variants/_Antiking/class.js

   1 import ChessRules from "/base_rules.js";
   2
   3 export default class AbstractAntikingRules extends ChessRules {
   4
   5   static get Aliases() {
   6     return Object.assign({'A': AbstractAntikingRules}, ChessRules.Aliases);
   7   }
   8
   9   static get Options() {
  10     return {
  11       styles: [
  12         "atomic",
  13         "balance",
  14         "cannibal",
  15         "capture",
  16         "crazyhouse",
  17         "doublemove",
  18         "madrasi",
  19         "progressive",
  20         "recycle",
  21         "rifle",
  22         "teleport",
  23         "zen"
  24       ]
  25     };
  26   }
  27
  28   pieces(color, x, y) {
  29     return Object.assign(
  30       {
  31         'a': {
  32           // Move like a king, no attacks
  33           "class": "antiking",
  34           moves: super.pieces(color, x, y)['k'].moves,
  35           attack: []
  36         }
  37       },
  38       super.pieces(color, x, y)
  39     );
  40   }
  41
  42   isKing(x, y, p) {
  43     if (!p)
  44       p = this.getPiece(x, y);
  45     return ['k', 'a'].includes(p);
  46   }
  47
  48   // NOTE: canTake includes (wrong) captures of antiking,
  49   // to not go to low-level using findDestSquares()
  50   canTake([x1, y1], [x2, y2]) {
  51     const piece1 = this.getPiece(x1, y1);
  52     const color1 = this.getColor(x1, y1);
  53     const color2 = this.getColor(x2, y2);
  54     return (
  55       (piece1 != 'a' && color1 != color2) ||
  56       (piece1 == 'a' && color1 == color2)
  57     );
  58   }
  59
  60   // Remove captures of antiking (see above)
  61   getPotentialMovesFrom([x, y]) {
  62     return super.getPotentialMovesFrom([x, y]).filter(m =>
  63       m.vanish.length == 1 || m.vanish[1].p != 'a');
  64   }
  65
  66   underCheck(squares, color) {
  67     let res = false;
  68     squares.forEach(sq => {
  69       switch (this.getPiece(sq[0], sq[1])) {
  70         case 'k':
  71           res ||= super.underAttack(sq, color);
  72           break;
  73         case 'a':
  74           res ||= !super.underAttack(sq, color);
  75           break;
  76       }
  77     });
  78     return res;
  79   }
  80
  81 };