/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
Copyright (C) 2015-2019 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <algorithm>
#include "types.h"
Value PieceValue[PHASE_NB][PIECE_NB] = {
{ VALUE_ZERO, PawnValueMg, KnightValueMg, BishopValueMg, RookValueMg, QueenValueMg },
{ VALUE_ZERO, PawnValueEg, KnightValueEg, BishopValueEg, RookValueEg, QueenValueEg }
};
namespace PSQT {
#define S(mg, eg) make_score(mg, eg)
// Bonus[PieceType][Square / 2] contains Piece-Square scores. For each piece
// type on a given square a (middlegame, endgame) score pair is assigned. Table
// is defined for files A..D and white side: it is symmetric for black side and
// second half of the files.
constexpr Score Bonus[][RANK_NB][int(FILE_NB) / 2] = {
{ },
{ // Pawn
{ S( 0, 0), S( 0, 0), S( 0, 0), S( 0, 0) },
{ S(-11,-3), S( 7, -1), S( 7, 7), S(17, 2) },
{ S(-16,-2), S( -3, 2), S( 23, 6), S(23,-1) },
{ S(-14, 7), S( -7, -4), S( 20,-8), S(24, 2) },
{ S( -5,13), S( -2, 10), S( -1,-1), S(12,-8) },
{ S(-11,16), S(-12, 6), S( -2, 1), S( 4,16) },
{ S( -2, 1), S( 20,-12), S(-10, 6), S(-2,25) }
},
{ // Knight
{ S(-169,-105), S(-96,-74), S(-80,-46), S(-79,-18) },
{ S( -79, -70), S(-39,-56), S(-24,-15), S( -9, 6) },
{ S( -64, -38), S(-20,-33), S( 4, -5), S( 19, 27) },
{ S( -28, -36), S( 5, 0), S( 41, 13), S( 47, 34) },
{ S( -29, -41), S( 13,-20), S( 42, 4), S( 52, 35) },
{ S( -11, -51), S( 28,-38), S( 63,-17), S( 55, 19) },
{ S( -67, -64), S(-21,-45), S( 6,-37), S( 37, 16) },
{ S(-200, -98), S(-80,-89), S(-53,-53), S(-32,-16) }
},
{ // Bishop
{ S(-49,-58), S(- 7,-31), S(-10,-37), S(-34,-19) },
{ S(-24,-34), S( 9, -9), S( 15,-14), S( 1, 4) },
{ S( -9,-23), S( 22, 0), S( -3, -3), S( 12, 16) },
{ S( 4,-26), S( 9, -3), S( 18, -5), S( 40, 16) },
{ S( -8,-26), S( 27, -4), S( 13, -7), S( 30, 14) },
{ S(-17,-24), S( 14, -2), S( -6, 0), S( 6, 13) },
{ S(-19,-34), S(-13,-10), S( 7,-12), S(-11, 6) },
{ S(-47,-55), S( -7,-32), S(-17,-36), S(-29,-17) }
},
{ // Rook
{ S(-24, 0), S(-15, 3), S( -8, 0), S( 0, 3) },
{ S(-18,-7), S( -5,-5), S( -1,-5), S( 1,-1) },
{ S(-19, 6), S(-10,-7), S( 1, 3), S( 0, 3) },
{ S(-21, 0), S( -7, 4), S( -4,-2), S(-4, 1) },
{ S(-21,-7), S(-12, 5), S( -1,-5), S( 4,-7) },
{ S(-23, 3), S(-10, 2), S( 1,-1), S( 6, 3) },
{ S(-11,-1), S( 8, 7), S( 9,11), S(12,-1) },
{ S(-25, 6), S(-18, 4), S(-11, 6), S( 2, 2) }
},
{ // Queen
{ S( 3,-69), S(-5,-57), S(-5,-47), S( 4,-26) },
{ S( -3,-55), S( 5,-31), S( 8,-22), S(12, -4) },
{ S( -3,-39), S( 6,-18), S(13, -9), S( 7, 3) },
{ S( 4,-23), S( 5, -3), S( 9, 13), S( 8, 24) },
{ S( 0,-29), S(14, -6), S(12, 9), S( 5, 21) },
{ S( -4,-38), S(10,-18), S( 6,-12), S( 8, 1) },
{ S( -5,-50), S( 6,-27), S(10,-24), S( 8, -8) },
{ S( -2,-75), S(-2,-52), S( 1,-43), S(-2,-36) }
},
{ // King
{ S(272, 0), S(325, 41), S(273, 80), S(190, 93) },
{ S(277, 57), S(305, 98), S(241,138), S(183,131) },
{ S(198, 86), S(253,138), S(168,165), S(120,173) },
{ S(169,103), S(191,152), S(136,168), S(108,169) },
{ S(145, 98), S(176,166), S(112,197), S(69, 194) },
{ S(122, 87), S(159,164), S(85, 174), S(36, 189) },
{ S(87, 40), S(120, 99), S(64, 128), S(25, 141) },
{ S(64, 5), S(87, 60), S(49, 75), S(0, 75) }
}
};
#undef S
Score psq[PIECE_NB][SQUARE_NB];
// init() initializes piece-square tables: the white halves of the tables are
// copied from Bonus[] adding the piece value, then the black halves of the
// tables are initialized by flipping and changing the sign of the white scores.
void init() {
for (Piece pc = W_PAWN; pc <= W_KING; ++pc)
{
PieceValue[MG][~pc] = PieceValue[MG][pc];
PieceValue[EG][~pc] = PieceValue[EG][pc];
Score score = make_score(PieceValue[MG][pc], PieceValue[EG][pc]);
for (Square s = SQ_A1; s <= SQ_H8; ++s)
{
File f = std::min(file_of(s), ~file_of(s));
psq[ pc][ s] = score + Bonus[pc][rank_of(s)][f];
psq[~pc][~s] = -psq[pc][s];
}
}
}
} // namespace PSQT