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Remove condition for pawn threats

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It appears as though removing squares that are already attacked
by our pawns can be removed.

STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 51242 W: 11503 L: 11440 D: 28299
http://tests.stockfishchess.org/tests/view/5b58b5a40ebc5902bdb88f52

LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 35246 W: 6063 L: 5966 D: 23217
http://tests.stockfishchess.org/tests/view/5b58f8e20ebc5902bdb8959b

How to continue after this patch: there is now a slight semantic
overlap between the ThreatByPawnPush and the ThreatBySafePawn bonuses,
so hand-tuning either of these, or both at the same time, is natural.

Closes https://github.com/official-stockfish/Stockfish/pull/1702

Bench 4734881
This commit is contained in:
protonspring 2018-07-26 09:34:14 +02:00 • committed by Stéphane Nicolet
parent a4eda3056e
commit 2660a9145e
1 changed files with 1 additions and 4 deletions
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5
src/evaluate.cpp
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@ -586,10 +586,7 @@ namespace {
& (attackedBy[Us][ALL_PIECES] | ~attackedBy[Them][ALL_PIECES]);
// Bonus for safe pawn threats on the next move
b = pawn_attacks_bb<Us>(b)
& pos.pieces(Them)
& ~attackedBy[Us][PAWN];
b = pawn_attacks_bb<Us>(b) & pos.pieces(Them);
score += ThreatByPawnPush * popcount(b);
// Bonus for threats on the next moves against enemy queen