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Bonus for a pawn in front of knight/bishop

Browse source 
Idea originated from a post of Don Dailey
on talkchess and reported by Eelco.

This is the last succesful attempt of a long
series of trials (as usually happens, the
'idea' alone is not enough).

Passed both short 15secs TC
LLR: 2.97 (-2.94,2.94)
Total: 7629 W: 1645 L: 1515 D: 4469

And long 60secs TC
LLR: 2.96 (-2.94,2.94)
Total: 10218 W: 1932 L: 1775 D: 6511

bench: 4944581
This commit is contained in:
Tom Vijlbrief 2013-08-13 14:19:42 +02:00 • committed by Marco Costalba
parent 4d14f97482
commit bd8f463b7e
1 changed files with 11 additions and 4 deletions
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15
src/evaluate.cpp
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@ -530,10 +530,17 @@ Value do_evaluate(const Position& pos, Value& margin) {
if (Piece == BISHOP) if (Piece == BISHOP)
score -= BishopPawns * ei.pi->pawns_on_same_color_squares(Us, s); score -= BishopPawns * ei.pi->pawns_on_same_color_squares(Us, s);
// Bishop and knight outposts squares if (Piece == BISHOP || Piece == KNIGHT)
if ( (Piece == BISHOP || Piece == KNIGHT) {
&& !(pos.pieces(Them, PAWN) & pawn_attack_span(Us, s))) // Bishop and knight outposts squares
score += evaluate_outposts<Piece, Us>(pos, ei, s); if (!(pos.pieces(Them, PAWN) & pawn_attack_span(Us, s)))
score += evaluate_outposts<Piece, Us>(pos, ei, s);
// Pawn in front of knight/bishop
if ( relative_rank(Us, s) < RANK_5
&& (pos.pieces(PAWN) & (s + pawn_push(Us))))
score += make_score(16, 0);
}
if ( (Piece == ROOK || Piece == QUEEN) if ( (Piece == ROOK || Piece == QUEEN)
&& relative_rank(Us, s) >= RANK_5) && relative_rank(Us, s) >= RANK_5)