variants/Allmate/class.js

   1 import ChessRules from "/base_rules.js";
   2 import PiPo from "/utils/PiPo.js";
   3 import Move from "/utils/Move.js";
   4
   5 export default class AllmateRules extends ChessRules {
   6
   7   static get Options() {
   8     return {
   9       select: C.Options.select,
  10       styles: [
  11         "cylinder",
  12         "madrasi",
  13         "zen"
  14       ]
  15     };
  16   }
  17
  18   get hasEnpassant() {
  19     return false;
  20   }
  21
  22   setOtherVariables(fenParsed) {
  23     super.setOtherVariables(fenParsed);
  24     this.curMove = null;
  25   }
  26
  27   getPotentialMovesFrom(sq) {
  28     // Remove direct captures:
  29     return super.getPotentialMovesFrom(sq)
  30       .filter(m => m.vanish.length == m.appear.length);
  31   }
  32
  33   // Called "recursively" before a move is played, until no effect
  34   computeNextMove(move) {
  35     if (move.appear.length > 0)
  36       this.curMove = move;
  37     const color = this.turn;
  38     const oppCol = C.GetOppTurn(this.turn);
  39     let mv = new Move({
  40       start: this.curMove.end,
  41       end: this.curMove.end,
  42       appear: [],
  43       vanish: []
  44     });
  45     this.playOnBoard(move);
  46     for (let i=0; i<this.size.x; i++) {
  47       for (let j=0; j<this.size.y; j++) {
  48         if (this.getColor(i, j) == oppCol && this.isMated(i, j, color)) {
  49           mv.vanish.push(
  50             new PiPo({x: i, y: j, c: oppCol, p: this.getPiece(i, j)})
  51           );
  52         }
  53       }
  54     }
  55     this.undoOnBoard(move);
  56     move.next = (mv.vanish.length > 0 ? mv : null);
  57   }
  58
  59   // is piece on square x,y mated by color?
  60   isMated(x, y, color) {
  61     const myColor = C.GetOppTurn(color);
  62     if (!super.underAttack([x, y], [color]))
  63       return false;
  64     for (let i=0; i<this.size.x; i++) {
  65       for (let j=0; j<this.size.y; j++) {
  66         if (this.getColor(i, j) == myColor) {
  67           const movesIJ = super.getPotentialMovesFrom([i, j], myColor);
  68           for (let move of movesIJ) {
  69             this.playOnBoard(move);
  70             let testSquare = [x, y];
  71             if (i == x && j == y) {
  72               // The mated-candidate has moved itself
  73               testSquare = [move.end.x, move.end.y]; }
  74             const res = this.underAttack(testSquare, [color]);
  75             this.undoOnBoard(move);
  76             if (!res)
  77               return false;
  78           }
  79         }
  80       }
  81     }
  82     return true;
  83   }
  84
  85   underCheck() {
  86     return false; //not relevant here
  87   }
  88
  89   filterValid(moves) {
  90     return moves; //TODO?: over-simplification to be fixed later
  91   }
  92
  93 };