ff + s]))) {
callback(board, flags,
rf, ff, rf - 1, ff + s, closure);
}
if (rf == 3) {
- if (ff + s >= 0 && ff + s <= 7 &&
+ if (ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
(epfile == ff + s || epfile == EP_UNKNOWN) &&
board[3][ff + s] == WhitePawn &&
board[2][ff + s] == EmptySquare) {
}
break;
+ case WhiteUnicorn:
+ case BlackUnicorn:
case WhiteKnight:
case BlackKnight:
+ mounted:
for (i = -1; i <= 1; i += 2)
for (j = -1; j <= 1; j += 2)
for (s = 1; s <= 2; s++) {
rt = rf + i*s;
ft = ff + j*(3-s);
- if (rt < 0 || rt > 7 || ft < 0 || ft > 7) continue;
- if (SameColor(board[rf][ff], board[rt][ft])) continue;
+ if (!(rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT)
+ && ( gameInfo.variant != VariantXiangqi || board[rf+i*(s-1)][ff+j*(2-s)] == EmptySquare)
+ && !SameColor(board[rf][ff], board[rt][ft]))
callback(board, flags, NormalMove,
rf, ff, rt, ft, closure);
}
break;
+ case SHOGI WhiteKnight:
+ for (s = -1; s <= 1; s += 2) {
+ if (rf < BOARD_HEIGHT-2 && ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
+ !SameColor(board[rf][ff], board[rf + 2][ff + s])) {
+ callback(board, flags, NormalMove,
+ rf, ff, rf + 2, ff + s, closure);
+ }
+ }
+ break;
+
+ case SHOGI BlackKnight:
+ for (s = -1; s <= 1; s += 2) {
+ if (rf > 1 && ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
+ !SameColor(board[rf][ff], board[rf - 2][ff + s])) {
+ callback(board, flags, NormalMove,
+ rf, ff, rf - 2, ff + s, closure);
+ }
+ }
+ break;
+
+ case WhiteCannon:
+ case BlackCannon:
+ for (d = 0; d <= 1; d++)
+ for (s = -1; s <= 1; s += 2) {
+ m = 0;
+ for (i = 1;; i++) {
+ rt = rf + (i * s) * d;
+ ft = ff + (i * s) * (1 - d);
+ if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) break;
+ if (m == 0 && board[rt][ft] == EmptySquare)
+ callback(board, flags, NormalMove,
+ rf, ff, rt, ft, closure);
+ if (m == 1 && board[rt][ft] != EmptySquare &&
+ !SameColor(board[rf][ff], board[rt][ft]) )
+ callback(board, flags, NormalMove,
+ rf, ff, rt, ft, closure);
+ if (board[rt][ft] != EmptySquare && m++) break;
+ }
+ }
+ break;
+
+ /* Gold General (and all its promoted versions) . First do the */
+ /* diagonal forward steps, then proceed as normal Wazir */
+ case SHOGI WhiteWazir:
+ case SHOGI (PROMOTED WhitePawn):
+ case SHOGI (PROMOTED WhiteKnight):
+ case SHOGI (PROMOTED WhiteQueen):
+ case SHOGI (PROMOTED WhiteFerz):
+ for (s = -1; s <= 1; s += 2) {
+ if (rf < BOARD_HEIGHT-1 && ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
+ !SameColor(board[rf][ff], board[rf + 1][ff + s])) {
+ callback(board, flags, NormalMove,
+ rf, ff, rf + 1, ff + s, closure);
+ }
+ }
+ goto finishGold;
+
+ case SHOGI BlackWazir:
+ case SHOGI (PROMOTED BlackPawn):
+ case SHOGI (PROMOTED BlackKnight):
+ case SHOGI (PROMOTED BlackQueen):
+ case SHOGI (PROMOTED BlackFerz):
+ for (s = -1; s <= 1; s += 2) {
+ if (rf > 0 && ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
+ !SameColor(board[rf][ff], board[rf - 1][ff + s])) {
+ callback(board, flags, NormalMove,
+ rf, ff, rf - 1, ff + s, closure);
+ }
+ }
+
+ case WhiteWazir:
+ case BlackWazir:
+ finishGold:
+ for (d = 0; d <= 1; d++)
+ for (s = -1; s <= 1; s += 2) {
+ rt = rf + s * d;
+ ft = ff + s * (1 - d);
+ if (!(rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT)
+ && !SameColor(board[rf][ff], board[rt][ft]) &&
+ (gameInfo.variant != VariantXiangqi || InPalace(rt, ft) ) )
+ callback(board, flags, NormalMove,
+ rf, ff, rt, ft, closure);
+ }
+ break;
+
+ case WhiteAlfil:
+ case BlackAlfil:
+ /* [HGM] support Shatranj pieces */
+ for (rs = -1; rs <= 1; rs += 2)
+ for (fs = -1; fs <= 1; fs += 2) {
+ rt = rf + 2 * rs;
+ ft = ff + 2 * fs;
+ if (!(rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT)
+ && ( gameInfo.variant != VariantXiangqi ||
+ board[rf+rs][ff+fs] == EmptySquare && (2*rf < BOARD_HEIGHT) == (2*rt < BOARD_HEIGHT) )
+
+ && !SameColor(board[rf][ff], board[rt][ft]))
+ callback(board, flags, NormalMove,
+ rf, ff, rt, ft, closure);
+ }
+ break;
+
+ /* Shogi Dragon Horse has to continue with Wazir after Bishop */
+ case SHOGI WhiteCardinal:
+ case SHOGI BlackCardinal:
+ m++;
+
+ /* Capablanca Archbishop continues as Knight */
+ case WhiteAngel:
+ case BlackAngel:
+ m++;
+
+ /* Shogi Bishops are ordinary Bishops */
+ case SHOGI WhiteBishop:
+ case SHOGI BlackBishop:
case WhiteBishop:
case BlackBishop:
for (rs = -1; rs <= 1; rs += 2)
- for (fs = -1; fs <= 1; fs += 2)
+ for (fs = -1; fs <= 1; fs += 2)
for (i = 1;; i++) {
rt = rf + (i * rs);
ft = ff + (i * fs);
- if (rt < 0 || rt > 7 || ft < 0 || ft > 7) break;
+ if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) break;
if (SameColor(board[rf][ff], board[rt][ft])) break;
callback(board, flags, NormalMove,
rf, ff, rt, ft, closure);
if (board[rt][ft] != EmptySquare) break;
}
+ if(m==1) goto mounted;
+ if(m==2) goto finishGold;
+ /* Bishop falls through */
break;
+ /* Shogi Lance is unlike anything, and asymmetric at that */
+ case SHOGI WhiteQueen:
+ for(i = 1;; i++) {
+ rt = rf + i;
+ ft = ff;
+ if (rt >= BOARD_HEIGHT) break;
+ if (SameColor(board[rf][ff], board[rt][ft])) break;
+ callback(board, flags, NormalMove,
+ rf, ff, rt, ft, closure);
+ if (board[rt][ft] != EmptySquare) break;
+ }
+ break;
+
+ case SHOGI BlackQueen:
+ for(i = 1;; i++) {
+ rt = rf - i;
+ ft = ff;
+ if (rt < 0) break;
+ if (SameColor(board[rf][ff], board[rt][ft])) break;
+ callback(board, flags, NormalMove,
+ rf, ff, rt, ft, closure);
+ if (board[rt][ft] != EmptySquare) break;
+ }
+ break;
+
+ /* Shogi Dragon King has to continue as Ferz after Rook moves */
+ case SHOGI WhiteDragon:
+ case SHOGI BlackDragon:
+ m++;
+
+ /* Capablanca Chancellor sets flag to continue as Knight */
+ case WhiteMarshall:
+ case BlackMarshall:
+ m++;
+
+ /* Shogi Rooks are ordinary Rooks */
+ case SHOGI WhiteRook:
+ case SHOGI BlackRook:
case WhiteRook:
case BlackRook:
- for (d = 0; d <= 1; d++)
- for (s = -1; s <= 1; s += 2)
+ for (d = 0; d <= 1; d++)
