X-Git-Url: http://winboard.nl/cgi-bin?p=xboard.git;a=blobdiff_plain;f=moves.c;h=2a017c3c54892aa62842455f703bc8fa298ecc7c;hp=2070ef37c6c9b2dfaf606e82947a90f5bd1d1409;hb=ca99bd4de57d0b079024cbdf5435de1ae61d5fd9;hpb=7e4f4f5718bf4efee8be4abfc981d18cfd6f8438 diff --git a/moves.c b/moves.c index 2070ef3..2a017c3 100644 --- a/moves.c +++ b/moves.c @@ -1,1407 +1,1845 @@ -/* - * 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', -#ifdef FAIRY - 'F', 'W', 'E', 'H', 'A', 'C', 'G', 'O', 'M', 'U', -#endif - 'K', 'p', 'n', 'b', 'r', 'q', -#ifdef FAIRY - 'f', 'w', 'e', 'h', 'a', 'c', 'g', 'o', 'm', 'u', -#endif - 'k', 'x' - }; - -char PieceToChar(p) - ChessSquare p; -{ - return pieceToChar[(int) p]; -} - -ChessSquare CharToPiece(c) - int c; -{ - int i; - for(i=0; i< (int) EmptySquare; i++) - if(pieceToChar[i] == c) return (ChessSquare) i; - return EmptySquare; -/* [HGM] code marked for deletion - switch (c) { - default: - case 'x': return EmptySquare; - case 'P': return WhitePawn; - case 'R': return WhiteRook; - case 'N': return WhiteKnight; - case 'B': return WhiteBishop; - case 'Q': return WhiteQueen; - case 'K': return WhiteKing; - case 'p': return BlackPawn; - case 'r': return BlackRook; - case 'n': return BlackKnight; - case 'b': return BlackBishop; - case 'q': return BlackQueen; - case 'k': return BlackKing; -#ifdef FAIRY - case 'A': return WhiteCardinal; - case 'C': return WhiteMarshall; - case 'F': return WhiteFerz; - case 'H': return WhiteNightrider; - case 'E': return WhiteAlfil; - case 'W': return WhiteWazir; - case 'U': return WhiteUnicorn; - case 'O': return WhiteCannon; - case 'G': return WhiteGrasshopper; - case 'M': return WhiteMan; - - case 'a': return BlackCardinal; - case 'c': return BlackMarshall; - case 'f': return BlackFerz; - case 'h': return BlackNightrider; - case 'e': return BlackAlfil; - case 'w': return BlackWazir; - case 'u': return BlackUnicorn; - case 'o': return BlackCannon; - case 'g': return BlackGrasshopper; - case 'm': return BlackMan; - -#endif - } -*/ -} - -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(gameInfo.variant == VariantCrazyhouse && - ( (int) piece > (int) WhiteQueen && (int) piece < (int) WhiteKing - || (int) piece > (int) BlackQueen && (int) piece < (int) BlackKing )) - 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: -#ifdef FAIRY - 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; - } -#endif - 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: -#ifdef FAIRY - 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; - } -#endif - 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; - -#ifdef FAIRY - case WhiteUnicorn: - case BlackUnicorn: -#endif - 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; - -#ifdef FAIRY - 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, - rf == BOARD_HEIGHT-2 ? WhitePromotionQueen : 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, - rf == 1 ? BlackPromotionQueen : 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, - rf == BOARD_HEIGHT-2 ? WhitePromotionQueen : 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, - rf == 1 ? BlackPromotionQueen : 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 WhiteCardinal: - case BlackCardinal: - m++; - - /* Shogi Bishops are ordinary Bishops */ - case SHOGI WhiteBishop: - case SHOGI BlackBishop: -#endif - 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; - -#ifdef FAIRY - /* 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 WhiteMarshall: - case SHOGI BlackMarshall: - 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: -#endif - 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; - -#ifdef FAIRY - /* 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) break; - 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: -#endif - 