| | | 1 | | using Rudim.Common; |
| | | 2 | | |
| | | 3 | | namespace Rudim.Board |
| | | 4 | | { |
| | | 5 | | public static class PieceSquareTableEvaluation |
| | | 6 | | { |
| | | 7 | | private static readonly int[,] MidGamePositions; |
| | | 8 | | private static readonly int[,] EndGamePositions; |
| | | 9 | | |
| | | 10 | | |
| | | 11 | | public static int Evaluate(BoardState boardState) |
| | | 12 | | { |
| | 4303257 | 13 | | int score = 0; |
| | | 14 | | |
| | 4303257 | 15 | | score += ScorePosition(boardState); |
| | | 16 | | |
| | 4303257 | 17 | | return boardState.SideToMove == Side.White ? score : -score; |
| | | 18 | | } |
| | | 19 | | |
| | | 20 | | private static int ScorePosition(BoardState boardState) |
| | | 21 | | { |
| | 4303257 | 22 | | int positionalScore = 0; |
| | 4303257 | 23 | | int midGamePhase = boardState.ClippedPhase; |
| | 4303257 | 24 | | int endGamePhase = GamePhase.TotalPhase - midGamePhase; |
| | 60245598 | 25 | | for (int piece = 0; piece < Constants.Pieces; ++piece) |
| | | 26 | | { |
| | 25819542 | 27 | | Bitboard whiteBoard = new(boardState.Pieces[(int)Side.White, piece].Board); |
| | 25819542 | 28 | | Bitboard blackBoard = new(boardState.Pieces[(int)Side.Black, piece].Board); |
| | | 29 | | |
| | 81044305 | 30 | | while (whiteBoard.Board > 0) |
| | | 31 | | { |
| | 55224763 | 32 | | int square = whiteBoard.GetLsb(); |
| | 55224763 | 33 | | whiteBoard.ClearBit(square); |
| | 55224763 | 34 | | positionalScore += (MidGamePositions[piece, square] * midGamePhase) + (EndGamePositions[piece, squar |
| | | 35 | | } |
| | | 36 | | |
| | 80200311 | 37 | | while (blackBoard.Board > 0) |
| | | 38 | | { |
| | 54380769 | 39 | | int square = blackBoard.GetLsb(); |
| | 54380769 | 40 | | blackBoard.ClearBit(square); |
| | 54380769 | 41 | | square = MirrorSquare(square); |
| | 54380769 | 42 | | positionalScore -= (MidGamePositions[piece, square] * midGamePhase) + (EndGamePositions[piece, squa |
| | | 43 | | } |
| | | 44 | | } |
| | | 45 | | |
| | 4303257 | 46 | | positionalScore = (int)(positionalScore * GamePhase.PhaseFactor); |
| | 4303257 | 47 | | return positionalScore; |
| | | 48 | | } |
| | | 49 | | |
| | | 50 | | private static int MirrorSquare(int square) |
| | | 51 | | { |
| | 54380769 | 52 | | int row = square >> 3; // Square / 8 |
| | 54380769 | 53 | | int col = square & (8 - 1); // Square % 8 |
| | | 54 | | |
| | 54380769 | 55 | | return ((7 - row) << 3) + col; // (7 - Row) * 8 + col |
| | | 56 | | } |
| | | 57 | | |
| | | 58 | | static PieceSquareTableEvaluation() |
| | | 59 | | { |
| | 1 | 60 | | int[] midGamePieceValues = [82, 337, 365, 477, 1025, 0]; |
| | 1 | 61 | | int[] endGamePieceValues = [94, 281, 297, 512, 936, 0]; |
| | | 62 | | |
| | | 63 | | // Values borrowed from Rofchade |
| | | 64 | | // http://www.talkchess.com/forum3/viewtopic.php?f=2&t=68311&start=19 |
| | 1 | 65 | | MidGamePositions = new[,] |
| | 1 | 66 | | { |
| | 1 | 67 | | // Pawn |
| | 1 | 68 | | { |
| | 1 | 69 | | 0, 0, 0, 0, 0, 0, 0, 0, |
| | 1 | 70 | | 98, 134, 61, 95, 68, 126, 34, -11, |
