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Use staticEval in null prune condition

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Don't null prune at depth < 12 if staticEval < beta

STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 62858 W: 12035 L: 11632 D: 39191

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 49784 W: 7009 L: 6720 D: 36055

bench: 8054611
This commit is contained in:
ajithcj 2016-06-24 17:10:25 +00:00 • committed by Marco Costalba
parent 716a145a6c
commit ade3bb9a4e
1 changed files with 1 additions and 0 deletions
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src/search.cpp
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@ -731,6 +731,7 @@ namespace {
if ( !PvNode if ( !PvNode
&& depth >= 2 * ONE_PLY && depth >= 2 * ONE_PLY
&& eval >= beta && eval >= beta
&& (ss->staticEval >= beta || depth >= 12 * ONE_PLY)
&& pos.non_pawn_material(pos.side_to_move())) && pos.non_pawn_material(pos.side_to_move()))
{ {
ss->currentMove = MOVE_NULL; ss->currentMove = MOVE_NULL;