+ for (s = -1; s <= 1; s += 2)
for (i = 1;; i++) {
rt = rf + (i * s) * d;
ft = ff + (i * s) * (1 - d);
- if (rt < 0 || rt > 7 || ft < 0 || ft > 7) break;
+ if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) break;
if (SameColor(board[rf][ff], board[rt][ft])) break;
callback(board, flags, NormalMove,
rf, ff, rt, ft, closure);
if (board[rt][ft] != EmptySquare) break;
}
+ if(m==1) goto mounted;
+ if(m==2) goto finishSilver;
break;
case WhiteQueen:
for (i = 1;; i++) {
rt = rf + (i * rs);
ft = ff + (i * fs);
- if (rt < 0 || rt > 7 || ft < 0 || ft > 7) break;
+ if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) break;
if (SameColor(board[rf][ff], board[rt][ft])) break;
callback(board, flags, NormalMove,
rf, ff, rt, ft, closure);
}
break;
+ /* Shogi Pawn and Silver General: first the Pawn move, */
+ /* then the General continues like a Ferz */
+ case SHOGI WhitePawn:
+ case SHOGI WhiteFerz:
+ if (rf < BOARD_HEIGHT-1 &&
+ !SameColor(board[rf][ff], board[rf + 1][ff]) )
+ callback(board, flags, NormalMove,
+ rf, ff, rf + 1, ff, closure);
+ if(piece != SHOGI WhitePawn) goto finishSilver;
+ break;
+
+ case SHOGI BlackPawn:
+ case SHOGI BlackFerz:
+ if (rf > 0 &&
+ !SameColor(board[rf][ff], board[rf - 1][ff]) )
+ callback(board, flags, NormalMove,
+ rf, ff, rf - 1, ff, closure);
+ if(piece == SHOGI BlackPawn) break;
+
+ case WhiteFerz:
+ case BlackFerz:
+ finishSilver:
+ /* [HGM] support Shatranj pieces */
+ for (rs = -1; rs <= 1; rs += 2)
+ for (fs = -1; fs <= 1; fs += 2) {
+ rt = rf + rs;
+ ft = ff + fs;
+ if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) continue;
+ if (!SameColor(board[rf][ff], board[rt][ft]) &&
+ (gameInfo.variant != VariantXiangqi || InPalace(rt, ft) ) )
+ callback(board, flags, NormalMove,
+ rf, ff, rt, ft, closure);
+ }
+ break;
+
+ case WhiteSilver:
+ case BlackSilver:
+ m++; // [HGM] superchess: use for Centaur
+ case WhiteMan:
+ case BlackMan:
+ case SHOGI WhiteKing:
+ case SHOGI BlackKing:
case WhiteKing:
case BlackKing:
+// walking:
for (i = -1; i <= 1; i++)
for (j = -1; j <= 1; j++) {
if (i == 0 && j == 0) continue;
rt = rf + i;
ft = ff + j;
- if (rt < 0 || rt > 7 || ft < 0 || ft > 7) continue;
+ if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) continue;
if (SameColor(board[rf][ff], board[rt][ft])) continue;
callback(board, flags, NormalMove,
rf, ff, rt, ft, closure);
}
+ if(m==1) goto mounted;
+ break;
+
+ case WhiteNightrider:
+ case BlackNightrider:
+ for (i = -1; i <= 1; i += 2)
+ for (j = -1; j <= 1; j += 2)
+ for (s = 1; s <= 2; s++) { int k;
+ for(k=1;; k++) {
+ rt = rf + k*i*s;
+ ft = ff + k*j*(3-s);
+ if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) break;
+ if (SameColor(board[rf][ff], board[rt][ft])) break;
+ callback(board, flags, NormalMove,
+ rf, ff, rt, ft, closure);
+ if (board[rt][ft] != EmptySquare) break;
+ }
+ }
break;
+ case WhiteFalcon: // [HGM] wild: for wildcards, self-capture symbolizes move to anywhere
+ case BlackFalcon:
+ case WhiteCobra:
+ case BlackCobra:
+ case WhiteLance:
+ case BlackLance:
+ callback(board, flags, NormalMove, rf, ff, rf, ff, closure);
+ break;
+
}
}
}
if (board[rf][ff] == king) return;
for (r = rt-1; r <= rt+1; r++) {
for (f = ft-1; f <= ft+1; f++) {
- if (r >= 0 && r <= 7 && f >= 0 && f <= 7 &&
+ if (r >= 0 && r < BOARD_HEIGHT && f >= BOARD_LEFT && f < BOARD_RGHT &&
board[r][f] == king) return;
}
}
}
+typedef struct {
+ int rf, ff, rt, ft;
+ ChessMove kind;
+ int captures; // [HGM] losers
+} LegalityTestClosure;
+
+
/* Like GenPseudoLegal, but (1) include castling moves, (2) unless
F_IGNORE_CHECK is set in the flags, omit moves that would leave the
king in check, and (3) if F_ATOMIC_CAPTURE is set in the flags, omit
moves that would destroy your own king. The CASTLE_OK flags are
true if castling is not yet ruled out by a move of the king or
rook. Return TRUE if the player on move is currently in check and
- F_IGNORE_CHECK is not set. */
-int GenLegal(board, flags, epfile, callback, closure)
+ F_IGNORE_CHECK is not set. [HGM] add castlingRights parameter */
+int GenLegal(board, flags, epfile, castlingRights, callback, closure)
Board board;
int flags;
int epfile;
+ char castlingRights[];
MoveCallback callback;
VOIDSTAR closure;
{
GenLegalClosure cl;
- int ff;
+ int ff, ft, k, left, right;
int ignoreCheck = (flags & F_IGNORE_CHECK) != 0;
+ ChessSquare wKing = WhiteKing, bKing = BlackKing;
cl.cb = callback;
cl.cl = closure;
CheckTest(board, flags, -1, -1, -1, -1, FALSE)) return TRUE;
/* Generate castling moves */
- for (ff = 4; ff >= 3; ff-- /*ics wild 1*/) {
+ if(gameInfo.variant == VariantKnightmate) { /* [HGM] Knightmate */
+ wKing = WhiteUnicorn; bKing = BlackUnicorn;
+ }
+
+ for (ff = BOARD_WIDTH>>1; ff >= (BOARD_WIDTH-1)>>1; ff-- /*ics wild 1*/) {
if ((flags & F_WHITE_ON_MOVE) &&
(flags & F_WHITE_KCASTLE_OK) &&
- board[0][ff] == WhiteKing &&
- board[0][ff + 1] == EmptySquare &&
- board[0][ff + 2] == EmptySquare &&
- board[0][6] == EmptySquare &&
- board[0][7] == WhiteRook &&
- (ignoreCheck ||
+ board[0][ff] == wKing &&
+ board[0][ff + 1] == EmptySquare &&
+ board[0][ff + 2] == EmptySquare &&
+ board[0][BOARD_RGHT-3] == EmptySquare &&
+ board[0][BOARD_RGHT-2] == EmptySquare &&
+ board[0][BOARD_RGHT-1] == WhiteRook &&
+ castlingRights[0] >= 0 && /* [HGM] check rights */
+ ( castlingRights[2] == ff || castlingRights[6] == ff ) &&
+ (ignoreCheck ||
(!CheckTest(board, flags, 0, ff, 0, ff + 1, FALSE) &&
+ !CheckTest(board, flags, 0, ff, 0, BOARD_RGHT-3, FALSE) &&
+ (gameInfo.variant != VariantJanus || !CheckTest(board, flags, 0, ff, 0, BOARD_RGHT-2, FALSE)) &&
!CheckTest(board, flags, 0, ff, 0, ff + 2, FALSE)))) {
callback(board, flags,
- ff==4 ? WhiteKingSideCastle : WhiteKingSideCastleWild,
- 0, ff, 0, ff + 2, closure);
+ ff==BOARD_WIDTH>>1 ? WhiteKingSideCastle : WhiteKingSideCastleWild,
+ 0, ff, 0, ff + ((gameInfo.boardWidth+2)>>2) + (gameInfo.variant == VariantJanus), closure);
}
