const color = move.vanish[0].c;
const pawnShift = color == "w" ? -1 : 1;
const startRank = color == "w" ? V.size.x - 2 : 1;
- const lastRank = color == "w" ? 0 : V.size.x - 1;
return (
- // The queen is discovered if she reaches the 8th rank,
- // even if this would be a technically valid pawn move.
- move.end.x != lastRank &&
(
+ move.end.x - move.start.x == pawnShift &&
(
- move.end.x - move.start.x == pawnShift &&
(
- (
- // Normal move
- move.end.y == move.start.y &&
- this.board[move.end.x][move.end.y] == V.EMPTY
- )
- ||
- (
- // Capture
- Math.abs(move.end.y - move.start.y) == 1 &&
- this.board[move.end.x][move.end.y] != V.EMPTY
- )
+ // Normal move
+ move.end.y == move.start.y &&
+ this.board[move.end.x][move.end.y] == V.EMPTY
+ )
+ ||
+ (
+ // Capture
+ Math.abs(move.end.y - move.start.y) == 1 &&
+ this.board[move.end.x][move.end.y] != V.EMPTY
)
)
- ||
- (
- // Two-spaces initial jump
- move.start.x == startRank &&
- move.end.y == move.start.y &&
- move.end.x - move.start.x == 2 * pawnShift &&
- this.board[move.end.x][move.end.y] == V.EMPTY
- )
+ )
+ ||
+ (
+ // Two-spaces initial jump
+ move.start.x == startRank &&
+ move.end.y == move.start.y &&
+ move.end.x - move.start.x == 2 * pawnShift &&
+ this.board[move.end.x][move.end.y] == V.EMPTY
)
);
}
getPotentialMovesFrom([x, y]) {
if (this.getPiece(x, y) == V.HIDDEN_QUEEN) {
- const pawnMoves = super.getPotentialPawnMoves([x, y]);
+ const pawnMoves = this.getPotentialPawnMoves([x, y]);
let queenMoves = super.getPotentialQueenMoves([x, y]);
// Remove from queen moves those corresponding to a pawn move:
queenMoves = queenMoves
return super.getPotentialMovesFrom([x, y]);
}
+ // TODO: find a more general way to describe pawn movements to avoid
+ // re-writing almost the same function for several variants.
+ getPotentialPawnMoves([x, y]) {
+ const color = this.turn;
+ const piece = this.getPiece(x, y);
+ let moves = [];
+ const [sizeX, sizeY] = [V.size.x, V.size.y];
+ const shiftX = color == "w" ? -1 : 1;
+ const startRank = color == "w" ? sizeX - 2 : 1;
+ const lastRank = color == "w" ? 0 : sizeX - 1;
+
+ const finalPieces =
+ x + shiftX == lastRank
+ ? piece == V.PAWN
+ ? [V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN]
+ : [V.QUEEN] //hidden queen revealed
+ : [piece]; //V.PAWN
+ if (this.board[x + shiftX][y] == V.EMPTY) {
+ // One square forward
+ for (let p of finalPieces) {
+ moves.push(
+ this.getBasicMove([x, y], [x + shiftX, y], {
+ c: color,
+ p: p
+ })
+ );
+ }
+ if (
+ x == startRank &&
+ this.board[x + 2 * shiftX][y] == V.EMPTY
+ ) {
+ // Two squares jump
+ moves.push(this.getBasicMove([x, y], [x + 2 * shiftX, y]));
+ }
+ }
+ // Captures
+ for (let shiftY of [-1, 1]) {
+ if (
+ y + shiftY >= 0 &&
+ y + shiftY < sizeY &&
+ this.board[x + shiftX][y + shiftY] != V.EMPTY &&
+ this.canTake([x, y], [x + shiftX, y + shiftY])
+ ) {
+ for (let p of finalPieces) {
+ moves.push(
+ this.getBasicMove([x, y], [x + shiftX, y + shiftY], {
+ c: color,
+ p: p
+ })
+ );
+ }
+ }
+ }
+
+ // En passant
+ const Lep = this.epSquares.length;
+ const epSquare = this.epSquares[Lep - 1]; //always at least one element
+ if (
+ !!epSquare &&
+ epSquare.x == x + shiftX &&
+ Math.abs(epSquare.y - y) == 1
+ ) {
+ let enpassantMove = this.getBasicMove([x, y], [epSquare.x, epSquare.y]);
+ enpassantMove.vanish.push({
+ x: x,
+ y: epSquare.y,
+ p: "p",
+ c: this.getColor(x, epSquare.y)
+ });
+ moves.push(enpassantMove);
+ }
+
+ return moves;
+ }
+
getPossibleMovesFrom(sq) {
this.side = this.turn;
return this.filterValid(this.getPotentialMovesFrom(sq));
}
- static GenRandInitFen() {
- let fen = ChessRules.GenRandInitFen();
- // Place hidden queens at random:
+ static GenRandInitFen(randomness) {
+ let fen = ChessRules.GenRandInitFen(randomness);
+ // Place hidden queens at random (always):
let hiddenQueenPos = randInt(8);
let pawnRank = "PPPPPPPP".split("");
pawnRank[hiddenQueenPos] = "T";
return fen;
}
- updateVariables(move) {
- super.updateVariables(move);
+ postPlay(move) {
+ super.postPlay(move);
if (move.vanish.length == 2 && move.vanish[1].p == V.KING)
// We took opponent king
this.kingPos[this.turn] = [-1, -1];
}
- unupdateVariables(move) {
- super.unupdateVariables(move);
- const c = move.vanish[0].c;
- const oppCol = V.GetOppCol(c);
+ preUndo(move) {
+ super.preUndo(move);
+ const oppCol = this.turn;
if (this.kingPos[oppCol][0] < 0)
- // Last move took opponent's king:
+ // Move takes opponent's king:
this.kingPos[oppCol] = [move.vanish[1].x, move.vanish[1].y];
}
this.side = this.turn;
return super.getComputerMove();
}
+
+ getNotation(move) {
+ const notation = super.getNotation(move);
+ if (notation.charAt(0) == 'T')
+ // Do not reveal hidden queens
+ return notation.substr(1);
+ return notation;
+ }
};