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Prune dangerous moves at low depth

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At very low depths prune captures,
promotions and checks if see is negative.

STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 6772 W: 1328 L: 1173 D: 4271

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 8917 W: 1270 L: 1122 D: 6525

bench: 6024713
This commit is contained in:
ajithcj 2016-09-08 05:51:41 +02:00 • committed by Marco Costalba
parent e340ce221c
commit 38428ada54
1 changed files with 10 additions and 0 deletions
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10
src/search.cpp
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@ -956,6 +956,16 @@ moves_loop: // When in check search starts from here
continue; continue;
} }
} }
else if ( depth < 3 * ONE_PLY
&& !inCheck
&& bestValue > VALUE_MATED_IN_MAX_PLY
&& !rootNode
&& ( captureOrPromotion
|| givesCheck
|| pos.advanced_pawn_push(move))
&& pos.see_sign(move) < VALUE_ZERO
)
continue;
// Speculative prefetch as early as possible // Speculative prefetch as early as possible
prefetch(TT.first_entry(pos.key_after(move))); prefetch(TT.first_entry(pos.key_after(move)));