X-Git-Url: http://winboard.nl/cgi-bin?a=blobdiff_plain;f=moves.c;h=0de99f7fd9a148bb77a435338cd6d36b0fae83a9;hb=37266870c73e9be76c84d0f097ebee25ad17ebdf;hp=edccef83673c0ce69852c8501a12fccb2ac03f0f;hpb=86517e539f33650be656c482020a878fec0723c9;p=xboard.git diff --git a/moves.c b/moves.c index edccef8..a53ca59 100644 --- a/moves.c +++ b/moves.c @@ -1,1602 +1,2718 @@ -/* - * moves.c - Move generation and checking - * $Id: moves.c,v 2.1 2003/10/27 19:21:00 mann Exp $ - * - * Copyright 1991 by Digital Equipment Corporation, Maynard, Massachusetts. - * Enhancements Copyright 1992-95 Free Software Foundation, Inc. - * - * 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: - * ------------------------------------------------------------------------ - * This program 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. - * - * 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. - * - * 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. - * ------------------------------------------------------------------------ - */ - -#include "config.h" - -#include -#if HAVE_STRING_H -# include -#else /* not HAVE_STRING_H */ -# include -#endif /* not HAVE_STRING_H */ -#include "common.h" -#include "backend.h" -#include "moves.h" -#include "parser.h" - -int WhitePiece P((ChessSquare)); -int BlackPiece P((ChessSquare)); -int SameColor P((ChessSquare, ChessSquare)); - -extern char initialRights[BOARD_SIZE]; /* [HGM] all rights enabled, set in InitPosition */ - - -int WhitePiece(piece) - ChessSquare piece; -{ - return (int) piece >= (int) WhitePawn && (int) piece < (int) BlackPawn; -} - -int BlackPiece(piece) - ChessSquare piece; -{ - return (int) piece >= (int) BlackPawn && (int) piece < (int) EmptySquare; -} - -int SameColor(piece1, piece2) - ChessSquare piece1, piece2; -{ - return ((int) piece1 >= (int) WhitePawn && /* [HGM] can be > King ! */ - (int) piece1 < (int) BlackPawn && - (int) piece2 >= (int) WhitePawn && - (int) piece2 < (int) BlackPawn) - || ((int) piece1 >= (int) BlackPawn && - (int) piece1 < (int) EmptySquare && - (int) piece2 >= (int) BlackPawn && - (int) piece2 < (int) EmptySquare); -} - -ChessSquare PromoPiece(moveType) - ChessMove moveType; -{ - switch (moveType) { - default: - return EmptySquare; - case WhitePromotionQueen: - return WhiteQueen; - case BlackPromotionQueen: - return BlackQueen; - case WhitePromotionRook: - return WhiteRook; - case BlackPromotionRook: - return BlackRook; - case WhitePromotionBishop: - return WhiteBishop; - case BlackPromotionBishop: - return BlackBishop; - case WhitePromotionKnight: - return WhiteKnight; - case BlackPromotionKnight: - return BlackKnight; - case WhitePromotionKing: - return WhiteKing; - case BlackPromotionKing: - return BlackKing; -#ifdef FAIRY - case WhitePromotionChancellor: - return WhiteMarshall; - case BlackPromotionChancellor: - return BlackMarshall; - case WhitePromotionArchbishop: - return WhiteCardinal; - case BlackPromotionArchbishop: - return BlackCardinal; -#endif - } -} - -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; -#ifdef FAIRY - case 'a': - case 'A': - return WhitePromotionArchbishop; - case 'c': - case 'C': - return WhitePromotionChancellor; -#endif - 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; -#ifdef FAIRY - case 'a': - case 'A': - return BlackPromotionArchbishop; - case 'c': - case 'C': - return BlackPromotionChancellor; -#endif - case 'q': - case 'Q': - return BlackPromotionQueen; - case 'k': - case 'K': - return BlackPromotionKing; - case NULLCHAR: - default: - return NormalMove; - } - } -} - -char pieceToChar[] = { - 'P', 'N', 'B', 'R', 'Q', 'F', 'E', 'A', 'C', 'W', 'M', - 'O', 'H', 'I', 'J', 'G', 'D', 'V', 'S', 'L', 'U', 'K', - 'p', 'n', 'b', 'r', 'q', 'f', 'e', 'a', 'c', 'w', 'm', - 'o', 'h', 'i', 'j', 'g', 'd', 'v', 's', 'l', '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; -{ - int i; - for(i=0; i< (int) EmptySquare; i++) - if(pieceToChar[i] == c) return (ChessSquare) i; - return EmptySquare; -} - -void CopyBoard(to, from) - Board to, from; -{ - int i, j; - - for (i = 0; i < BOARD_HEIGHT; i++) - for (j = 0; j < BOARD_WIDTH; j++) - to[i][j] = from[i][j]; -} - -int CompareBoards(board1, board2) - Board board1, board2; -{ - int i, j; - - for (i = 0; i < BOARD_HEIGHT; i++) - for (j = 0; j < BOARD_WIDTH; j++) { - if (board1[i][j] != board2[i][j]) - return FALSE; - } - return TRUE; -} - - -/* Call callback once for each pseudo-legal move in the given - position, except castling moves. A move is pseudo-legal if it is - legal, or if it would be legal except that it leaves the king in - check. In the arguments, epfile is EP_NONE if the previous move - was not a double pawn push, or the file 0..7 if it was, or - EP_UNKNOWN if we don't know and want to allow all e.p. captures. - Promotion moves generated are to Queen only. -*/ -void GenPseudoLegal(board, flags, epfile, callback, closure) - Board board; - int flags; - int epfile; - MoveCallback callback; - VOIDSTAR closure; -{ - int rf, ff; - 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; - - if (flags & F_WHITE_ON_MOVE) { - if (!WhitePiece(board[rf][ff])) continue; - } else { - if (!BlackPiece(board[rf][ff])) continue; - } - 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 ([HGM] except for faries...) */ - break; - - 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 == BOARD_HEIGHT-2 ? WhitePromotionQueen : NormalMove, - rf, ff, rf + 1, ff, closure); - } - if (rf == 1 && board[2][ff] == EmptySquare && - 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 < 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 == BOARD_HEIGHT-2 ? WhitePromotionQueen : NormalMove, - rf, ff, rf + 1, ff + s, closure); - } - if (rf == BOARD_HEIGHT-4) { - if (ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT && - (epfile == ff + s || epfile == EP_UNKNOWN) && - 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 == 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, BOARD_HEIGHT-4, ff, closure); - } - for (s = -1; s <= 1; s += 2) { - 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 == 1 ? BlackPromotionQueen : NormalMove, - rf, ff, rf - 1, ff + s, closure); - } - if (rf == 3) { - 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) { - callback(board, flags, BlackCapturesEnPassant, - rf, ff, 2, ff + s, closure); - } - } - } - 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 >= 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 (i = 1;; i++) { - rt = rf + (i * rs); - ft = ff + (i * fs); - 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 (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 (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 walking; - break; - - case WhiteQueen: - case BlackQueen: - for (rs = -1; rs <= 1; rs++) - for (fs = -1; fs <= 1; fs++) { - if (rs == 0 && fs == 0) continue; - for (i = 1;; i++) { - rt = rf + (i * rs); - ft = ff + (i * fs); - 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; - - /* 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 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 >= 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); - } - 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; - - } - } -} - - -typedef struct { - MoveCallback cb; - VOIDSTAR cl; -} GenLegalClosure; - -extern void GenLegalCallback P((Board board, int flags, ChessMove kind, - int rf, int ff, int rt, int ft, - VOIDSTAR closure)); - -void GenLegalCallback(board, flags, kind, rf, ff, rt, ft, closure) - Board board; - int flags; - ChessMove kind; - int rf, ff, rt, ft; - VOIDSTAR closure; -{ - register GenLegalClosure *cl = (GenLegalClosure *) closure; - - if (!(flags & F_IGNORE_CHECK) && - CheckTest(board, flags, rf, ff, rt, ft, - kind == WhiteCapturesEnPassant || - kind == BlackCapturesEnPassant)) return; - if (flags & F_ATOMIC_CAPTURE) { - if (board[rt][ft] != EmptySquare || - kind == WhiteCapturesEnPassant || kind == BlackCapturesEnPassant) { - int r, f; - ChessSquare king = (flags & F_WHITE_ON_MOVE) ? WhiteKing : BlackKing; - 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 < BOARD_HEIGHT && f >= BOARD_LEFT && f < BOARD_RGHT && - board[r][f] == king) return; - } - } - } - } - cl->cb(board, flags, kind, rf, ff, rt, ft, cl->cl); -} - - -typedef struct { - int rf, ff, rt, ft; - ChessMove kind; -} 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. [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, ft, k, left, right; - int ignoreCheck = (flags & F_IGNORE_CHECK) != 0; - ChessSquare wKing = WhiteKing, bKing = BlackKing; - - cl.cb = callback; - cl.cl = closure; - GenPseudoLegal(board, flags, epfile, GenLegalCallback, (VOIDSTAR) &cl); - - if (!ignoreCheck && - CheckTest(board, flags, -1, -1, -1, -1, FALSE)) return TRUE; - - /* Generate castling moves */ - 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] == 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==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] == wKing && - board[0][ff - 1] == EmptySquare && - board[0][ff - 2] == EmptySquare && - 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==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[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, 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==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[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, 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==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= 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= 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; -} - - -typedef struct { - int rking, fking; - int check; -} CheckTestClosure; - - -extern void CheckTestCallback P((Board board, int flags, ChessMove kind, - int rf, int ff, int rt, int ft, - VOIDSTAR closure)); - - -void CheckTestCallback(board, flags, kind, rf, ff, rt, ft, closure) - Board board; - int flags; - ChessMove kind; - int rf, ff, rt, ft; - VOIDSTAR closure; -{ - register CheckTestClosure *cl = (CheckTestClosure *) closure; - - if (rt == cl->rking && ft == cl->fking) cl->check++; -} - - -/* If the player on move were to move from (rf, ff) to (rt, ft), would - he leave himself in check? Or if rf == -1, is the player on move - in check now? enPassant must be TRUE if the indicated move is an - e.p. capture. The possibility of castling out of a check along the - back rank is not accounted for (i.e., we still return nonzero), as - this is illegal anyway. Return value is the number of times the - king is in check. */ -int CheckTest(board, flags, rf, ff, rt, ft, enPassant) - Board board; - int flags; - int rf, ff, rt, ft, enPassant; -{ - CheckTestClosure cl; - ChessSquare king = flags & F_WHITE_ON_MOVE ? WhiteKing : BlackKing; - 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]; - board[rf][ft] = EmptySquare; - } else { - captured = board[rt][ft]; - } - board[rt][ft] = board[rf][ff]; - board[rf][ff] = EmptySquare; - } - - /* For compatibility with ICS wild 9, we scan the board in the - 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 = 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=0 && i0 ? BlackWazir : WhiteWazir) ) - cl.check++; - } - - GenPseudoLegal(board, flags ^ F_WHITE_ON_MOVE, -1, - CheckTestCallback, (VOIDSTAR) &cl); - goto undo_move; /* 2-level break */ - } - } - - undo_move: - - if (rf >= 0) { - board[rf][ff] = board[rt][ft]; - if (enPassant) { - board[rf][ft] = captured; - board[rt][ft] = EmptySquare; - } else { - board[rt][ft] = captured; - } - } - - return cl.check; -} - - -extern void LegalityTestCallback P((Board board, int flags, ChessMove kind, - int rf, int ff, int rt, int ft, - VOIDSTAR closure)); - -void LegalityTestCallback(board, flags, kind, rf, ff, rt, ft, closure) - Board board; - int flags; - ChessMove kind; - int rf, ff, rt, 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 (rf == cl->rf && ff == cl->ff && rt == cl->rt && ft == cl->ft) - cl->kind = kind; -} - -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; 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 NormalMove; - - cl.rf = rf; - cl.ff = ff; - cl.rt = rt; - cl.ft = ft; - cl.kind = IllegalMove; - GenLegal(board, flags, epfile, castlingRights, LegalityTestCallback, (VOIDSTAR) &cl); - - 