client/src/variants/Capture.js

   1 import { ChessRules } from "@/base_rules";
   2 import { ArrayFun } from "@/utils/array";
   3 import { randInt } from "@/utils/alea";
   4
   5 export const VariantRules = class LosersRules extends ChessRules {
   6   // Trim all non-capturing moves
   7   static KeepCaptures(moves) {
   8     return moves.filter(m => m.vanish.length == 2 && m.appear.length == 1);
   9   }
  10
  11     // Stop at the first capture found (if any)
  12   atLeastOneCapture() {
  13     const color = this.turn;
  14     const oppCol = V.GetOppCol(color);
  15     for (let i = 0; i < V.size.x; i++) {
  16       for (let j = 0; j < V.size.y; j++) {
  17         if (
  18           this.board[i][j] != V.EMPTY &&
  19           this.getColor(i, j) != oppCol &&
  20           this.getPotentialMovesFrom([i, j]).some(m =>
  21             // Warning: duscard castle moves
  22             m.vanish.length == 2 && m.appear.length == 1)
  23         ) {
  24           return true;
  25         }
  26       }
  27     }
  28     return false;
  29   }
  30
  31   getPossibleMovesFrom(sq) {
  32     let moves = this.filterValid(this.getPotentialMovesFrom(sq));
  33     const captureMoves = V.KeepCaptures(moves);
  34     if (captureMoves.length > 0) return captureMoves;
  35     if (this.atLeastOneCapture()) return [];
  36     return moves;
  37   }
  38
  39   getAllValidMoves() {
  40     const moves = super.getAllValidMoves();
  41     if (moves.some(m => m.vanish.length == 2)) return V.KeepCaptures(moves);
  42     return moves;
  43   }
  44
  45   static get SEARCH_DEPTH() {
  46     return 4;
  47   }
  48 };