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     let antikingSpec = super.pieces(color, x, y)['k'];
  30     antikingSpec["class"] = "antiking";
  31     return Object.assign({'a': antikingSpec}, super.pieces(color, x, y));
  32   }
  33
  34   isKing(x, y, p) {
  35     if (!p)
  36       p = this.getPiece(x, y);
  37     return ['k', 'a'].includes(p);
  38   }
  39
  40   // NOTE: canTake includes (wrong) captures of (anti)king,
  41   // to detect attacks on (anti)kings.
  42   canTake([x1, y1], [x2, y2]) {
  43     const piece1 = this.getPiece(x1, y1);
  44     const color1 = this.getColor(x1, y1);
  45     const color2 = this.getColor(x2, y2);
  46     return (
  47       (piece1 != 'a' && color1 != color2) ||
  48       (piece1 == 'a' && color1 == color2)
  49     );
  50   }
  51
  52   // Remove captures of (anti)king (see above)
  53   getPotentialMovesFrom([x, y]) {
  54     return super.getPotentialMovesFrom([x, y]).filter(m =>
  55       m.vanish.length == 1 || !['k', 'a'].includes(m.vanish[1].p));
  56   }
  57
  58   underCheck(square_s, color) {
  59     let res = false;
  60     square_s.forEach(sq => {
  61       switch (this.getPiece(sq[0], sq[1])) {
  62         case 'k':
  63           res ||= super.underAttack(sq, [color]);
  64           break;
  65         case 'a':
  66           res ||= !super.underAttack(sq, [color]);
  67           break;
  68       }
  69     });
  70     return res;
  71   }
  72
  73 };