client/src/variants/Perfect.js

   1 import { ChessRules } from "@/base_rules";
   2 import { ArrayFun } from "@/utils/array";
   3 import { randInt } from "@/utils/alea";
   4
   5 export class PerfectRules extends ChessRules {
   6   static get PawnSpecs() {
   7     return Object.assign(
   8       {},
   9       ChessRules.PawnSpecs,
  10       {
  11         promotions:
  12           ChessRules.PawnSpecs.promotions
  13           .concat([V.AMAZON, V.EMPRESS, V.PRINCESS])
  14       }
  15     );
  16   }
  17
  18   getPpath(b) {
  19     return (
  20       [V.AMAZON, V.EMPRESS, V.PRINCESS].includes(b[1])
  21         ? "Perfect/"
  22         : ""
  23     ) + b;
  24   }
  25
  26   // Queen + knight
  27   static get AMAZON() {
  28     return "a";
  29   }
  30
  31   // Rook + knight
  32   static get EMPRESS() {
  33     return "e";
  34   }
  35
  36   // Bishop + knight
  37   static get PRINCESS() {
  38     return "s";
  39   }
  40
  41   static get PIECES() {
  42     return ChessRules.PIECES.concat([V.AMAZON, V.EMPRESS, V.PRINCESS]);
  43   }
  44
  45   getPotentialMovesFrom([x, y]) {
  46     switch (this.getPiece(x, y)) {
  47       case V.AMAZON:
  48         return this.getPotentialAmazonMoves([x, y]);
  49       case V.EMPRESS:
  50         return this.getPotentialEmpressMoves([x, y]);
  51       case V.PRINCESS:
  52         return this.getPotentialPrincessMoves([x, y]);
  53       default:
  54         return super.getPotentialMovesFrom([x, y]);
  55     }
  56   }
  57
  58   getPotentialAmazonMoves(sq) {
  59     return super.getPotentialQueenMoves(sq).concat(
  60       this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
  61     );
  62   }
  63
  64   getPotentialEmpressMoves(sq) {
  65     return this.getSlideNJumpMoves(sq, V.steps[V.ROOK]).concat(
  66       this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
  67     );
  68   }
  69
  70   getPotentialPrincessMoves(sq) {
  71     return this.getSlideNJumpMoves(sq, V.steps[V.BISHOP]).concat(
  72       this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep")
  73     );
  74   }
  75
  76   isAttacked(sq, color) {
  77     return (
  78       super.isAttacked(sq, color) ||
  79       this.isAttackedByAmazon(sq, color) ||
  80       this.isAttackedByEmpress(sq, color) ||
  81       this.isAttackedByPrincess(sq, color)
  82     );
  83   }
  84
  85   isAttackedByAmazon(sq, color) {
  86     return (
  87       super.isAttackedByQueen(sq, color) ||
  88       this.isAttackedBySlideNJump(
  89         sq,
  90         color,
  91         V.MARSHALL,
  92         V.steps[V.KNIGHT],
  93         "oneStep"
  94       )
  95     );
  96   }
  97
  98   isAttackedByEmpress(sq, color) {
  99     return (
 100       this.isAttackedBySlideNJump(sq, color, V.MARSHALL, V.steps[V.ROOK]) ||
 101       this.isAttackedBySlideNJump(
 102         sq,
 103         color,
 104         V.MARSHALL,
 105         V.steps[V.KNIGHT],
 106         "oneStep"
 107       )
 108     );
 109   }
 110
 111   isAttackedByPrincess(sq, color) {
 112     return (
 113       this.isAttackedBySlideNJump(sq, color, V.CARDINAL, V.steps[V.BISHOP]) ||
 114       this.isAttackedBySlideNJump(
 115         sq,
 116         color,
 117         V.CARDINAL,
 118         V.steps[V.KNIGHT],
 119         "oneStep"
 120       )
 121     );
 122   }
 123
 124   static get VALUES() {
 125     return Object.assign(
 126       { a: 12, e: 7, s: 5 }, //experimental
 127       ChessRules.VALUES
 128     );
 129   }
 130
 131   static get SEARCH_DEPTH() {
 132     return 2;
 133   }
 134
 135   static GenRandInitFen(randomness) {
 136     if (randomness == 0)
 137       return "esqakbnr/pppppppp/8/8/8/8/PPPPPPPP/ESQAKBNR w 0 ahah -";
 138
 139     let pieces = { w: new Array(8), b: new Array(8) };
 140     let flags = "";
 141     let whiteBishopPos = -1;
 142     for (let c of ["w", "b"]) {
 143       if (c == 'b' && randomness == 1) {
 144         pieces['b'] = pieces['w'];
 145         flags += flags;
 146         break;
 147       }
 148
 149       let positions = ArrayFun.range(8);
 150
 151       // Get random squares for bishop: if black, pick a different color
 152       // than where the white one stands.
 153       let randIndex =
 154         c == 'w'
 155           ? randInt(8)
 156           : 2 * randInt(4) + (1 - whiteBishopPos % 2);
 157       if (c == 'w') whiteBishopPos = randIndex;
 158       const bishopPos = positions[randIndex];
 159       positions.splice(randIndex, 1);
 160
 161       randIndex = randInt(7);
 162       const knightPos = positions[randIndex];
 163       positions.splice(randIndex, 1);
 164
 165       randIndex = randInt(6);
 166       const queenPos = positions[randIndex];
 167       positions.splice(randIndex, 1);
 168
 169       randIndex = randInt(5);
 170       const amazonPos = positions[randIndex];
 171       positions.splice(randIndex, 1);
 172
 173       randIndex = randInt(4);
 174       const princessPos = positions[randIndex];
 175       positions.splice(randIndex, 1);
 176
 177       // Rook, empress and king positions are now almost fixed,
 178       // only the ordering rook->empress or empress->rook must be decided.
 179       let rookPos = positions[0];
 180       let empressPos = positions[2];
 181       const kingPos = positions[1];
 182       flags += V.CoordToColumn(rookPos) + V.CoordToColumn(empressPos);
 183       if (Math.random() < 0.5) [rookPos, empressPos] = [empressPos, rookPos];
 184
 185       pieces[c][rookPos] = "r";
 186       pieces[c][knightPos] = "n";
 187       pieces[c][bishopPos] = "b";
 188       pieces[c][queenPos] = "q";
 189       pieces[c][kingPos] = "k";
 190       pieces[c][amazonPos] = "a";
 191       pieces[c][princessPos] = "s";
 192       pieces[c][empressPos] = "e";
 193     }
 194     // Add turn + flags + enpassant
 195     return (
 196       pieces["b"].join("") +
 197       "/pppppppp/8/8/8/8/PPPPPPPP/" +
 198       pieces["w"].join("").toUpperCase() +
 199       " w 0 " + flags + " -"
 200     );
 201   }
 202 };