| 1 | class AntikingRules extends ChessRules |
| 2 | { |
| 3 | static getPpath(b) |
| 4 | { |
| 5 | return b[1]=='a' ? "Antiking/"+b : b; |
| 6 | } |
| 7 | |
| 8 | static get ANTIKING() { return 'a'; } |
| 9 | |
| 10 | initVariables(fen) |
| 11 | { |
| 12 | super.initVariables(fen); |
| 13 | this.antikingPos = {'w':[-1,-1], 'b':[-1,-1]}; |
| 14 | const position = fen.split(" ")[0].split("/"); |
| 15 | for (let i=0; i<position.length; i++) |
| 16 | { |
| 17 | let k = 0; |
| 18 | for (let j=0; j<position[i].length; j++) |
| 19 | { |
| 20 | switch (position[i].charAt(j)) |
| 21 | { |
| 22 | case 'a': |
| 23 | this.antikingPos['b'] = [i,k]; |
| 24 | break; |
| 25 | case 'A': |
| 26 | this.antikingPos['w'] = [i,k]; |
| 27 | break; |
| 28 | default: |
| 29 | let num = parseInt(position[i].charAt(j)); |
| 30 | if (!isNaN(num)) |
| 31 | k += (num-1); |
| 32 | } |
| 33 | k++; |
| 34 | } |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | canTake([x1,y1], [x2,y2]) |
| 39 | { |
| 40 | const piece1 = this.getPiece(x1,y1); |
| 41 | const piece2 = this.getPiece(x2,y2); |
| 42 | const color1 = this.getColor(x1,y1); |
| 43 | const color2 = this.getColor(x2,y2); |
| 44 | return piece2 != "a" && |
| 45 | ((piece1 != "a" && color1 != color2) || (piece1 == "a" && color1 == color2)); |
| 46 | } |
| 47 | |
| 48 | getPotentialMovesFrom([x,y]) |
| 49 | { |
| 50 | switch (this.getPiece(x,y)) |
| 51 | { |
| 52 | case VariantRules.ANTIKING: |
| 53 | return this.getPotentialAntikingMoves([x,y]); |
| 54 | default: |
| 55 | return super.getPotentialMovesFrom([x,y]); |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | getPotentialAntikingMoves(sq) |
| 60 | { |
| 61 | const V = VariantRules; |
| 62 | return this.getSlideNJumpMoves(sq, |
| 63 | V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep"); |
| 64 | } |
| 65 | |
| 66 | isAttacked(sq, colors) |
| 67 | { |
| 68 | return (super.isAttacked(sq, colors) || this.isAttackedByAntiking(sq, colors)); |
| 69 | } |
| 70 | |
| 71 | isAttackedByKing([x,y], colors) |
| 72 | { |
| 73 | const V = VariantRules; |
| 74 | if (this.getPiece(x,y) == V.ANTIKING) |
| 75 | return false; //antiking is not attacked by king |
| 76 | return this.isAttackedBySlideNJump([x,y], colors, V.KING, |
| 77 | V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep"); |
| 78 | } |
| 79 | |
| 80 | isAttackedByAntiking([x,y], colors) |
| 81 | { |
| 82 | const V = VariantRules; |
| 83 | if ([V.KING,V.ANTIKING].includes(this.getPiece(x,y))) |
| 84 | return false; //(anti)king is not attacked by antiking |
| 85 | return this.isAttackedBySlideNJump([x,y], colors, V.ANTIKING, |
| 86 | V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep"); |
| 87 | } |
| 88 | |
| 89 | underCheck(move) |
| 90 | { |
| 91 | const c = this.turn; |
| 92 | const oppCol = this.getOppCol(c); |
| 93 | this.play(move) |
| 94 | let res = this.isAttacked(this.kingPos[c], [oppCol]) |
| 95 | || !this.isAttacked(this.antikingPos[c], [oppCol]); |
| 96 | this.undo(move); |
| 97 | return res; |
| 98 | } |
| 99 | |
| 100 | getCheckSquares(move) |
| 101 | { |
| 102 | let res = super.getCheckSquares(move); |
| 103 | this.play(move); |
| 104 | const c = this.turn; |
| 105 | if (!this.isAttacked(this.antikingPos[c], [this.getOppCol(c)])) |
| 106 | res.push(JSON.parse(JSON.stringify(this.antikingPos[c]))); |
| 107 | this.undo(move); |
| 108 | return res; |
| 109 | } |
| 110 | |
| 111 | updateVariables(move) |
| 112 | { |