if ((flags & F_WHITE_ON_MOVE) &&
(flags & F_WHITE_QCASTLE_OK) &&
- board[0][ff] == WhiteKing &&
+ board[0][ff] == wKing &&
board[0][ff - 1] == EmptySquare &&
board[0][ff - 2] == EmptySquare &&
- board[0][1] == EmptySquare &&
- board[0][0] == WhiteRook &&
+ board[0][BOARD_LEFT+2] == EmptySquare &&
+ board[0][BOARD_LEFT+1] == EmptySquare &&
+ board[0][BOARD_LEFT+0] == WhiteRook &&
+ castlingRights[1] >= 0 && /* [HGM] check rights */
+ ( castlingRights[2] == ff || castlingRights[6] == ff ) &&
(ignoreCheck ||
(!CheckTest(board, flags, 0, ff, 0, ff - 1, FALSE) &&
+ !CheckTest(board, flags, 0, ff, 0, BOARD_LEFT+3, FALSE) &&
!CheckTest(board, flags, 0, ff, 0, ff - 2, FALSE)))) {
callback(board, flags,
- ff==4 ? WhiteQueenSideCastle : WhiteQueenSideCastleWild,
- 0, ff, 0, ff - 2, closure);
+ ff==BOARD_WIDTH>>1 ? WhiteQueenSideCastle : WhiteQueenSideCastleWild,
+ 0, ff, 0, ff - ((gameInfo.boardWidth+2)>>2), closure);
}
if (!(flags & F_WHITE_ON_MOVE) &&
(flags & F_BLACK_KCASTLE_OK) &&
- board[7][ff] == BlackKing &&
- board[7][ff + 1] == EmptySquare &&
- board[7][ff + 2] == EmptySquare &&
- board[7][6] == EmptySquare &&
- board[7][7] == BlackRook &&
+ board[BOARD_HEIGHT-1][ff] == bKing &&
+ board[BOARD_HEIGHT-1][ff + 1] == EmptySquare &&
+ board[BOARD_HEIGHT-1][ff + 2] == EmptySquare &&
+ board[BOARD_HEIGHT-1][BOARD_RGHT-3] == EmptySquare &&
+ board[BOARD_HEIGHT-1][BOARD_RGHT-2] == EmptySquare &&
+ board[BOARD_HEIGHT-1][BOARD_RGHT-1] == BlackRook &&
+ castlingRights[3] >= 0 && /* [HGM] check rights */
+ ( castlingRights[5] == ff || castlingRights[7] == ff ) &&
(ignoreCheck ||
- (!CheckTest(board, flags, 7, ff, 7, ff + 1, FALSE) &&
- !CheckTest(board, flags, 7, ff, 7, ff + 2, FALSE)))) {
+ (!CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ff + 1, FALSE) &&
+ !CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, BOARD_RGHT-3, FALSE) &&
+ (gameInfo.variant != VariantJanus || !CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, BOARD_RGHT-2, FALSE)) &&
+ !CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ff + 2, FALSE)))) {
callback(board, flags,
- ff==4 ? BlackKingSideCastle : BlackKingSideCastleWild,
- 7, ff, 7, ff + 2, closure);
+ ff==BOARD_WIDTH>>1 ? BlackKingSideCastle : BlackKingSideCastleWild,
+ BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ff + ((gameInfo.boardWidth+2)>>2) + (gameInfo.variant == VariantJanus), closure);
}
if (!(flags & F_WHITE_ON_MOVE) &&
(flags & F_BLACK_QCASTLE_OK) &&
- board[7][ff] == BlackKing &&
- board[7][ff - 1] == EmptySquare &&
- board[7][ff - 2] == EmptySquare &&
- board[7][1] == EmptySquare &&
- board[7][0] == BlackRook &&
+ board[BOARD_HEIGHT-1][ff] == bKing &&
+ board[BOARD_HEIGHT-1][ff - 1] == EmptySquare &&
+ board[BOARD_HEIGHT-1][ff - 2] == EmptySquare &&
+ board[BOARD_HEIGHT-1][BOARD_LEFT+2] == EmptySquare &&
+ board[BOARD_HEIGHT-1][BOARD_LEFT+1] == EmptySquare &&
+ board[BOARD_HEIGHT-1][BOARD_LEFT+0] == BlackRook &&
+ castlingRights[4] >= 0 && /* [HGM] check rights */
+ ( castlingRights[5] == ff || castlingRights[7] == ff ) &&
(ignoreCheck ||
- (!CheckTest(board, flags, 7, ff, 7, ff - 1, FALSE) &&
- !CheckTest(board, flags, 7, ff, 7, ff - 1, FALSE)))) {
+ (!CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ff - 1, FALSE) &&
+ !CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, BOARD_LEFT+3, FALSE) &&
+ !CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ff - 2, FALSE)))) {
callback(board, flags,
- ff==4 ? BlackQueenSideCastle : BlackQueenSideCastleWild,
- 7, ff, 7, ff - 2, closure);
+ ff==BOARD_WIDTH>>1 ? BlackQueenSideCastle : BlackQueenSideCastleWild,
+ BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ff - ((gameInfo.boardWidth+2)>>2), closure);
}
}
+ if(gameInfo.variant == VariantFischeRandom) {
+
+ /* generate all potential FRC castling moves (KxR), ignoring flags */
+ /* [HGM] test if the Rooks we find have castling rights */
+
+
+ if ((flags & F_WHITE_ON_MOVE) != 0) {
+ ff = castlingRights[2]; /* King file if we have any rights */
+ if(ff > 0 && board[0][ff] == WhiteKing) {
+ if (appData.debugMode) {
+ fprintf(debugFP, "FRC castling, %d %d %d %d %d %d\n",
+ castlingRights[0],castlingRights[1],ff,castlingRights[3],castlingRights[4],castlingRights[5]);
+ }
+ ft = castlingRights[0]; /* Rook file if we have H-side rights */
+ left = ff+1;
+ right = BOARD_RGHT-2;
+ if(ff == BOARD_RGHT-2) left = right = ff-1; /* special case */
+ for(k=left; k<=right && ft >= 0; k++) /* first test if blocked */
+ if(k != ft && board[0][k] != EmptySquare) ft = -1;
+ for(k=left; k<right && ft >= 0; k++) /* then if not checked */
+ if(!ignoreCheck && CheckTest(board, flags, 0, ff, 0, k, FALSE)) ft = -1;
+ if(ft >= 0 && board[0][ft] == WhiteRook)
+ callback(board, flags, WhiteHSideCastleFR, 0, ff, 0, ft, closure);
+
+ ft = castlingRights[1]; /* Rook file if we have A-side rights */
+ left = BOARD_LEFT+2;
+ right = ff-1;
+ if(ff <= BOARD_LEFT+2) { left = ff+1; right = BOARD_LEFT+3; }
+ for(k=left; k<=right && ft >= 0; k++) /* first test if blocked */
+ if(k != ft && board[0][k] != EmptySquare) ft = -1;
+ if(ff > BOARD_LEFT+2)
+ for(k=left+1; k<=right && ft >= 0; k++) /* then if not checked */
+ if(!ignoreCheck && CheckTest(board, flags, 0, ff, 0, k, FALSE)) ft = -1;
+ if(ft >= 0 && board[0][ft] == WhiteRook)
+ callback(board, flags, WhiteASideCastleFR, 0, ff, 0, ft, closure);
+ }
+ } else {
+ ff = castlingRights[5]; /* King file if we have any rights */
+ if(ff > 0 && board[BOARD_HEIGHT-1][ff] == BlackKing) {
+ ft = castlingRights[3]; /* Rook file if we have H-side rights */
+ left = ff+1;
+ right = BOARD_RGHT-2;
+ if(ff == BOARD_RGHT-2) left = right = ff-1; /* special case */
+ for(k=left; k<=right && ft >= 0; k++) /* first test if blocked */
+ if(k != ft && board[BOARD_HEIGHT-1][k] != EmptySquare) ft = -1;
+ for(k=left; k<right && ft >= 0; k++) /* then if not checked */
+ if(!ignoreCheck && CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, k, FALSE)) ft = -1;
