client/src/variants/Evolution.js

   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 };