| 113 | super.updateVariables(move); |
| 114 | const piece = this.getPiece(move.start.x,move.start.y); |
| 115 | const c = this.getColor(move.start.x,move.start.y); |
| 116 | // Update antiking position |
| 117 | if (piece == VariantRules.ANTIKING) |
| 118 | { |
| 119 | this.antikingPos[c][0] = move.appear[0].x; |
| 120 | this.antikingPos[c][1] = move.appear[0].y; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | unupdateVariables(move) |
| 125 | { |
| 126 | super.unupdateVariables(move); |
| 127 | const c = this.getColor(move.start.x,move.start.y); |
| 128 | if (this.getPiece(move.start.x,move.start.y) == VariantRules.ANTIKING) |
| 129 | this.antikingPos[c] = [move.start.x, move.start.y]; |
| 130 | } |
| 131 | |
| 132 | checkGameEnd() |
| 133 | { |
| 134 | const color = this.turn; |
| 135 | const oppCol = this.getOppCol(color); |
| 136 | if (!this.isAttacked(this.kingPos[color], [oppCol]) |
| 137 | && this.isAttacked(this.antikingPos[color], [oppCol])) |
| 138 | { |
| 139 | return "1/2"; |
| 140 | } |
| 141 | return color == "w" ? "0-1" : "1-0"; |
| 142 | } |
| 143 | |
| 144 | static get VALUES() { |
| 145 | return Object.assign( |
| 146 | ChessRules.VALUES, |
| 147 | { 'a': 1000 } |
| 148 | ); |
| 149 | } |
| 150 | |
| 151 | static GenRandInitFen() |
| 152 | { |
| 153 | let pieces = { "w": new Array(8), "b": new Array(8) }; |
| 154 | let antikingPos = { "w": -1, "b": -1 }; |
| 155 | for (let c of ["w","b"]) |
| 156 | { |
| 157 | let positions = _.range(8); |
| 158 | |
| 159 | // Get random squares for bishops, but avoid corners; because, |
| 160 | // if an antiking blocks a cornered bishop, it can never be checkmated |
| 161 | let randIndex = 2 * _.random(1,3); |
| 162 | const bishop1Pos = positions[randIndex]; |
| 163 | let randIndex_tmp = 2 * _.random(2) + 1; |
| 164 | const bishop2Pos = positions[randIndex_tmp]; |
| 165 | positions.splice(Math.max(randIndex,randIndex_tmp), 1); |
| 166 | positions.splice(Math.min(randIndex,randIndex_tmp), 1); |
| 167 | |
| 168 | randIndex = _.random(5); |
| 169 | const knight1Pos = positions[randIndex]; |
| 170 | positions.splice(randIndex, 1); |
| 171 | randIndex = _.random(4); |
| 172 | const knight2Pos = positions[randIndex]; |
| 173 | positions.splice(randIndex, 1); |
| 174 | |
| 175 | randIndex = _.random(3); |
| 176 | const queenPos = positions[randIndex]; |
| 177 | positions.splice(randIndex, 1); |
| 178 | |
| 179 | const rook1Pos = positions[0]; |
| 180 | const kingPos = positions[1]; |
| 181 | const rook2Pos = positions[2]; |
| 182 | |
| 183 | // Random squares for antikings |
| 184 | antikingPos[c] = _.random(7); |
| 185 | |
| 186 | pieces[c][rook1Pos] = 'r'; |
| 187 | pieces[c][knight1Pos] = 'n'; |
| 188 | pieces[c][bishop1Pos] = 'b'; |
| 189 | pieces[c][queenPos] = 'q'; |
| 190 | pieces[c][kingPos] = 'k'; |
| 191 | pieces[c][bishop2Pos] = 'b'; |
| 192 | pieces[c][knight2Pos] = 'n'; |
| 193 | pieces[c][rook2Pos] = 'r'; |
| 194 | } |
| 195 | const ranks23_black = "pppppppp/" + (antikingPos["w"]>0?antikingPos["w"]:"") |
| 196 | + "A" + (antikingPos["w"]<7?7-antikingPos["w"]:""); |
| 197 | const ranks23_white = (antikingPos["b"]>0?antikingPos["b"]:"") + "a" |
| 198 | + (antikingPos["b"]<7?7-antikingPos["b"]:"") + "/PPPPPPPP"; |
| 199 | let fen = pieces["b"].join("") + "/" + ranks23_black + |
| 200 | "/8/8/" + |
| 201 | ranks23_white + "/" + pieces["w"].join("").toUpperCase() + |
| 202 | " 1111"; |
| 203 | return fen; |
| 204 | } |
| 205 | } |