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Simplify weak lever

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STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 14844 W: 3347 L: 3212 D: 8285
http://tests.stockfishchess.org/tests/view/5d3a2d7b0ebc5925cf0f1632

LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 55261 W: 9374 L: 9309 D: 36578
http://tests.stockfishchess.org/tests/view/5d3a3d9e0ebc5925cf0f1786

Closes https://github.com/official-stockfish/Stockfish/pull/2257

bench: 3484124
This commit is contained in:
protonspring 2019-07-25 16:27:46 -06:00 • committed by Stéphane Nicolet
parent 9d3a2ecaa2
commit d980d7c0d4
1 changed files with 5 additions and 6 deletions
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11
src/pawns.cpp
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@ -70,7 +70,7 @@ namespace {
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Direction Up = (Us == WHITE ? NORTH : SOUTH);
Bitboard b, neighbours, stoppers, doubled, support, phalanx;
Bitboard neighbours, stoppers, doubled, support, phalanx;
Bitboard lever, leverPush;
Square s;
bool opposed, backward, passed;
@ -145,11 +145,10 @@ namespace {
score -= Doubled;
}
// Penalize the unsupported and non passed pawns attacked twice by the enemy
b = ourPawns
& doubleAttackThem
& ~(e->pawnAttacks[Us] | e->passedPawns[Us]);
score -= WeakLever * popcount(b);
// Penalize our unsupported pawns attacked twice by enemy pawns
score -= WeakLever * popcount( ourPawns
& doubleAttackThem
& ~e->pawnAttacks[Us]);
return score;
}