client/src/variants/Knightpawns.js

   1 import { ChessRules } from "@/base_rules";
   2
   3 export class KnightpawnsRules extends ChessRules {
   4
   5   static get Options() {
   6     return null;
   7   }
   8
   9   static get PawnSpecs() {
  10     return Object.assign(
  11       {},
  12       ChessRules.PawnSpecs,
  13       // The promotion piece doesn't matter, the game is won
  14       { promotions: [V.QUEEN] }
  15     );
  16   }
  17
  18   static get HasFlags() {
  19     return false;
  20   }
  21
  22   scanKings() {}
  23
  24   static GenRandInitFen() {
  25     return "8/ppp5/8/8/8/8/8/6N1 w 0 -";
  26   }
  27
  28   filterValid(moves) {
  29     return moves;
  30   }
  31
  32   getCheckSquares() {
  33     return [];
  34   }
  35
  36   getCurrentScore() {
  37     // If all pieces of some color vanished, the opponent wins:
  38     for (let c of ['w', 'b']) {
  39       if (this.board.every(b => b.every(cell => !cell || cell[0] != c)))
  40         return (c == 'w' ? "0-1" : "1-0");
  41     }
  42     // Did a black pawn promote? Can the knight take it?
  43     const qIdx = this.board[7].findIndex(cell => cell[1] == V.QUEEN);
  44     if (
  45       qIdx >= 0 &&
  46       (this.turn == 'b' || !super.isAttackedByKnight([7, qIdx], 'w'))
  47     ) {
  48       return "0-1";
  49     }
  50     if (!this.atLeastOneMove()) return "1/2";
  51     return "*";
  52   }
  53
  54   postPlay() {}
  55   postUndo() {}
  56
  57 };