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Use null move when depth >= 2 plies

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Passed both short TC:
LLR: 2.96 (-2.94,2.94)
Total: 23725 W: 5031 L: 4855 D: 13839

And long TC:
LLR: 2.96 (-2.94,2.94)
Total: 15730 W: 2939 L: 2754 D: 10037

bench: 4729333
This commit is contained in:
Joona Kiiski 2013-08-20 23:26:16 +01:00 • committed by Marco Costalba
parent c6baefb79d
commit f39cf1b008
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -663,7 +663,7 @@ namespace {
// Step 8. Null move search with verification search (is omitted in PV nodes)
if ( !PvNode
&& !ss->skipNullMove
&& depth > ONE_PLY
&& depth >= 2 * ONE_PLY
&& eval >= beta
&& abs(beta) < VALUE_MATE_IN_MAX_PLY
&& pos.non_pawn_material(pos.side_to_move()))