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 (cl.kind == WhitePromotionQueen || cl.kind == BlackPromotionQueen) { - cl.kind = - PromoCharToMoveType((flags & F_WHITE_ON_MOVE) != 0, promoChar); - } else { - cl.kind = IllegalMove; - } - } - /* [HGM] For promotions, 'ToQueen' = optional, 'ToKnight' = mandatory */ - return cl.kind; -} - -typedef struct { - int count; -} MateTestClosure; - -extern void MateTestCallback P((Board board, int flags, ChessMove kind, - int rf, int ff, int rt, int ft, - VOIDSTAR closure)); - -void MateTestCallback(board, flags, kind, rf, ff, rt, ft, closure) - Board board; - int flags; - ChessMove kind; - int rf, ff, rt, ft; - VOIDSTAR closure; -{ - register MateTestClosure *cl = (MateTestClosure *) closure; - - cl->count++; -} - -/* Return MT_NONE, MT_CHECK, MT_CHECKMATE, or MT_STALEMATE */ -int MateTest(board, flags, epfile, castlingRights) - Board board; - int flags, epfile; - char castlingRights[]; -{ - MateTestClosure cl; - int inCheck; - - cl.count = 0; - inCheck = GenLegal(board, flags, epfile, castlingRights, MateTestCallback, (VOIDSTAR) &cl); - if (cl.count > 0) { - return inCheck ? MT_CHECK : MT_NONE; - } else { - return inCheck || gameInfo.variant == VariantXiangqi || gameInfo.variant == VariantShatranj ? - MT_CHECKMATE : MT_STALEMATE; - } -} - - -extern void DisambiguateCallback P((Board board, int flags, ChessMove kind, - int rf, int ff, int rt, int ft, - VOIDSTAR closure)); - -void DisambiguateCallback(board, flags, kind, rf, ff, rt, ft, closure) - Board board; - int flags; - ChessMove kind; - int rf, ff, rt, ft; - VOIDSTAR closure; -{ - register DisambiguateClosure *cl = (DisambiguateClosure *) closure; - - 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->count++; - cl->piece = board[rf][ff]; - cl->rf = rf; - cl->ff = ff; - cl->rt = rt; - cl->ft = ft; - cl->kind = kind; - } -} - -void Disambiguate(board, flags, epfile, closure) - Board board; - int flags, epfile; - DisambiguateClosure *closure; -{ - int illegal = 0; char c = closure->promoCharIn; - closure->count = 0; - closure->rf = closure->ff = closure->rt = closure->ft = 0; - closure->kind = ImpossibleMove; - 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, 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; jkind = IllegalMove; - else if(flags & F_WHITE_ON_MOVE) { -#if 0 - if (appData.debugMode) { - fprintf(debugFP, "Disambiguate B: %d(%d,%d)-(%d,%d) = %d (%c)\n", - closure->pieceIn,closure->ffIn,closure->rfIn,closure->ftIn,closure->rtIn, - closure->promoCharIn,closure->promoCharIn); - } -#endif - 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 = - PromoCharToMoveType((flags & F_WHITE_ON_MOVE) != 0, - closure->promoCharIn); - } else { - closure->kind = IllegalMove; - } - } -#if 0 - if (appData.debugMode) { - fprintf(debugFP, "Disambiguate C: %d(%d,%d)-(%d,%d) = %d (%c)\n", - closure->pieceIn,closure->ffIn,closure->rfIn,closure->ftIn,closure->rtIn, - closure->promoCharIn,closure->promoCharIn); - } -#endif - /* [HGM] returns 'q' for optional promotion, 'n' for mandatory */ - if(closure->promoCharIn != '=') - closure->promoChar = ToLower(PieceToChar(PromoPiece(closure->kind))); - else closure->promoChar = '='; - if (closure->promoChar == 'x') closure->promoChar = NULLCHAR; - if (closure->count > 1) { - closure->kind = AmbiguousMove; - } - if (illegal) { - /* Note: If more than one illegal move matches, but no legal - moves, we return IllegalMove, not AmbiguousMove. Caller - can look at closure->count to detect this. - */ - closure->kind = IllegalMove; - } - if(closure->kind == IllegalMove) - /* [HGM] might be a variant we don't understand, pass on promotion info */ - closure->promoChar = 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:'-'); - } -} - - -typedef struct { - /* Input */ - ChessSquare piece; - int rf, ff, rt, ft; - /* Output */ - ChessMove kind; - int rank; - int file; - int either; -} CoordsToAlgebraicClosure; - -extern void CoordsToAlgebraicCallback P((Board board, int flags, - ChessMove kind, int rf, int ff, - int rt, int ft, VOIDSTAR closure)); - -void CoordsToAlgebraicCallback(board, flags, kind, rf, ff, rt, ft, closure) - Board board; - int flags; - ChessMove kind; - int rf, ff, rt, ft; - VOIDSTAR closure; -{ - register CoordsToAlgebraicClosure *cl = - (CoordsToAlgebraicClosure *) closure; - - if (rt == cl->rt && ft == cl->ft && - (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 */ - } else { - cl->file++; /* need file to rule out this move */ - } - } else { - if (ff == cl->ff) { - cl->rank++; /* need rank to rule out this move */ - } else { - cl->either++; /* rank or file will rule out this move */ - } - } - } -} - -/* Convert coordinates to normal algebraic notation. - promoChar must be NULLCHAR or 'x' if not a promotion. -*/ -ChessMove CoordsToAlgebraic(board, flags, epfile, - rf, ff, rt, ft, promoChar, out) - Board board; - int flags, epfile; - int rf, ff, rt, ft; - int promoChar; - char out[MOVE_LEN]; -{ - ChessSquare piece; - ChessMove kind; - char *outp = out, c; - CoordsToAlgebraicClosure cl; - - if (rf == DROP_RANK) { - /* Bughouse piece drop */ - *outp++ = ToUpper(PieceToChar((ChessSquare) ff)); - *outp++ = '@'; - *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, 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, initialRights, - rf, ff, rt, ft, promoChar); - if (kind == IllegalMove) break; - kind = IllegalMove; - } - /* Pawn move */ - *outp++ = ff + AAA; - if (ff == ft && board[rt][ft] == EmptySquare) { /* [HGM] Xiangqi has straight noncapts! */ - /* Non-capture; use style "e5" */ - 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" */ - 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" */ - *outp = NULLCHAR; - 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 */ - 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"); - else - strcpy(out, "O-O-O"); - - /* 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 - possible for the other. ICS rules for wild 9 - effectively make castling illegal for either king in - 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, initialRights, - rf, ff, rt, ft, promoChar); - } - - /* else fall through */ - default: - /* Piece move */ - cl.rf = rf; - cl.ff = ff; - cl.rt = rt; - cl.ft = ft; - cl.piece = piece; - cl.kind = IllegalMove; - cl.rank = cl.file = cl.either = 0; - 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, initialRights, - CoordsToAlgebraicCallback, (VOIDSTAR) &cl); - if (cl.kind == IllegalMove) break; - cl.kind = IllegalMove; - } - - /* Style is "Nf3" or "Nxf7" if this is unambiguous, - else "Ngf3" or "Ngxf7", - else "N1f3" or "N5xf7", - else "Ng1f3" or "Ng5xf7". - */ - 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 + AAA; - } - if (cl.rank) { - 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 + AAA; - if(rt+ONE <= '9') - *outp++ = rt + ONE; - else { *outp++ = (rt+ONE-'0')/10 + '0';*outp++ = (rt+ONE-'0')%10 + '0'; } - *outp = NULLCHAR; - 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 WhiteSilver: - case BlackSilver: - case WhiteLance: - case BlackLance: - case WhiteGrasshopper: - case BlackGrasshopper: - case EmptySquare: - /* Moving a nonexistent piece */ - break; - } - - /* Not a legal move, even ignoring check. - If there was a piece on the from square, - use style "Ng1g3" or "Ng1xe8"; - if there was a pawn or nothing (!), - use style "g1g3" or "g1xe8". Use "x" - if a piece was on the to square, even - a piece of the same color. - */ - outp = out; - if (piece != EmptySquare && piece != WhitePawn && piece != BlackPawn) { - *outp++ = ToUpper(PieceToChar(piece)); - } - *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 + 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 IllegalMove; -} - - +/* + * moves.c - Move generation and checking + * + * Copyright 1991 by Digital Equipment Corporation, Maynard, + * Massachusetts. + * + * Enhancements Copyright 1992-2001, 2002, 2003, 2004, 2005, 2006, + * 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 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. */ + +#include "config.h" + +#include +#include +#include +#if HAVE_STRING_H +# include +#else /* not HAVE_STRING_H */ +# include +#endif /* not HAVE_STRING_H */ +#include "common.h" +#include "backend.h" +#include "moves.h" +#include "parser.h" + +int WhitePiece P((ChessSquare)); +int BlackPiece P((ChessSquare)); +int SameColor P((ChessSquare, ChessSquare)); +int PosFlags(int index); + +int quickFlag; +char *pieceDesc[EmptySquare]; +char *defaultDesc[EmptySquare] = { + "fmWfceFifmnD", "N", "B", "R", "Q", + "F", "A", "BN", "RN", "W", "K", + "mRcpR", "N0", "BW", "RF", "gQ", + "", "", "QN", "", "N", "", + "", "", "", "", "", + "", "", "", "", "", "", + "", "", "", "", "", + "", "", "", "", "", "K" +}; + +int +WhitePiece (ChessSquare piece) +{ + return (int) piece >= (int) WhitePawn && (int) piece < (int) BlackPawn; +} + +int +BlackPiece (ChessSquare piece) +{ + return (int) piece >= (int) BlackPawn && (int) piece < (int) EmptySquare; +} + +#if 0 +int +SameColor (ChessSquare piece1, ChessSquare piece2) +{ + return ((int) piece1 >= (int) WhitePawn && /* [HGM] can be > King ! */ + (int) piece1 < (int) BlackPawn && + (int) piece2 >= (int) WhitePawn && + (int) piece2 < (int) BlackPawn) + || ((int) piece1 >= (int) BlackPawn && + (int) piece1 < (int) EmptySquare && + (int) piece2 >= (int) BlackPawn && + (int) piece2 < (int) EmptySquare); +} +#else +#define SameColor(piece1, piece2) (piece1 < EmptySquare && piece2 < EmptySquare && (piece1 < BlackPawn) == (piece2 < BlackPawn) || piece1 == DarkSquare || piece2 == DarkSquare) +#endif + +unsigned char pieceToChar[EmptySquare+1] = { + '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' }; +unsigned char pieceNickName[EmptySquare]; +int promoPartner[EmptySquare]; + +char +PieceToChar (ChessSquare p) +{ + int c; + if((int)p < 0 || (int)p >= (int)EmptySquare) return('?'); /* [HGM] for safety */ + c = pieceToChar[(int) p]; + if(c & 128) c = c & 63 | 64; + return c; +} + +char +PieceSuffix (ChessSquare p) +{ + int c; + if((int)p < 0 || (int)p >= (int)EmptySquare) return 0; /* [HGM] for safety */ + c = pieceToChar[(int) p]; + if(c < 128) return 0; + return SUFFIXES[c - 128 >> 6]; +} + +int +PieceToNumber (ChessSquare p) /* [HGM] holdings: count piece type, ignoring non-participating piece types */ +{ + int i=0; + ChessSquare start = (int)p >= (int)BlackPawn ? BlackPawn : WhitePawn; + + while(start++ != p) if(pieceToChar[start-1] != '.' && pieceToChar[start-1] != '+') i++; + return i; +} + +ChessSquare +CharToPiece (int c) +{ + int i; + if(c == '.') return EmptySquare; + for(i=0; i< (int) EmptySquare; i++) + if(pieceNickName[i] == c) return (ChessSquare) i; + for(i=0; i< (int) EmptySquare; i++) + if(pieceToChar[i] == c) return (ChessSquare) i; + return EmptySquare; +} + +void +CopyBoard (Board to, Board from) +{ + int i, j; + + for (i = 0; i < BOARD_HEIGHT; i++) + for (j = 0; j < BOARD_WIDTH; j++) + to[i][j] = from[i][j]; + for (j = 0; j < BOARD_FILES; j++) // [HGM] gamestate: copy castling rights and ep status + to[VIRGIN][j] = from[VIRGIN][j], + to[CASTLING][j] = from[CASTLING][j]; + to[HOLDINGS_SET] = 0; // flag used in ICS play +} + +int +CompareBoards (Board board1, Board board2) +{ + int i, j; + + for (i = 0; i < BOARD_HEIGHT; i++) + for (j = 0; j < BOARD_WIDTH; j++) { + if (board1[i][j] != board2[i][j]) + return FALSE; + } + return TRUE; +} + +char defaultName[] = "PNBRQ......................................K" // white + "pnbrq......................................k"; // black +char shogiName[] = "PNBRLS...G.++++++..........................K" // white + "pnbrls...g.