return flags;
}
- // can color1 take color2?
- canTake(color1, color2)
+ canTake([x1,y1], [x2,y2])
{
+ const color1 = this.getColor(x1,y1);
+ const color2 = this.getColor(x2,y2);
// Checkered aren't captured
return color1 != color2 && color2 != 'c' && (color1 != 'c' || color2 != this.turn);
}
- // Build regular move(s) from its initial and destination squares; tr: transformation
- getBasicMove(sx, sy, ex, ey, tr)
+ addCaptures([sx,sy], [ex,ey], moves)
{
- if (this.board[ex][ey] == VariantRules.EMPTY)
+ const piece = this.getPiece(sx,sy);
+ if (piece != VariantRules.KING)
{
- // No capture, standard move construction
- return [super.getBasicMove(sx,sy,ex,ey,tr)];
+ moves.push(this.getBasicMove([sx,sy], [ex,ey], {c:'c',p:piece}));
+ const takePiece = this.getPiece(ex,ey);
+ if (takePiece != piece)
+ moves.push(this.getBasicMove([sx,sy], [ex,ey], {c:'c',p:takePiece}));
}
- let moves = []; //captures: generally 2 choices, unless 'tr' is specified or piece==king
- const startPiece = this.getPiece(sx,sy);
- const endPiece = this.getPiece(ex,ey);
- const startColor = this.getColor(sx,sy);
- const endColor = this.getColor(ex,ey);
- for (let piece of !!tr ? [tr] :
- (startPiece==VariantRules.KING ? VariantRules.KING : _.uniq([startPiece,endPiece])))
- {
- var mv = new Move({
- appear: [
- new PiPo({
- x: ex,
- y: ey,
- c: startPiece==VariantRules.KING ? startColor : 'c',
- p: piece
- })
- ],
- vanish: [
- new PiPo({
- x: sx,
- y: sy,
- c: startColor,
- p: startPiece
- }),
- new PiPo({
- x: ex,
- y: ey,
- c: endColor,
- p: endPiece
- })
- ]
- });
- moves.push(mv);
- }
- return moves;
+ else
+ moves.push(this.getBasicMove([sx,sy], [ex,ey]));
}
// Generic method to find possible moves of non-pawn pieces ("sliding or jumping")
- getSlideNJumpMoves(x, y, color, steps, oneStep)
+ getSlideNJumpMoves([x,y], steps, oneStep)
{
- var moves = [];
- let [sizeX,sizeY] = VariantRules.size;
+ const color = this.getColor(x,y);
+ let moves = [];
+ const [sizeX,sizeY] = VariantRules.size;
outerLoop:
for (var loop=0; loop<steps.length; loop++)
{
- var step = steps[loop];
- var i = x + step[0];
- var j = y + step[1];
- while (i>=0 && i<sizeX && j>=0 && j<sizeY
- && this.board[i][j] == VariantRules.EMPTY)
+ let step = steps[loop];
+ let i = x + step[0];
+ let j = y + step[1];
+ while (i>=0 && i<sizeX && j>=0 && j<sizeY && this.board[i][j] == VariantRules.EMPTY)
{
- moves.push(this.getBasicMove(x, y, i, j)[0]); //no capture
+ moves.push(this.getBasicMove([x,y], [i,j])); //no capture
if (oneStep !== undefined)
continue outerLoop;
i += step[0];
j += step[1];
}
- if (i>=0 && i<8 && j>=0 && j<8 && this.canTake(color, this.getColor(i,j)))
- moves = moves.concat(this.getBasicMove(x, y, i, j));
+ if (i>=0 && i<8 && j>=0 && j<8 && this.canTake([x,y], [i,j]))
+ this.addCaptures([x,y], [i,j], moves);
}
return moves;
}
// What are the pawn moves from square x,y considering color "color" ?
