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Use null move when depth >= 2 plies
author
Joona Kiiski
<joona.kiiski@gmail.com>
Tue, 20 Aug 2013 22:26:16 +0000
(23:26 +0100)
committer
Marco Costalba
<mcostalba@gmail.com>
Thu, 22 Aug 2013 07:06:48 +0000
(09:06 +0200)
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
src/search.cpp
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diff --git
a/src/search.cpp
b/src/search.cpp
index 2a7cde2b5fe848b7be3c778c263fc5d730da9a5b..9ae28d3c55870b554a5681782442dbbc3569b3c3 100644
(file)
--- a/
src/search.cpp
+++ b/
src/search.cpp
@@
-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()))