client/src/variants/Knightrelay.js

   1 import { ChessRules } from "@/base_rules";
   2
   3 export const VariantRules = class KnightrelayRules extends ChessRules {
   4   getPotentialMovesFrom([x, y]) {
   5     let moves = super.getPotentialMovesFrom([x, y]);
   6
   7     // Expand possible moves if guarded by a knight:
   8     if (this.getPiece(x,y) != V.KNIGHT) {
   9       const color = this.turn;
  10       let guardedByKnight = false;
  11       for (const step of V.steps[V.KNIGHT]) {
  12         if (
  13           V.OnBoard(x+step[0],y+step[1]) &&
  14           this.getPiece(x+step[0],y+step[1]) == V.KNIGHT &&
  15           this.getColor(x+step[0],y+step[1]) == color
  16         ) {
  17           guardedByKnight = true;
  18           break;
  19         }
  20       }
  21       if (guardedByKnight) {
  22         for (const step of V.steps[V.KNIGHT]) {
  23           if (
  24             V.OnBoard(x+step[0],y+step[1]) &&
  25             this.getColor(x+step[0],y+step[1]) != color
  26           ) {
  27             let m = this.getBasicMove([x,y], [x+step[0],y+step[1]]);
  28             if (!m.appear[0].c || !m.vanish[0].c)
  29               debugger;
  30             moves.push(m);
  31             //moves.push(this.getBasicMove([x,y], [x+step[0],y+step[1]]));
  32           }
  33         }
  34       }
  35     }
  36
  37     return moves;
  38   }
  39
  40   getNotation(move) {
  41     if (move.appear.length == 2 && move.appear[0].p == V.KING)
  42       // Castle
  43       return move.end.y < move.start.y ? "0-0-0" : "0-0";
  44
  45     // Translate final and initial square
  46     const initSquare = V.CoordsToSquare(move.start);
  47     const finalSquare = V.CoordsToSquare(move.end);
  48     const piece = this.getPiece(move.start.x, move.start.y);
  49
  50     // Since pieces and pawns could move like knight, indicate start and end squares
  51     let notation =
  52       piece.toUpperCase() +
  53       initSquare +
  54       (move.vanish.length > move.appear.length ? "x" : "") +
  55       finalSquare
  56
  57     if (
  58       piece == V.PAWN &&
  59       move.appear.length > 0 &&
  60       move.appear[0].p != V.PAWN
  61     ) {
  62       // Promotion
  63       notation += "=" + move.appear[0].p.toUpperCase();
  64     }
  65
  66     return notation;
  67   }
  68 };