++++++..........................k"; // black +char xqName[] = "PH.R.AE..K.C................................" // white + "ph.r.ae..k.c................................"; // black + +char * +CollectPieceDescriptors () +{ // make a line of piece descriptions for use in the PGN Piece tag: + // dump all engine defined pieces, and pieces with non-standard names, + // but suppress black pieces that are the same as their white counterpart + ChessSquare p; + static char buf[MSG_SIZ], s[2]; + char *m, *pieceName = defaultName; + int len, c, d; + *buf = NULLCHAR; + if(!pieceDefs) return ""; + if(gameInfo.variant == VariantChu) return ""; // for now don't do this for Chu Shogi + if(gameInfo.variant == VariantShogi) pieceName = shogiName; + if(gameInfo.variant == VariantXiangqi) pieceName = xqName; + for(p=WhitePawn; p= BlackPawn && pieceToChar[BLACK_TO_WHITE p] == (c & ~32) + && (c != '+' || pieceToChar[DEMOTED(BLACK_TO_WHITE p)] == d)) {// black member of normal pair + char *wm = pieceDesc[BLACK_TO_WHITE p]; + if(!m && !wm || m && wm && !strcmp(wm, m)) continue; // moves as a white piece + } else // white or unpaired black + if((p < BlackPawn || CharToPiece(d & ~32) != EmptySquare) && // white or lone black + !pieceDesc[p] /*&& pieceName[p] == c*/) continue; // orthodox piece known by its usual name +// TODO: listing pieces because of unusual name can only be done if we have accurate Betza of all defaults + if(!m) m = defaultDesc[p]; + if(!m) continue; + len = strlen(buf); + *s = (d > 128 ? SUFFIXES[d-128>>6] : 0); d = 64 + (d & 63); + snprintf(buf+len, MSG_SIZ-len, "%s%s%c%s:%s", len ? ";" : "", c == '+' ? "+" : "", d, s, m); + } + return buf; +} + +int +LoadPieceDesc (char *s) +{ + ChessSquare piece; + static char suf[] = SUFFIXES; + char *r, *p, *q = s; + int ok = TRUE, promoted, c; + while(q && *s) { + p = s; + q = strchr(s, ';'); + if(q) *q = 0, s = q+1; + if(*p == '+') promoted = 1, p++; else promoted = 0; + c = *p++; + if(!c) { ok = FALSE; continue; } // bad syntax + if(*p && (r = strchr(suf, *p))) c += 64*(r - suf + 1), p++; + if(*p++ != ':') { ok = FALSE; continue; } // bad syntax + if(!strcmp(p, "(null)")) continue; // handle bug in writing of XBoard 4.8.0 + piece = CharToPiece(c); + if(piece >= EmptySquare) { ok = FALSE; continue; } // non-existent piece + if(promoted) { + piece = promoPartner[piece]; + if(pieceToChar[piece] != '+') { ok = FALSE; continue; } // promoted form does not exist + } + ASSIGN(pieceDesc[piece], p); + if(piece < BlackPawn && (pieceToChar[WHITE_TO_BLACK piece] == pieceToChar[piece] + 32 || promoted)) { + ASSIGN(pieceDesc[WHITE_TO_BLACK piece], p); + } + pieceDefs = TRUE; + if(q) *q = ';'; + } + return ok; +} + +// [HGM] gen: configurable move generation from Betza notation sent by engine. +// Some notes about two-leg moves: GenPseudoLegal() works in two modes, depending on whether a 'kill- +// square has been set: without one is generates all moves, and a global int legNr flags in bits 0 and 1 +// if the move has 1 or 2 legs. Only the marking of squares makes use of this info, by only marking +// target squares of leg 1 (rejecting null move). A dummy move with MoveType 'FirstLeg' to the relay square +// is generated, so a cyan marker can be put there, and other functions can ignore such a move. When the +// user selects this square, it becomes the kill-square. Once a kill-square is set, only 2-leg moves are +// generated that use that square as relay, plus 1-leg moves, so the 1-leg move that goes to the kill-square +// can be marked during 2nd-leg entry to terminate the move there. For judging the pseudo-legality of the +// 2nd leg, the from-square has to be considered empty, although the moving piece is still on it. + +Boolean pieceDefs; + +// alphabet "abcdefghijklmnopqrstuvwxyz" +char symmetry[] = "FBNW.FFW.NKN.NW.QR....W..N"; +char xStep[] = "2110.130.102.10.00....0..2"; +char yStep[] = "2132.133.313.20.11....1..3"; +char dirType[] = "01000104000200000260050000"; +char upgrade[] = "AFCD.BGH.JQL.NO.KW....R..Z"; +char rotate[] = "DRCA.WHG.JKL.NO.QB....F..Z"; + +// alphabet "a b c d e f g h i j k l m n o p q r s t u v w x y z " +int dirs1[] = { 0,0x3C,0,0,0,0xC3,0,0, 0,0,0,0xF0,0,0,0,0,0,0x0F,0 ,0,0,0 ,0,0,0,0 }; +int dirs2[] = { 0,0x18,0,0,0,0x81,0,0xFF,0,0,0,0x60,0,0,0,0,0,0x06,0x66,0,0,0x99,0,0,0,0 }; +int dirs3[] = { 0,0x38,0,0,0,0x83,0,0xFF,0,0,0,0xE0,0,0,0,0,0,0x0E,0xEE,0,0,0xBB,0,0,0,0 }; +int dirs4[] = { 0,0x10,0,0,0,0x01,0,0xFF,0,0,0,0x40,0,0,0,0,0,0x04,0x44,0,0,0x11,0,0,0,0 }; + +int rot[][4] = { // rotation matrices for each direction + { 1, 0, 0, 1 }, + { 0, 1, 1, 0 }, + { 0, 1,-1, 0 }, + { 1, 0, 0,-1 }, + {-1, 0, 0,-1 }, + { 0,-1,-1, 0 }, + { 0,-1, 1, 0 }, + {-1, 0, 0, 1 } +}; + +void +OK (Board board, int flags, ChessMove kind, int rf, int ff, int rt, int ft, VOIDSTAR cl) +{ + (*(int*)cl)++; +} + +void +MovesFromString (Board board, int flags, int f, int r, int tx, int ty, int angle, int range, char *desc, MoveCallback cb, VOIDSTAR cl) +{ + char buf[80], *p = desc, *atom = NULL; + int mine, his, dir, bit, occup, i, ep, promoRank = -1; + ChessMove promo= NormalMove; ChessSquare pc = board[r][f]; + if(pc == DarkSquare) return; // this is not a piece, but a 'hole' in the board + if(flags & F_WHITE_ON_MOVE) his = 2, mine = 1; else his = 1, mine = 2; + if(pc == WhitePawn || pc == WhiteLance) promo = WhitePromotion, promoRank = BOARD_HEIGHT-1; else + if(pc == BlackPawn || pc == BlackLance) promo = BlackPromotion, promoRank = 0; + while(*p) { // more moves to go + int expo = -1, dx, dy, x, y, mode, dirSet, ds2=0, retry=0, initial=0, jump=1, skip = 0, all = 0; + char *cont = NULL; + while(*p == 'i') initial++, desc = ++p; + while(islower(*p)) p++; // skip prefixes + if(!isupper(*p)) return; // syntax error: no atom + dx = xStep[*p-'A'] - '0';// step vector of atom + dy = yStep[*p-'A'] - '0'; + dirSet = 0; // build direction set based on atom symmetry + switch(symmetry[*p-'A']) { + case 'B': expo = 0; // bishop, slide + case 'F': all = 0xAA; // diagonal atom (degenerate 4-fold) + if(tx >= 0) goto king; // continuation legs specified in K/Q system! + while(islower(*desc) && (i = dirType[*desc-'a']) != '0') { + int b = dirs1[*desc-'a']; // use wide version + if( islower(desc[1]) && + ((i | dirType[desc[1]-'a']) & 3) == 3) { // combinable (perpendicular dim) + b = dirs1[*desc-'a'] & dirs1[desc[1]-'a']; // intersect wide & perp wide + desc += 2; + } else desc++; + dirSet |= b; + } + dirSet &= 0xAA; if(!dirSet) dirSet = 0xAA; + break; + case 'R': expo = 0; // rook, slide + case 'W': all = 0x55; // orthogonal atom (non-deg 4-fold) + if(tx >= 0) goto king; // continuation legs specified in K/Q system! + while(islower(*desc) && (dirType[*desc-'a'] & ~4) != '0') dirSet |= dirs2[*desc++-'a']; + dirSet &= 0x55; if(!dirSet) dirSet = 0x55; + dirSet = (dirSet << angle | dirSet >> 8-angle) & 255; // re-orient direction system + break; + case 'N': all = 0xFF; // oblique atom (degenerate 8-fold) + if(tx >= 0) goto king; // continuation legs specified in K/Q system! + if(*desc == 'h') { // chiral direction sets 'hr' and 'hl' + dirSet = (desc[1] == 'r' ? 0x55 : 0xAA); desc += 2; + } else + while(islower(*desc) && (i = dirType[*desc-'a']) != '0') { + int b = dirs2[*desc-'a']; // when alone, use narrow version + if(desc[1] == 'h') b = dirs1[*desc-'a'], desc += 2; // dirs1 is wide version + else if(*desc == desc[1] || islower(desc[1]) && i < '4' + && ((i | dirType[desc[1]-'a']) & 3) == 3) { // combinable (perpendicular dim or same) + b = dirs1[*desc-'a'] & dirs2[desc[1]-'a']; // intersect wide & perp narrow + desc += 2; + } else desc++; + dirSet |= b; + } + if(!dirSet) dirSet = 0xFF; + break; + case 'Q': expo = 0; // queen, slide + case 'K': all = 0xFF; // non-deg (pseudo) 8-fold + king: + while(islower(*desc) && (i = dirType[*desc-'a']) != '0') { + int b = dirs4[*desc-'a']; // when alone, use narrow version + if(desc[1] == *desc) desc++; // doubling forces alone + else if(islower(desc[1]) && i < '4' + && ((i | dirType[desc[1]-'a']) & 3) == 3) { // combinable (perpendicular dim or same) + b = dirs3[*desc-'a'] & dirs3[desc[1]-'a']; // intersect wide & perp wide + desc += 2; + } else desc++; + dirSet |= b; + } + if(!dirSet) dirSet = (tx < 0 ? 0xFF // default is all directions, but in continuation leg + : all == 0xFF ? 0xEF : 0x45); // omits backward, and for 4-fold atoms also diags + dirSet = (dirSet << angle | dirSet >> 8-angle) & 255; // re-orient direction system + ds2 = dirSet & 0xAA; // extract diagonal directions + if(dirSet &= 0x55) // start with orthogonal moves, if present + retry = 1, dx = 0; // and schedule the diagonal moves for later + else dx = dy, dirSet = ds2; // if no orthogonal directions, do diagonal immediately + break; // should not have direction indicators + default: return; // syntax error: invalid atom + } + if(mine == 2 && tx < 0) dirSet = dirSet >> 4 | dirSet << 4 & 255; // invert black moves + mode = 0; // build mode mask + if(*desc == 'm') mode |= 4, desc++; // move to empty + if(*desc == 'c') mode |= his, desc++; // capture foe + if(*desc == 'd') mode |= mine, desc++; // destroy (capture friend) + if(*desc == 'e') mode |= 8, desc++; // e.p. capture last mover + if(*desc == 't') mode |= 16, desc++; // exclude enemies as hop platform ('test') + if(*desc == 'p') mode |= 32, desc++; // hop over occupied + if(*desc == 'g') mode |= 64, desc++; // hop and toggle range + if(*desc == 'o') mode |= 128, desc++; // wrap around cylinder board + if(*desc == 'y') mode |= 512, desc++; // toggle range on empty square + if(*desc == 'n') jump = 0, desc++; // non-jumping + while(*desc == 'j') jump++, desc++; // must jump (on B,R,Q: skip first square) + if(*desc == 'a') cont = ++desc; // move again after doing what preceded it + if(isdigit(*++p)) expo = atoi(p++); // read exponent + if(expo > 9) p++; // allow double-digit + desc = p; // this is start of next move + if(initial == 2) { if(board[r][f] != initialPosition[r-2*his+3][f]) continue; initial = 0; } else + if(initial && !range) { + if( (board[r][f] != initialPosition[r][f] || + r == 0 && board[TOUCHED_W] & 1< 0 && dx == 0 && dy == 0) { // castling indicated by O + number + mode |= 1024; dy = 1; + } + if(expo < 0) expo = 1; // use 1 for default + if(!cont) { + if(!(mode & 15)) mode |= his + 4; // no mode spec, use default = mc + } else { + strncpy(buf, cont, 80); cont = buf; // copy next leg(s), so we can modify + atom = buf; while(islower(*atom)) atom++; // skip to atom + if(mode & 32) mode ^= 256 + 32; // in non-final legs 'p' means 'pass through' + if(mode & 64 + 512) { + mode |= 256; // and 'g' too, but converts leaper <-> slider + if(mode & 512) mode ^= 0x304; // and 'y' is m-like 'g' + *atom = upgrade[*atom-'A']; // replace atom, BRQ <-> FWK + atom[1] = atom[2] = '\0'; // make sure any old range is stripped off + if(expo == 1) atom[1] = '0'; // turn other leapers into riders + } + if(!(mode & 0x30F)) mode |= 4; // and default of this leg = m + } + if(dy == 1) skip = jump - 1, jump = 1; // on W & F atoms 'j' = skip first square + do { + for(dir=0, bit=1; dir<8; dir++, bit += bit) { // loop over directions + int i = expo, j = skip, hop = mode, vx, vy, loop = 0; + if(!(bit & dirSet)) continue; // does not move in this direction + if(dy != 1 || mode & 1024) j = 0; // + vx = dx*rot[dir][0] + dy*rot[dir][1]; // rotate step vector + vy = dx*rot[dir][2] + dy*rot[dir][3]; + if(tx < 0) x = f, y = r; // start square + else x = tx, y = ty; // from previous to-square if continuation + do { // traverse ray + x += vx; y += vy; // step to next square + if(y < 0 || y >= BOARD_HEIGHT) break; // vertically off-board: always done + if(x < BOARD_LEFT) { if(mode & 128) x += BOARD_RGHT - BOARD_LEFT, loop++; else break; } + if(x >= BOARD_RGHT) { if(mode & 128) x -= BOARD_RGHT - BOARD_LEFT, loop++; else break; } + if(j) { j--; continue; } // skip irrespective of occupation + if(board[y][x] == DarkSquare) break; // black squares are supposed to be off board + if(!jump && board[y - vy + vy/2][x - vx + vx/2] != EmptySquare) break; // blocked + if(jump > 1 && board[y - vy + vy/2][x - vx + vx/2] == EmptySquare) break; // no hop + if(x == f && y == r && !loop) occup = 4; else // start square counts as empty (if not around cylinder!) + if(board[y][x] < BlackPawn) occup = 0x101; else + if(board[y][x] < EmptySquare) occup = 0x102; else + occup = 4; + if(initial && expo - i + 1 != range) { if(occup == 4) continue; else break; } + if(cont) { // non-final leg + if(mode&16 && his&occup) occup &= 3;// suppress hopping foe in t-mode + if(occup & mode) { // valid intermediate square, do continuation + char origAtom = *atom; + int rg = (expo != 1 ? expo - i + 1 : range); // pass length of last *slider* leg + if(!