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; - } - } -} - - -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; - int ignoreCheck = (flags & F_IGNORE_CHECK) != 0; - - 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 */ - for (ff = BOARD_WIDTH>>1; ff >= (BOARD_WIDTH-1)>>1; ff-- /*ics wild 1*/) { - if ((flags & F_WHITE_ON_MOVE) && - (flags & F_WHITE_KCASTLE_OK) && - board[0][ff] == WhiteKing && - board[0][ff + 1] == EmptySquare && - board[0][ff + 2] == EmptySquare && - board[0][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) && - !CheckTest(board, flags, 0, ff, 0, ff + 2, FALSE)))) { - - callback(board, flags, - ff==4 ? WhiteKingSideCastle : WhiteKingSideCastleWild, - 0, ff, 0, ff + ((gameInfo.boardWidth+2)>>2), closure); - } - if ((flags & F_WHITE_ON_MOVE) && - (flags & F_WHITE_QCASTLE_OK) && - board[0][ff] == WhiteKing && - 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] == BlackKing && - 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) && - !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), closure); - } - if (!(flags & F_WHITE_ON_MOVE) && - (flags & F_BLACK_QCASTLE_OK) && - board[BOARD_HEIGHT-1][ff] == BlackKing && - 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 - 1, FALSE)))) { - - callback(board, flags, - ff==BOARD_WIDTH>>1 ? BlackQueenSideCastle : BlackQueenSideCastleWild, - BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ff - ((gameInfo.boardWidth+2)>>2), closure); - } - } - - /* PUSH Fabien */ - - /* generate all potential FRC castling moves (KxR), ignoring flags */ - /* [HGM] Tord! Help requested! */ - - if ((flags & F_WHITE_ON_MOVE) != 0) { - - for (ff = BOARD_LEFT+1; ff < BOARD_RGHT-1; ff++) { - if (board[0][ff] == WhiteKing) { - for (ft = BOARD_LEFT+0; ft < BOARD_RGHT; ft++) { - if (board[0][ft] == WhiteRook) { - callback(board, flags, - (ft > ff) ? WhiteHSideCastleFR : WhiteASideCastleFR, - 0, ff, 0, ft, closure); - } - } - } - } - - } else { - - for (ff = BOARD_LEFT+1; ff < BOARD_RGHT-1; ff++) { - if (board[BOARD_HEIGHT-1][ff] == BlackKing) { - for (ft = BOARD_LEFT+0; ft < BOARD_RGHT; ft++) { - if (board[BOARD_HEIGHT-1][ft] == BlackRook) { - callback(board, flags, - (ft > ff) ? BlackHSideCastleFR : BlackASideCastleFR, - BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ft, closure); - } - } - } - } - } - - /* POP Fabien */ - - 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) { - 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; - - cl.rf = rf; - cl.ff = ff; - cl.rt = rt; - cl.ft = ft; - cl.kind = IllegalMove; - GenLegal(board, flags, epfile, castlingRights, LegalityTestCallback, (VOIDSTAR) &cl); - 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; - } - } - 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 ? - 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]) && - (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; - closure->count = 0; - closure->rf = closure->ff = closure->rt = closure->ft = 0; - closure->kind = ImpossibleMove; - 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 */ - return; - } - } - 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; - } - } - closure->promoChar = ToLower(PieceToChar(PromoPiece(closure->kind))); - 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; - } -} - - -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) { - 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; - 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; - AlphaRank(out, 5); - return (flags & F_WHITE_ON_MOVE) ? WhiteDrop : BlackDrop; - } - - if (promoChar == 'x') promoChar = NULLCHAR; - piece = board[rf][ff]; - 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" */ - if (promoChar != NULLCHAR && promoChar != 'x') { - *outp++ = '='; - *outp++ = ToUpper(promoChar); - } - *outp = NULLCHAR; - AlphaRank(out, 10); - 