| 1 | import { ChessRules } from "@/base_rules"; |
| 2 | |
| 3 | export class EvolutionRules extends ChessRules { |
| 4 | |
| 5 | getPotentialMovesFrom([x, y]) { |
| 6 | let moves = super.getPotentialMovesFrom([x, y]); |
| 7 | const c = this.getColor(x, y); |
| 8 | const piece = this.getPiece(x, y); |
| 9 | if ( |
| 10 | [V.BISHOP, V.ROOK, V.QUEEN].includes(piece) && |
| 11 | (c == 'w' && x == 7) || (c == 'b' && x == 0) |
| 12 | ) { |
| 13 | // Move from first rank |
| 14 | const forward = (c == 'w' ? -1 : 1); |
| 15 | for (let shift of [-2, 0, 2]) { |
| 16 | if ( |
| 17 | (piece == V.ROOK && shift != 0) || |
| 18 | (piece == V.BISHOP && shift == 0) |
| 19 | ) { |
| 20 | continue; |
| 21 | } |
| 22 | if ( |
| 23 | V.OnBoard(x+2*forward, y+shift) && |
| 24 | this.board[x+forward][y+shift/2] != V.EMPTY && |
| 25 | this.getColor(x+2*forward, y+shift) != c |
| 26 | ) { |
| 27 | moves.push(this.getBasicMove([x,y], [x+2*forward,y+shift])); |
| 28 | } |
| 29 | } |
| 30 | } |
| 31 | return moves; |
| 32 | } |
| 33 | |
| 34 | }; |