(bit & all)) *atom = rotate[*atom - 'A']; // orth-diag interconversion to make direction valid + if(occup & mode & 0x104) // no side effects, merge legs to one move + MovesFromString(board, flags, f, r, x, y, dir, rg, cont, cb, cl); + if(occup & mode & 3 && (killX < 0 || kill2X < 0 && (legNr > 1 || killX == x && killY == y) || + (legNr == 1 ? kill2X == x && kill2Y == y : killX == x && killY == y))) { // destructive first leg + int cnt = 0; + legNr <<= 1; + MovesFromString(board, flags, f, r, x, y, dir, rg, cont, &OK, &cnt); // count possible continuations + legNr >>= 1; + if(cnt) { // and if there are + if(legNr & 1 ? killX < 0 : kill2X < 0) cb(board, flags, FirstLeg, r, f, y, x, cl); // then generate their first leg + legNr <<= 1; + MovesFromString(board, flags, f, r, x, y, dir, rg, cont, cb, cl); + legNr >>= 1; + } + } + *atom = origAtom; // undo any interconversion + } + if(occup != 4) break; // occupied squares always terminate the leg + continue; + } + if(hop & 32+64) { if(occup != 4) { if(hop & 64 && i != 1) i = 2; hop &= 31; } continue; } // hopper + ep = board[EP_RANK]; + if(mode & 8 && occup == 4 && board[EP_FILE] == x && (y == (ep & 127) || y - vy == ep - 128)) { // to e.p. square (or 2nd e.p. square) + cb(board, flags, mine == 1 ? WhiteCapturesEnPassant : BlackCapturesEnPassant, r, f, y, x, cl); + } + if(mode & 1024) { // castling + i = 2; // kludge to elongate move indefinitely + if(occup == 4) continue; // skip empty squares + if((x == BOARD_LEFT + skip || x > BOARD_LEFT + skip && vx < 0 && board[y][x-1-skip] == DarkSquare) + && board[y][x] == initialPosition[y][x]) { // reached initial corner piece + if(pc != WhiteKing && pc != BlackKing || expo == 1) { // non-royal castling (to be entered as two-leg move via 'Rook') + if(killX < 0) cb(board, flags, FirstLeg, r, f, y, x, cl); if(killX < f) + legNr <<= 1, cb(board, flags, NormalMove, r, f, y, f - expo, cl), legNr >>= 1; + } else + cb(board, flags, mine == 1 ? WhiteQueenSideCastle : BlackQueenSideCastle, r, f, y, f - expo, cl); + } + if((x == BOARD_RGHT-1-skip || x < BOARD_RGHT-1-skip && vx > 0 && board[y][x+1+skip] == DarkSquare) + && board[y][x] == initialPosition[y][x]) { + if(pc != WhiteKing && pc != BlackKing || expo == 1) { + if(killX < 0) cb(board, flags, FirstLeg, r, f, y, x, cl); if(killX > f) + legNr <<= 1, cb(board, flags, NormalMove, r, f, y, f + expo, cl), legNr >>= 1; + } else + cb(board, flags, mine == 1 ? WhiteKingSideCastle : BlackKingSideCastle, r, f, y, f + expo, cl); + } + break; + } + if(mode & 16 && (board[y][x] == WhiteKing || board[y][x] == BlackKing)) break; // tame piece, cannot capture royal + if(occup & mode) cb(board, flags, y == promoRank ? promo : NormalMove, r, f, y, x, cl); // allowed, generate + if(occup != 4) break; // not valid transit square + } while(--i); + } + dx = dy; dirSet = ds2; // prepare for diagonal moves of K,Q + } while(retry-- && ds2); // and start doing them + if(tx >= 0) break; // don't do other atoms in continuation legs + } +} // next atom + +// [HGM] move generation now based on hierarchy of subroutines for rays and combinations of rays + +void +SlideForward (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + int i, rt, ft = ff; + for (i = 1;; i++) { + rt = rf + i; + 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; + } +} + +void +SlideBackward (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + int i, rt, ft = ff; + for (i = 1;; i++) { + rt = rf - i; + 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; + } +} + +void +SlideVertical (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + SlideForward(board, flags, rf, ff, callback, closure); + SlideBackward(board, flags, rf, ff, callback, closure); +} + +void +SlideSideways (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + int i, s, rt = rf, ft; + for(s = -1; s <= 1; s+= 2) { + for (i = 1;; i++) { + ft = ff + i*s; + if (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; + } + } +} + +void +SlideDiagForward (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + int i, s, rt, ft; + for(s = -1; s <= 1; s+= 2) { + for (i = 1;; i++) { + rt = rf + i; + ft = ff + i * s; + if (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; + } + } +} + +void +SlideDiagBackward (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + int i, s, rt, ft; + for(s = -1; s <= 1; s+= 2) { + for (i = 1;; i++) { + rt = rf - i; + ft = ff + i * s; + if (rt < 0 || 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; + } + } +} + +void +Rook (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + SlideVertical(board, flags, rf, ff, callback, closure); + SlideSideways(board, flags, rf, ff, callback, closure); +} + +void +Bishop (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + SlideDiagForward(board, flags, rf, ff, callback, closure); + SlideDiagBackward(board, flags, rf, ff, callback, closure); +} + +void +Sting (Board board, int flags, int rf, int ff, int dy, int dx, MoveCallback callback, VOIDSTAR closure) +{ // Lion-like move of Horned Falcon and Soaring Eagle + int ft = ff + dx, rt = rf + dy; + if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) return; + legNr += 2; + if (!SameColor(board[rf][ff], board[rt][ft])) + callback(board, flags, killX < 0 && board[rt][ft] != EmptySquare ? FirstLeg : NormalMove, rf, ff, rt, ft, closure); + legNr -= 2; + ft += dx; rt += dy; + if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) return; + legNr += 2; + if (!SameColor(board[rf][ff], board[rt][ft])) + callback(board, flags, NormalMove, rf, ff, rt, ft, closure); + if (!SameColor(board[rf][ff], board[rf+dy][ff+dx])) + callback(board, flags, NormalMove, rf, ff, rf, ff, closure); + legNr -= 2; +} + +void +StepForward (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + int ft = ff, rt = rf + 1; + if (rt >= BOARD_HEIGHT) return; + if (SameColor(board[rf][ff], board[rt][ft])) return; + callback(board, flags, NormalMove, rf, ff, rt, ft, closure); +} + +void +StepBackward (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + int ft = ff, rt = rf - 1; + if (rt < 0) return; + if (SameColor(board[rf][ff], board[rt][ft])) return; + callback(board, flags, NormalMove, rf, ff, rt, ft, closure); +} + +void +StepSideways (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + int ft, rt = rf; + ft = ff + 1; + if (!(rt >= BOARD_HEIGHT || ft >= BOARD_RGHT) && !SameColor(board[rf][ff], board[rt][ft])) + callback(board, flags, NormalMove, rf, ff, rt, ft, closure); + ft = ff - 1; + if (!(rt >= BOARD_HEIGHT || ft < BOARD_LEFT) && !SameColor(board[rf][ff], board[rt][ft])) + callback(board, flags, NormalMove, rf, ff, rt, ft, closure); +} + +void +StepDiagForward (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + int ft, rt = rf + 1; + if (rt >= BOARD_HEIGHT) return; + ft = ff + 1; + if (!(rt >= BOARD_HEIGHT || ft >= BOARD_RGHT) && !SameColor(board[rf][ff], board[rt][ft])) + callback(board, flags, NormalMove, rf, ff, rt, ft, closure); + ft = ff - 1; + if (!(rt >= BOARD_HEIGHT || ft < BOARD_LEFT) && !SameColor(board[rf][ff], board[rt][ft])) + callback(board, flags, NormalMove, rf, ff, rt, ft, closure); +} + +void +StepDiagBackward (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + int ft, rt = rf - 1; + if(rt < 0) return; + ft = ff + 1; + if (!(rt < 0 || ft >= BOARD_RGHT) && !SameColor(board[rf][ff], board[rt][ft])) + callback(board, flags, NormalMove, rf, ff, rt, ft, closure); + ft = ff - 1; + if (!(rt < 0 || ft < BOARD_LEFT) && !SameColor(board[rf][ff], board[rt][ft])) + callback(board, flags, NormalMove, rf, ff, rt, ft, closure); +} + +void +StepVertical (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + StepForward(board, flags, rf, ff, callback, closure); + StepBackward(board, flags, rf, ff, callback, closure); +} + +void +Ferz (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + StepDiagForward(board, flags, rf, ff, callback, closure); + StepDiagBackward(board, flags, rf, ff, callback, closure); +} + +void +Wazir (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + StepVertical(board, flags, rf, ff, callback, closure); + StepSideways(board, flags, rf, ff, callback, closure); +} + +void +Knight (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure) +{ + int i, j, s, rt, ft; + 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 >= 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); + } +} + +/* Call callback once for each pseudo-legal move in the given + position, except castling moves. A move is pseudo-legal if it is + legal, or if it would be legal except that it leaves the king in + check. In the arguments, epfile is EP_NONE if the previous move + was not a double pawn push, or the file 0..7 if it was, or + EP_UNKNOWN if we don't know and want to allow all e.p. captures. + Promotion moves generated are to Queen only. +*/ +void +GenPseudoLegal (Board board, int flags, MoveCallback callback, VOIDSTAR closure, ChessSquare filter) +// speed: only do moves with this piece type +{ + int rf, ff; + int i, j, d, s, fs, rs, rt, ft, m; + int epfile = (signed char)board[EP_STATUS]; // [HGM] gamestate: extract ep status from board + int promoRank = gameInfo.variant == VariantMakruk || gameInfo.variant == VariantGrand || gameInfo.variant == VariantChuChess ? 3 : 1; + + for (rf = 0; rf < BOARD_HEIGHT; rf++) + for (ff = BOARD_LEFT; ff < BOARD_RGHT; ff++) { + ChessSquare piece; + + if(board[rf][ff] == EmptySquare) continue; + if ((flags & F_WHITE_ON_MOVE) != (board[rf][ff] < BlackPawn)) continue; // [HGM] speed: wrong color + m = 0; piece = board[rf][ff]; + if(PieceToChar(piece) == '~') + piece = (ChessSquare) ( DEMOTED(piece) ); + if(filter != EmptySquare && piece != filter) continue; + if(pieceDefs && pieceDesc[piece]) { // [HGM] gen: use engine-defined moves + MovesFromString(board, flags, ff, rf, -1, -1, 0, 0, pieceDesc[piece], callback, closure); + continue; + } + if(IS_SHOGI(gameInfo.variant)) + piece = (ChessSquare) ( SHOGI piece ); + + switch ((int)piece) { + /* case EmptySquare: [HGM] this is nonsense, and conflicts with Shogi cases */ + default: + /* can't happen ([HGM] except for faries...) */ + break; + + 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 >= BOARD_HEIGHT-1-promoRank ? WhitePromotion : NormalMove, + rf, ff, rf + 1, ff, closure); + } + if (rf <= (BOARD_HEIGHT>>1)-3 && board[rf+1][ff] == EmptySquare && // [HGM] grand: also on 3rd rank on 10-board + gameInfo.variant != VariantShatranj && /* [HGM] */ + gameInfo.variant != VariantCourier && /* [HGM] */ + board[rf+2][ff] == EmptySquare ) { + callback(board, flags, NormalMove, + rf, ff, rf+2, ff, closure); + } + for (s = -1; s <= 1; s += 2) { + 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 >= BOARD_HEIGHT-1-promoRank ? WhitePromotion : NormalMove, + rf, ff, rf + 1, ff + s, closure); + } + if (rf >= BOARD_HEIGHT+1>>1) {// [HGM] grand: 4th & 5th rank on 10-board + if (ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT && + (epfile == ff + s || epfile == EP_UNKNOWN) && rf < BOARD_HEIGHT-3 && + board[rf][ff + s] == BlackPawn && + board[rf+1][ff + s] == EmptySquare) { + callback(board, flags, WhiteCapturesEnPassant, + rf, ff, rf+1, 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 <= promoRank ? BlackPromotion : NormalMove, + rf, ff, rf - 1, ff, closure); + } + if (rf >= (BOARD_HEIGHT+1>>1)+2 && board[rf-1][ff] == EmptySquare && // [HGM] grand + gameInfo.variant != VariantShatranj && /* [HGM] */ + gameInfo.variant != VariantCourier && /* [HGM] */ + board[rf-2][ff] == EmptySquare) { + callback(board, flags, NormalMove, + rf, ff, rf-2, ff, closure); + } + for (s = -1; s <= 1; s += 2) { + 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 <= promoRank ? BlackPromotion : NormalMove, + rf, ff, rf - 1, ff + s, closure); + } + if (rf < BOARD_HEIGHT>>1) { + if (ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT && + (epfile == ff + s || epfile == EP_UNKNOWN) && rf > 2 && + board[rf][ff + s] == WhitePawn && + board[rf-1][ff + s] == EmptySquare) { + callback(board, flags, BlackCapturesEnPassant, + rf, ff, rf-1, ff + s, closure); + } + } + } + break; + + case WhiteUnicorn: + case BlackUnicorn: + case WhiteKnight: + case BlackKnight: + 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 >= 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 (PROMO WhitePawn): + if(gameInfo.variant == VariantShogi) goto WhiteGold; + case SHOGI (PROMO BlackPawn): + if(gameInfo.variant == VariantShogi) goto BlackGold; + case SHOGI WhiteAxe: + case SHOGI BlackAxe: + SlideVertical(board, flags, rf, ff, callback, closure); + break; + + case SHOGI (PROMO WhiteKnight): + if(gameInfo.variant == VariantShogi) goto WhiteGold; + case SHOGI WhiteClaw: + case SHOGI BlackDrunk: + case SHOGI BlackAlfil: + Ferz(board, flags, rf, ff, callback, closure); + StepSideways(board, flags, rf, ff, callback, closure); + StepBackward(board, flags, rf, ff, callback, closure); + break; + + case SHOGI (PROMO BlackKnight): + if(gameInfo.variant == VariantShogi) goto BlackGold; + case SHOGI BlackClaw: + case SHOGI WhiteDrunk: + case SHOGI WhiteAlfil: + Ferz(board, flags, rf, ff, callback, closure); + StepSideways(board, flags, rf, ff, callback, closure); + StepForward(board, flags, rf, ff, callback, closure); + break; + + + case SHOGI WhiteGnu: + case SHOGI BlackGnu: + if(gameInfo.variant == VariantShogi) goto BlackGold; + SlideVertical(board, flags, rf, ff, callback, closure); + Ferz(board, flags, rf, ff, callback, closure); + StepSideways(board, flags, rf, ff, callback, closure); + break; + + case SHOGI (PROMO WhiteQueen): + case SHOGI WhiteTokin: + case SHOGI WhiteWazir: + WhiteGold: + StepDiagForward(board, flags, rf, ff, callback, closure); + Wazir(board, flags, rf, ff, callback, closure); + break; + + case SHOGI (PROMO BlackQueen): + case SHOGI BlackTokin: + case SHOGI BlackWazir: + BlackGold: + StepDiagBackward(board, flags, rf, ff, callback, closure); + Wazir(board, flags, rf, ff, callback, closure); + break; + + case WhiteWazir: + case BlackWazir: + Wazir(board, flags, rf, ff, callback, closure); + break; + + case SHOGI WhiteMarshall: + case SHOGI BlackMarshall: + Ferz(board, flags, rf, ff, callback, closure); + for (d = 0; d <= 1; d++) + for (s = -2; s <= 2; s += 4) { + rt = rf + s * d; + ft = ff + s * (1 - d); + if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) continue; + if (!SameColor(board[rf][ff], board[rt][ft]) ) + callback(board, flags, NormalMove, rf, ff, rt, ft, closure); + } + break; + + case SHOGI WhiteAngel: + case SHOGI BlackAngel: + Wazir(board, flags, rf, ff, callback, closure); + + 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); + if(gameInfo.variant == VariantShatranj || gameInfo.variant == VariantCourier || + gameInfo.variant == VariantChu || gameInfo.variant == VariantXiangqi) continue; // classical Alfil + rt = rf + rs; // in unknown variant we assume Modern Elephant, which can also do one step + ft = ff + fs; + if (!(rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) + && !SameColor(board[rf][ff], board[rt][ft])) + callback(board, flags, NormalMove, + rf, ff, rt, ft, closure); + } + if(gameInfo.variant == VariantSpartan) + for(fs = -1; fs <= 1; fs += 2) { + ft = ff + fs; + if (!(ft < BOARD_LEFT || ft >= BOARD_RGHT) && board[rf][ft] == EmptySquare) + callback(board, flags, NormalMove, rf, ff, rf, ft, closure); + } + break; + + /* Make Dragon-Horse also do Dababba moves outside Shogi, for better disambiguation in variant Fairy */ + case WhiteCardinal: + case BlackCardinal: + if(gameInfo.variant == VariantChuChess) goto DragonHorse; + for (d = 0; d <= 1; d++) // Dababba moves that Rook cannot do + for (s = -2; s <= 2; s += 4) { + rt = rf + s * d; + ft = ff + s * (1 - d); + 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); + } + + /* Shogi Dragon Horse has to continue with Wazir after Bishop */ + case SHOGI WhiteCardinal: + case SHOGI BlackCardinal: + case SHOGI WhitePCardinal: + case SHOGI BlackPCardinal: + DragonHorse: + Bishop(board, flags, rf, ff, callback, closure); + Wazir(board, flags, rf, ff, callback, closure); + break; + + /* Capablanca Archbishop continues as Knight */ + case WhiteAngel: + case BlackAngel: + Knight(board, flags, rf, ff, callback, closure); + + /* Shogi Bishops are ordinary Bishops */ + case SHOGI WhiteBishop: + case SHOGI BlackBishop: + case SHOGI WhitePBishop: + case SHOGI BlackPBishop: + case WhiteBishop: + case BlackBishop: + Bishop(board, flags, rf, ff, callback, closure); + break; + + /* Shogi Lance is unlike anything, and asymmetric at that */ + case SHOGI WhiteQueen: + if(gameInfo.variant == VariantChu) goto doQueen; + 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: + if(gameInfo.variant == VariantChu) goto doQueen; + 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; + + /* Make Dragon-King Dababba & Rook-like outside Shogi, for better disambiguation in variant Fairy */ + case WhiteDragon: + case BlackDragon: + if(gameInfo.variant == VariantChuChess) goto DragonKing; + for (d = 0; d <= 1; d++) // Dababba moves that Rook cannot do + for (s = -2; s <= 2; s += 4) { + rt = rf + s * d; + ft = ff + s * (1 - d); + if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) continue; + if (board[rf+rt>>1][ff+ft>>1] == EmptySquare && gameInfo.variant != VariantSpartan) continue; + if (SameColor(board[rf][ff], board[rt][ft])) continue; + callback(board, flags, NormalMove, rf, ff, rt, ft, closure); + } + if(gameInfo.variant == VariantSpartan) // in Spartan Chess restrict range to modern Dababba + Wazir(board, flags, rf, ff, callback, closure); + else + Rook(board, flags, rf, ff, callback, closure); + break; + + /* Shogi Dragon King has to continue as Ferz after Rook moves */ + case SHOGI WhiteDragon: + case SHOGI BlackDragon: + case SHOGI WhitePDragon: + case SHOGI BlackPDragon: + DragonKing: + Rook(board, flags, rf, ff, callback, closure); + Ferz(board, flags, rf, ff, callback, closure); + break; + m++; + + /* Capablanca Chancellor sets flag to continue as Knight */ + case WhiteMarshall: + case BlackMarshall: + Rook(board, flags, rf, ff, callback, closure); + if(gameInfo.variant == VariantSpartan) // in Spartan Chess Chancellor is used for Dragon King. + Ferz(board, flags, rf, ff, callback, closure); + else + Knight(board, flags, rf, ff, callback, closure); + break; + + /* Shogi Rooks are ordinary Rooks */ + case SHOGI WhiteRook: + case SHOGI BlackRook: + case SHOGI WhitePRook: + case SHOGI BlackPRook: + case WhiteRook: + case BlackRook: + Rook(board, flags, rf, ff, callback, closure); + break; + + case WhiteQueen: + case BlackQueen: + case SHOGI WhiteMother: + case SHOGI BlackMother: + doQueen: + Rook(board, flags, rf, ff, callback, closure); + Bishop(board, flags, rf, ff, callback, closure); + break; + + case SHOGI WhitePawn: + StepForward(board, flags, rf, ff, callback, closure); + break; + + case SHOGI BlackPawn: + StepBackward(board, flags, rf, ff, callback, closure); + break; + + case WhiteMan: + if(gameInfo.variant != VariantMakruk && gameInfo.variant != VariantASEAN) goto commoner; + case SHOGI WhiteFerz: + Ferz(board, flags, rf, ff, callback, closure); + StepForward(board, flags, rf, ff, callback, closure); + break; + + case BlackMan: + if(gameInfo.variant != VariantMakruk && gameInfo.variant != VariantASEAN) goto commoner; + case SHOGI BlackFerz: + StepBackward(board, flags, rf, ff, callback, closure); + + case WhiteFerz: + case BlackFerz: + if(gameInfo.variant == VariantXiangqi && ff != BOARD_WIDTH>>1) { + int rt = (piece == BlackFerz ? BOARD_HEIGHT-2 : 1); + int ft = BOARD_WIDTH>>1; + if(!SameColor(board[rf][ff], board[rt][ft])) + callback(board, flags, NormalMove, rf, ff, rt, ft, closure); + } else + /* [HGM] support Shatranj pieces */ + Ferz(board, flags, rf, ff, callback, closure); + break; + + case WhiteSilver: + case BlackSilver: + Knight(board, flags, rf, ff, callback, closure); // [HGM] superchess: use for Centaur + + commoner: + case SHOGI WhiteMonarch: + case SHOGI BlackMonarch: + case SHOGI WhiteKing: + case SHOGI BlackKing: + case WhiteKing: + case BlackKing: + Ferz(board, flags, rf, ff, callback, closure); + Wazir(board, flags, rf, ff, callback, closure); + 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; + + Amazon: + Bishop(board, flags, rf, ff, callback, closure); + Rook(board, flags, rf, ff, callback, closure); + Knight(board, flags, rf, ff, callback, closure); + break; + + // Use Lance as Berolina / Spartan Pawn. + case WhiteLance: + if(gameInfo.variant == VariantSuper) goto Amazon; + if (rf < BOARD_HEIGHT-1 && BlackPiece(board[rf + 1][ff])) + callback(board, flags, + rf >= BOARD_HEIGHT-1-promoRank ? WhitePromotion : NormalMove, + rf, ff, rf + 1, ff, closure); + for (s = -1; s <= 1; s += 2) { + if (rf < BOARD_HEIGHT-1 && ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT && board[rf + 1][ff + s] == EmptySquare) + callback(board, flags, + rf >= BOARD_HEIGHT-1-promoRank ? WhitePromotion : NormalMove, + rf, ff, rf + 1, ff + s, closure); + if (rf == 1 && ff + 2*s >= BOARD_LEFT && ff + 2*s < BOARD_RGHT && board[3][ff + 2*s] == EmptySquare ) + callback(board, flags, NormalMove, rf, ff, 3, ff + 2*s, closure); + } + break; + + case BlackLance: + if(gameInfo.variant == VariantSuper) goto Amazon; + if (rf > 0 && WhitePiece(board[rf - 1][ff])) + callback(board, flags, + rf <= promoRank ? BlackPromotion : NormalMove, + rf, ff, rf - 1, ff, closure); + for (s = -1; s <= 1; s += 2) { + if (rf > 0 && ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT && board[rf - 1][ff + s] == EmptySquare) + callback(board, flags, + rf <= promoRank ? BlackPromotion : NormalMove, + rf, ff, rf - 1, ff + s, closure); + if (rf == BOARD_HEIGHT-2 && ff + 2*s >= BOARD_LEFT && ff + 2*s < BOARD_RGHT && board[rf-2][ff + 2*s] == EmptySquare ) + callback(board, flags, NormalMove, rf, ff, rf-2, ff + 2*s, closure); + } + break; + + case SHOGI WhiteNothing: + case SHOGI BlackNothing: + case SHOGI WhiteLion: + case SHOGI BlackLion: + case WhiteLion: + case BlackLion: + for(rt = rf - 2; rt <= rf + 2; rt++) for(ft = ff - 2; ft <= ff + 2; ft++) { + if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) continue; + if (!(ff == ft && rf == rt) && SameColor(board[rf][ff], board[rt][ft])) continue; + i = (killX >= 0 && (rt-killY)*(rt-killY) + (killX-ft)*(killX-ft) < 3); legNr += 2*i; + callback(board, flags, (rt-rf)*(rt-rf) + (ff-ft)*(ff-ft) < 3 && board[rt][ft] != EmptySquare && !i ? FirstLeg : NormalMove, + rf, ff, rt, ft, closure); + legNr -= 2*i; + } + break; + + case SHOGI WhiteDagger: + case SHOGI BlackDagger: + case SHOGI WhitePDagger: + case SHOGI BlackPDagger: + SlideSideways(board, flags, rf, ff, callback, closure); + StepVertical(board, flags, rf, ff, callback, closure); + break; + + case SHOGI WhiteCobra: + case SHOGI BlackCobra: + StepVertical(board, flags, rf, ff, callback, closure); + break; + + case SHOGI (PROMO WhiteFerz): + if(gameInfo.variant == VariantShogi) goto WhiteGold; + case SHOGI (PROMO BlackFerz): + if(gameInfo.variant == VariantShogi) goto BlackGold; + case SHOGI WhiteSword: + case SHOGI BlackSword: + case SHOGI WhitePSword: + case SHOGI BlackPSword: + SlideVertical(board, flags, rf, ff, callback, closure); + StepSideways(board, flags, rf, ff, callback, closure); + break; + + case SHOGI WhiteCat: + case SHOGI BlackCat: + Ferz(board, flags, rf, ff, callback, closure); + StepVertical(board, flags, rf, ff, callback, closure); + break; + + case SHOGI WhiteCopper: + StepDiagForward(board, flags, rf, ff, callback, closure); + StepVertical(board, flags, rf, ff, callback, closure); + break; + + case SHOGI BlackCopper: + StepDiagBackward(board, flags, rf, ff, callback, closure); + StepVertical(board, flags, rf, ff, callback, closure); + break; + + case SHOGI WhiteHCrown: + case SHOGI BlackHCrown: + Bishop(board, flags, rf, ff, callback, closure); + SlideSideways(board, flags, rf, ff, callback, closure); + break; + + case SHOGI WhiteCrown: + case SHOGI BlackCrown: + Bishop(board, flags, rf, ff, callback, closure); + SlideVertical(board, flags, rf, ff, callback, closure); + break; + + case SHOGI WhiteUnicorn: + Sting(board, flags, rf, ff, 1, 0, callback, closure); + callback(board, flags, NormalMove, rf, ff, rf, ff, closure); + if(killX >= 0) break; + Bishop(board, flags, rf, ff, callback, closure); + SlideSideways(board, flags, rf, ff, callback, closure); + SlideBackward(board, flags, rf, ff, callback, closure); + break; + + case SHOGI BlackUnicorn: + Sting(board, flags, rf, ff, -1, 0, callback, closure); + callback(board, flags, NormalMove, rf, ff, rf, ff, closure); + if(killX >= 0) break; + Bishop(board, flags, rf, ff, callback, closure); + SlideSideways(board, flags, rf, ff, callback, closure); + SlideForward(board, flags, rf, ff, callback, closure); + break; + + case SHOGI WhiteFalcon: + Sting(board, flags, rf, ff, 1, 1, callback, closure); + Sting(board, flags, rf, ff, 1, -1, callback, closure); + callback(board, flags, NormalMove, rf, ff, rf, ff, closure); + if(killX >= 0) break; + Rook(board, flags, rf, ff, callback, closure); + SlideDiagBackward(board, flags, rf, ff, callback, closure); + break; + + case SHOGI BlackFalcon: + Sting(board, flags, rf, ff, -1, 1, callback, closure); + Sting(board, flags, rf, ff, -1, -1, callback, closure); + callback(board, flags, NormalMove, rf, ff, rf, ff, closure); + if(killX >= 0) break; + Rook(board, flags, rf, ff, callback, closure); + SlideDiagForward(board, flags, rf, ff, callback, closure); + break; + + case SHOGI WhiteDolphin: + case SHOGI BlackHorse: + SlideDiagBackward(board, flags, rf, ff, callback, closure); + SlideVertical(board, flags, rf, ff, callback, closure); + break; + + case SHOGI BlackDolphin: + case SHOGI WhiteHorse: + SlideDiagForward(board, flags, rf, ff, callback, closure); + SlideVertical(board, flags, rf, ff, callback, closure); + break; + + case SHOGI WhiteLance: + SlideForward(board, flags, rf, ff, callback, closure); + break; + + case SHOGI BlackLance: + SlideBackward(board, flags, rf, ff, callback, closure); + break; + + case WhiteFalcon: // [HGM] wild: for wildcards, self-capture symbolizes move to anywhere + case BlackFalcon: + case WhiteCobra: + case BlackCobra: + callback(board, flags, NormalMove, rf, ff, rf, ff, closure); + break; + + } + } +} + + +typedef struct { + MoveCallback cb; + VOIDSTAR cl; +} GenLegalClosure; + +int rFilter, fFilter; // [HGM] speed: sorry, but I get a bit tired of this closure madness +Board xqCheckers, nullBoard; + +extern void GenLegalCallback P((Board board, int flags, ChessMove kind, + int rf, int ff, int rt, int ft, + VOIDSTAR closure)); + +void +GenLegalCallback (Board board, int flags, ChessMove kind, int rf, int ff, int rt, int ft, VOIDSTAR closure) +{ + register GenLegalClosure *cl = (GenLegalClosure *) closure; + + if(rFilter >= 0 && rFilter != rt || fFilter >= 0 && fFilter != ft) return; // [HGM] speed: ignore moves with wrong to-square + + if ((int)board[EP_STATUS] == EP_IRON_LION && (board[rt][ft] == WhiteLion || board[rt][ft] == BlackLion)) return; //[HGM] lion + + if (!(flags & F_IGNORE_CHECK) ) { + int check, promo = (gameInfo.variant == VariantSpartan && kind == BlackPromotion); + if(promo) { + int r, f, kings=0; + for(r=0; r= 2) + promo = 0; + else + board[rf][ff] = BlackKing; // [HGM] spartan: promote to King before check-test + } + check = CheckTest(board, flags, rf, ff, rt, ft, + kind == WhiteCapturesEnPassant || + kind == BlackCapturesEnPassant); + if(promo) board[rf][ff] = BlackLance; + if(check) return; + } + if (flags & F_ATOMIC_CAPTURE) { + if (board[rt][ft] != EmptySquare || + kind == WhiteCapturesEnPassant || kind == BlackCapturesEnPassant) { + int r, f; + ChessSquare king = (flags & F_WHITE_ON_MOVE) ? WhiteKing : BlackKing; + 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 < BOARD_HEIGHT && f >= BOARD_LEFT && f < BOARD_RGHT && + board[r][f] == king) return; + } + } + } + } + cl->cb(board, flags, kind, rf, ff, rt, ft, cl->cl); +} + + +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. [HGM] add castlingRights parameter */ +int +GenLegal (Board board, int flags, MoveCallback callback, VOIDSTAR closure, ChessSquare filter) +{ + GenLegalClosure cl; + int ff, ft, k, left, right, swap; + int ignoreCheck = (flags & F_IGNORE_CHECK) != 0; + ChessSquare wKing = WhiteKing, bKing = BlackKing, *castlingRights = board[CASTLING]; + int inCheck = !ignoreCheck && CheckTest(board, flags, -1, -1, -1, -1, FALSE); // kludge alert: this would mark pre-existing checkers if status==1 + char *p; + + cl.cb = callback; + cl.cl = closure; + xqCheckers[EP_STATUS] *= 2; // quasi: if previous CheckTest has been marking, we now set flag for suspending same checkers + if(filter == EmptySquare) rFilter = fFilter = -1; // [HGM] speed: do not filter on square if we do not filter on piece + GenPseudoLegal(board, flags, GenLegalCallback, (VOIDSTAR) &cl, filter); + + if (inCheck) return TRUE; + + /* Generate castling moves */ + if(gameInfo.variant == VariantKnightmate) { /* [HGM] Knightmate */ + wKing = WhiteUnicorn; bKing = BlackUnicorn; + } + + p = (flags & F_WHITE_ON_MOVE ? pieceDesc[wKing] : pieceDesc[bKing]); + if(p && strchr(p, 'O')) return FALSE; // [HGM] gen: castlings were already generated from string + + 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] == 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] != NoRights && /* [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==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] == wKing && + board[0][ff - 1] == EmptySquare && + board[0][ff - 2] == EmptySquare && + board[0][BOARD_LEFT+2] == EmptySquare && + board[0][BOARD_LEFT+1] == EmptySquare && + board[0][BOARD_LEFT+0] == WhiteRook && + castlingRights[1] != NoRights && /* [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==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[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] != NoRights && /* [HGM] check rights */ + ( castlingRights[5] == ff || castlingRights[7] == ff ) && + (ignoreCheck || + (!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==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[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] != NoRights && /* [HGM] check rights */ + ( castlingRights[5] == ff || castlingRights[7] == ff ) && + (ignoreCheck || + (!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==BOARD_WIDTH>>1 ? BlackQueenSideCastle : BlackQueenSideCastleWild, + BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ff - ((gameInfo.boardWidth+2)>>2), closure); + } + } + + if((swap = gameInfo.variant == VariantSChess) || flags & F_FRC_TYPE_CASTLING) { + + /* generate all potential FRC castling moves (KxR), ignoring flags */ + /* [HGM] test if the Rooks we find have castling rights */ + /* In S-Chess we generate RxK for allowed castlings, for gating at Rook square */ + + + if ((flags & F_WHITE_ON_MOVE) != 0) { + ff = castlingRights[2]; /* King file if we have any rights */ + if(ff != NoRights && 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 != NoRights; k++) /* first test if blocked */ + if(k != ft && board[0][k] != EmptySquare) ft = NoRights; + for(k=left; k BOARD_LEFT+2) + for(k=left+1; k<=right && ft != NoRights; k++) /* then if not checked */ + if(!ignoreCheck && CheckTest(board, flags, 0, ff, 0, k, FALSE)) ft = NoRights; + if(ft != NoRights && board[0][ft] == WhiteRook) { + if(flags & F_FRC_TYPE_CASTLING) callback(board, flags, WhiteASideCastleFR, 0, ff, 0, ft, closure); + if(swap) callback(board, flags, WhiteASideCastleFR, 0, ft, 0, ff, closure); + } + } + } else { + ff = castlingRights[5]; /* King file if we have any rights */ + if(ff != NoRights && 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 != NoRights; k++) /* first test if blocked */ + if(k != ft && board[BOARD_HEIGHT-1][k] != EmptySquare) ft = NoRights; + for(k=left; k BOARD_LEFT+2) + for(k=left+1; k<=right && ft != NoRights; k++) /* then if not checked */ + if(!ignoreCheck && CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, k, FALSE)) ft = NoRights; + if(ft != NoRights && board[BOARD_HEIGHT-1][ft] == BlackRook) { + if(flags & F_FRC_TYPE_CASTLING) callback(board, flags, BlackASideCastleFR, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ft, closure); + if(swap) callback(board, flags, BlackASideCastleFR, BOARD_HEIGHT-1, ft, BOARD_HEIGHT-1, ff, closure); + } + } + } + + } + + return FALSE; +} + + +typedef struct { + int rking, fking; + int check; +} CheckTestClosure; + + +extern void CheckTestCallback P((Board board, int flags, ChessMove kind, + int rf, int ff, int rt, int ft, + VOIDSTAR closure)); + + +void +CheckTestCallback (Board board, int flags, ChessMove kind, int rf, int ff, int rt, int ft, VOIDSTAR closure) +{ + register CheckTestClosure *cl = (CheckTestClosure *) closure; + + if (rt == cl->rking && ft == cl->fking) { + if((int)xqCheckers[EP_STATUS] >= 2 && xqCheckers[rf][ff]) return; // checker is piece with suspended checking power + cl->check++; + xqCheckers[rf][ff] = xqCheckers[EP_STATUS] & 1; // remember who is checking (if status == 1) + } + if( (int)board[EP_STATUS] == EP_ROYAL_LION && (board[rt][ft] == WhiteLion || board[rt][ft] == BlackLion) + && (gameInfo.variant != VariantLion || board[rf][ff] != WhiteKing && board[rf][ff] != BlackKing) ) + cl->check++; // [HGM] lion: forbidden counterstrike against Lion equated to putting yourself in check +} + + +/* If the player on move were to move from (rf, ff) to (rt, ft), would + he leave himself in check? Or if rf == -1, is the player on move + in check now? enPassant must be TRUE if the indicated move is an + e.p. capture. The possibility of castling out of a check along the + back rank is not accounted for (i.e., we still return nonzero), as + this is illegal anyway. Return value is the number of times the + king is in check. */ +int +CheckTest (Board board, int flags, int rf, int ff, int rt, int ft, int enPassant) +{ + CheckTestClosure cl; + ChessSquare king = flags & F_WHITE_ON_MOVE ? WhiteKing : BlackKing; + ChessSquare captured = EmptySquare, ep=0, trampled=0, trampled2 = 0; + int saveKill = killX; + /* 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(gameInfo.variant == VariantChu || gameInfo.variant == VariantShogi) { // strictly speaking this is not needed, as Chu officially has no check + int r, f, k = king, royals=0, prince = flags & F_WHITE_ON_MOVE ? WhiteMonarch : BlackMonarch; + if(gameInfo.variant == VariantShogi) prince -= 11; // White/BlackFalcon + for(r=0; r 1) return FALSE; // no check if we have two royals (ignores double captureby Lion!) + king = board[r][f]; // remember hich one we had + } + } + } + + if (rt >= 0) { + if (enPassant) { + captured = board[rf][ft]; + board[rf][ft] = EmptySquare; + } else { + captured = board[rt][ft]; + if(killX >= 0) { + trampled = board[killY][killX]; board[killY][killX] = EmptySquare; killX = -1; saveKill += (kill2X << 16) + (1 << 30); + if(kill2X >= 0) { trampled2 = board[kill2Y][kill2X]; board[kill2Y][kill2X] = EmptySquare; kill2X = -1; } + } + } + if(rf == DROP_RANK) board[rt][ft] = ff; else { // [HGM] drop + board[rt][ft] = board[rf][ff]; + if(rf != rt || ff != ft) board[rf][ff] = EmptySquare; + } + ep = board[EP_STATUS]; + if( captured == WhiteLion || captured == BlackLion ) { // [HGM] lion: Chu Lion-capture rules + ChessSquare victim = saveKill < 0 ? EmptySquare : trampled; + if( (board[rt][ft] == WhiteLion || board[rt][ft] == BlackLion) && // capturer is Lion + (ff - ft > 1 || ft - ff > 1 || rf - rt > 1 || rt - rf > 1) && // captures from a distance + (victim == EmptySquare || victim == WhitePawn || victim == BlackPawn // no or worthless 'bridge' + || victim == WhiteCobra || victim == BlackCobra) ) // (Pawn or Go Between) + board[EP_STATUS] = EP_ROYAL_LION; // on distant Lion x Lion victim must not be pseudo-legally protected + } + } + + /* For compatibility with ICS wild 9, we scan the board in the + order a1, a2, a3, ... b1, b2, ..., h8 to find the first king, + and we test only whether that one is in check. */ + 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) { + cl.check = 0; + 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=0 && i0 ? BlackWazir : WhiteWazir) ) + cl.check++; + } + GenPseudoLegal(board, flags ^ F_WHITE_ON_MOVE, CheckTestCallback, (VOIDSTAR) &cl, EmptySquare); + if(gameInfo.variant != VariantSpartan || cl.check == 0) // in Spartan Chess go on to test if other King is checked too + goto undo_move; /* 2-level break */ + } + } + + undo_move: + + if (rt >= 0) { + if(rf != DROP_RANK) // [HGM] drop + board[rf][ff] = board[rt][ft]; + if (enPassant) { + board[rf][ft] = captured; + board[rt][ft] = EmptySquare; + } else { + if(saveKill >= 0) { + if(saveKill & 1<<30) board[kill2Y][kill2X = saveKill >> 16 & 0xFFF] = trampled2; + board[killY][killX = saveKill & 0xFFF] = trampled; + } + board[rt][ft] = captured; + } + board[EP_STATUS] = ep; + } + + return cl.fking < BOARD_RGHT ? cl.check : 1000; // [HGM] atomic: return 1000 if we have no king +} + +int +HasLion (Board board, int flags) +{ + int lion = F_WHITE_ON_MOVE & flags ? WhiteLion : BlackLion; + int r, f; + for(r=0; r BOARD_HEIGHT-3 || + piece == BlackKnight && rt < 2 ) return IllegalMove; // e.g. where dropped piece has no moves + if(piece == WhitePawn || piece == BlackPawn) { + int r, max = 1 + (BOARD_HEIGHT == 7); // two Pawns per file in Tori! + for(r=1; rcaptures++; // [HGM] losers: count legal captures + if (rf == cl->rf && ff == cl->ff && rt == cl->rt && ft == cl->ft) + cl->kind = kind; +} + +ChessMove +LegalityTest (Board board, int flags, int rf, int ff, int rt, int ft, int promoChar) +{ + LegalityTestClosure cl; ChessSquare piece, filterPiece; + + if(quickFlag) flags = flags & ~1 | quickFlag & 1; // [HGM] speed: in quick mode quickFlag specifies side-to-move. + if(rf == DROP_RANK) return LegalDrop(board, flags, ff, rt, ft); + piece = filterPiece = board[rf][ff]; + if(PieceToChar(piece) == '~') filterPiece = DEMOTED(piece); + + /* [HGM] 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) && gameInfo.variant != VariantChu && !pieceDesc[piece]) + return CheckTest(board, flags, rf, ff, rt, ft, FALSE) ? IllegalMove : NormalMove; + + cl.rf = rf; + cl.ff = ff; + cl.rt = rFilter = rt; // [HGM] speed: filter on to-square + cl.ft = fFilter = ft; + cl.kind = IllegalMove; + cl.captures = 0; // [HGM] losers: prepare to count legal captures. + if(flags & F_MANDATORY_CAPTURE) filterPiece = EmptySquare; // [HGM] speed: do not filter in suicide, to find all captures + GenLegal(board, flags, LegalityTestCallback, (VOIDSTAR) &cl, filterPiece); + 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(promoChar == 'x') promoChar = NULLCHAR; // [HGM] is this ever the case? + if(gameInfo.variant == VariantSChess && promoChar && promoChar != '=' && board[rf][ff] != WhitePawn && board[rf][ff] != BlackPawn) { + if(board[rf][ff] < BlackPawn) { // white + if(rf != 0) return IllegalMove; // must be on back rank + if(!(board[VIRGIN][ff] & VIRGIN_W)) return IllegalMove; // non-virgin + if(board[PieceToNumber(CharToPiece(ToUpper(promoChar)))][BOARD_WIDTH-2] == 0) return ImpossibleMove;// must be in stock + if(cl.kind == WhiteHSideCastleFR && (ff == BOARD_RGHT-2 || ff == BOARD_RGHT-3)) return ImpossibleMove; + if(cl.kind == WhiteASideCastleFR && (ff == BOARD_LEFT+2 || ff == BOARD_LEFT+3)) return ImpossibleMove; + } else { + if(rf != BOARD_HEIGHT-1) return IllegalMove; + if(!(board[VIRGIN][ff] & VIRGIN_B)) return IllegalMove; // non-virgin + if(board[BOARD_HEIGHT-1-PieceToNumber(CharToPiece(ToLower(promoChar)))][1] == 0) return ImpossibleMove; + if(cl.kind == BlackHSideCastleFR && (ff == BOARD_RGHT-2 || ff == BOARD_RGHT-3)) return ImpossibleMove; + if(cl.kind == BlackASideCastleFR && (ff == BOARD_LEFT+2 || ff == BOARD_LEFT+3)) return ImpossibleMove; + } + } else + if(gameInfo.variant == VariantChu) { + if(cl.kind != NormalMove || promoChar == NULLCHAR || promoChar == '=') return cl.kind; + if(promoChar != '+') + return CharToPiece(promoChar) == EmptySquare ? ImpossibleMove : IllegalMove; + if(PieceToChar(CHUPROMOTED(board[rf][ff])) != '+') { + if(PieceToChar(CHUPROMOTED (board[rf][ff] < BlackPawn ? WhitePawn : BlackPawn)) != '.') + return ImpossibleMove; + } + return flags & F_WHITE_ON_MOVE ? WhitePromotion : BlackPromotion; + } else + if(gameInfo.variant == VariantShogi) { + /* [HGM] Shogi promotions. '=' means defer */ + if(rf != DROP_RANK && cl.kind == NormalMove) { + ChessSquare piece = board[rf][ff]; + int zone = BOARD_HEIGHT/3 + (BOARD_HEIGHT == 8); + + if(promoChar == PieceToChar(BlackQueen)) promoChar = NULLCHAR; /* [HGM] Kludge */ + if(promoChar == 'd' && (piece == WhiteRook || piece == BlackRook) || + promoChar == 'h' && (piece == WhiteBishop || piece == BlackBishop) || + promoChar == 'g' && (piece <= WhiteFerz || piece <= BlackFerz && piece >= BlackPawn) ) + promoChar = '+'; // allowed ICS notations +if(appData.debugMode)fprintf(debugFP,"SHOGI promoChar = %c\n", promoChar ? promoChar : '-'); + if(promoChar != NULLCHAR && promoChar != '+' && promoChar != '=') + return CharToPiece(promoChar) == EmptySquare ? ImpossibleMove : IllegalMove; + else if(flags & F_WHITE_ON_MOVE) { + if( (int) piece < (int) WhiteWazir && + (rf >= BOARD_HEIGHT - zone || rt >= BOARD_HEIGHT - zone) ) { + if( (piece == WhitePawn || piece == WhiteQueen) && rt > BOARD_HEIGHT-2 || + piece == WhiteKnight && rt > BOARD_HEIGHT-3) /* promotion mandatory */ + cl.kind = promoChar == '=' ? IllegalMove : WhitePromotion; + else /* promotion optional, default is defer */ + cl.kind = promoChar == '+' ? WhitePromotion : WhiteNonPromotion; + } else cl.kind = promoChar == '+' ? IllegalMove : NormalMove; + } else { + if( (int) piece < (int) BlackWazir && (rf < zone || rt < zone) ) { + if( (piece == BlackPawn || piece == BlackQueen) && rt < 1 || + piece == BlackKnight && rt < 2 ) /* promotion obligatory */ + cl.kind = promoChar == '=' ? IllegalMove : BlackPromotion; + else /* promotion optional, default is defer */ + cl.kind = promoChar == '+' ? BlackPromotion : BlackNonPromotion; + } else cl.kind = promoChar == '+' ? IllegalMove : NormalMove; + } + } + } else + if (promoChar != NULLCHAR) { + if(cl.kind == NormalMove && promoChar == '+') { // allow shogi-style promotion is pieceToChar specifies them + ChessSquare piece = board[rf][ff]; + if(piece < BlackPawn ? piece > WhiteMan : piece > BlackMan) return ImpossibleMove; // already promoted + // should test if in zone, really + if(gameInfo.variant == VariantChuChess && (piece == WhiteKnight || piece == BlackKnight) && HasLion(board, flags)) + return IllegalMove; + if(PieceToChar(PROMOTED(piece)) == '+') return flags & F_WHITE_ON_MOVE ? WhitePromotion : BlackPromotion; + } else + if(promoChar == '=') cl.kind = IllegalMove; else // [HGM] shogi: no deferred promotion outside Shogi + if (cl.kind == WhitePromotion || cl.kind == BlackPromotion) { + ChessSquare piece = CharToPiece(flags & F_WHITE_ON_MOVE ? ToUpper(promoChar) : ToLower(promoChar)); + if(piece == EmptySquare) + cl.kind = ImpossibleMove; // non-existing piece + if(gameInfo.variant == VariantChuChess && promoChar == 'l' && HasLion(board, flags)) { + cl.kind = IllegalMove; // no two Lions + } else if(gameInfo.variant == VariantSpartan && cl.kind == BlackPromotion ) { + if(promoChar != PieceToChar(BlackKing)) { + if(CheckTest(board, flags, rf, ff, rt, ft, FALSE)) cl.kind = IllegalMove; // [HGM] spartan: only promotion to King was possible + if(piece == BlackLance) cl.kind = ImpossibleMove; + } else { // promotion to King allowed only if we do not have two yet + int r, f, kings = 0; + for(r=0; rcount++; +} + +/* Return MT_NONE, MT_CHECK, MT_CHECKMATE, or MT_STALEMATE */ +int +MateTest (Board board, int flags) +{ + MateTestClosure cl; + int inCheck, r, f, myPieces=0, hisPieces=0, nrKing=0; + ChessSquare king = flags & F_WHITE_ON_MOVE ? WhiteKing : BlackKing; + + for(r=0; r= (int)king - (int)WhiteKing + (int)WhitePawn) + myPieces++; + else 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, MateTestCallback, (VOIDSTAR) &cl, EmptySquare); + // [HGM] 3check: yet to do! + if (cl.count > 0) { + return inCheck ? MT_CHECK : MT_NONE; + } else { + if(gameInfo.holdingsWidth && gameInfo.variant != VariantSuper && gameInfo.variant != VariantGreat + && gameInfo.variant != VariantSChess && gameInfo.variant != VariantGrand) { // drop game + int r, f, n, holdings = flags & F_WHITE_ON_MOVE ? BOARD_WIDTH-1 : 0; + for(r=0; r 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 || IS_SHOGI(gameInfo.variant)) ? + MT_STAINMATE : MT_STALEMATE; + } +} + + +extern void DisambiguateCallback P((Board board, int flags, ChessMove kind, + int rf, int ff, int rt, int ft, + VOIDSTAR closure)); + +void +DisambiguateCallback (Board board, int flags, ChessMove kind, int rf, int ff, int rt, int ft, VOIDSTAR closure) +{ + register DisambiguateClosure *cl = (DisambiguateClosure *) closure; + int wildCard = FALSE; ChessSquare piece = board[rf][ff]; + extern int kifu; // in parser.c + + // [HGM] wild: for wild-card pieces rt and rf are dummies + if(piece == WhiteFalcon || piece == BlackFalcon || + piece == WhiteCobra || piece == BlackCobra) + wildCard = !pieceDefs; // no wildcards when engine defined pieces + + 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 || wildCard) && + (cl->ftIn == -1 || cl->ftIn == ft || wildCard)) { + + if(cl->count && rf == cl->rf && ff == cl->ff && rt == cl->rt && ft == cl->ft) return; // duplicate move + + if(cl->count == 1 && kifu & 0x7E && cl->rfIn == -1 && cl->ffIn == -1) { // traditional Shogi disambiguation required + int this = 1, other = 1; + if(kifu & 2) this &= (flags & 1 ? rt > rf : rt < rf), other &= (flags & 1 ? cl->rt > cl->rf : cl->rt < cl->rf); + if(kifu & 4) this &= (flags & 1 ? rt < rf : rt > rf), other &= (flags & 1 ? cl->rt < cl->rf : cl->rt > cl->rf); + if(kifu & 8) this &= (rf == rt), other &= (cl->rt == cl->rf); + if(kifu & 0x10) this &= (flags & 1 ? ft <= ff : ft >= ff), other &= (flags & 1 ? cl->ft <= cl->ff : cl->ft >= cl->ff); + if(kifu & 0x20) this &= (flags & 1 ? ft >= ff : ft <= ff), other &= (flags & 1 ? cl->ft >= cl->ff : cl->ft <= cl->ff); + if(kifu & 0x40) this &= (ft == ff), other &= (cl->ft == cl->ff); // should never be used + if(!other) cl->count--; // the old move did not satisfy the requested relative position, erase it + if(!this) return; // the current move does not satisfy the requested relative position, ignore it + } + + cl->count++; + if(cl->count == 1 || board[rt][ft] != EmptySquare) { + // [HGM] oneclick: if multiple moves, be sure we remember capture + cl->piece = board[rf][ff]; + cl->rf = rf; + cl->ff = ff; + cl->rt = wildCard ? cl->rtIn : rt; + cl->ft = wildCard ? cl->ftIn : ft; + cl->kind = kind; + } + cl->captures += (board[rt][ft] != EmptySquare); // [HGM] oneclick: count captures + } +} + +void +Disambiguate (Board board, int flags, DisambiguateClosure *closure) +{ + int illegal = 0; char c = closure->promoCharIn; + + if(quickFlag) flags = flags & ~1 | quickFlag & 1; // [HGM] speed: in quick mode quickFlag specifies side-to-move. + closure->count = closure->captures = 0; + closure->rf = closure->ff = closure->rt = closure->ft = 0; + closure->kind = ImpossibleMove; + rFilter = closure->rtIn; // [HGM] speed: only consider moves to given to-square + fFilter = closure->ftIn; + if(quickFlag) { // [HGM] speed: try without check test first, because if that is not ambiguous, we are happy + GenLegal(board, flags|F_IGNORE_CHECK, DisambiguateCallback, (VOIDSTAR) closure, closure->pieceIn); + if(closure->count > 1) { // gamble did not pay off. retry with check test to resolve ambiguity + closure->count = closure->captures = 0; + closure->rf = closure->ff = closure->rt = closure->ft = 0; + closure->kind = ImpossibleMove; + GenLegal(board, flags, DisambiguateCallback, (VOIDSTAR) closure, closure->pieceIn); // [HGM] speed: only pieces of requested type + } + } else + GenLegal(board, flags, DisambiguateCallback, (VOIDSTAR) closure, closure->pieceIn); // [HGM] speed: only pieces of requested type + if (closure->count == 0) { + /* See if it's an illegal move due to check */ + illegal = 1; + GenLegal(board, flags|F_IGNORE_CHECK, DisambiguateCallback, (VOIDSTAR) closure, closure->pieceIn); + if (closure->count == 0) { + /* No, it's not even that */ + if(!appData.testLegality && !pieceDefs && closure->pieceIn != EmptySquare) { + int f, r; // if there is only a single piece of the requested type on the board, use that + closure->rt = closure->rtIn, closure->ft = closure->ftIn; + for(r=0; rpieceIn) closure->count++, closure->rf = r, closure->ff = f; + if(closure->count > 1) illegal = 0; // ambiguous + } + if(closure->count == 0) { + if (appData.debugMode) { int i, j; + for(i=BOARD_HEIGHT-1; i>=0; i--) { + for(j=0; jcount > 1 && closure->rtIn >=0) { // [HGM] gen: move is ambiguous under engine-defined rules (and not one-click) + DisambiguateClosure spare = *closure; + pieceDefs = FALSE; spare.count = 0; // See if the (erroneous) built-in rules would resolve that + GenLegal(board, flags, DisambiguateCallback, (VOIDSTAR) &spare, closure->pieceIn); + if(spare.count == 1) *closure = spare; // It does, so use those in stead (game from file saved before gen patch?) + pieceDefs = TRUE; + } + + if (c == 'x') c = NULLCHAR; // get rid of any 'x' (which should never happen?) + if(gameInfo.variant == VariantSChess && c && c != '=' && closure->piece != WhitePawn && closure->piece != BlackPawn) { + if(closure->piece < BlackPawn) { // white + if(closure->rf != 0) closure->kind = IllegalMove; // must be on back rank + if(!