variants/Giveaway/class.js

   1 import ChessRules from "/base_rules.js";
   2 import { ArrayFun } from "/utils/array.js";
   3 import { Random } from "/utils/alea.js";
   4
   5 export default class GiveawayRules extends ChessRules {
   6
   7   static get Options() {
   8     return {
   9       select: [
  10         {
  11           label: "Mode",
  12           variable: "mode",
  13           defaut: "suicide",
  14           options: [
  15             {label: "Suicide", value: "suicide"},
  16             {label: "Losers", value: "losers"}
  17           ]
  18         }
  19       ].concat(C.Options.select),
  20       input: C.Options.input.filter(i => i.variable == "pawnfall"),
  21       styles: [
  22         "atomic", "cannibal", "cylinder", "dark",
  23         "madrasi", "rifle", "teleport", "zen"
  24       ]
  25     };
  26   }
  27
  28   get hasFlags() {
  29     return this.options["mode"] == "losers";
  30   }
  31
  32   get pawnPromotions() {
  33     let res = ['q', 'r', 'n', 'b'];
  34     if (this.options["mode"] == "suicide")
  35       res.push('k');
  36     return res;
  37   }
  38
  39   genRandInitFen(seed) {
  40     if (this.options["mode"] == "losers")
  41       return super.genRandInitFen(seed);
  42
  43     if (this.options["randomness"] == 0) {
  44       return (
  45         'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w 0 {"enpassant":"-"}'
  46       );
  47     }
  48
  49     Random.setSeed(seed);
  50     let pieces = { w: new Array(8), b: new Array(8) };
  51     for (let c of ["w", "b"]) {
  52       if (c == 'b' && this.options["randomness"] == 1) {
  53         pieces['b'] = pieces['w'];
  54         break;
  55       }
  56
  57       // Get random squares for every piece, totally freely
  58       let positions = Random.shuffle(ArrayFun.range(8));
  59       const composition = ['b', 'b', 'r', 'r', 'n', 'n', 'k', 'q'];
  60       const rem2 = positions[0] % 2;
  61       if (rem2 == positions[1] % 2) {
  62         // Fix bishops (on different colors)
  63         for (let i=2; i<8; i++) {
  64           if (positions[i] % 2 != rem2) {
  65             [positions[1], positions[i]] = [positions[i], positions[1]];
  66             break;
  67           }
  68         }
  69       }
  70       for (let i = 0; i < 8; i++)
  71         pieces[c][positions[i]] = composition[i];
  72     }
  73     return (
  74       pieces["b"].join("") +
  75       "/pppppppp/8/8/8/8/PPPPPPPP/" +
  76       pieces["w"].join("").toUpperCase() +
  77       // En-passant allowed, but no flags
  78       ' w 0 {"enpassant":"-"}'
  79     );
  80   }
  81
  82   constructor(o) {
  83     o.options["capture"] = true;
  84     super(o);
  85   }
  86
  87   underCheck([x, y], oppCol) {
  88     if (this.options["mode"] == "suicide")
  89       return false;
  90     return super.underCheck([x, y], oppCol);
  91   }
  92
  93   getCurrentScore() {
  94     if (this.atLeastOneMove()) return "*";
  95     // No valid move: the side who cannot move wins
  96     return (this.turn == "w" ? "1-0" : "0-1");
  97   }
  98
  99 };