variants/Suction/class.js

   1 import ChessRules from "/base_rules.js";
   2 import GiveawayRules from "/variants/Giveaway/class.js";
   3 import PiPo from "/utils/PiPo.js";
   4 import Move from "/utils/Move.js";
   5
   6 export default class SuctionRules extends ChessRules {
   7
   8   static get Options() {
   9     return {
  10       select: C.Options.select,
  11       styles: [
  12         "balance",
  13         "capture",
  14         "cylinder",
  15         "dark",
  16         "doublemove",
  17         "madrasi",
  18         "progressive",
  19         "teleport"
  20       ]
  21     };
  22   }
  23
  24   get pawnPromotions() {
  25     return ['p']; //no promotions
  26   }
  27
  28   get hasFlags() {
  29     return false;
  30   }
  31
  32   setOtherVariables(fenParsed) {
  33     super.setOtherVariables(fenParsed);
  34     this.cmove = null;
  35     const cmove_str = fenParsed.cmove;
  36     if (cmove_str != "-") {
  37       this.cmove = {
  38         start: C.SquareToCoords(cmove_str.substr(0, 2)),
  39         end: C.SquareToCoords(cmove_str.substr(2))
  40       };
  41     }
  42   }
  43
  44   genRandInitFen(seed) {
  45     const options = Object.assign({mode: "suicide"}, this.options);
  46     const gr = new GiveawayRules({options: options, genFenOnly: true});
  47     // Add empty cmove:
  48     return (
  49       gr.genRandInitFen(seed).slice(0, -17) + '{"enpassant":"-","cmove":"-"}');
  50   }
  51
  52   getFen() {
  53     const cmoveFen = !this.cmove
  54       ? "-"
  55       : C.CoordsToSquare(this.cmove.start) + C.CoordsToSquare(this.cmove.end);
  56     return super.getFen().slice(0, -1) + ',"cmove":"' + cmoveFen + '"}';
  57   }
  58
  59   getBasicMove([sx, sy], [ex, ey]) {
  60     let move = super.getBasicMove([sx, sy], [ex, ey]);
  61     if (move.vanish.length == 2) {
  62       move.appear.push(
  63         new PiPo({
  64           x: sx,
  65           y: sy,
  66           c: move.vanish[1].c,
  67           p: move.vanish[1].p
  68         })
  69       );
  70     }
  71     return move;
  72   }
  73
  74   canIplay(x, y) {
  75     return this.getPiece(x, y) != 'k' && super.canIplay(x, y);
  76   }
  77
  78   // Does m2 un-do m1 ? (to disallow undoing captures)
  79   oppositeMoves(m1, m2) {
  80     return (
  81       !!m1 &&
  82       m2.vanish.length == 2 &&
  83       m1.start.x == m2.start.x &&
  84       m1.end.x == m2.end.x &&
  85       m1.start.y == m2.start.y &&
  86       m1.end.y == m2.end.y
  87     );
  88   }
  89
  90   filterValid(moves) {
  91     return moves.filter(m => !this.oppositeMoves(this.cmove, m));
  92   }
  93
  94   postPlay(move) {
  95     super.postPlay(move);
  96     this.cmove =
  97       (move.vanish.length == 2 ? {start: move.start, end: move.end} : null);
  98   }
  99
 100   atLeastOneMove() {
 101     return true;
 102   }
 103
 104   getCurrentScore() {
 105     const color = this.turn;
 106     const kingPos = super.searchKingPos(color);
 107     if (color == "w" && kingPos[0] == 0) return "0-1";
 108     if (color == "b" && kingPos[0] == this.size.x - 1) return "1-0";
 109     // King is not on the opposite edge: game not over
 110     return "*";
 111   }
 112
 113 };