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Penalize undefended minors

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Even if not under attack. This seems to be good
especially on openings.

After 12112 games at 10"+0.05
Mod vs Orig 2175 - 1997 - 7940 ELO +5 (+- 3.7)

[Patch series from Gary, little edited by me]

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Gary Linscott 2012-03-21 07:26:46 +01:00 • committed by Marco Costalba
parent 3b7dbc4f6d
commit 3c6a4bfbed
1 changed files with 8 additions and 1 deletions
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9
src/evaluate.cpp
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@ -679,12 +679,19 @@ Value do_evaluate(const Position& pos, Value& margin) {
Bitboard b;
Score score = SCORE_ZERO;
// Undefended minors get penalized even if not under attack
Bitboard undefended = pos.pieces(Them)
& (pos.pieces(BISHOP) | pos.pieces(KNIGHT))
& ~ei.attackedBy[Them][0];
if (undefended)
score += make_score(25, 10) * popcount<Max15>(undefended);
// Enemy pieces not defended by a pawn and under our attack
Bitboard weakEnemies = pos.pieces(Them)
& ~ei.attackedBy[Them][PAWN]
& ei.attackedBy[Us][0];
if (!weakEnemies)
return SCORE_ZERO;
return score;
// Add bonus according to type of attacked enemy piece and to the
// type of attacking piece, from knights to queens. Kings are not