client/src/variants/Knightpawns.js

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