| 1 | import { ChessRules, PiPo, Move } from "@/base_rules"; |
| 2 | import { ArrayFun } from "@/utils/array"; |
| 3 | import { randInt, shuffle } from "@/utils/alea"; |
| 4 | |
| 5 | export const VariantRules = class CylinderRules extends ChessRules { |
| 6 | // Output basically x % 8 (circular board) |
| 7 | static ComputeY(y) { |
| 8 | let res = y % V.size.y; |
| 9 | if (res < 0) |
| 10 | res += V.size.y; |
| 11 | return res; |
| 12 | } |
| 13 | |
| 14 | getSlideNJumpMoves([x, y], steps, oneStep) { |
| 15 | let moves = []; |
| 16 | outerLoop: for (let step of steps) { |
| 17 | let i = x + step[0]; |
| 18 | let j = V.ComputeY(y + step[1]); |
| 19 | while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) { |
| 20 | moves.push(this.getBasicMove([x, y], [i, j])); |
| 21 | if (oneStep !== undefined) continue outerLoop; |
| 22 | i += step[0]; |
| 23 | j = V.ComputeY(j + step[1]); |
| 24 | } |
| 25 | if (V.OnBoard(i, j) && this.canTake([x, y], [i, j])) |
| 26 | moves.push(this.getBasicMove([x, y], [i, j])); |
| 27 | } |
| 28 | return moves; |
| 29 | } |
| 30 | |
| 31 | getPotentialPawnMoves([x, y]) { |
| 32 | const color = this.turn; |
| 33 | let moves = []; |
| 34 | const [sizeX, sizeY] = [V.size.x, V.size.y]; |
| 35 | const shiftX = color == "w" ? -1 : 1; |
| 36 | const startRank = color == "w" ? sizeX - 2 : 1; |
| 37 | const lastRank = color == "w" ? 0 : sizeX - 1; |
| 38 | |
| 39 | const finalPieces = |
| 40 | x + shiftX == lastRank |
| 41 | ? [V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN] |
| 42 | : [V.PAWN]; |
| 43 | if (this.board[x + shiftX][y] == V.EMPTY) { |
| 44 | // One square forward |
| 45 | for (let piece of finalPieces) { |
| 46 | moves.push( |
| 47 | this.getBasicMove([x, y], [x + shiftX, y], { |
| 48 | c: color, |
| 49 | p: piece |
| 50 | }) |
| 51 | ); |
| 52 | } |
| 53 | if ( |
| 54 | x == startRank && |
| 55 | this.board[x + 2 * shiftX][y] == V.EMPTY |
| 56 | ) { |
| 57 | // Two squares jump |
| 58 | moves.push(this.getBasicMove([x, y], [x + 2 * shiftX, y])); |
| 59 | } |
| 60 | } |
| 61 | // Captures |
| 62 | for (let shiftY of [-1, 1]) { |
| 63 | const nextFile = V.ComputeY(y + shiftY); |
| 64 | if ( |
| 65 | this.board[x + shiftX][nextFile] != V.EMPTY && |
| 66 | this.canTake([x, y], [x + shiftX, nextFile]) |
| 67 | ) { |
| 68 | for (let piece of finalPieces) { |
| 69 | moves.push( |
| 70 | this.getBasicMove([x, y], [x + shiftX, nextFile], { |
| 71 | c: color, |
| 72 | p: piece |
| 73 | }) |
| 74 | ); |
| 75 | } |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | // En passant |
| 80 | const Lep = this.epSquares.length; |
| 81 | const epSquare = this.epSquares[Lep - 1]; //always at least one element |
| 82 | if ( |
| 83 | !!epSquare && |
| 84 | epSquare.x == x + shiftX && |
| 85 | Math.abs( (epSquare.y - y) % V.size.y ) == 1 |
| 86 | ) { |
| 87 | let enpassantMove = this.getBasicMove([x, y], [epSquare.x, epSquare.y]); |
| 88 | enpassantMove.vanish.push({ |
| 89 | x: x, |
| 90 | y: epSquare.y, |
| 91 | p: "p", |
| 92 | c: this.getColor(x, epSquare.y) |
| 93 | }); |
| 94 | moves.push(enpassantMove); |
| 95 | } |
| 96 | |
| 97 | return moves; |
| 98 | } |
| 99 | |
| 100 | isAttackedByPawn([x, y], colors) { |
| 101 | for (let c of colors) { |
| 102 | let pawnShift = c == "w" ? 1 : -1; |
| 103 | if (x + pawnShift >= 0 && x + pawnShift < V.size.x) { |
| 104 | for (let i of [-1, 1]) { |
| 105 | const nextFile = V.ComputeY(y + i); |
| 106 | if ( |
| 107 | this.getPiece(x + pawnShift, nextFile) == V.PAWN && |
| 108 | this.getColor(x + pawnShift, nextFile) == c |
| 109 | ) { |
| 110 | return true; |
| 111 | } |
| 112 | } |
| 113 | } |
| 114 | } |
| 115 | return false; |
| 116 | } |
| 117 | |
| 118 | isAttackedBySlideNJump([x, y], colors, piece, steps, oneStep) { |
| 119 | for (let step of steps) { |
| 120 | let rx = x + step[0], |
| 121 | ry = V.ComputeY(y + step[1]); |
| 122 | while (V.OnBoard(rx, ry) && this.board[rx][ry] == V.EMPTY && !oneStep) { |
| 123 | rx += step[0]; |
| 124 | ry = V.ComputeY(ry + step[1]); |
| 125 | } |
| 126 | if ( |
| 127 | V.OnBoard(rx, ry) && |
| 128 | this.getPiece(rx, ry) === piece && |
| 129 | colors.includes(this.getColor(rx, ry)) |
| 130 | ) { |
| 131 | return true; |
| 132 | } |
| 133 | } |
| 134 | return false; |
| 135 | } |
| 136 | |
| 137 | static get VALUES() { |
| 138 | return { |
| 139 | p: 1, |
| 140 | r: 5, |
| 141 | n: 3, |
| 142 | b: 4, |
| 143 | q: 10, |
| 144 | k: 1000 |
| 145 | }; |
| 146 | } |
| 147 | }; |