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Give a small penalty for bishop for each pawn on the same colored square

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This commit is contained in:
Joona Kiiski 2013-04-16 21:20:31 +01:00
parent fe72c93141
commit 3e4dfb49a7
5 changed files with 16 additions and 1 deletions
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2
src/bitboard.h
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@ -63,6 +63,8 @@ extern Bitboard PassedPawnMask[COLOR_NB][SQUARE_NB];
extern Bitboard AttackSpanMask[COLOR_NB][SQUARE_NB];
extern Bitboard PseudoAttacks[PIECE_TYPE_NB][SQUARE_NB];
const Bitboard WhiteSquares = 0x55AA55AA55AA55AAULL;
const Bitboard BlackSquares = 0xAA55AA55AA55AA55ULL;
/// Overloads of bitwise operators between a Bitboard and a Square for testing
/// whether a given bit is set in a bitboard, and for setting and clearing bits.

4
src/evaluate.cpp
View file

@ -582,6 +582,10 @@ Value do_evaluate(const Position& pos, Value& margin) {
&& !more_than_one(BetweenBB[s][pos.king_square(Them)] & pos.pieces()))
score += BishopPinBonus;
// Penalty for bishop with same coloured pawns
if (Piece == BISHOP)
score -= make_score(4, 4) * ei.pi->same_colored_pawn_count(s, Us);
// Bishop and knight outposts squares
if ( (Piece == BISHOP || Piece == KNIGHT)
&& !(pos.pieces(Them, PAWN) & attack_span_mask(Us, s)))

2
src/material.cpp
View file

@ -39,7 +39,7 @@ namespace {
const Value RedundantRookPenalty = Value(554);
// pair pawn knight bishop rook queen
const int LinearCoefficients[6] = { 1617, -162, -1172, -190, 105, 26 };
const int LinearCoefficients[6] = { 1617, -162, -1172, -62, 105, 26 };
const int QuadraticCoefficientsSameColor[][PIECE_TYPE_NB] = {
// pair pawn knight bishop rook queen

6
src/pawns.cpp
View file

@ -176,6 +176,12 @@ namespace {
value += CandidateBonus[relative_rank(Us, s)];
}
e->pawnsOnWhiteSquaresCount[Us] = popcount<Max15>(ourPawns & WhiteSquares);
e->pawnsOnWhiteSquaresCount[Them] = popcount<Max15>(theirPawns & WhiteSquares);
e->pawnsOnBlackSquaresCount[Us] = popcount<Max15>(ourPawns & BlackSquares);
e->pawnsOnBlackSquaresCount[Them] = popcount<Max15>(theirPawns & BlackSquares);
return value;
}
}

3
src/pawns.h
View file

@ -40,6 +40,7 @@ struct Entry {
int file_is_half_open(Color c, File f) const { return halfOpenFiles[c] & (1 << int(f)); }
int has_open_file_to_left(Color c, File f) const { return halfOpenFiles[c] & ((1 << int(f)) - 1); }
int has_open_file_to_right(Color c, File f) const { return halfOpenFiles[c] & ~((1 << int(f+1)) - 1); }
int same_colored_pawn_count(Square s, Color c) const { return (BlackSquares & s) ? pawnsOnBlackSquaresCount[c] : pawnsOnWhiteSquaresCount[c]; }
template<Color Us>
Score king_safety(const Position& pos, Square ksq) {
@ -63,6 +64,8 @@ struct Entry {
Score value;
int halfOpenFiles[COLOR_NB];
Score kingSafety[COLOR_NB];
int pawnsOnWhiteSquaresCount[COLOR_NB];
int pawnsOnBlackSquaresCount[COLOR_NB];
};
typedef HashTable<Entry, 16384> Table;