/*

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] = {

{ },

{ },

{ // 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(-44,-63), S( -4,-30), S(-11,-35), S(-28, -8) },

{ S(-18,-38), S( 7,-13), S( 14,-14), S( 3, 0) },

{ S( -8,-18), S( 24, 0), S( -3, -7), S( 15, 13) },

{ S( 1,-26), S( 8, -3), S( 26, 1), S( 37, 16) },

{ S( -7,-24), S( 30, -6), S( 23,-10), S( 28, 17) },

{ S(-17,-26), S( 4, 2), S( -1, 1), S( 8, 16) },

{ S(-21,-34), S(-19,-18), S( 10, -7), S( -6, 9) },

{ S(-48,-51), S( -3,-40), S(-12,-39), S(-25,-20) }

},

{ // Rook

{ S(-24, -2), S(-13,-6), S( -7, -3), S( 2,-2) },

{ S(-18,-10), S(-10,-7), S( -5, 1), S( 9, 0) },

{ S(-21, 10), S( -7,-4), S( 3, 2), S(-1,-2) },

{ S(-13, -5), S( -5, 2), S( -4, -8), S(-6, 8) },

{ S(-24, -8), S(-12, 5), S( -1, 4), S( 6,-9) },

{ S(-24, 3), S( -4,-2), S( 4,-10), S(10, 7) },

{ S( -8, 1), S( 6, 2), S( 10, 17), S(12,-8) },

{ S(-22, 12), S(-24,-6), S( -6, 13), S( 4, 7) }

},

{ // 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) }

}

};

constexpr Score PBonus[RANK_NB][FILE_NB] =

{ // Pawn

{ S( 0, 0), S( 0, 0), S( 0, 0), S( 0, 0), S( 0, 0), S( 0, 0), S( 0, 0), S( 0, 0) },

{ S( 0,-11), S( -3, -4), S( 13, -1), S( 19, -4), S( 16, 17), S( 13, 7), S( 4, 4), S( -4,-13) },

{ S(-16, -8), S(-12, -6), S( 20, -3), S( 21, 0), S( 25,-11), S( 29, 3), S( 0, 0), S(-27, -1) },

{ S(-11, 3), S(-17, 6), S( 11,-10), S( 21, 1), S( 32, -6), S( 19,-11), S( -5, 0), S(-14, -2) },

{ S( 4, 13), S( 6, 7), S( -8, 3), S( 3, -5), S( 8,-15), S( -2, -1), S(-19, 9), S( -5, 13) },

{ S( -5, 25), S(-19, 20), S( 7, 16), S( 8, 12), S( -7, 21), S( -2, 3), S(-10, -4), S(-16, 15) },

{ S(-10, 6), S( 9, -5), S( -7, 16), S(-12, 27), S( -7, 15), S( -8, 11), S( 16, -7), S( -8, 4) }

};

#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 + (type_of(pc) == PAWN ? PBonus[rank_of(s)][file_of(s)]

: Bonus[pc][rank_of(s)][f]);

psq[~pc][~s] = -psq[pc][s];

}

}

}

} // namespace PSQT