variants/Antiking1/class.js

   1 import ChessRules from "/base_rules.js";
   2 import AbstractAntikingRules from "/variants/_Antiking/class.js";
   3 import BerolinaPawnSpec from "/variants/_Berolina/pawnSpec.js";
   4
   5 export default class Antiking1Rules extends AbstractAntikingRules {
   6
   7   get hasCastle() {
   8     return false;
   9   }
  10   get hasEnpassant() {
  11     return false;
  12   }
  13
  14   pieces(color, x, y) {
  15     let res = super.pieces(color, x, y);
  16     res['p'] = BerolinaPawnSpec(color); //no 2-squares moves
  17     return res;
  18   }
  19
  20   genRandInitBaseFen() {
  21     // Always deterministic setup
  22     return {
  23       fen: "2prbkqA/2p1nnbr/2pppppp/8/8/PPPPPP2/RBNN1P2/aQKBRP2",
  24       o: {"flags": "KAka"}
  25     };
  26   }
  27
  28   // (Anti)King flags at 1 (true) if they can knight-jump
  29   setFlags(fenflags) {
  30     this.kingFlags = { w: {}, b: {} };
  31     for (let i=0; i<fenflags.length; i++) {
  32       const white = fenflags.charCodeAt(i) <= 90;
  33       const curChar = fenflags.charAt(i).toLowerCase();
  34       this.kingFlags[white ? 'w' : 'b'][curChar] = true;
  35     }
  36   }
  37
  38   getFlagsFen() {
  39     return (
  40       Array.prototype.concat.apply([],
  41         ['w', 'b'].map(c => {
  42           const res = Object.keys(this.kingFlags[c]).join("");
  43           return (c == 'w' ? res.toUpperCase() : res);
  44         })
  45       ).join("")
  46     );
  47   }
  48
  49   getPotentialMovesFrom([x, y]) {
  50     const color = this.turn;
  51     let moves = super.getPotentialMovesFrom([x, y]);
  52     if (this.kingFlags[color][this.getPiece(x, y)]) {
  53       // Allow knight jump (king or antiking)
  54       const knightMoves = super.getPotentialMovesOf('n', [x, y]);
  55       // Remove captures (TODO: could be done more efficiently...)
  56       moves = moves.concat(knightMoves.filter(m => m.vanish.length == 1));
  57     }
  58     return moves;
  59   }
  60
  61   prePlay(move) {
  62     super.prePlay(move);
  63     // Update king+antiking flags
  64     const piece = move.vanish[0].p;
  65     if (this.isKing(0, 0, piece))
  66       delete this.kingFlags[move.vanish[0].c][piece];
  67   }
  68
  69 };