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". - */ - *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; - AlphaRank(out, 10); - return cl.kind; - -#ifdef FAIRY - /* [HGM] Always long notation for fairies, don't know how they move */ - case WhiteNightrider: - case BlackNightrider: - case WhiteGrasshopper: - case BlackGrasshopper: -#endif - 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; - - AlphaRank(out, 0); - 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 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 +#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); + +extern signed char initialRights[BOARD_SIZE]; /* [HGM] all rights enabled, set in InitPosition */ + + +int WhitePiece(piece) + ChessSquare piece; +{ + return (int) piece >= (int) WhitePawn && (int) piece < (int) 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; + case WhitePromotionChancellor: + return WhiteMarshall; + case BlackPromotionChancellor: + return BlackMarshall; + case WhitePromotionArchbishop: + return WhiteAngel; + case BlackPromotionArchbishop: + return BlackAngel; + case WhitePromotionCentaur: + return WhiteSilver; + case BlackPromotionCentaur: + return BlackSilver; + } +} + +char pieceToChar[] = { + 'P', 'N', 'B', 'R', 'Q', 'F', 'E', 'A', 'C', 'W', 'M', + 'O', 'H', 'I', 'J', 'G', 'D', 'V', 'L', 'S', 'U', 'K', + 'p', 'n', 'b', 'r', 'q', 'f', 'e', 'a', 'c', 'w', 'm', + 'o', 'h', 'i', 'j', 'g', 'd', 'v', 'l', 's', 'u', 'k', + 'x' }; + +char PieceToChar(p) + ChessSquare p; +{ + if((int)p < 0 || (int)p >= (int)EmptySquare) return('x'); /* [HGM] for safety */ + return pieceToChar[(int) p]; +} + +int PieceToNumber(p) /* [HGM] holdings: count piece type, ignoring non-participating piece types */ + ChessSquare p; +{ + int i=0; + ChessSquare start = (int)p >= (int)BlackPawn ? BlackPawn : WhitePawn; + + while(start++ != p) if(pieceToChar[(int)start-1] != '.') i++; + return i; +} + +ChessSquare CharToPiece(c) + int c; +{ + int i; + for(i=0; i< (int) EmptySquare; i++) + if(pieceToChar[i] == c) return (ChessSquare) i; + return EmptySquare; +} + +ChessMove PromoCharToMoveType(whiteOnMove, promoChar) + int whiteOnMove; + int promoChar; +{ /* [HGM] made dependent on CharToPiece to alow alternate piece letters */ + ChessSquare piece = CharToPiece(whiteOnMove ? ToUpper(promoChar) : ToLower(promoChar) ); + + + if(promoChar == NULLCHAR) return NormalMove; + + switch(piece) { + case WhiteQueen: + return WhitePromotionQueen; + case WhiteRook: + return WhitePromotionRook; + case WhiteBishop: + return WhitePromotionBishop; + case WhiteKnight: + return WhitePromotionKnight; + case WhiteKing: + return WhitePromotionKing; + case WhiteAngel: + return WhitePromotionArchbishop; + case WhiteMarshall: + return WhitePromotionChancellor; + case WhiteSilver: + return WhitePromotionCentaur; + case BlackQueen: + return BlackPromotionQueen; + case BlackRook: + return BlackPromotionRook; + case BlackBishop: + return BlackPromotionBishop; + case BlackKnight: + return BlackPromotionKnight; + case BlackKing: + return BlackPromotionKing; + case BlackAngel: + return BlackPromotionArchbishop; + case BlackMarshall: + return BlackPromotionChancellor; + case BlackSilver: + return BlackPromotionCentaur; + default: + // not all promotion implemented yet! Take Queen for those we don't know. + return (whiteOnMove ? WhitePromotionQueen : BlackPromotionQueen); + } +} + +void CopyBoard(to, from) + 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 finishSilver; + 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 WhiteSilver: + case BlackSilver: + m++; // [HGM] superchess: use for Centaur + case WhiteMan: + case BlackMan: + case SHOGI WhiteKing: + case SHOGI BlackKing: + case WhiteKing: + case BlackKing: +// walking: + for (i = -1; i <= 1; i++) + for (j = -1; j <= 