client/src/variants/Knightpawns.js

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