- getPotentialPawnMoves(x, y, color)
+ getPotentialPawnMoves([x,y])
{
+ const color = this.getColor(x,y);
var moves = [];
var V = VariantRules;
let [sizeX,sizeY] = VariantRules.size;
// Normal moves
if (this.board[x+shift][y] == V.EMPTY)
{
- moves.push(this.getBasicMove(x, y, x+shift, y)[0]);
+ moves.push(this.getBasicMove([x,y], [x+shift,y]));
if (x==startRank && this.board[x+2*shift][y] == V.EMPTY && this.flags[1][c][y])
{
// Two squares jump
- moves.push(this.getBasicMove(x, y, x+2*shift, y)[0]);
+ moves.push(this.getBasicMove([x,y], [x+2*shift,y]));
}
}
// Captures
- if (y>0 && this.canTake(this.getColor(x,y), this.getColor(x+shift,y-1))
- && this.board[x+shift][y-1] != V.EMPTY)
- {
- moves = moves.concat(this.getBasicMove(x, y, x+shift, y-1));
- }
- if (y<sizeY-1 && this.canTake(this.getColor(x,y), this.getColor(x+shift,y+1))
- && this.board[x+shift][y+1] != V.EMPTY)
- {
- moves = moves.concat(this.getBasicMove(x, y, x+shift, y+1));
- }
+ if (y>0 && this.canTake([x,y], [x+shift,y-1]) && this.board[x+shift][y-1] != V.EMPTY)
+ this.addCaptures([x,y], [x+shift,y-1], moves);
+ if (y<sizeY-1 && this.canTake([x,y], [x+shift,y+1]) && this.board[x+shift][y+1] != V.EMPTY)
+ this.addCaptures([x,y], [x+shift,y+1], moves);
}
if (x+shift == lastRank)
promotionPieces.forEach(p => {
// Normal move
if (this.board[x+shift][y] == V.EMPTY)
- moves.push(this.getBasicMove(x, y, x+shift, y, p)[0]);
+ moves.push(this.getBasicMove([x,y], [x+shift,y], {c:color,p:p}));
// Captures
- if (y>0 && this.canTake(this.getColor(x,y), this.getColor(x+shift,y-1))
- && this.board[x+shift][y-1] != V.EMPTY)
- {
- moves = moves.concat(this.getBasicMove(x, y, x+shift, y-1, p));
- }
- if (y<sizeY-1 && this.canTake(this.getColor(x,y), this.getColor(x+shift,y+1))
- && this.board[x+shift][y+1] != V.EMPTY)
- {
- moves = moves.concat(this.getBasicMove(x, y, x+shift, y+1, p));
- }
+ if (y>0 && this.canTake([x,y], [x+shift,y-1]) && this.board[x+shift][y-1] != V.EMPTY)
+ moves.push(this.getBasicMove([x,y], [x+shift,y-1], {c:'c',p:p}));
+ if (y<sizeY-1 && this.canTake([x,y], [x+shift,y+1]) && this.board[x+shift][y+1] != V.EMPTY)
+ moves.push(this.getBasicMove([x,y], [x+shift,y+1], {c:'c',p:p}));
});
}
if (!!epSquare && epSquare.x == x+shift && Math.abs(epSquare.y - y) == 1)
{
let epStep = epSquare.y - y;
- var enpassantMove = this.getBasicMove(x, y, x+shift, y+epStep)[0];
+ var enpassantMove = this.getBasicMove([x,y], [x+shift,y+epStep]);
enpassantMove.vanish.push({
x: x,
y: y+epStep,
return moves;
}
- getCastleMoves(x,y,c)
+ getCastleMoves([x,y])
{
+ const c = this.getColor(x,y);
if (x != (c=="w" ? 7 : 0) || y != this.INIT_COL_KING[c])
return []; //x isn't first rank, or king has moved (shortcut)
return moves;
}
- canIplay(color, sq)
+ canIplay(side, [x,y])
{
- return ((color=='w' && this.moves.length%2==0) || color=='c'
- || (color=='b' && this.moves.length%2==1))
- && [color,'c'].includes(this.getColor(sq[0], sq[1]));