1; j++) { + if (i == 0 && j == 0) continue; + rt = rf + i; + ft = ff + j; + if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) continue; + if (SameColor(board[rf][ff], board[rt][ft])) continue; + callback(board, flags, NormalMove, + rf, ff, rt, ft, closure); + } + if(m==1) goto mounted; + break; + + case WhiteNightrider: + case BlackNightrider: + for (i = -1; i <= 1; i += 2) + for (j = -1; j <= 1; j += 2) + for (s = 1; s <= 2; s++) { int k; + for(k=1;; k++) { + rt = rf + k*i*s; + ft = ff + k*j*(3-s); + if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) break; + if (SameColor(board[rf][ff], board[rt][ft])) break; + callback(board, flags, NormalMove, + rf, ff, rt, ft, closure); + if (board[rt][ft] != EmptySquare) break; + } + } + break; + case WhiteFalcon: // [HGM] wild: for wildcards, self-capture symbolizes move to anywhere + case BlackFalcon: + case WhiteCobra: + case BlackCobra: + case WhiteLance: + case BlackLance: + callback(board, flags, NormalMove, rf, ff, rf, ff, closure); + break; + + } + } +} + + +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; + 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, 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.fking < BOARD_RGHT ? cl.check : 1000; // [HGM] atomic: return 1000 if we have no king +} + + +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(board[rt][ft] != EmptySquare || kind==WhiteCapturesEnPassant || kind==BlackCapturesEnPassant) + cl->captures++; // [HGM] losers: count legal captures + if (rf == cl->rf && ff == cl->ff && rt == cl->rt && ft == cl->ft) + cl->kind = kind; +} + +ChessMove LegalityTest(board, flags, epfile, 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 CheckTest(board, flags, rf, ff, rt, ft, FALSE) ? IllegalMove : NormalMove; + + cl.rf = rf; + cl.ff = ff; + cl.rt = rt; + cl.ft = ft; + cl.kind = IllegalMove; + cl.captures = 0; // [HGM] losers: prepare to count legal captures. + GenLegal(board, flags, epfile, castlingRights, LegalityTestCallback, (VOIDSTAR) &cl); + if((flags & F_MANDATORY_CAPTURE) && cl.captures && board[rt][ft] == EmptySquare + && cl.kind != WhiteCapturesEnPassant && cl.kind != BlackCapturesEnPassant) + return(IllegalMove); // [HGM] losers: if there are legal captures, non-capts are illegal + + if(gameInfo.variant == VariantShogi) { + /* [HGM] Shogi promotions. '=' means defer */ + if(rf != DROP_RANK && cl.kind == NormalMove) { + ChessSquare piece = board[rf][ff]; + + if(promoChar == PieceToChar(BlackQueen)) promoChar = NULLCHAR; /* [HGM] Kludge */ + if(promoChar != NULLCHAR && promoChar != 'x' && + promoChar != '+' && promoChar != '=' && + ToUpper(PieceToChar(PROMOTED piece)) != ToUpper(promoChar) ) + cl.kind = IllegalMove; + else if(flags & F_WHITE_ON_MOVE) { + if( (int) piece < (int) WhiteWazir && + (rf > BOARD_HEIGHT-4 || rt > BOARD_HEIGHT-4) ) { + if( (piece == WhitePawn || piece == WhiteQueen) && rt > BOARD_HEIGHT-2 || + piece == WhiteKnight && rt > BOARD_HEIGHT-3) /* promotion mandatory */ + cl.kind = promoChar == '=' ? IllegalMove : WhitePromotionKnight; + else /* promotion optional, default is promote */ + cl.kind = promoChar == '=' ? NormalMove : WhitePromotionQueen; + + } else cl.kind = (promoChar == NULLCHAR || promoChar == 'x' || promoChar == '=') ? + NormalMove : IllegalMove; + } else { + if( (int) piece < (int) BlackWazir && (rf < 3 || rt < 3) ) { + if( (piece == BlackPawn || piece == BlackQueen) && rt < 1 || + piece == BlackKnight && rt < 2 ) /* promotion obligatory */ + cl.kind = promoChar == '=' ? IllegalMove : BlackPromotionKnight; + else /* promotion optional, default is promote */ + cl.kind = promoChar == '=' ? NormalMove : BlackPromotionQueen; + + } else cl.kind = (promoChar == NULLCHAR || promoChar == 'x' || promoChar == '=') ? + NormalMove : IllegalMove; + } + } + } else + if (promoChar != NULLCHAR && promoChar != 'x') { + if(promoChar == '=') cl.kind = IllegalMove; else // [HGM] shogi: no deferred promotion outside Shogi + if (cl.kind == WhitePromotionQueen || cl.kind == BlackPromotionQueen) { + cl.kind = + PromoCharToMoveType((flags & F_WHITE_ON_MOVE) != 0, promoChar); + } 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, 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++; + } + } + if(appData.debugMode) fprintf(debugFP, "MateTest: K=%d, my=%d, his=%d\n", nrKing, myPieces, hisPieces); + switch(gameInfo.variant) { // [HGM] losers: extinction wins + case VariantShatranj: + if(hisPieces == 1) return myPieces > 1 ? MT_BARE : MT_DRAW; + default: + break; + case VariantAtomic: + if(nrKing == 0) return MT_NOKING; + break; + case VariantLosers: + if(myPieces == 1) return MT_BARE; + } + cl.count = 0; + inCheck = GenLegal(board, flags, epfile, castlingRights, MateTestCallback, (VOIDSTAR) &cl); + // [HGM] 3check: yet to do! + if (cl.count > 0) { + return inCheck ? MT_CHECK : MT_NONE; + } else { + if(gameInfo.variant == VariantSuicide) // [HGM] losers: always stalemate, since no check, but result varies + return myPieces == hisPieces ? MT_STALEMATE : + myPieces > hisPieces ? MT_STAINMATE : MT_STEALMATE; + else if(gameInfo.variant == VariantLosers) return inCheck ? MT_TRICKMATE : MT_STEALMATE; + else if(gameInfo.variant == VariantGiveaway) return MT_STEALMATE; // no check exists, stalemated = win + + return inCheck ? MT_CHECKMATE + : (gameInfo.variant == VariantXiangqi || gameInfo.variant == VariantShatranj) ? + MT_STAINMATE : MT_STALEMATE; + } +} + + +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; + int wildCard = FALSE; ChessSquare piece = board[rf][ff]; + + // [HGM] wild: for wild-card pieces rt and rf are dummies + if(piece == WhiteFalcon || piece == BlackFalcon || + piece == WhiteCobra || piece == BlackCobra || + piece == WhiteLance || piece == BlackLance) + wildCard = TRUE; + + if ((cl->pieceIn == EmptySquare || cl->pieceIn == board[rf][ff] + || PieceToChar(board[rf][ff]) == '~' + && cl->pieceIn == (ChessSquare)(DEMOTED board[rf][ff]) + ) && + (cl->rfIn == -1 || cl->rfIn == rf) && + (cl->ffIn == -1 || cl->ffIn == ff) && + (cl->rtIn == -1 || cl->rtIn == rt || wildCard) && + (cl->ftIn == -1 || cl->ftIn == ft || wildCard)) { + + cl->count++; + 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; + } +} + +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( (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; + } + } + /* [HGM] returns 'q' for optional promotion, 'n' for mandatory */ + if(closure->promoCharIn != '=') + closure->promoChar = ToLower(closure->promoCharIn); + else closure->promoChar = '='; + if (closure->promoChar == 'x') closure->promoChar = NULLCHAR; + if (closure->count > 1) { + closure->kind = AmbiguousMove; + } + 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 = ToLower(closure->promoCharIn); + if (appData.debugMode) { + fprintf(debugFP, "Disambiguate out: %d(%d,%d)-(%d,%d) = %d (%c)\n", + closure->piece,closure->ff,closure->rf,closure->ft,closure->rt,closure->promoChar, + closure->promoChar >= ' ' ? closure->promoChar:'-'); + } +} + + +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 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; +} + +// [HGM] XQ: the following code serves to detect perpetual chasing (Asian rules) + +typedef struct { + /* Input */ + int rf, ff, rt, ft; + /* Output */ + int recaptures; +} ChaseClosure; + +// I guess the following variables logically belong in the closure too, but I was too lazy and used globals + +int preyStackPointer, chaseStackPointer; + +struct { +char rf, ff, rt, ft; +} chaseStack[100]; + +struct { +char rank, file; +} preyStack[100]; + + + + +// there are three new callbacks for use with GenLegal: for adding