| | 1 | 71 | | -6, 7, 26, 31, 65, 56, 25, -20, |
| | 1 | 72 | | -14, 13, 6, 21, 23, 12, 17, -23, |
| | 1 | 73 | | -27, -2, -5, 12, 17, 6, 10, -25, |
| | 1 | 74 | | -26, -4, -4, -10, 3, 3, 33, -12, |
| | 1 | 75 | | -35, -1, -20, -23, -15, 24, 38, -22, |
| | 1 | 76 | | 0, 0, 0, 0, 0, 0, 0, 0 |
| | 1 | 77 | | }, |
| | 1 | 78 | | // Knight |
| | 1 | 79 | | { |
| | 1 | 80 | | -167, -89, -34, -49, 61, -97, -15, -107, |
| | 1 | 81 | | -73, -41, 72, 36, 23, 62, 7, -17, |
| | 1 | 82 | | -47, 60, 37, 65, 84, 129, 73, 44, |
| | 1 | 83 | | -9, 17, 19, 53, 37, 69, 18, 22, |
| | 1 | 84 | | -13, 4, 16, 13, 28, 19, 21, -8, |
| | 1 | 85 | | -23, -9, 12, 10, 19, 17, 25, -16, |
| | 1 | 86 | | -29, -53, -12, -3, -1, 18, -14, -19, |
| | 1 | 87 | | -105, -21, -58, -33, -17, -28, -19, -23, |
| | 1 | 88 | | }, |
| | 1 | 89 | | // Bishop |
| | 1 | 90 | | { |
| | 1 | 91 | | -29, 4, -82, -37, -25, -42, 7, -8, |
| | 1 | 92 | | -26, 16, -18, -13, 30, 59, 18, -47, |
| | 1 | 93 | | -16, 37, 43, 40, 35, 50, 37, -2, |
| | 1 | 94 | | -4, 5, 19, 50, 37, 37, 7, -2, |
| | 1 | 95 | | -6, 13, 13, 26, 34, 12, 10, 4, |
| | 1 | 96 | | 0, 15, 15, 15, 14, 27, 18, 10, |
| | 1 | 97 | | 4, 15, 16, 0, 7, 21, 33, 1, |
| | 1 | 98 | | -33, -3, -14, -21, -13, -12, -39, -21, |
| | 1 | 99 | | }, |
| | 1 | 100 | | // Rook |
| | 1 | 101 | | { |
| | 1 | 102 | | 32, 42, 32, 51, 63, 9, 31, 43, |
| | 1 | 103 | | 27, 32, 58, 62, 80, 67, 26, 44, |
| | 1 | 104 | | -5, 19, 26, 36, 17, 45, 61, 16, |
| | 1 | 105 | | -24, -11, 7, 26, 24, 35, -8, -20, |
| | 1 | 106 | | -36, -26, -12, -1, 9, -7, 6, -23, |
| | 1 | 107 | | -45, -25, -16, -17, 3, 0, -5, -33, |
| | 1 | 108 | | -44, -16, -20, -9, -1, 11, -6, -71, |
| | 1 | 109 | | -19, -13, 1, 17, 16, 7, -37, -26, |
| | 1 | 110 | | }, |
| | 1 | 111 | | // Queen |
| | 1 | 112 | | { |
| | 1 | 113 | | -28, 0, 29, 12, 59, 44, 43, 45, |
| | 1 | 114 | | -24, -39, -5, 1, -16, 57, 28, 54, |
| | 1 | 115 | | -13, -17, 7, 8, 29, 56, 47, 57, |
| | 1 | 116 | | -27, -27, -16, -16, -1, 17, -2, 1, |
| | 1 | 117 | | -9, -26, -9, -10, -2, -4, 3, -3, |
| | 1 | 118 | | -14, 2, -11, -2, -5, 2, 14, 5, |
| | 1 | 119 | | -35, -8, 11, 2, 8, 15, -3, 1, |
| | 1 | 120 | | -1, -18, -9, 10, -15, -25, -31, -50, |
| | 1 | 121 | | }, |
| | 1 | 122 | | // King |
| | 1 | 123 | | { |
| | 1 | 124 | | -65, 23, 16, -15, -56, -34, 2, 13, |
| | 1 | 125 | | 29, -1, -20, -7, -8, -4, -38, -29, |
| | 1 | 126 | | -9, 24, 2, -16, -20, 6, 22, -22, |
| | 1 | 127 | | -17, -20, -12, -27, -30, -25, -14, -36, |
| | 1 | 128 | | -49, -1, -27, -39, -46, -44, -33, -51, |
| | 1 | 129 | | -14, -14, -22, -46, -44, -30, -15, -27, |
| | 1 | 130 | | 1, 7, -8, -64, -43, -16, 9, 8, |
| | 1 | 131 | | -15, 36, 12, -54, 8, -28, 24, 14, |
| | 1 | 132 | | } |
| | 1 | 133 | | }; |
| | | 134 | | |
| | 1 | 135 | | EndGamePositions = new[,] |
| | 1 | 136 | | { |
| | 1 | 137 | | // Pawn |
| | 1 | 138 | | { |
| | 1 | 139 | | 0, 0, 0, 0, 0, 0, 0, 0, |
| | 1 | 140 | | 178, 173, 158, 134, 147, 132, 165, 187, |
| | 1 | 141 | | 94, 100, 85, 67, 56, 53, 82, 84, |
| | 1 | 142 | | 32, 24, 13, 5, -2, 4, 17, 17, |
