variants/Alapo/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 AlapoRules extends ChessRules {
   6
   7   get hasFlags() {
   8     return false;
   9   }
  10   get hasEnpassant() {
  11     return false;
  12   }
  13
  14   getSvgChessboard() {
  15     let board = super.getSvgChessboard().slice(0, -6);
  16     // Add lines to delimitate goals
  17     board += `
  18       <line x1="0" y1="10" x2="60" y2="10" stroke="black" stroke-width="0.1"/>
  19       <line x1="0" y1="50" x2="60" y2="50" stroke="black" stroke-width="0.1"/>
  20       </svg>`;
  21     return board;
  22   }
  23
  24   genRandInitFen(seed) {
  25     if (this.options["randomness"] == 0)
  26       return "rbqqbr/tcssct/6/6/TCSSCT/RBQQBR w 0";
  27
  28     Random.setSeed(seed);
  29
  30     const piece2pawn = {
  31       r: 't',
  32       q: 's',
  33       b: 'c'
  34     };
  35
  36     let pieces = { w: new Array(6), b: new Array(6) };
  37     // Shuffle pieces on first (and last rank if randomness == 2)
  38     for (let c of ["w", "b"]) {
  39       if (c == 'b' && this.options["randomness"] == 1) {
  40         pieces['b'] = pieces['w'];
  41         break;
  42       }
  43
  44       let positions = ArrayFun.range(6);
  45
  46       // Get random squares for bishops
  47       let randIndex = 2 * Random.randInt(3);
  48       const bishop1Pos = positions[randIndex];
  49       let randIndex_tmp = 2 * Random.randInt(3) + 1;
  50       const bishop2Pos = positions[randIndex_tmp];
  51       positions.splice(Math.max(randIndex, randIndex_tmp), 1);
  52       positions.splice(Math.min(randIndex, randIndex_tmp), 1);
  53
  54       // Get random square for queens
  55       randIndex = Random.randInt(4);
  56       const queen1Pos = positions[randIndex];
  57       positions.splice(randIndex, 1);
  58       randIndex = Random.randInt(3);
  59       const queen2Pos = positions[randIndex];
  60       positions.splice(randIndex, 1);
  61
  62       // Rooks positions are now fixed,
  63       const rook1Pos = positions[0];
  64       const rook2Pos = positions[1];
  65
  66       pieces[c][rook1Pos] = "r";
  67       pieces[c][bishop1Pos] = "b";
  68       pieces[c][queen1Pos] = "q";
  69       pieces[c][queen2Pos] = "q";
  70       pieces[c][bishop2Pos] = "b";
  71       pieces[c][rook2Pos] = "r";
  72     }
  73
  74     return (
  75       pieces["b"].join("") + "/" +
  76       pieces["b"].map(p => piece2pawn[p]).join("") +
  77       "/6/6/" +
  78       pieces["w"].map(p => piece2pawn[p].toUpperCase()).join("") + "/" +
  79       pieces["w"].join("").toUpperCase() +
  80       " w 0"
  81     );
  82   }
  83
  84   pieces(color, x, y) {
  85     return {
  86       'r': super.pieces(color, x, y)['r'],
  87       'q': super.pieces(color, x, y)['q'],
  88       'b': {
  89         // Triangle is rotated from opponent viewpoint
  90         "class": "bishop" + (this.playerColor != color ? "_inv" : ""),
  91         moves: [ { steps: [[1, 1], [1, -1], [-1, 1], [-1, -1]] } ]
  92       },
  93       's': { //"square"
  94         "class": "babyrook",
  95         moves: [
  96           {
  97             steps: [[0, 1], [0, -1], [1, 0], [-1, 0]],
  98             range: 1
  99           }
 100         ]
 101       },
 102       'c': { //"circle"
 103         "class": "babyqueen",
 104         moves: [
 105           {
 106             steps: [
 107               [0, 1], [0, -1], [1, 0], [-1, 0],
 108               [1, 1], [1, -1], [-1, 1], [-1, -1]
 109             ],
 110             range: 1
 111           }
 112         ]
 113       },
 114       't': { //"triangle"
 115         "class": "babybishop" + (this.playerColor != color ? "_inv" : ""),
 116         moves: [
 117           {
 118             steps: [[1, 1], [1, -1], [-1, 1], [-1, -1]],
 119             range: 1
 120           }
 121         ]
 122       }
 123     };
 124   }
 125
 126   get size() {
 127     return {
 128       x: 6,
 129       y: 6
 130     };
 131   }
 132
 133   filterValid(moves) {
 134     return moves;
 135   }
 136
 137   getCurrentScore() {
 138     // Try both colors (to detect potential suicides)
 139     let won = {};
 140     for (let c of ['w', 'b']) {
 141       const oppCol = C.GetOppCol(c);
 142       const goal = (c == 'w' ? 0 : 5);
 143       won[c] = this.board[goal].some((b,j) => {
 144         return (
 145           this.getColor(goal, j) == c &&
 146           this.findCapturesOn(
 147             [goal, j], {one: true, oppCol: oppCol}).length == 0
 148         );
 149       });
 150     }
 151     if (won['w'] && won['b'])
 152       return "?"; //no idea who won, not relevant anyway :)
 153     return (won['w'] ? "1-0" : (won['b'] ? "0-1" : "*"));
 154   }
 155
 156 };