+ if(ft >= 0 && board[BOARD_HEIGHT-1][ft] == BlackRook)
+ callback(board, flags, BlackHSideCastleFR, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ft, closure);
+
+ ft = castlingRights[4]; /* Rook file if we have A-side rights */
+ left = BOARD_LEFT+2;
+ right = ff-1;
+ if(ff <= BOARD_LEFT+2) { left = ff+1; right = BOARD_LEFT+3; }
+ for(k=left; k<=right && ft >= 0; k++) /* first test if blocked */
+ if(k != ft && board[BOARD_HEIGHT-1][k] != EmptySquare) ft = -1;
+ if(ff > BOARD_LEFT+2)
+ for(k=left+1; k<=right && ft >= 0; k++) /* then if not checked */
+ if(!ignoreCheck && CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, k, FALSE)) ft = -1;
+ if(ft >= 0 && board[BOARD_HEIGHT-1][ft] == BlackRook)
+ callback(board, flags, BlackASideCastleFR, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ft, closure);
+ }
+ }
+
+ }
+
return FALSE;
}
ChessSquare captured = EmptySquare;
/* Suppress warnings on uninitialized variables */
+ if(gameInfo.variant == VariantXiangqi)
+ king = flags & F_WHITE_ON_MOVE ? WhiteWazir : BlackWazir;
+ if(gameInfo.variant == VariantKnightmate)
+ king = flags & F_WHITE_ON_MOVE ? WhiteUnicorn : BlackUnicorn;
+
if (rf >= 0) {
if (enPassant) {
captured = board[rf][ft];
order a1, a2, a3, ... b1, b2, ..., h8 to find the first king,
and we test only whether that one is in check. */
cl.check = 0;
- for (cl.fking = 0; cl.fking <= 7; cl.fking++)
- for (cl.rking = 0; cl.rking <= 7; cl.rking++) {
- if (board[cl.rking][cl.fking] == king) {
+ for (cl.fking = BOARD_LEFT+0; cl.fking < BOARD_RGHT; cl.fking++)
+ for (cl.rking = 0; cl.rking < BOARD_HEIGHT; cl.rking++) {
+ if (board[cl.rking][cl.fking] == king) {
+ if(gameInfo.variant == VariantXiangqi) {
+ /* [HGM] In Xiangqi opposing Kings means check as well */
+ int i, dir;
+ dir = (king >= BlackPawn) ? -1 : 1;
+ for( i=cl.rking+dir; i>=0 && i<BOARD_HEIGHT &&
+ board[i][cl.fking] == EmptySquare; i+=dir );
+ if(i>=0 && i<BOARD_HEIGHT &&
+ board[i][cl.fking] == (dir>0 ? BlackWazir : WhiteWazir) )
+ cl.check++;
+ }
+
GenPseudoLegal(board, flags ^ F_WHITE_ON_MOVE, -1,
CheckTestCallback, (VOIDSTAR) &cl);
goto undo_move; /* 2-level break */
}
}
- return cl.check;
+ return cl.fking < BOARD_RGHT ? cl.check : 1000; // [HGM] atomic: return 1000 if we have no king
}
-typedef struct {
- int rf, ff, rt, ft;
- ChessMove kind;
-} LegalityTestClosure;
-
extern void LegalityTestCallback P((Board board, int flags, ChessMove kind,
int rf, int ff, int rt, int ft,
VOIDSTAR closure));
{
register LegalityTestClosure *cl = (LegalityTestClosure *) closure;
+// if (appData.debugMode) {
+// fprintf(debugFP, "Legality test: %c%c%c%c\n", ff+AAA, rf+ONE, ft+AAA, rt+ONE);
+// }
+ if(board[rt][ft] != EmptySquare || kind==WhiteCapturesEnPassant || kind==BlackCapturesEnPassant)
+ cl->captures++; // [HGM] losers: count legal captures
if (rf == cl->rf && ff == cl->ff && rt == cl->rt && ft == cl->ft)
cl->kind = kind;
}
-ChessMove LegalityTest(board, flags, epfile, rf, ff, rt, ft, promoChar)
+ChessMove LegalityTest(board, flags, epfile, castlingRights, rf, ff, rt, ft, promoChar)
Board board;
int flags, epfile;
int rf, ff, rt, ft, promoChar;
+ char castlingRights[];
{
- LegalityTestClosure cl;
+ LegalityTestClosure cl; ChessSquare piece = board[rf][ff];
+ if (appData.debugMode) {
+ int i;
+ for(i=0; i<6; i++) fprintf(debugFP, "%d ", castlingRights[i]);
+ fprintf(debugFP, "Legality test? %c%c%c%c\n", ff+AAA, rf+ONE, ft+AAA, rt+ONE);
+ }
+ /* [HGM] Lance, Cobra and Falcon are wildcard pieces; consider all their moves legal */
+ /* (perhaps we should disallow moves that obviously leave us in check?) */
+ if(piece == WhiteFalcon || piece == BlackFalcon ||
+ piece == WhiteCobra || piece == BlackCobra ||
+ piece == WhiteLance || piece == BlackLance)
+ return CheckTest(board, flags, rf, ff, rt, ft, FALSE) ? IllegalMove : NormalMove;
+
cl.rf = rf;
cl.ff = ff;
cl.rt = rt;
cl.ft = ft;
cl.kind = IllegalMove;
- GenLegal(board, flags, epfile, LegalityTestCallback, (VOIDSTAR) &cl);
+ cl.captures = 0; // [HGM] losers: prepare to count legal captures.
+ GenLegal(board, flags, epfile, castlingRights, LegalityTestCallback, (VOIDSTAR) &cl);
+ if((flags & F_MANDATORY_CAPTURE) && cl.captures && board[rt][ft] == EmptySquare
+ && cl.kind != WhiteCapturesEnPassant && cl.kind != BlackCapturesEnPassant)
+ return(IllegalMove); // [HGM] losers: if there are legal captures, non-capts are illegal
+
+ if(gameInfo.variant == VariantShogi) {
+ /* [HGM] Shogi promotions. '=' means defer */
+ if(rf != DROP_RANK && cl.kind == NormalMove) {
+ ChessSquare piece = board[rf][ff];
+
+ if(promoChar == PieceToChar(BlackQueen)) promoChar = NULLCHAR; /* [HGM] Kludge */
+ if(promoChar != NULLCHAR && promoChar != 'x' &&
+ promoChar != '+' && promoChar != '=' &&
+ ToUpper(PieceToChar(PROMOTED piece)) != ToUpper(promoChar) )
+ cl.kind = IllegalMove;
+ else if(flags & F_WHITE_ON_MOVE) {
+ if( (int) piece < (int) WhiteWazir &&
+ (rf > BOARD_HEIGHT-4 || rt > BOARD_HEIGHT-4) ) {
+ if( (piece == WhitePawn || piece == WhiteQueen) && rt > BOARD_HEIGHT-2 ||
+ piece == WhiteKnight && rt > BOARD_HEIGHT-3) /* promotion mandatory */
+ cl.kind = promoChar == '=' ? IllegalMove : WhitePromotionKnight;
+ else /* promotion optional, default is promote */
+ cl.kind = promoChar == '=' ? NormalMove : WhitePromotionQueen;
+
+ } else cl.kind = (promoChar == NULLCHAR || promoChar == 'x' || promoChar == '=') ?
+ NormalMove : IllegalMove;
+ } else {
+ if( (int) piece < (int) BlackWazir && (rf < 3 || rt < 3) ) {
+ if( (piece == BlackPawn || piece == BlackQueen) && rt < 1 ||
+ piece == BlackKnight && rt < 2 ) /* promotion obligatory */
+ cl.kind = promoChar == '=' ? IllegalMove : BlackPromotionKnight;
+ else /* promotion optional, default is promote */
+ cl.kind = promoChar == '=' ? NormalMove : BlackPromotionQueen;
+
+ } else cl.kind = (promoChar == NULLCHAR || promoChar == 'x' || promoChar == '=') ?
