| 1 | class HalfRules extends ChessRules |
| 2 | { |
| 3 | // Standard rules on a 4x8 board with no pawns |
| 4 | |
| 5 | initVariables(fen) { } //nothing to do |
| 6 | |
| 7 | setFlags(fen) |
| 8 | { |
| 9 | // No castling, hence no flags; but flags defined for compatibility |
| 10 | this.castleFlags = { "w":[false,false], "b":[false,false] }; |
| 11 | } |
| 12 | |
| 13 | static get size() { return [8,4]; } |
| 14 | |
| 15 | getPotentialKingMoves(sq) |
| 16 | { |
| 17 | const V = VariantRules; |
| 18 | // No castling |
| 19 | return this.getSlideNJumpMoves(sq, |
| 20 | V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep"); |
| 21 | } |
| 22 | |
| 23 | isAttacked(sq, colors) |
| 24 | { |
| 25 | return (this.isAttackedByRook(sq, colors) |
| 26 | || this.isAttackedByKnight(sq, colors) |
| 27 | || this.isAttackedByBishop(sq, colors) |
| 28 | || this.isAttackedByQueen(sq, colors) |
| 29 | || this.isAttackedByKing(sq, colors)); |
| 30 | } |
| 31 | |
| 32 | // Unused: |
| 33 | updateVariables(move) { } |
| 34 | unupdateVariables(move) { } |
| 35 | |
| 36 | static get SEARCH_DEPTH() { return 4; } |
| 37 | |
| 38 | static GenRandInitFen() |
| 39 | { |
| 40 | let minorPieces = { "w": new Array(4), "b": new Array(4) }; |
| 41 | let majorPieces = { "w": new Array(4), "b": new Array(4) }; |
| 42 | for (let c of ["w","b"]) |
| 43 | { |
| 44 | // Minor pieces first (on 2nd rank) |
| 45 | let positions = _.range(4); |
| 46 | |
| 47 | // Get random squares for bishops |
| 48 | let randIndex = 2 * _.random(1); |
| 49 | let bishop1Pos = positions[randIndex]; |
| 50 | let randIndex_tmp = 2 * _.random(1) + 1; |
| 51 | let bishop2Pos = positions[randIndex_tmp]; |
| 52 | positions.splice(Math.max(randIndex,randIndex_tmp), 1); |
| 53 | positions.splice(Math.min(randIndex,randIndex_tmp), 1); |
| 54 | |
| 55 | // Get random squares for knights |
| 56 | randIndex = _.random(1); |
| 57 | let knight1Pos = positions[randIndex]; |
| 58 | positions.splice(randIndex, 1); |
| 59 | let knight2Pos = positions[0]; |
| 60 | |
| 61 | minorPieces[c][bishop1Pos] = 'b'; |
| 62 | minorPieces[c][bishop2Pos] = 'b'; |
| 63 | minorPieces[c][knight1Pos] = 'n'; |
| 64 | minorPieces[c][knight2Pos] = 'n'; |
| 65 | |
| 66 | // Major pieces then (on 1st rank) |
| 67 | positions = _.range(4); |
| 68 | |
| 69 | // Get random square for queen |
| 70 | randIndex = _.random(3); |
| 71 | let queenPos = positions[randIndex]; |
| 72 | positions.splice(randIndex, 1); |
| 73 | |
| 74 | // Rooks and king positions: |
| 75 | let rook1Pos = positions[0]; |
| 76 | let kingPos = positions[1]; |
| 77 | let rook2Pos = positions[2]; |
| 78 | |
| 79 | majorPieces[c][rook1Pos] = 'r'; |
| 80 | majorPieces[c][rook2Pos] = 'r'; |
| 81 | majorPieces[c][kingPos] = 'k'; |
| 82 | majorPieces[c][queenPos] = 'q'; |
| 83 | } |
| 84 | return majorPieces["b"].join("") + "/" + minorPieces["b"].join("") + "/4/4/4/4/" + |
| 85 | minorPieces["w"].join("").toUpperCase() + "/" + |
| 86 | majorPieces["w"].join("").toUpperCase() + " 0000"; //TODO: flags?! |
| 87 | } |
| 88 | } |