- getPotentialPawnMoves([x, y]) {
- const color = this.turn;
- let moves = [];
- const [sizeX, sizeY] = [V.size.x, V.size.y];
- const shiftX = color == "w" ? -1 : 1;
- const startRank = color == "w" ? sizeX - 2 : 1;
-
- if (this.board[x + shiftX][y] == V.EMPTY) {
- // One square forward
- moves.push(this.getBasicMove([x, y], [x + shiftX, y]));
- // Next condition because pawns on 1st rank can generally jump
- 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: also possible backward
- for (let shiftY of [-1, 1]) {
- if (y + shiftY >= 0 && y + shiftY < sizeY) {
- for (let direction of [-1,1]) {
- if (
- this.board[x + direction][y + shiftY] != V.EMPTY &&
- this.canTake([x, y], [x + direction, y + shiftY])
- ) {
- moves.push(this.getBasicMove([x, y], [x + direction, y + shiftY]));
- }
- }
- }
- }
-
- // 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;
- }
-