132 lines
4.8 KiB
C++
132 lines
4.8 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2021 The Stockfish developers (see AUTHORS file)
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "psqt.h"
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#include <algorithm>
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#include "bitboard.h"
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#include "types.h"
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namespace Stockfish {
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namespace
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{
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auto constexpr S = make_score;
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// 'Bonus' contains Piece-Square parameters.
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// Scores are explicit for files A to D, implicitly mirrored for E to H.
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constexpr Score Bonus[][RANK_NB][int(FILE_NB) / 2] = {
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{ },
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{ },
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{ // Knight
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{ S(-175, -96), S(-92,-65), S(-74,-49), S(-73,-21) },
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{ S( -77, -67), S(-41,-54), S(-27,-18), S(-15, 8) },
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{ S( -61, -40), S(-17,-27), S( 6, -8), S( 12, 29) },
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{ S( -35, -35), S( 8, -2), S( 40, 13), S( 49, 28) },
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{ S( -34, -45), S( 13,-16), S( 44, 9), S( 51, 39) },
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{ S( -9, -51), S( 22,-44), S( 58,-16), S( 53, 17) },
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{ S( -67, -69), S(-27,-50), S( 4,-51), S( 37, 12) },
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{ S(-201,-100), S(-83,-88), S(-56,-56), S(-26,-17) }
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},
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{ // Bishop
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{ S(-37,-40), S(-4 ,-21), S( -6,-26), S(-16, -8) },
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{ S(-11,-26), S( 6, -9), S( 13,-12), S( 3, 1) },
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{ S(-5 ,-11), S( 15, -1), S( -4, -1), S( 12, 7) },
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{ S(-4 ,-14), S( 8, -4), S( 18, 0), S( 27, 12) },
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{ S(-8 ,-12), S( 20, -1), S( 15,-10), S( 22, 11) },
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{ S(-11,-21), S( 4, 4), S( 1, 3), S( 8, 4) },
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{ S(-12,-22), S(-10,-14), S( 4, -1), S( 0, 1) },
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{ S(-34,-32), S( 1,-29), S(-10,-26), S(-16,-17) }
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},
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{ // Rook
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{ S(-31, -9), S(-20,-13), S(-14,-10), S(-5, -9) },
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{ S(-21,-12), S(-13, -9), S( -8, -1), S( 6, -2) },
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{ S(-25, 6), S(-11, -8), S( -1, -2), S( 3, -6) },
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{ S(-13, -6), S( -5, 1), S( -4, -9), S(-6, 7) },
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{ S(-27, -5), S(-15, 8), S( -4, 7), S( 3, -6) },
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{ S(-22, 6), S( -2, 1), S( 6, -7), S(12, 10) },
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{ S( -2, 4), S( 12, 5), S( 16, 20), S(18, -5) },
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{ S(-17, 18), S(-19, 0), S( -1, 19), S( 9, 13) }
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},
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{ // Queen
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{ S( 3,-69), S(-5,-57), S(-5,-47), S( 4,-26) },
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{ S(-3,-54), S( 5,-31), S( 8,-22), S(12, -4) },
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{ S(-3,-39), S( 6,-18), S(13, -9), S( 7, 3) },
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{ S( 4,-23), S( 5, -3), S( 9, 13), S( 8, 24) },
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{ S( 0,-29), S(14, -6), S(12, 9), S( 5, 21) },
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{ S(-4,-38), S(10,-18), S( 6,-11), S( 8, 1) },
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{ S(-5,-50), S( 6,-27), S(10,-24), S( 8, -8) },
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{ S(-2,-74), S(-2,-52), S( 1,-43), S(-2,-34) }
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},
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{ // King
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{ S(271, 1), S(327, 45), S(271, 85), S(198, 76) },
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{ S(278, 53), S(303,100), S(234,133), S(179,135) },
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{ S(195, 88), S(258,130), S(169,169), S(120,175) },
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{ S(164,103), S(190,156), S(138,172), S( 98,172) },
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{ S(154, 96), S(179,166), S(105,199), S( 70,199) },
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{ S(123, 92), S(145,172), S( 81,184), S( 31,191) },
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{ S( 88, 47), S(120,121), S( 65,116), S( 33,131) },
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{ S( 59, 11), S( 89, 59), S( 45, 73), S( -1, 78) }
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}
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};
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constexpr Score PBonus[RANK_NB][FILE_NB] =
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{ // Pawn (asymmetric distribution)
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{ },
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{ S( 2, -8), S( 4, -6), S( 11, 9), S( 18, 5), S( 16, 16), S( 21, 6), S( 9, -6), S( -3,-18) },
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{ S( -9, -9), S(-15, -7), S( 11,-10), S( 15, 5), S( 31, 2), S( 23, 3), S( 6, -8), S(-20, -5) },
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{ S( -3, 7), S(-20, 1), S( 8, -8), S( 19, -2), S( 39,-14), S( 17,-13), S( 2,-11), S( -5, -6) },
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{ S( 11, 12), S( -4, 6), S(-11, 2), S( 2, -6), S( 11, -5), S( 0, -4), S(-12, 14), S( 5, 9) },
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{ S( 3, 27), S(-11, 18), S( -6, 19), S( 22, 29), S( -8, 30), S( -5, 9), S(-14, 8), S(-11, 14) },
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{ S( -7, -1), S( 6,-14), S( -2, 13), S(-11, 22), S( 4, 24), S(-14, 17), S( 10, 7), S( -9, 7) }
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};
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} // namespace
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namespace PSQT
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{
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Score psq[PIECE_NB][SQUARE_NB];
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// PSQT::init() initializes piece-square tables: the white halves of the tables are
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// copied from Bonus[] and PBonus[], adding the piece value, then the black halves of
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// the tables are initialized by flipping and changing the sign of the white scores.
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void init() {
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for (Piece pc : {W_PAWN, W_KNIGHT, W_BISHOP, W_ROOK, W_QUEEN, W_KING})
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{
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Score score = make_score(PieceValue[MG][pc], PieceValue[EG][pc]);
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for (Square s = SQ_A1; s <= SQ_H8; ++s)
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{
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File f = File(edge_distance(file_of(s)));
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psq[ pc][s] = score + (type_of(pc) == PAWN ? PBonus[rank_of(s)][file_of(s)]
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: Bonus[pc][rank_of(s)][f]);
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psq[~pc][flip_rank(s)] = -psq[pc][s];
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}
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}
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}
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} // namespace PSQT
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} // namespace Stockfish
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