variants/Copycat/class.js

   1 import ChessRules from "/base_rules.js";
   2
   3 export default class CopycatRules extends ChessRules {
   4
   5   static get Options() {
   6     return {
   7       select: C.Options.select,
   8       input: C.Options.input,
   9       styles: C.Options.styles.filter(s => !["madrasi", "zen"].includes(s))
  10     };
  11   }
  12
  13   getStepSpec(color, x, y) {
  14     let res = super.getStepSpec(color, x, y);
  15     const piece = this.getPiece(x,y);
  16     if (['p', 'k'].includes(piece))
  17       return res;
  18     // Now check if the piece at x, y attack some friendly one (enhancement)
  19     let movements = {};
  20     const steps = this.pieces()[piece].both[0].steps;
  21     steps.forEach(s => {
  22       let [i, j] = [x + s[0], y + s[1]];
  23       while (
  24         this.onBoard(i, j) &&
  25         this.board[i][j] == "" &&
  26         piece != 'n'
  27       ) {
  28         i += s[0];
  29         j += s[1];
  30       }
  31       if (this.onBoard(i, j) && this.getColor(i, j) == color) {
  32         const attacked = this.getPiece(i, j);
  33         if (['r', 'b', 'n'].includes(attacked)) {
  34           if (!movements[attacked])
  35             movements[attacked] = true;
  36         }
  37         else if (attacked == 'q') {
  38           if (!movements['r'])
  39             movements['r'] = true;
  40           if (!movements['b'])
  41             movements['b'] = true;
  42         }
  43       }
  44     });
  45     Object.keys(movements).forEach(type => {
  46       if ((piece != 'q' && type != piece) || (piece == 'q' && type == 'n'))
  47         res.both.push(this.pieces()[type].both[0]);
  48     });
  49     return res;
  50   }
  51
  52 };