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["randomness"] == 0) {
  41       return (
  42         'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w 0 {"enpassant":"-"}'
  43       );
  44     }
  45
  46     Random.setSeed(seed);
  47     let pieces = { w: new Array(8), b: new Array(8) };
  48     for (let c of ["w", "b"]) {
  49       if (c == 'b' && this.options["randomness"] == 1) {
  50         pieces['b'] = pieces['w'];
  51         break;
  52       }
  53
  54       // Get random squares for every piece, totally freely
  55       let positions = Random.shuffle(ArrayFun.range(8));
  56       const composition = ['b', 'b', 'r', 'r', 'n', 'n', 'k', 'q'];
  57       const rem2 = positions[0] % 2;
  58       if (rem2 == positions[1] % 2) {
  59         // Fix bishops (on different colors)
  60         for (let i=2; i<8; i++) {
  61           if (positions[i] % 2 != rem2) {
  62             [positions[1], positions[i]] = [positions[i], positions[1]];
  63             break;
  64           }
  65         }
  66       }
  67       for (let i = 0; i < 8; i++)
  68         pieces[c][positions[i]] = composition[i];
  69     }
  70     return (
  71       pieces["b"].join("") +
  72       "/pppppppp/8/8/8/8/PPPPPPPP/" +
  73       pieces["w"].join("").toUpperCase() +
  74       // En-passant allowed, but no flags
  75       ' w 0 {"enpassant":"-"}'
  76     );
  77   }
  78
  79   constructor(o) {
  80     o.options["capture"] = true;
  81     super(o);
  82   }
  83
  84   underCheck([x, y], oppCol) {
  85     if (this.options["mode"] == "suicide")
  86       return false;
  87     return super.underCheck([x, y], oppCol);
  88   }
  89
  90   getCurrentScore() {
  91     if (this.atLeastOneMove()) return "*";
  92     // No valid move: the side who cannot move wins
  93     return (this.turn == "w" ? "1-0" : "0-1");
  94   }
  95
  96 };