| | 1 | 143 | | 13, 9, -3, -7, -7, -8, 3, -1, |
| | 1 | 144 | | 4, 7, -6, 1, 0, -5, -1, -8, |
| | 1 | 145 | | 13, 8, 8, 10, 13, 0, 2, -7, |
| | 1 | 146 | | 0, 0, 0, 0, 0, 0, 0, 0, |
| | 1 | 147 | | }, |
| | 1 | 148 | | // Knight |
| | 1 | 149 | | { |
| | 1 | 150 | | -58, -38, -13, -28, -31, -27, -63, -99, |
| | 1 | 151 | | -25, -8, -25, -2, -9, -25, -24, -52, |
| | 1 | 152 | | -24, -20, 10, 9, -1, -9, -19, -41, |
| | 1 | 153 | | -17, 3, 22, 22, 22, 11, 8, -18, |
| | 1 | 154 | | -18, -6, 16, 25, 16, 17, 4, -18, |
| | 1 | 155 | | -23, -3, -1, 15, 10, -3, -20, -22, |
| | 1 | 156 | | -42, -20, -10, -5, -2, -20, -23, -44, |
| | 1 | 157 | | -29, -51, -23, -15, -22, -18, -50, -64, |
| | 1 | 158 | | }, |
| | 1 | 159 | | // Bishop |
| | 1 | 160 | | { |
| | 1 | 161 | | -14, -21, -11, -8, -7, -9, -17, -24, |
| | 1 | 162 | | -8, -4, 7, -12, -3, -13, -4, -14, |
| | 1 | 163 | | 2, -8, 0, -1, -2, 6, 0, 4, |
| | 1 | 164 | | -3, 9, 12, 9, 14, 10, 3, 2, |
| | 1 | 165 | | -6, 3, 13, 19, 7, 10, -3, -9, |
| | 1 | 166 | | -12, -3, 8, 10, 13, 3, -7, -15, |
| | 1 | 167 | | -14, -18, -7, -1, 4, -9, -15, -27, |
| | 1 | 168 | | -23, -9, -23, -5, -9, -16, -5, -17, |
| | 1 | 169 | | }, |
| | 1 | 170 | | // Rook |
| | 1 | 171 | | { |
| | 1 | 172 | | 13, 10, 18, 15, 12, 12, 8, 5, |
| | 1 | 173 | | 11, 13, 13, 11, -3, 3, 8, 3, |
| | 1 | 174 | | 7, 7, 7, 5, 4, -3, -5, -3, |
| | 1 | 175 | | 4, 3, 13, 1, 2, 1, -1, 2, |
| | 1 | 176 | | 3, 5, 8, 4, -5, -6, -8, -11, |
| | 1 | 177 | | -4, 0, -5, -1, -7, -12, -8, -16, |
| | 1 | 178 | | -6, -6, 0, 2, -9, -9, -11, -3, |
| | 1 | 179 | | -9, 2, 3, -1, -5, -13, 4, -20, |
| | 1 | 180 | | }, |
| | 1 | 181 | | // Queen |
| | 1 | 182 | | { |
| | 1 | 183 | | -9, 22, 22, 27, 27, 19, 10, 20, |
| | 1 | 184 | | -17, 20, 32, 41, 58, 25, 30, 0, |
| | 1 | 185 | | -20, 6, 9, 49, 47, 35, 19, 9, |
| | 1 | 186 | | 3, 22, 24, 45, 57, 40, 57, 36, |
| | 1 | 187 | | -18, 28, 19, 47, 31, 34, 39, 23, |
| | 1 | 188 | | -16, -27, 15, 6, 9, 17, 10, 5, |
| | 1 | 189 | | -22, -23, -30, -16, -16, -23, -36, -32, |
| | 1 | 190 | | -33, -28, -22, -43, -5, -32, -20, -41, |
| | 1 | 191 | | }, |
| | 1 | 192 | | // King |
| | 1 | 193 | | { |
| | 1 | 194 | | -74, -35, -18, -18, -11, 15, 4, -17, |
| | 1 | 195 | | -12, 17, 14, 17, 17, 38, 23, 11, |
| | 1 | 196 | | 10, 17, 23, 15, 20, 45, 44, 13, |
| | 1 | 197 | | -8, 22, 24, 27, 26, 33, 26, 3, |
| | 1 | 198 | | -18, -4, 21, 24, 27, 23, 9, -11, |
| | 1 | 199 | | -19, -3, 11, 21, 23, 16, 7, -9, |
| | 1 | 200 | | -27, -11, 4, 13, 14, 4, -5, -17, |
| | 1 | 201 | | -53, -34, -21, -11, -28, -14, -24, -43 |
| | 1 | 202 | | } |
| | 1 | 203 | | }; |
| | | 204 | | |
| | 14 | 205 | | for (int piece = 0; piece < Constants.Pieces; ++piece) |
| | | 206 | | { |
| | 780 | 207 | | for (int square = 0; square < Constants.Squares; ++square) |
| | | 208 | | { |
| | 384 | 209 | | MidGamePositions[piece, square] += midGamePieceValues[piece]; |
| | 384 | 210 | | EndGamePositions[piece, square] += endGamePieceValues[piece]; |
| | | 211 | | } |
| | | 212 | | } |
| | 1 | 213 | | } |
| | | 214 | | } |
| | | 215 | | } |