+ NormalMove : IllegalMove;
+ }
+ }
+ } else
if (promoChar != NULLCHAR && promoChar != 'x') {
+ if(promoChar == '=') cl.kind = IllegalMove; else // [HGM] shogi: no deferred promotion outside Shogi
if (cl.kind == WhitePromotionQueen || cl.kind == BlackPromotionQueen) {
cl.kind =
PromoCharToMoveType((flags & F_WHITE_ON_MOVE) != 0, promoChar);
cl.kind = IllegalMove;
}
}
+ /* [HGM] For promotions, 'ToQueen' = optional, 'ToKnight' = mandatory */
return cl.kind;
}
}
/* Return MT_NONE, MT_CHECK, MT_CHECKMATE, or MT_STALEMATE */
-int MateTest(board, flags, epfile)
+int MateTest(board, flags, epfile, castlingRights)
Board board;
int flags, epfile;
+ char castlingRights[];
{
MateTestClosure cl;
- int inCheck;
+ int inCheck, r, f, myPieces=0, hisPieces=0, nrKing=0;
+ ChessSquare king = flags & F_WHITE_ON_MOVE ? WhiteKing : BlackKing;
+ for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) {
+ // [HGM] losers: Count pieces and kings, to detect other unorthodox winning conditions
+ nrKing += (board[r][f] == king); // stm has king
+ if( board[r][f] != EmptySquare ) {
+ if((int)board[r][f] <= (int)king && (int)board[r][f] >= (int)king - (int)WhiteKing + (int)WhitePawn)
+ myPieces++;
+ else hisPieces++;
+ }
+ }
+ if(appData.debugMode) fprintf(debugFP, "MateTest: K=%d, my=%d, his=%d\n", nrKing, myPieces, hisPieces);
+ switch(gameInfo.variant) { // [HGM] losers: extinction wins
+ case VariantShatranj:
+ if(hisPieces == 1) return myPieces > 1 ? MT_BARE : MT_DRAW;
+ default:
+ break;
+ case VariantAtomic:
+ if(nrKing == 0) return MT_NOKING;
+ break;
+ case VariantLosers:
+ if(myPieces == 1) return MT_BARE;
+ }
cl.count = 0;
- inCheck = GenLegal(board, flags, epfile, MateTestCallback, (VOIDSTAR) &cl);
+ inCheck = GenLegal(board, flags, epfile, castlingRights, MateTestCallback, (VOIDSTAR) &cl);
+ // [HGM] 3check: yet to do!
if (cl.count > 0) {
return inCheck ? MT_CHECK : MT_NONE;
} else {
- return inCheck ? MT_CHECKMATE : MT_STALEMATE;
+ if(gameInfo.variant == VariantSuicide) // [HGM] losers: always stalemate, since no check, but result varies
+ return myPieces == hisPieces ? MT_STALEMATE :
+ myPieces > hisPieces ? MT_STAINMATE : MT_STEALMATE;
+ else if(gameInfo.variant == VariantLosers) return inCheck ? MT_TRICKMATE : MT_STEALMATE;
+ else if(gameInfo.variant == VariantGiveaway) return MT_STEALMATE; // no check exists, stalemated = win
+
+ return inCheck ? MT_CHECKMATE
+ : (gameInfo.variant == VariantXiangqi || gameInfo.variant == VariantShatranj) ?
+ MT_STAINMATE : MT_STALEMATE;
}
}
VOIDSTAR closure;
{
register DisambiguateClosure *cl = (DisambiguateClosure *) closure;
-
- if ((cl->pieceIn == EmptySquare || cl->pieceIn == board[rf][ff]) &&
+ int wildCard = FALSE; ChessSquare piece = board[rf][ff];
+
+ // [HGM] wild: for wild-card pieces rt and rf are dummies
+ if(piece == WhiteFalcon || piece == BlackFalcon ||
+ piece == WhiteCobra || piece == BlackCobra ||
+ piece == WhiteLance || piece == BlackLance)
+ wildCard = TRUE;
+
+ if ((cl->pieceIn == EmptySquare || cl->pieceIn == board[rf][ff]
+ || PieceToChar(board[rf][ff]) == '~'
+ && cl->pieceIn == (ChessSquare)(DEMOTED board[rf][ff])
+ ) &&
(cl->rfIn == -1 || cl->rfIn == rf) &&
(cl->ffIn == -1 || cl->ffIn == ff) &&
- (cl->rtIn == -1 || cl->rtIn == rt) &&
- (cl->ftIn == -1 || cl->ftIn == ft)) {
+ (cl->rtIn == -1 || cl->rtIn == rt || wildCard) &&
+ (cl->ftIn == -1 || cl->ftIn == ft || wildCard)) {
cl->count++;
- cl->piece = board[rf][ff];
+ cl->piece = board[rf][ff];
cl->rf = rf;
cl->ff = ff;
- cl->rt = rt;
- cl->ft = ft;
+ cl->rt = wildCard ? cl->rtIn : rt;
+ cl->ft = wildCard ? cl->ftIn : ft;
cl->kind = kind;
}
}
int flags, epfile;
DisambiguateClosure *closure;
{
- int illegal = 0;
+ int illegal = 0; char c = closure->promoCharIn;
+
closure->count = 0;
closure->rf = closure->ff = closure->rt = closure->ft = 0;
closure->kind = ImpossibleMove;
- GenLegal(board, flags, epfile, DisambiguateCallback, (VOIDSTAR) closure);
+ if (appData.debugMode) {
+ fprintf(debugFP, "Disambiguate in: %d(%d,%d)-(%d,%d) = %d (%c)\n",
+ closure->pieceIn,closure->ffIn,closure->rfIn,closure->ftIn,closure->rtIn,
+ closure->promoCharIn, closure->promoCharIn >= ' ' ? closure->promoCharIn : '-');
+ }
+ GenLegal(board, flags, epfile, initialRights, DisambiguateCallback, (VOIDSTAR) closure);
if (closure->count == 0) {
/* See if it's an illegal move due to check */
illegal = 1;
- GenLegal(board, flags|F_IGNORE_CHECK, epfile, DisambiguateCallback,
+ GenLegal(board, flags|F_IGNORE_CHECK, epfile, initialRights, DisambiguateCallback,
(VOIDSTAR) closure);
if (closure->count == 0) {
/* No, it's not even that */
+ if (appData.debugMode) { int i, j;
+ for(i=BOARD_HEIGHT-1; i>=0; i--) {
+ for(j=0; j<BOARD_WIDTH; j++)
+ fprintf(debugFP, "%3d", (int) board[i][j]);
+ fprintf(debugFP, "\n");
+ }
+ }
return;
}
}
+
+ if(gameInfo.variant == VariantShogi) {
+ /* [HGM] Shogi promotions. '=' means defer */
+ if(closure->rfIn != DROP_RANK && closure->kind == NormalMove) {
+ ChessSquare piece = closure->piece;
+ if(c != NULLCHAR && c != 'x' && c != '+' && c != '=' &&
+ ToUpper(PieceToChar(PROMOTED piece)) != ToUpper(c) )
+ closure->kind = IllegalMove;
+ else if(flags & F_WHITE_ON_MOVE) {
+ if( (int) piece < (int) WhiteWazir &&
+ (closure->rf > BOARD_HEIGHT-4 || closure->rt > BOARD_HEIGHT-4) ) {
+ if( (piece == WhitePawn || piece == WhiteQueen) && closure->rt > BOARD_HEIGHT-2 ||
+ piece == WhiteKnight && closure->rt > BOARD_HEIGHT-3) /* promotion mandatory */
+ closure->kind = c == '=' ? IllegalMove : WhitePromotionKnight;
+ else /* promotion optional, default is promote */
+ closure->kind = c == '=' ? NormalMove : WhitePromotionQueen;
+
+ } else closure->kind = (c == NULLCHAR || c == 'x' || c == '=') ?
+ NormalMove : IllegalMove;
+ } else {
+ if( (int) piece < (int) BlackWazir && (closure->rf < 3 || closure->rt < 3) ) {
+ if( (piece == BlackPawn || piece == BlackQueen) && closure->rt < 1 ||
+ piece == BlackKnight && closure->rt < 2 ) /* promotion obligatory */
+ closure->kind = c == '=' ? IllegalMove : BlackPromotionKnight;
+ else /* promotion optional, default is promote */
+ closure->kind = c == '=' ? NormalMove : BlackPromotionQueen;
+
+ } else closure->kind = (c == NULLCHAR || c == 'x' || c == '=') ?
