/*
* 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
- * 1992-2001,2002,2003,2004,2005,2006,2007,2008,2009 Free Software
- * Foundation, Inc.
+ * 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:
int WhitePiece P((ChessSquare));
int BlackPiece P((ChessSquare));
int SameColor P((ChessSquare, ChessSquare));
+int PosFlags(int index);
-extern char initialRights[BOARD_SIZE]; /* [HGM] all rights enabled, set in InitPosition */
+extern signed char initialRights[BOARD_SIZE]; /* [HGM] all rights enabled, set in InitPosition */
int WhitePiece(piece)
char pieceToChar[] = {
'P', 'N', 'B', 'R', 'Q', 'F', 'E', 'A', 'C', 'W', 'M',
- 'O', 'H', 'I', 'J', 'G', 'D', 'V', 'L', 's', 'U', 'K',
+ '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' };
if (board[rt][ft] != EmptySquare) break;
}
if(m==1) goto mounted;
- if(m==2) goto finishGold;
+ if(m==2) goto finishSilver;
break;
case WhiteQueen:
case SHOGI BlackKing:
case WhiteKing:
case BlackKing:
- walking:
+// walking:
for (i = -1; i <= 1; i++)
for (j = -1; j <= 1; j++) {
if (i == 0 && j == 0) continue;
typedef struct {
int rf, ff, rt, ft;
ChessMove kind;
+ int captures; // [HGM] losers
} LegalityTestClosure;
}
}
- return cl.check;
+ return cl.fking < BOARD_RGHT ? cl.check : 1000; // [HGM] atomic: return 1000 if we have no king
}
// 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;
}
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 */
char castlingRights[];
{
MateTestClosure cl;
- int inCheck;
+ int inCheck, r, f, myPieces=0, hisPieces=0, nrKing=0;
+ ChessSquare king = flags & F_WHITE_ON_MOVE ? WhiteKing : BlackKing;
+ for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) {
+ // [HGM] losers: Count pieces and kings, to detect other unorthodox winning conditions
+ nrKing += (board[r][f] == king); // stm has king
+ if( board[r][f] != EmptySquare ) {
+ if((int)board[r][f] <= (int)king && (int)board[r][f] >= (int)king - (int)WhiteKing + (int)WhitePawn)
+ myPieces++;
+ else hisPieces++;
+ }
+ }
+ if(appData.debugMode) fprintf(debugFP, "MateTest: K=%d, my=%d, his=%d\n", nrKing, myPieces, hisPieces);
+ switch(gameInfo.variant) { // [HGM] losers: extinction wins
+ case VariantShatranj:
+ if(hisPieces == 1) return myPieces > 1 ? MT_BARE : MT_DRAW;
+ default:
+ break;
+ case VariantAtomic:
+ if(nrKing == 0) return MT_NOKING;
+ break;
+ case VariantLosers:
+ if(myPieces == 1) return MT_BARE;
+ }
cl.count = 0;
inCheck = GenLegal(board, flags, epfile, castlingRights, MateTestCallback, (VOIDSTAR) &cl);
+ // [HGM] 3check: yet to do!
if (cl.count > 0) {
return inCheck ? MT_CHECK : MT_NONE;
} else {
- return inCheck || gameInfo.variant == VariantXiangqi || gameInfo.variant == VariantShatranj ?
- MT_CHECKMATE : MT_STALEMATE;
+ if(gameInfo.variant == VariantSuicide) // [HGM] losers: always stalemate, since no check, but result varies
+ return myPieces == hisPieces ? MT_STALEMATE :
+ myPieces > hisPieces ? MT_STAINMATE : MT_STEALMATE;
+ else if(gameInfo.variant == VariantLosers) return inCheck ? MT_TRICKMATE : MT_STEALMATE;
+ else if(gameInfo.variant == VariantGiveaway) return MT_STEALMATE; // no check exists, stalemated = win
+
+ return inCheck ? MT_CHECKMATE
+ : (gameInfo.variant == VariantXiangqi || gameInfo.variant == VariantShatranj) ?
+ MT_STAINMATE : MT_STALEMATE;
}
}
int rf, ff, rt, ft;
VOIDSTAR closure;
{ // for determining if a piece (given through the closure) is protected
- register ChaseClosure *cl = (ChaseClosure *) closure; // closure tells us where to recapture
-
- if(rt == cl->rt && ft == cl->ft) cl->recaptures++; // count legal recaptures to this square
- if(appData.debugMode && board[rt][ft] != EmptySquare)
- fprintf(debugFP, "try %c%c%c%c=%d\n", ff+AAA, rf+ONE,ft+AAA, rt+ONE, cl->recaptures);
+ register ChaseClosure *cl = (ChaseClosure *) closure; // closure tells us where to recapture
+
+ if(rt == cl->rt && ft == cl->ft) cl->recaptures++; // count legal recaptures to this square
+ if(appData.debugMode && board[rt][ft] != EmptySquare)
+ fprintf(debugFP, "try %c%c%c%c=%d\n", ff+AAA, rf+ONE,ft+AAA, rt+ONE, cl->recaptures);
}
extern char moveList[MAX_MOVES][MOVE_LEN];
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) { int n;
+ 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
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