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Remove undefended minors

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Tested in "no regression" mode.

Passed both STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 68026 W: 12277 L: 12236 D: 43513

And LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 85682 W: 12861 L: 12836 D: 59985

bench: 7311935
This commit is contained in:
Arjun Temurnikar 2014-05-13 21:35:10 +02:00 • committed by Marco Costalba
parent 696d6cedb9
commit a3c8c4b70d
1 changed files with 1 additions and 9 deletions
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10
src/evaluate.cpp
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@ -169,7 +169,6 @@ namespace {
const Score RookSemiopenFile = make_score(19, 10); const Score RookSemiopenFile = make_score(19, 10);
const Score BishopPawns = make_score( 8, 12); const Score BishopPawns = make_score( 8, 12);
const Score MinorBehindPawn = make_score(16, 0); const Score MinorBehindPawn = make_score(16, 0);
const Score UndefendedMinor = make_score(25, 10);
const Score TrappedRook = make_score(90, 0); const Score TrappedRook = make_score(90, 0);
const Score Unstoppable = make_score( 0, 20); const Score Unstoppable = make_score( 0, 20);
@ -520,16 +519,9 @@ namespace {
const Color Them = (Us == WHITE ? BLACK : WHITE); const Color Them = (Us == WHITE ? BLACK : WHITE);
Bitboard b, undefendedMinors, weakEnemies; Bitboard b, weakEnemies;
Score score = SCORE_ZERO; Score score = SCORE_ZERO;
// Undefended minors get penalized even if they are not under attack
undefendedMinors = pos.pieces(Them, BISHOP, KNIGHT)
& ~ei.attackedBy[Them][ALL_PIECES];
if (undefendedMinors)
score += UndefendedMinor;
// Enemies not defended by a pawn and under our attack // Enemies not defended by a pawn and under our attack
weakEnemies = pos.pieces(Them) weakEnemies = pos.pieces(Them)
& ~ei.attackedBy[Them][PAWN] & ~ei.attackedBy[Them][PAWN]