+ NormalMove : IllegalMove;
+ }
+ }
+ } else
if (closure->promoCharIn != NULLCHAR && closure->promoCharIn != 'x') {
if (closure->kind == WhitePromotionQueen
|| closure->kind == BlackPromotionQueen) {
closure->kind = IllegalMove;
}
}
- closure->promoChar = ToLower(PieceToChar(PromoPiece(closure->kind)));
+ /* [HGM] returns 'q' for optional promotion, 'n' for mandatory */
+ if(closure->promoCharIn != '=')
+ closure->promoChar = ToLower(closure->promoCharIn);
+ else closure->promoChar = '=';
if (closure->promoChar == 'x') closure->promoChar = NULLCHAR;
if (closure->count > 1) {
closure->kind = AmbiguousMove;
*/
closure->kind = IllegalMove;
}
+ if(closure->kind == IllegalMove)
+ /* [HGM] might be a variant we don't understand, pass on promotion info */
+ closure->promoChar = ToLower(closure->promoCharIn);
+ if (appData.debugMode) {
+ fprintf(debugFP, "Disambiguate out: %d(%d,%d)-(%d,%d) = %d (%c)\n",
+ closure->piece,closure->ff,closure->rf,closure->ft,closure->rt,closure->promoChar,
+ closure->promoChar >= ' ' ? closure->promoChar:'-');
+ }
}
(CoordsToAlgebraicClosure *) closure;
if (rt == cl->rt && ft == cl->ft &&
- board[rf][ff] == cl->piece) {
+ (board[rf][ff] == cl->piece
+ || PieceToChar(board[rf][ff]) == '~' &&
+ (ChessSquare) (DEMOTED board[rf][ff]) == cl->piece)
+ ) {
if (rf == cl->rf) {
if (ff == cl->ff) {
cl->kind = kind; /* this is the move we want */
{
ChessSquare piece;
ChessMove kind;
- char *outp = out;
+ char *outp = out, c;
CoordsToAlgebraicClosure cl;
if (rf == DROP_RANK) {
/* Bughouse piece drop */
*outp++ = ToUpper(PieceToChar((ChessSquare) ff));
*outp++ = '@';
- *outp++ = ft + 'a';
- *outp++ = rt + '1';
+ *outp++ = ft + AAA;
+ if(rt+ONE <= '9')
+ *outp++ = rt + ONE;
+ else { *outp++ = (rt+ONE-'0')/10 + '0';*outp++ = (rt+ONE-'0')%10 + '0'; }
*outp = NULLCHAR;
return (flags & F_WHITE_ON_MOVE) ? WhiteDrop : BlackDrop;
}
if (promoChar == 'x') promoChar = NULLCHAR;
piece = board[rf][ff];
+ if(PieceToChar(piece)=='~') piece = (ChessSquare)(DEMOTED piece);
+
+ if (appData.debugMode)
+ fprintf(debugFP, "CoordsToAlgebraic, piece=%d (%d,%d)-(%d,%d) %c\n", (int)piece,ff,rf,ft,rt,promoChar >= ' ' ? promoChar : '-');
switch (piece) {
case WhitePawn:
case BlackPawn:
- kind = LegalityTest(board, flags, epfile, rf, ff, rt, ft, promoChar);
+ kind = LegalityTest(board, flags, epfile, initialRights, rf, ff, rt, ft, promoChar);
if (kind == IllegalMove && !(flags&F_IGNORE_CHECK)) {
/* Keep short notation if move is illegal only because it
leaves the player in check, but still return IllegalMove */
- kind = LegalityTest(board, flags|F_IGNORE_CHECK, epfile,
+ kind = LegalityTest(board, flags|F_IGNORE_CHECK, epfile, initialRights,
rf, ff, rt, ft, promoChar);
if (kind == IllegalMove) break;
kind = IllegalMove;
}
/* Pawn move */
- *outp++ = ff + 'a';
- if (ff == ft) {
+ *outp++ = ff + AAA;
+ if (ff == ft && board[rt][ft] == EmptySquare) { /* [HGM] Xiangqi has straight noncapts! */
/* Non-capture; use style "e5" */
- *outp++ = rt + '1';
+ if(rt+ONE <= '9')
+ *outp++ = rt + ONE;
+ else { *outp++ = (rt+ONE-'0')/10 + '0';*outp++ = (rt+ONE-'0')%10 + '0'; }
} else {
/* Capture; use style "exd5" */
- *outp++ = 'x';
- *outp++ = ft + 'a';
- *outp++ = rt + '1';
+ if(gameInfo.variant != VariantXiangqi || board[rt][ft] != EmptySquare )
+ *outp++ = 'x'; /* [HGM] Xiangqi has sideway noncaptures across river! */
+ *outp++ = ft + AAA;
+ if(rt+ONE <= '9')
+ *outp++ = rt + ONE;
+ else { *outp++ = (rt+ONE-'0')/10 + '0';*outp++ = (rt+ONE-'0')%10 + '0'; }
}
/* Use promotion suffix style "=Q" */
- if (promoChar != NULLCHAR && promoChar != 'x') {
- *outp++ = '=';
- *outp++ = ToUpper(promoChar);
- }
*outp = NULLCHAR;
- return kind;
+ if (appData.debugMode)
+ fprintf(debugFP, "movetype=%d, promochar=%d=%c\n", (int)kind, promoChar, promoChar >= ' ' ? promoChar : '-');
+ if (promoChar != NULLCHAR) {
+ if(gameInfo.variant == VariantShogi) {
+ /* [HGM] ... but not in Shogi! */
+ *outp++ = promoChar == '=' ? '=' : '+';
+ } else {
+ *outp++ = '=';
+ *outp++ = ToUpper(promoChar);
+ }
+ *outp = NULLCHAR;
+ }
+ return kind;
case WhiteKing:
case BlackKing:
+ /* Fabien moved code: FRC castling first (if KxR), wild castling second */
+ /* Code added by Tord: FRC castling. */
+ if((piece == WhiteKing && board[rt][ft] == WhiteRook) ||
+ (piece == BlackKing && board[rt][ft] == BlackRook)) {
+ if(ft > ff) strcpy(out, "O-O"); else strcpy(out, "O-O-O");
+ return LegalityTest(board, flags, epfile, initialRights,
+ rf, ff, rt, ft, promoChar);
+ }
+ /* End of code added by Tord */
/* Test for castling or ICS wild castling */
/* Use style "O-O" (oh-oh) for PGN compatibility */
- if (rf == rt &&
- rf == ((piece == WhiteKing) ? 0 : 7) &&
- ((ff == 4 && (ft == 2 || ft == 6)) ||
- (ff == 3 && (ft == 1 || ft == 5)))) {
- switch (ft) {
- case 1:
- case 6:
+ else if (rf == rt &&
+ rf == ((piece == WhiteKing) ? 0 : BOARD_HEIGHT-1) &&
+ ((ff == BOARD_WIDTH>>1 && (ft == BOARD_LEFT+2 || ft == BOARD_RGHT-2)) ||
+ (ff == (BOARD_WIDTH-1)>>1 && (ft == BOARD_LEFT+1 || ft == BOARD_RGHT-3)))) {
+ if(ft==BOARD_LEFT+1 || ft==BOARD_RGHT-2)
strcpy(out, "O-O");
- break;
- case 2:
- case 5:
+ else
strcpy(out, "O-O-O");
- break;
- }
+
/* This notation is always unambiguous, unless there are
kings on both the d and e files, with "wild castling"
possible for the king on the d file and normal castling
this situation. So I am not going to worry about it;
I'll just generate an ambiguous O-O in this case.
*/
- return LegalityTest(board, flags, epfile,
+ return LegalityTest(board, flags, epfile, initialRights,
rf, ff, rt, ft, promoChar);
}
+
/* else fall through */
-
default:
/* Piece move */
cl.rf = rf;
cl.piece = piece;
cl.kind = IllegalMove;
cl.rank = cl.file = cl.either = 0;
- GenLegal(board, flags, epfile,
+ GenLegal(board, flags, epfile, initialRights,
CoordsToAlgebraicCallback, (VOIDSTAR) &cl);
if (cl.kind == IllegalMove && !(flags&F_IGNORE_CHECK)) {
/* Generate pretty moves for moving into check, but
still return IllegalMove.
*/
- GenLegal(board, flags|F_IGNORE_CHECK, epfile,
+ GenLegal(board, flags|F_IGNORE_CHECK, epfile, initialRights,
CoordsToAlgebraicCallback, (VOIDSTAR) &cl);
if (cl.kind == IllegalMove) break;
cl.kind = IllegalMove;
else "N1f3" or "N5xf7",
else "Ng1f3" or "Ng5xf7".