+ return ((side=='w' && this.moves.length%2==0) || (side=='b' && this.moves.length%2==1))
+ && [side,'c'].includes(this.getColor(x,y));
}
// Does m2 un-do m1 ? (to disallow undoing checkered moves)
{
return m1.appear.length == 1 && m2.appear.length == 1
&& m1.vanish.length == 1 && m2.vanish.length == 1
-// && _.isEqual(m1.appear[0], m2.vanish[0]) //fails in HH case
-// && _.isEqual(m1.vanish[0], m2.appear[0]);
&& m1.start.x == m2.end.x && m1.end.x == m2.start.x
&& m1.start.y == m2.end.y && m1.end.y == m2.start.y
&& m1.appear[0].c == m2.vanish[0].c && m1.appear[0].p == m2.vanish[0].p
{
if (moves.length == 0)
return [];
- let color = this.getColor( moves[0].start.x, moves[0].start.y );
+ const color = this.turn;
return moves.filter(m => {
const L = this.moves.length;
if (L > 0 && this.oppositeMoves(this.moves[L-1], m))
return false;
- return !this.underCheck(m, color);
+ return !this.underCheck(m);
});
}
- isAttackedByPawn([x,y], c)
- {
- const color = (c=="c" ? this.turn : c);
- let pawnShift = (color=="w" ? 1 : -1);
- if (x+pawnShift>=0 && x+pawnShift<8)
- {
- for (let i of [-1,1])
- {
- if (y+i>=0 && y+i<8 && this.getPiece(x+pawnShift,y+i)==VariantRules.PAWN
- && this.getColor(x+pawnShift,y+i)==c)
- {
- return true;
- }
- }
- }
- return false;
- }
-
- underCheck(move, c)
+ isAttackedByPawn([x,y], colors)
+ {
+ for (let c of colors)
+ {
+ const color = (c=="c" ? this.turn : c);
+ let pawnShift = (color=="w" ? 1 : -1);
+ if (x+pawnShift>=0 && x+pawnShift<8)
+ {
+ for (let i of [-1,1])
+ {
+ if (y+i>=0 && y+i<8 && this.getPiece(x+pawnShift,y+i)==VariantRules.PAWN
+ && this.getColor(x+pawnShift,y+i)==c)
+ {
+ return true;
+ }
+ }
+ }
+ }
+ return false;
+ }
+
+ underCheck(move)
{
- const color = c == 'c' ? this.turn : c;
+ const color = this.turn;
this.play(move);
- let res = this.isAttacked(this.kingPos[color], this.getOppCol(color))
- || this.isAttacked(this.kingPos[color], 'c'); //TODO: quite inefficient...
+ let res = this.isAttacked(this.kingPos[color], [this.getOppCol(color),'c']);
this.undo(move);
return res;
}
- getCheckSquares(move, c)
+ getCheckSquares(move)
{
this.play(move);
+ const color = this.turn;
this.moves.push(move); //artifically change turn, for checkered pawns (TODO)
- const kingAttacked = this.isAttacked(this.kingPos[c], this.getOppCol(c))
- || this.isAttacked(this.kingPos[c], 'c');
+ const kingAttacked = this.isAttacked(this.kingPos[color], [this.getOppCol(color),'c']);
let res = kingAttacked
- ? [ JSON.parse(JSON.stringify(this.kingPos[c])) ] //need to duplicate!
+ ? [ JSON.parse(JSON.stringify(this.kingPos[color])) ] //need to duplicate!
: [ ];
this.moves.pop();
this.undo(move);
this.flags[1][move.start.x==6 ? "w" : "b"][move.start.y] = false;
}
- checkGameEnd(color)
+ checkGameEnd()
{
+ const color = this.turn;
if (!this.isAttacked(this.kingPos[color], this.getOppCol(color))
&& !this.isAttacked(this.kingPos[color], 'c'))
{
projects / vchess.git / blobdiff