(board[VIRGIN][closure->ff] & VIRGIN_W)) closure->kind = IllegalMove; // non-virgin + if(board[PieceToNumber(CharToPiece(ToUpper(c)))][BOARD_WIDTH-2] == 0) closure->kind = ImpossibleMove;// must be in stock + if(closure->kind == WhiteHSideCastleFR && (closure->ff == BOARD_RGHT-2 || closure->ff == BOARD_RGHT-3)) closure->kind = ImpossibleMove; + if(closure->kind == WhiteASideCastleFR && (closure->ff == BOARD_LEFT+2 || closure->ff == BOARD_LEFT+3)) closure->kind = ImpossibleMove; + } else { + if(closure->rf != BOARD_HEIGHT-1) closure->kind = IllegalMove; + if(!(board[VIRGIN][closure->ff] & VIRGIN_B)) closure->kind = IllegalMove; // non-virgin + if(board[BOARD_HEIGHT-1-PieceToNumber(CharToPiece(ToLower(c)))][1] == 0) closure->kind = ImpossibleMove; + if(closure->kind == BlackHSideCastleFR && (closure->ff == BOARD_RGHT-2 || closure->ff == BOARD_RGHT-3)) closure->kind = ImpossibleMove; + if(closure->kind == BlackASideCastleFR && (closure->ff == BOARD_LEFT+2 || closure->ff == BOARD_LEFT+3)) closure->kind = ImpossibleMove; + } + } else + if(gameInfo.variant == VariantChu) { + if(c == '+') closure->kind = (flags & F_WHITE_ON_MOVE ? WhitePromotion : BlackPromotion); // for now, accept any + } else + if(gameInfo.variant == VariantShogi) { + /* [HGM] Shogi promotions. On input, '=' means defer, '+' promote. Afterwards, c is set to '+' for promotions, NULL other */ + if(closure->rfIn != DROP_RANK && closure->kind == NormalMove) { + ChessSquare piece = closure->piece; + int zone = BOARD_HEIGHT/3 + (BOARD_HEIGHT == 8); + if (c == 'd' && (piece == WhiteRook || piece == BlackRook) || + c == 'h' && (piece == WhiteBishop || piece == BlackBishop) || + c == 'g' && (piece <= WhiteFerz || piece <= BlackFerz && piece >= BlackPawn) ) + c = '+'; // allowed ICS notations + if(c != NULLCHAR && c != '+' && c != '=') closure->kind = IllegalMove; // otherwise specifying a piece is illegal + else if(flags & F_WHITE_ON_MOVE) { + if( (int) piece < (int) WhiteWazir && + (closure->rf >= BOARD_HEIGHT-zone || closure->rt >= BOARD_HEIGHT-zone) ) { + if( (piece == WhitePawn || piece == WhiteQueen) && closure->rt > BOARD_HEIGHT-2 || + piece == WhiteKnight && closure->rt > BOARD_HEIGHT-3) /* promotion mandatory */ + closure->kind = c == '=' ? IllegalMove : WhitePromotion; + else /* promotion optional, default is defer */ + closure->kind = c == '+' ? WhitePromotion : WhiteNonPromotion; + } else closure->kind = c == '+' ? IllegalMove : NormalMove; + } else { + if( (int) piece < (int) BlackWazir && (closure->rf < zone || closure->rt < zone) ) { + if( (piece == BlackPawn || piece == BlackQueen) && closure->rt < 1 || + piece == BlackKnight && closure->rt < 2 ) /* promotion obligatory */ + closure->kind = c == '=' ? IllegalMove : BlackPromotion; + else /* promotion optional, default is defer */ + closure->kind = c == '+' ? BlackPromotion : BlackNonPromotion; + } else closure->kind = c == '+' ? IllegalMove : NormalMove; + } + } + if(closure->kind == WhitePromotion || closure->kind == BlackPromotion) c = '+'; else + if(closure->kind == WhiteNonPromotion || closure->kind == BlackNonPromotion) c = '='; + } else + if (closure->kind == WhitePromotion || closure->kind == BlackPromotion) { + if(c == NULLCHAR) { // missing promoChar on mandatory promotion; use default for variant + if(gameInfo.variant == VariantShatranj || gameInfo.variant == VariantCourier || + gameInfo.variant == VariantMakruk) + c = PieceToChar(BlackFerz); + else if(gameInfo.variant == VariantASEAN) + c = PieceToChar(BlackRook); + else if(gameInfo.variant == VariantGreat) + c = PieceToChar(BlackMan); + else if(gameInfo.variant == VariantGrand) + closure->kind = closure->rt != 0 && closure->rt != BOARD_HEIGHT-1 ? NormalMove : AmbiguousMove; // no default in Grand Chess + else + c = PieceToChar(BlackQueen); + } else if(c == '=') closure->kind = IllegalMove; // no deferral outside Shogi + else if(c == 'l' && gameInfo.variant == VariantChuChess && HasLion(board, flags)) closure->kind = IllegalMove; + } else if (c == '+') { // '+' outside shogi, check if pieceToCharTable enabled it + ChessSquare p = closure->piece; + if(p > WhiteMan && p < BlackPawn || p > BlackMan || PieceToChar(PROMOTED(p)) != '+') + closure->kind = ImpossibleMove; // used on non-promotable piece + else if(gameInfo.variant == VariantChuChess && HasLion(board, flags)) closure->kind = IllegalMove; + } else if (c != NULLCHAR) closure->kind = IllegalMove; + + closure->promoChar = ToLower(c); // this can be NULLCHAR! Note we keep original promoChar even if illegal. + if(c != '+' && c != '=' && c != NULLCHAR && CharToPiece(flags & F_WHITE_ON_MOVE ? ToUpper(c) : ToLower(c)) == EmptySquare) + closure->kind = ImpossibleMove; // but we cannot handle non-existing piece types! + if (closure->count > 1) { + closure->kind = AmbiguousMove; + } + if (illegal) { + /* Note: If more than one illegal move matches, but no legal + moves, we return IllegalMove, not AmbiguousMove. Caller + can look at closure->count to detect this. + */ + closure->kind = IllegalMove; + } +} + + +typedef struct { + /* Input */ + ChessSquare piece; + int rf, ff, rt, ft; + /* Output */ + ChessMove kind; + int rank; + int file; + int either; +} CoordsToAlgebraicClosure; + +extern void CoordsToAlgebraicCallback P((Board board, int flags, + ChessMove kind, int rf, int ff, + int rt, int ft, VOIDSTAR closure)); + +void +CoordsToAlgebraicCallback (Board board, int flags, ChessMove kind, int rf, int ff, int rt, int ft, VOIDSTAR closure) +{ + register CoordsToAlgebraicClosure *cl = + (CoordsToAlgebraicClosure *) closure; + + if ((rt == cl->rt && ft == cl->ft || rt == rf && ft == ff) && // [HGM] null move matches any toSquare + (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 */ + } else { + cl->file++; /* need file to rule out this move */ + } + } else { + if (ff == cl->ff) { + cl->rank++; /* need rank to rule out this move */ + } else { + cl->either++; /* rank or file will rule out this move */ + } + } + } +} + +/* Convert coordinates to normal algebraic notation. + promoChar must be NULLCHAR or 'x' if not a promotion. +*/ +ChessMove +CoordsToAlgebraic (Board board, int flags, int rf, int ff, int rt, int ft, int promoChar, char out[MOVE_LEN]) +{ + ChessSquare piece; + ChessMove kind; + char *outp = out, c, capture; + CoordsToAlgebraicClosure cl; + + if (rf == DROP_RANK) { + if(ff == EmptySquare) { strncpy(outp, "--",3); return NormalMove; } // [HGM] pass + /* Bughouse piece drop */ + *outp++ = ToUpper(PieceToChar((ChessSquare) ff)); + *outp++ = '@'; + *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)); + + switch (piece) { + case WhitePawn: + case BlackPawn: + kind = LegalityTest(board, flags, 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, rf, ff, rt, ft, promoChar); + if (kind == IllegalMove) break; + kind = IllegalMove; + } + /* Pawn move */ + *outp++ = ff + AAA; + capture = board[rt][ft] != EmptySquare || kind == WhiteCapturesEnPassant || kind == BlackCapturesEnPassant; + if (ff == ft && !capture) { /* [HGM] Xiangqi has straight noncapts! */ + /* Non-capture; use style "e5" */ + 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" */ + if(capture) + *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" */ + *outp = NULLCHAR; + if (promoChar != NULLCHAR) { + if(IS_SHOGI(gameInfo.variant)) { + /* [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) + safeStrCpy(out, "O-O", MOVE_LEN); + else + safeStrCpy(out, "O-O-O", MOVE_LEN); + return LegalityTest(board, flags, 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 */ + else if (rf == rt && + rf == ((piece == WhiteKing) ? 0 : BOARD_HEIGHT-1) && + (ft - ff > 1 || ff - ft > 1) && // No castling if legal King move (on narrow boards!) + ((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) + snprintf(out, MOVE_LEN, "O-O%c%c", promoChar ? '/' : 0, ToUpper(promoChar)); + else + snprintf(out, MOVE_LEN, "O-O-O%c%c", promoChar ? '/' : 0, ToUpper(promoChar)); + + /* 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 + possible for the other. ICS rules for wild 9 + effectively make castling illegal for either king in + 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, rf, ff, rt, ft, promoChar); + } + + /* else fall through */ + default: + /* Piece move */ + cl.rf = rf; + cl.ff = ff; + cl.rt = rFilter = rt; // [HGM] speed: filter on to-square + cl.ft = fFilter = ft; + cl.piece = piece; + cl.kind = IllegalMove; + cl.rank = cl.file = cl.either = 0; + c = PieceToChar(piece) ; + GenLegal(board, flags, CoordsToAlgebraicCallback, (VOIDSTAR) &cl, c!='~' ? piece : (DEMOTED(piece))); // [HGM] speed + + 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, CoordsToAlgebraicCallback, (VOIDSTAR) &cl, c!='~' ? piece : (DEMOTED(piece))); + if (cl.kind == IllegalMove) break; + cl.kind = IllegalMove; + } + + /* Style is "Nf3" or "Nxf7" if this is unambiguous, + else "Ngf3" or "Ngxf7", + else "N1f3" or "N5xf7", + else "Ng1f3" or "Ng5xf7". + */ + if( c == '~' || c == '+') { + /* [HGM] print nonexistent piece as its demoted version */ + piece = (ChessSquare) (CHUDEMOTED(piece)); + } + if(c=='+') *outp++ = c; + *outp++ = ToUpper(PieceToChar(piece)); + if(*outp = PieceSuffix(piece)) outp++; + + if (cl.file || (cl.either && !cl.rank)) { + *outp++ = ff + AAA; + } + if (cl.rank) { + 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 + AAA; + if(rt+ONE <= '9') + *outp++ = rt + ONE; + else { *outp++ = (rt+ONE-'0')/10 + '0';*outp++ = (rt+ONE-'0')%10 + '0'; } + if (IS_SHOGI(gameInfo.variant)) { + /* [HGM] in Shogi non-pawns can promote */ + *outp++ = promoChar; // Don't bother to correct move type, return value is never used! + } + else if (gameInfo.variant == VariantChuChess && promoChar || + gameInfo.variant != VariantSuper && promoChar && + (piece == WhiteLance || piece == BlackLance) ) { // Lance sometimes represents Pawn + *outp++ = '='; + *outp++ = ToUpper(promoChar); + } + else if (gameInfo.variant == VariantSChess && promoChar) { // and in S-Chess we have gating + *outp++ = '/'; + *outp++ = ToUpper(promoChar); + } + *outp = NULLCHAR; + return cl.kind; + + case EmptySquare: + /* Moving a nonexistent piece */ + break; + } + + /* Not a legal move, even ignoring check. + If there was a piece on the from square, + use style "Ng1g3" or "Ng1xe8"; + if there was a pawn or nothing (!), + use style "g1g3" or "g1xe8". Use "x" + if a piece was on the to square, even + a piece of the same color. + */ + outp = out; + c = 0; + if (piece != EmptySquare && piece != WhitePawn && piece != BlackPawn) { + int r, f; + for(r=0; r= 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 board, int flags, ChessMove kind, int rf, int ff, int rt, int 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; irt && 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= (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), 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 + CopyBoard(xqCheckers, nullBoard); xqCheckers[EP_STATUS] = 1; + CheckTest(boards[i+1], PosFlags(i+1), -1, -1, -1, -1, FALSE); // if we deliver check with our move, the checkers get marked + // 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); + } + xqCheckers[EP_STATUS] = 2; // causes GenLegal to ignore the checks we delivered with the move, in real life evaded before we captured + GenLegal(boards[i+1], PosFlags(i+1), ProtectedCallback, &cl, EmptySquare); // try all moves + xqCheckers[EP_STATUS] = 0; // disable quasi-legal moves again + // 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