*/
- *outp++ = ToUpper(PieceToChar(piece));
-
+ c = PieceToChar(piece) ;
+ if( c == '~' || c == '+') {
+ /* [HGM] print nonexistent piece as its demoted version */
+ piece = (ChessSquare) (DEMOTED piece);
+ }
+ if(c=='+') *outp++ = c;
+ *outp++ = ToUpper(PieceToChar(piece));
+
if (cl.file || (cl.either && !cl.rank)) {
- *outp++ = ff + 'a';
+ *outp++ = ff + AAA;
}
if (cl.rank) {
- *outp++ = rf + '1';
+ if(rf+ONE <= '9')
+ *outp++ = rf + ONE;
+ else { *outp++ = (rf+ONE-'0')/10 + '0';*outp++ = (rf+ONE-'0')%10 + '0'; }
}
if(board[rt][ft] != EmptySquare)
*outp++ = 'x';
- *outp++ = ft + 'a';
- *outp++ = rt + '1';
+ *outp++ = ft + AAA;
+ if(rt+ONE <= '9')
+ *outp++ = rt + ONE;
+ else { *outp++ = (rt+ONE-'0')/10 + '0';*outp++ = (rt+ONE-'0')%10 + '0'; }
*outp = NULLCHAR;
- return cl.kind;
+ if (gameInfo.variant == VariantShogi) {
+ /* [HGM] in Shogi non-pawns can promote */
+ if(flags & F_WHITE_ON_MOVE) {
+ if( (int) cl.piece < (int) WhiteWazir &&
+ (rf > BOARD_HEIGHT-4 || rt > BOARD_HEIGHT-4) ) {
+ if( (piece == WhitePawn || piece == WhiteQueen) && rt > BOARD_HEIGHT-2 ||
+ piece == WhiteKnight && rt > BOARD_HEIGHT-3) /* promotion mandatory */
+ cl.kind = promoChar == '=' ? IllegalMove : WhitePromotionKnight;
+ else cl.kind = WhitePromotionQueen; /* promotion optional */
+
+ } else cl.kind = (promoChar == NULLCHAR || promoChar == 'x' || promoChar == '=') ?
+ NormalMove : IllegalMove;
+ } else {
+ if( (int) cl.piece < (int) BlackWazir && (rf < 3 || rt < 3) ) {
+ if( (piece == BlackPawn || piece == BlackQueen) && rt < 1 ||
+ piece == BlackKnight && rt < 2 ) /* promotion obligatory */
+ cl.kind = promoChar == '=' ? IllegalMove : BlackPromotionKnight;
+ else cl.kind = BlackPromotionQueen; /* promotion optional */
+ } else cl.kind = (promoChar == NULLCHAR || promoChar == 'x' || promoChar == '=') ?
+ NormalMove : IllegalMove;
+ }
+ if(cl.kind == WhitePromotionQueen || cl.kind == BlackPromotionQueen) {
+ /* for optional promotions append '+' or '=' */
+ if(promoChar == '=') {
+ *outp++ = '=';
+ cl.kind = NormalMove;
+ } else *outp++ = '+';
+ *outp = NULLCHAR;
+ } else if(cl.kind == IllegalMove) {
+ /* Illegal move specifies any given promotion */
+ if(promoChar != NULLCHAR && promoChar != 'x') {
+ *outp++ = '=';
+ *outp++ = ToUpper(promoChar);
+ *outp = NULLCHAR;
+ }
+ }
+ }
+ return cl.kind;
+ /* [HGM] Always long notation for fairies we don't know */
+ case WhiteFalcon:
+ case BlackFalcon:
+ case WhiteLance:
+ case BlackLance:
+ case WhiteGrasshopper:
+ case BlackGrasshopper:
case EmptySquare:
/* Moving a nonexistent piece */
break;
if (piece != EmptySquare && piece != WhitePawn && piece != BlackPawn) {
*outp++ = ToUpper(PieceToChar(piece));
}
- *outp++ = ff + 'a';
- *outp++ = rf + '1';
+ *outp++ = ff + AAA;
+ if(rf+ONE <= '9')
+ *outp++ = rf + ONE;
+ else { *outp++ = (rf+ONE-'0')/10 + '0';*outp++ = (rf+ONE-'0')%10 + '0'; }
if (board[rt][ft] != EmptySquare) *outp++ = 'x';
- *outp++ = ft + 'a';
- *outp++ = rt + '1';
+ *outp++ = ft + AAA;
+ if(rt+ONE <= '9')
+ *outp++ = rt + ONE;
+ else { *outp++ = (rt+ONE-'0')/10 + '0';*outp++ = (rt+ONE-'0')%10 + '0'; }
/* Use promotion suffix style "=Q" */
if (promoChar != NULLCHAR && promoChar != 'x') {
*outp++ = '=';
return IllegalMove;
}
+
+// [HGM] XQ: the following code serves to detect perpetual chasing (Asian rules)
+
+typedef struct {
+ /* Input */
+ int rf, ff, rt, ft;
+ /* Output */
+ int recaptures;
+} ChaseClosure;
+
+// I guess the following variables logically belong in the closure too, but I was too lazy and used globals
+
+int preyStackPointer, chaseStackPointer;
+
+struct {
+char rf, ff, rt, ft;
+} chaseStack[100];
+
+struct {
+char rank, file;
+} preyStack[100];
+
+
+
+
+// there are three new callbacks for use with GenLegal: for adding captures, deleting them, and finding a recapture
+
+extern void AtacksCallback P((Board board, int flags, ChessMove kind,
+ int rf, int ff, int rt, int ft,
+ VOIDSTAR closure));
+
+void AttacksCallback(board, flags, kind, rf, ff, rt, ft, closure)
+ Board board;
+ int flags;
+ ChessMove kind;
+ int rf, ff, rt, ft;
+ VOIDSTAR closure;
+{ // For adding captures that can lead to chase indictment to the chaseStack
+ if(board[rt][ft] == EmptySquare) return; // non-capture
+ if(board[rt][ft] == WhitePawn && rt < BOARD_HEIGHT/2) return; // Pawn before river can be chased
+ if(board[rt][ft] == BlackPawn && rt >= BOARD_HEIGHT/2) return; // Pawn before river can be chased
+ if(board[rf][ff] == WhitePawn || board[rf][ff] == BlackPawn) return; // Pawns are allowed to chase
+ if(board[rf][ff] == WhiteWazir || board[rf][ff] == BlackWazir) return; // King is allowed to chase
+ // move cannot be excluded from being a chase trivially (based on attacker and victim); save it on chaseStack
+ chaseStack[chaseStackPointer].rf = rf;
+ chaseStack[chaseStackPointer].ff = ff;
+ chaseStack[chaseStackPointer].rt = rt;
+ chaseStack[chaseStackPointer].ft = ft;
+ chaseStackPointer++;
+}
+
+extern void ExistingAtacksCallback P((Board board, int flags, ChessMove kind,
+ int rf, int ff, int rt, int ft,
+ VOIDSTAR closure));
+
+void ExistingAttacksCallback(board, flags, kind, rf, ff, rt, ft, closure)
+ Board board;
+ int flags;
+ ChessMove kind;
+ int rf, ff, rt, ft;
+ VOIDSTAR closure;
+{ // for removing pre-exsting captures from the chaseStack, to be left with newly created ones
+ int i;
+ register ChaseClosure *cl = (ChaseClosure *) closure; //closure tells us the move played in the repeat loop
+
+ if(board[rt][ft] == EmptySquare) return; // no capture
+ if(rf == cl->rf && ff == cl->ff) { // attacks with same piece from new position are not considered new
+ rf = cl->rt; ff = cl->ft; // doctor their fromSquare so they will be recognized in chaseStack
+ }
+ // search move in chaseStack, and delete it if it occurred there (as we know now it is not a new capture)
+ for(i=0; i<chaseStackPointer; i++) {
+ if(chaseStack[i].rf == rf && chaseStack[i].ff == ff &&
+ chaseStack[i].rt == rt && chaseStack[i].ft == ft ) {
+ // move found on chaseStack, delete it by overwriting with move popped from top of chaseStack
+ chaseStack[i] = chaseStack[--chaseStackPointer];
+ break;
+ }
+ }
+}
+
+extern void ProtectedCallback P((Board board, int flags, ChessMove kind,
+ int rf, int ff, int rt, int ft,
+ VOIDSTAR closure));
+
