client/src/variants/Knightmate.js

   1 import { ChessRules } from "@/base_rules";
   2 import { ArrayFun } from "@/utils/array";
   3 import { randInt } from "@/utils/alea";
   4
   5 export class KnightmateRules extends ChessRules {
   6
   7   static get COMMONER() {
   8     return "c";
   9   }
  10
  11   static get PIECES() {
  12     return ChessRules.PIECES.concat([V.COMMONER]);
  13   }
  14
  15   getPpath(b) {
  16     return ([V.KING, V.COMMONER].includes(b[1]) ? "Knightmate/" : "") + b;
  17   }
  18
  19   static GenRandInitFen(randomness) {
  20     return ChessRules.GenRandInitFen(randomness)
  21       .replace(/n/g, 'c').replace(/N/g, 'C');
  22   }
  23
  24   getPotentialMovesFrom([x, y]) {
  25     switch (this.getPiece(x, y)) {
  26       case V.COMMONER:
  27         return this.getPotentialCommonerMoves([x, y]);
  28       default:
  29         return super.getPotentialMovesFrom([x, y]);
  30     }
  31   }
  32
  33   getPotentialCommonerMoves(sq) {
  34     return this.getSlideNJumpMoves(
  35       sq,
  36       V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
  37       "oneStep"
  38     );
  39   }
  40
  41   getPotentialKingMoves(sq) {
  42     return super.getPotentialKnightMoves(sq).concat(super.getCastleMoves(sq));
  43   }
  44
  45   isAttacked(sq, color) {
  46     return (
  47       this.isAttackedByCommoner(sq, color) ||
  48       this.isAttackedByPawn(sq, color) ||
  49       this.isAttackedByRook(sq, color) ||
  50       this.isAttackedByBishop(sq, color) ||
  51       this.isAttackedByQueen(sq, color) ||
  52       this.isAttackedByKing(sq, color)
  53     );
  54   }
  55
  56   isAttackedByKing(sq, color) {
  57     return this.isAttackedBySlideNJump(
  58       sq,
  59       color,
  60       V.KING,
  61       V.steps[V.KNIGHT],
  62       "oneStep"
  63     );
  64   }
  65
  66   isAttackedByCommoner(sq, color) {
  67     return this.isAttackedBySlideNJump(
  68       sq,
  69       color,
  70       V.COMMONER,
  71       V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
  72       "oneStep"
  73     );
  74   }
  75
  76   static get VALUES() {
  77     return {
  78       p: 1,
  79       r: 5,
  80       c: 5, //the commoner is valuable
  81       b: 3,
  82       q: 9,
  83       k: 1000
  84     };
  85   }
  86
  87 };