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History Pruning: Don't prune the main killer move.

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Also increased pruned depth to 4.

STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 23380 W: 4581 L: 4350 D: 14449

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 28934 W: 4329 L: 4105 D: 20500

Bench: 8369743

Resolves #498
This commit is contained in:
VoyagerOne 2015-11-15 20:38:01 -08:00 • committed by Joona Kiiski
parent 27ca89d479
commit 07e0741dfb
1 changed files with 2 additions and 1 deletions
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3
src/search.cpp
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@ -921,7 +921,8 @@ moves_loop: // When in check search starts from here
continue;
// History based pruning
if ( depth <= 3 * ONE_PLY
if ( depth <= 4 * ONE_PLY
&& move != ss->killers[0]
&& thisThread->history[pos.moved_piece(move)][to_sq(move)] < VALUE_ZERO
&& cmh[pos.moved_piece(move)][to_sq(move)] < VALUE_ZERO)
continue;