+void ProtectedCallback(board, flags, kind, rf, ff, rt, ft, closure)
+ Board board;
+ int flags;
+ ChessMove kind;
+ int rf, ff, rt, ft;
+ VOIDSTAR closure;
+{ // for determining if a piece (given through the closure) is protected
+ register ChaseClosure *cl = (ChaseClosure *) closure; // closure tells us where to recapture
+
+ if(rt == cl->rt && ft == cl->ft) cl->recaptures++; // count legal recaptures to this square
+ if(appData.debugMode && board[rt][ft] != EmptySquare)
+ fprintf(debugFP, "try %c%c%c%c=%d\n", ff+AAA, rf+ONE,ft+AAA, rt+ONE, cl->recaptures);
+}
+
+extern char moveList[MAX_MOVES][MOVE_LEN];
+
+int PerpetualChase(int first, int last)
+{ // this routine detects if the side to move in the 'first' position is perpetually chasing (when not checking)
+ int i, j, k, tail;
+ ChaseClosure cl;
+ ChessSquare captured;
+
+ preyStackPointer = 0; // clear stack of chased pieces
+ for(i=first; i<last; i+=2) { // for all positions with same side to move
+ if(appData.debugMode) fprintf(debugFP, "judge position %i\n", i);
+ chaseStackPointer = 0; // clear stack that is going to hold possible chases
+ // determine all captures possible after the move, and put them on chaseStack
+ GenLegal(boards[i+1], PosFlags(i), EP_NONE, initialRights, AttacksCallback, &cl);
+ if(appData.debugMode) { int n;
+ for(n=0; n<chaseStackPointer; n++)
+ fprintf(debugFP, "%c%c%c%c ", chaseStack[n].ff+AAA, chaseStack[n].rf+ONE,
+ chaseStack[n].ft+AAA, chaseStack[n].rt+ONE);
+ fprintf(debugFP, ": all capts\n");
+ }
+ // determine all captures possible before the move, and delete them from chaseStack
+ cl.rf = moveList[i][1]-ONE; // prepare closure to pass move that led from i to i+1
+ cl.ff = moveList[i][0]-AAA+BOARD_LEFT;
+ cl.rt = moveList[i][3]-ONE;
+ cl.ft = moveList[i][2]-AAA+BOARD_LEFT;
+ GenLegal(boards[i], PosFlags(i), EP_NONE, initialRights, ExistingAttacksCallback, &cl);
+ if(appData.debugMode) { int n;
+ for(n=0; n<chaseStackPointer; n++)
+ fprintf(debugFP, "%c%c%c%c ", chaseStack[n].ff+AAA, chaseStack[n].rf+ONE,
+ chaseStack[n].ft+AAA, chaseStack[n].rt+ONE);
+ fprintf(debugFP, ": new capts after %c%c%c%c\n", cl.ff+AAA, cl.rf+ONE, cl.ft+AAA, cl.rt+ONE);
+ }
+ // chaseSack now contains all captures made possible by the move
+ for(j=0; j<chaseStackPointer; j++) { // run through chaseStack to identify true chases
+ int attacker = (int)boards[i+1][chaseStack[j].rf][chaseStack[j].ff];
+ int victim = (int)boards[i+1][chaseStack[j].rt][chaseStack[j].ft];
+
+ if(attacker >= (int) BlackPawn) attacker = BLACK_TO_WHITE attacker; // convert to white, as piecee type
+ if(victim >= (int) BlackPawn) victim = BLACK_TO_WHITE victim;
+
+ if((attacker == WhiteKnight || attacker == WhiteCannon) && victim == WhiteRook)
+ continue; // C or H attack on R is always chase; leave on chaseStack
+
+ if(attacker == victim) {
+ if(LegalityTest(boards[i+1], PosFlags(i+1), EP_NONE, initialRights, chaseStack[j].rt,
+ chaseStack[j].ft, chaseStack[j].rf, chaseStack[j].ff, NULLCHAR) == NormalMove) {
+ // we can capture back with equal piece, so this is no chase but a sacrifice
+ chaseStack[j] = chaseStack[--chaseStackPointer]; // delete the capture from the chaseStack
+ j--; /* ! */ continue;
+ }
+
+ }
+
+ // the attack is on a lower piece, or on a pinned or blocked equal one
+ // test if the victim is protected by a true protector. First make the capture.
+ captured = boards[i+1][chaseStack[j].rt][chaseStack[j].ft];
+ boards[i+1][chaseStack[j].rt][chaseStack[j].ft] = boards[i+1][chaseStack[j].rf][chaseStack[j].ff];
+ boards[i+1][chaseStack[j].rf][chaseStack[j].ff] = EmptySquare;
+ // Then test if the opponent can recapture
+ cl.recaptures = 0; // prepare closure to pass recapture square and count moves to it
+ cl.rt = chaseStack[j].rt;
+ cl.ft = chaseStack[j].ft;
+ if(appData.debugMode) {
+ fprintf(debugFP, "test if we can recapture %c%c\n", cl.ft+AAA, cl.rt+ONE);
+ }
+ GenLegal(boards[i+1], PosFlags(i+1), EP_NONE, initialRights, ProtectedCallback, &cl); // try all moves
+ // unmake the capture
+ boards[i+1][chaseStack[j].rf][chaseStack[j].ff] = boards[i+1][chaseStack[j].rt][chaseStack[j].ft];
+ boards[i+1][chaseStack[j].rt][chaseStack[j].ft] = captured;
+ // if a recapture was found, piece is protected, and we are not chasing it.
+ if(cl.recaptures) { // attacked piece was defended by true protector, no chase
+ chaseStack[j] = chaseStack[--chaseStackPointer]; // so delete from chaseStack
+ j--; /* ! */
+ }
+ }
+ // chaseStack now contains all moves that chased
+ if(appData.debugMode) { int n;
+ for(n=0; n<chaseStackPointer; n++)
+ fprintf(debugFP, "%c%c%c%c ", chaseStack[n].ff+AAA, chaseStack[n].rf+ONE,
+ chaseStack[n].ft+AAA, chaseStack[n].rt+ONE);
+ fprintf(debugFP, ": chases\n");
+ }
+ if(i == first) { // copy all people chased by first move of repeat cycle to preyStack
+ for(j=0; j<chaseStackPointer; j++) {
+ preyStack[j].rank = chaseStack[j].rt;
+ preyStack[j].file = chaseStack[j].ft;
+ }
+ preyStackPointer = chaseStackPointer;
+ }
+ tail = 0;
+ for(j=0; j<chaseStackPointer; j++) {
+ for(k=0; k<preyStackPointer; k++) {
+ // search the victim of each chase move on the preyStack (first occurrence)
+ if(chaseStack[j].ft == preyStack[k].file && chaseStack[j].rt == preyStack[k].rank ) {
+ if(k < tail) break; // piece was already identified as still being chased
+ preyStack[preyStackPointer] = preyStack[tail]; // move chased piece to bottom part of preyStack
+ preyStack[tail] = preyStack[k]; // by swapping
+ preyStack[k] = preyStack[preyStackPointer];
+ tail++;
+ break;
+ }
+ }
+ }
+ preyStackPointer = tail; // keep bottom part of preyStack, popping pieces unchased on move i.
+ if(appData.debugMode) { int n;
+ for(n=0; n<preyStackPointer; n++)
+ fprintf(debugFP, "%c%c ", preyStack[n].file+AAA, preyStack[n].rank+ONE);
+ fprintf(debugFP, "always chased upto ply %d\n", i);
+ }
+ // now adjust the location of the chased pieces according to opponent move
+ for(j=0; j<preyStackPointer; j++) {
+ if(preyStack[j].rank == moveList[i+1][1]-ONE &&
+ preyStack[j].file == moveList[i+1][0]-AAA+BOARD_LEFT) {
+ preyStack[j].rank = moveList[i+1][3]-ONE;
+ preyStack[j].file = moveList[i+1][2]-AAA+BOARD_LEFT;
+ break;
+ }
+ }
+ }
+ return preyStackPointer; // if any piece was left on preyStack, it has been perpetually chased
+}
projects / xboard.git / blobdiff