| 1 | import { ChessRules, PiPo, Move } from "@/base_rules"; |
| 2 | |
| 3 | export const VariantRules = class AntimatterRules extends ChessRules { |
| 4 | getBasicMove([sx, sy], [ex, ey]) { |
| 5 | const startColor = this.getColor(sx, sy); |
| 6 | const startPiece = this.getPiece(sx, sy); |
| 7 | let mv = new Move({ |
| 8 | appear: [ |
| 9 | new PiPo({ |
| 10 | x: ex, |
| 11 | y: ey, |
| 12 | c: startColor, |
| 13 | p: startPiece |
| 14 | }) |
| 15 | ], |
| 16 | vanish: [ |
| 17 | new PiPo({ |
| 18 | x: sx, |
| 19 | y: sy, |
| 20 | c: startColor, |
| 21 | p: startPiece |
| 22 | }) |
| 23 | ] |
| 24 | }); |
| 25 | |
| 26 | if (this.board[ex][ey] != V.EMPTY) { |
| 27 | const endColor = this.getColor(ex, ey); |
| 28 | const endPiece = this.getPiece(ex, ey); |
| 29 | mv.vanish.push( |
| 30 | new PiPo({ |
| 31 | x: ex, |
| 32 | y: ey, |
| 33 | c: endColor, |
| 34 | p: endPiece |
| 35 | }) |
| 36 | ); |
| 37 | mv.appear.push( |
| 38 | new PiPo({ |
| 39 | x: sx, |
| 40 | y: sy, |
| 41 | c: endColor, |
| 42 | p: endPiece |
| 43 | }) |
| 44 | ); |
| 45 | } |
| 46 | return mv; |
| 47 | } |
| 48 | |
| 49 | getPotentialPawnMoves([x, y]) { |
| 50 | const color = this.turn; |
| 51 | let moves = []; |
| 52 | const [sizeX, sizeY] = [V.size.x, V.size.y]; |
| 53 | const shiftX = color == "w" ? -1 : 1; |
| 54 | const startRank = color == "w" ? sizeX - 2 : 1; |
| 55 | const firstRank = color == "w" ? sizeX - 1 : 0; |
| 56 | |
| 57 | if (x + shiftX >= 0 && x + shiftX < sizeX) { |
| 58 | // One square forward |
| 59 | if (this.board[x + shiftX][y] == V.EMPTY) { |
| 60 | moves.push( |
| 61 | this.getBasicMove([x, y], [x + shiftX, y], { |
| 62 | c: color, |
| 63 | p: "p" |
| 64 | }) |
| 65 | ); |
| 66 | if ( |
| 67 | [startRank,firstRank].includes(x) && |
| 68 | this.board[x + 2 * shiftX][y] == V.EMPTY |
| 69 | ) { |
| 70 | // Two squares jump |
| 71 | moves.push(this.getBasicMove([x, y], [x + 2 * shiftX, y])); |
| 72 | } |
| 73 | } |
| 74 | // Swaps |
| 75 | for (let shiftY of [-1, 1]) { |
| 76 | if ( |
| 77 | y + shiftY >= 0 && |
| 78 | y + shiftY < sizeY && |
| 79 | this.board[x + shiftX][y + shiftY] != V.EMPTY && |
| 80 | this.canTake([x, y], [x + shiftX, y + shiftY]) |
| 81 | ) { |
| 82 | moves.push( |
| 83 | this.getBasicMove([x, y], [x + shiftX, y + shiftY], { |
| 84 | c: color, |
| 85 | p: "p" |
| 86 | }) |
| 87 | ); |
| 88 | } |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | // En passant |
| 93 | const Lep = this.epSquares.length; |
| 94 | const epSquare = this.epSquares[Lep - 1]; //always at least one element |
| 95 | if ( |
| 96 | !!epSquare && |
| 97 | epSquare.x == x + shiftX && |
| 98 | Math.abs(epSquare.y - y) == 1 |
| 99 | ) { |
| 100 | let enpassantMove = this.getBasicMove([x, y], [epSquare.x, epSquare.y]); |
| 101 | const oppCol = V.GetOppCol(color); |
| 102 | enpassantMove.vanish.push({ |
| 103 | x: x, |
| 104 | y: epSquare.y, |
| 105 | p: "p", |
| 106 | c: oppCol |
| 107 | }); |
| 108 | enpassantMove.appear.push({ |
| 109 | x: x, |
| 110 | y: y, |
| 111 | p: "p", |
| 112 | c: oppCol |
| 113 | }); |
| 114 | moves.push(enpassantMove); |
| 115 | } |
| 116 | |
| 117 | return moves; |
| 118 | } |
| 119 | |
| 120 | getPotentialKingMoves() { |
| 121 | return []; |
| 122 | } |
| 123 | |
| 124 | updateVariables(move) { |
| 125 | super.updateVariables(move); |
| 126 | if (move.vanish.length == 2) { |
| 127 | // Was opponent king swapped? |
| 128 | if (move.vanish[1].p == V.KING) |
| 129 | this.kingPos[this.turn] = [move.appear[1].x, move.appear[1].y]; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | unupdateVariables(move) { |
| 134 | super.unupdateVariables(move); |
| 135 | if (move.appear.length == 2) { |
| 136 | // Was opponent king swapped? |
| 137 | if (move.appear[1].p == V.KING) |
| 138 | this.kingPos[move.vanish[1].c] = [move.vanish[1].x,move.vanish[1].y]; |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | atLeastOneMove() { |
| 143 | return true; |
| 144 | } |
| 145 | |
| 146 | filterValid(moves) { |
| 147 | return moves; |
| 148 | } |
| 149 | |
| 150 | getCheckSquares() { |
| 151 | return []; |
| 152 | } |
| 153 | |
| 154 | getCurrentScore() { |
| 155 | const color = this.turn; |
| 156 | const kp = this.kingPos[color]; |
| 157 | if (color == "w" && kp[0] == 0) |
| 158 | return "0-1"; |
| 159 | if (color == "b" && kp[0] == V.size.x - 1) |
| 160 | return "1-0"; |
| 161 | // King is not on the opposite edge: game not over |
| 162 | return "*"; |
| 163 | } |
| 164 | |
| 165 | evalPosition() { |
| 166 | // Very simple criterion for now: kings position |
| 167 | return this.kingPos["w"][0] + this.kingPos["b"][0]; |
| 168 | } |
| 169 | }; |