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Prune moves with equal SEE in qsearch

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After 5166 games:
Mod vs Orig 890 - 762 - 3514  ELO +8 (+- 5.5) LOS 96%

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-02-22 23:23:45 +01:00
parent bd33766da0
commit 91a2766308
1 changed files with 7 additions and 0 deletions
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src/search.cpp
+7
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@@ -1427,6 +1427,13 @@ split_point_start: // At split points actual search starts from here
bestValue = futilityValue; bestValue = futilityValue;
continue; continue;
} }
// Prune moves with negative or equal SEE
if ( futilityBase < beta
&& depth < DEPTH_ZERO
&& bestValue > value_mated_in(PLY_MAX)
&& pos.see(move) <= 0)
continue;
} }
// Detect non-capture evasions that are candidate to be pruned // Detect non-capture evasions that are candidate to be pruned