captures, deleting them, and finding a recapture + +extern void AtacksCallback P((Board board, int flags, ChessMove kind, + int rf, int ff, int rt, int ft, + VOIDSTAR closure)); + +void AttacksCallback(board, flags, kind, rf, ff, rt, ft, closure) + Board board; + int flags; + ChessMove kind; + int rf, ff, rt, ft; + VOIDSTAR closure; +{ // For adding captures that can lead to chase indictment to the chaseStack + if(board[rt][ft] == EmptySquare) return; // non-capture + if(board[rt][ft] == WhitePawn && rt < BOARD_HEIGHT/2) return; // Pawn before river can be chased + if(board[rt][ft] == BlackPawn && rt >= BOARD_HEIGHT/2) return; // Pawn before river can be chased + if(board[rf][ff] == WhitePawn || board[rf][ff] == BlackPawn) return; // Pawns are allowed to chase + if(board[rf][ff] == WhiteWazir || board[rf][ff] == BlackWazir) return; // King is allowed to chase + // move cannot be excluded from being a chase trivially (based on attacker and victim); save it on chaseStack + chaseStack[chaseStackPointer].rf = rf; + chaseStack[chaseStackPointer].ff = ff; + chaseStack[chaseStackPointer].rt = rt; + chaseStack[chaseStackPointer].ft = ft; + chaseStackPointer++; +} + +extern void ExistingAtacksCallback P((Board board, int flags, ChessMove kind, + int rf, int ff, int rt, int ft, + VOIDSTAR closure)); + +void ExistingAttacksCallback(board, flags, kind, rf, ff, rt, ft, closure) + Board board; + int flags; + ChessMove kind; + int rf, ff, rt, ft; + VOIDSTAR closure; +{ // for removing pre-exsting captures from the chaseStack, to be left with newly created ones + int i; + register ChaseClosure *cl = (ChaseClosure *) closure; //closure tells us the move played in the repeat loop + + if(board[rt][ft] == EmptySquare) return; // no capture + if(rf == cl->rf && ff == cl->ff) { // attacks with same piece from new position are not considered new + rf = cl->rt; ff = cl->ft; // doctor their fromSquare so they will be recognized in chaseStack + } + // search move in chaseStack, and delete it if it occurred there (as we know now it is not a new capture) + for(i=0; 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), EP_NONE, initialRights, chaseStack[j].rt, + chaseStack[j].ft, chaseStack[j].rf, chaseStack[j].ff, NULLCHAR) == NormalMove) { + // we can capture back with equal piece, so this is no chase but a sacrifice + chaseStack[j] = chaseStack[--chaseStackPointer]; // delete the capture from the chaseStack + j--; /* ! */ continue; + } + + } + + // the attack is on a lower piece, or on a pinned or blocked equal one + // test if the victim is protected by a true protector. First make the capture. + captured = boards[i+1][chaseStack[j].rt][chaseStack[j].ft]; + boards[i+1][chaseStack[j].rt][chaseStack[j].ft] = boards[i+1][chaseStack[j].rf][chaseStack[j].ff]; + boards[i+1][chaseStack[j].rf][chaseStack[j].ff] = EmptySquare; + // Then test if the opponent can recapture + cl.recaptures = 0; // prepare closure to pass recapture square and count moves to it + cl.rt = chaseStack[j].rt; + cl.ft = chaseStack[j].ft; + if(appData.debugMode) { + fprintf(debugFP, "test if we can recapture %c%c\n", cl.ft+AAA, cl.rt+ONE); + } + GenLegal(boards[i+1], PosFlags(i+1), EP_NONE, initialRights, ProtectedCallback, &cl); // try all moves + // unmake the capture + boards[i+1][chaseStack[j].rf][chaseStack[j].ff] = boards[i+1][chaseStack[j].rt][chaseStack[j].ft]; + boards[i+1][chaseStack[j].rt][chaseStack[j].ft] = captured; + // if a recapture was found, piece is protected, and we are not chasing it. + if(cl.recaptures) { // attacked piece was defended by true protector, no chase + chaseStack[j] = chaseStack[--chaseStackPointer]; // so delete from chaseStack + j--; /* ! */ + } + } + // chaseStack now contains all moves that chased + if(appData.debugMode) { int n; + for(n=0; n