* Massachusetts.
*
* Enhancements Copyright 1992-2001, 2002, 2003, 2004, 2005, 2006,
- * 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+ * 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
*
* Enhancements Copyright 2005 Alessandro Scotti
*
} GenLegalClosure;
int rFilter, fFilter; // [HGM] speed: sorry, but I get a bit tired of this closure madness
+Board xqCheckers, nullBoard;
extern void GenLegalCallback P((Board board, int flags, ChessMove kind,
int rf, int ff, int rt, int ft,
if (!(flags & F_IGNORE_CHECK) ) {
int check, promo = (gameInfo.variant == VariantSpartan && kind == BlackPromotion);
- if(promo) board[rf][ff] = BlackKing; // [HGM] spartan: promote to King before check-test
+ if(promo) {
+ int r, f, kings=0;
+ for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++)
+ kings += (board[r][f] == BlackKing);
+ if(kings >= 2)
+ promo = 0;
+ else
+ board[rf][ff] = BlackKing; // [HGM] spartan: promote to King before check-test
+ }
check = CheckTest(board, flags, rf, ff, rt, ft,
kind == WhiteCapturesEnPassant ||
kind == BlackCapturesEnPassant);
int ff, ft, k, left, right, swap;
int ignoreCheck = (flags & F_IGNORE_CHECK) != 0;
ChessSquare wKing = WhiteKing, bKing = BlackKing, *castlingRights = board[CASTLING];
+ int inCheck = !ignoreCheck && CheckTest(board, flags, -1, -1, -1, -1, FALSE); // kludge alert: this would mark pre-existing checkers if status==1
cl.cb = callback;
cl.cl = closure;
+ xqCheckers[EP_STATUS] *= 2; // quasi: if previous CheckTest has been marking, we now set flag for suspending same checkers
if(filter == EmptySquare) rFilter = fFilter = -1; // [HGM] speed: do not filter on square if we do not filter on piece
GenPseudoLegal(board, flags, GenLegalCallback, (VOIDSTAR) &cl, filter);
- if (!ignoreCheck &&
- CheckTest(board, flags, -1, -1, -1, -1, FALSE)) return TRUE;
+ if (inCheck) return TRUE;
/* Generate castling moves */
if(gameInfo.variant == VariantKnightmate) { /* [HGM] Knightmate */
{
register CheckTestClosure *cl = (CheckTestClosure *) closure;
- if (rt == cl->rking && ft == cl->fking) cl->check++;
+ if (rt == cl->rking && ft == cl->fking) {
+ if(xqCheckers[EP_STATUS] >= 2 && xqCheckers[rf][ff]) return; // checker is piece with suspended checking power
+ cl->check++;
+ xqCheckers[rf][ff] = xqCheckers[EP_STATUS] & 1; // remember who is checking (if status == 1)
+ }
}
if(gameInfo.variant == VariantKnightmate)
king = flags & F_WHITE_ON_MOVE ? WhiteUnicorn : BlackUnicorn;
- if (rf >= 0) {
+ if (rt >= 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;
- } else board[rt][ft] = ff; // [HGM] drop
+ if(rf == DROP_RANK) board[rt][ft] = ff; else { // [HGM] drop
+ 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,
undo_move:
- if (rf >= 0) {
- board[rf][ff] = board[rt][ft];
+ if (rt >= 0) {
+ if(rf != DROP_RANK) // [HGM] drop
+ board[rf][ff] = board[rt][ft];
if (enPassant) {
board[rf][ft] = captured;
board[rt][ft] = EmptySquare;
} else {
board[rt][ft] = captured;
}
- } else board[rt][ft] = EmptySquare; // [HGM] drop
+ }
return cl.fking < BOARD_RGHT ? cl.check : 1000; // [HGM] atomic: return 1000 if we have no king
}
return inCheck ? MT_CHECK : MT_NONE;
} else {
if(gameInfo.holdingsWidth && gameInfo.variant != VariantSuper && gameInfo.variant != VariantGreat
- && gameInfo.variant != VariantGrand) { // drop game
+ && gameInfo.variant != VariantSChess && gameInfo.variant != VariantGrand) { // drop game
int r, f, n, holdings = flags & F_WHITE_ON_MOVE ? BOARD_WIDTH-1 : 0;
for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) if(board[r][f] == EmptySquare) // all empty squares
for(n=0; n<BOARD_HEIGHT; n++) // all pieces in hand
cl.ff = moveList[i][0]-AAA+BOARD_LEFT;
cl.rt = moveList[i][3]-ONE;
cl.ft = moveList[i][2]-AAA+BOARD_LEFT;
+ CopyBoard(xqCheckers, nullBoard); xqCheckers[EP_STATUS] = 1; // giant kludge to make GenLegal ignore pre-existing checks
GenLegal(boards[i], PosFlags(i), ExistingAttacksCallback, &cl, EmptySquare);
+ xqCheckers[EP_STATUS] = 0; // disable the generation of quasi-legal moves again
if(appData.debugMode) { int n;
for(n=0; n<chaseStackPointer; n++)
fprintf(debugFP, "%c%c%c%c ", chaseStack[n].ff+AAA, chaseStack[n].rf+ONE,
}
// the attack is on a lower piece, or on a pinned or blocked equal one
+ CopyBoard(xqCheckers, nullBoard); xqCheckers[EP_STATUS] = 1;
+ CheckTest(boards[i+1], PosFlags(i+1), -1, -1, -1, -1, FALSE); // if we deliver check with our move, the checkers get marked
// test if the victim is protected by a true protector. First make the capture.
captured = boards[i+1][chaseStack[j].rt][chaseStack[j].ft];
boards[i+1][chaseStack[j].rt][chaseStack[j].ft] = boards[i+1][chaseStack[j].rf][chaseStack[j].ff];
if(appData.debugMode) {
fprintf(debugFP, "test if we can recapture %c%c\n", cl.ft+AAA, cl.rt+ONE);
}
+ xqCheckers[EP_STATUS] = 2; // causes GenLegal to ignore the checks we delivered with the move, in real life evaded before we captured
GenLegal(boards[i+1], PosFlags(i+1), ProtectedCallback, &cl, EmptySquare); // try all moves
+ xqCheckers[EP_STATUS] = 0; // disable quasi-legal moves again
// unmake the capture
boards[i+1][chaseStack[j].rf][chaseStack[j].ff] = boards[i+1][chaseStack[j].rt][chaseStack[j].ft];
boards[i+1][chaseStack[j].rt][chaseStack[j].ft] = captured;
}
}
}
- return preyStackPointer; // if any piece was left on preyStack, it has been perpetually chased
+ return preyStackPointer ? 256*(preyStack[preyStackPointer].file - BOARD_LEFT + AAA) + (preyStack[preyStackPointer].rank + ONE)
+ : 0; // if any piece was left on preyStack, it has been perpetually chased,and we return the
}
projects / xboard.git / blobdiff