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