client/src/variants/Rugby.js

   1 import { ChessRules } from "@/base_rules";
   2 import { ArrayFun } from "@/utils/array";
   3
   4 export class RugbyRules extends ChessRules {
   5   static get HasFlags() {
   6     return false;
   7   }
   8
   9   static get PawnSpecs() {
  10     return Object.assign(
  11       {},
  12       ChessRules.PawnSpecs,
  13       { promotions: [V.PAWN] }
  14     );
  15   }
  16
  17   getPotentialMovesFrom(sq) {
  18     // There are only pawns:
  19     return this.getPotentialPawnMoves(sq);
  20   }
  21
  22   getPotentialPawnMoves(sq) {
  23     const moves = super.getPotentialPawnMoves(sq);
  24     // Add king movements, without capturing
  25     const steps =
  26       this.turn == 'w'
  27         ? [ [-1,-1], [-1,1], [0,1], [0,-1], [1,-1], [1,0], [1,1] ]
  28         : [ [1,-1], [1,1], [0,1], [0,-1], [-1,-1], [-1,0], [-1,1] ];
  29     let addMoves = this.getSlideNJumpMoves(sq, steps, "oneStep");
  30     return moves.concat(addMoves.filter(m => m.vanish.length == 1));
  31   }
  32
  33   static GenRandInitFen() {
  34     // Non-randomized variant. En-passant possible:
  35     return "pppppppp/8/8/8/8/8/8/PPPPPPPP w 0 -";
  36   }
  37
  38   filterValid(moves) {
  39     return moves;
  40   }
  41
  42   prePlay() {}
  43   postPlay() {}
  44   preUndo() {}
  45   postUndo() {}
  46
  47   getCurrentScore() {
  48     // Turn has changed:
  49     const color = V.GetOppCol(this.turn);
  50     const lastRank = (color == "w" ? 0 : V.size.x - 1);
  51     if (ArrayFun.range(8).some(i => this.getColor(lastRank, i) == color))
  52       // The opposing edge is reached!
  53       return color == "w" ? "1-0" : "0-1";
  54     if (this.atLeastOneMove()) return "*";
  55     // Stalemate (will probably never happen)
  56     return "1/2";
  57   }
  58 };