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Don't futility-prune ttMove

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After 933 games
Mod vs Orig +219 =505 -208 +4 ELO

A small increase as expected.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-11-10 18:15:22 +01:00
parent dd5a3ae4a6
commit 3c085775d7
1 changed files with 3 additions and 1 deletions
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4
src/search.cpp
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@@ -1398,7 +1398,8 @@ namespace {
// Futility pruning // Futility pruning
if ( useFutilityPruning if ( useFutilityPruning
&& !dangerous && !dangerous
&& !captureOrPromotion) && !captureOrPromotion
&& move != ttMove)
{ {
// History pruning. See ok_to_prune() definition // History pruning. See ok_to_prune() definition
if ( moveCount >= 2 + int(depth) if ( moveCount >= 2 + int(depth)
@@ -1609,6 +1610,7 @@ namespace {
&& !isCheck && !isCheck
&& !pvNode && !pvNode
&& !moveIsCheck && !moveIsCheck
&& move != ttMove
&& !move_is_promotion(move) && !move_is_promotion(move)
&& !pos.move_is_passed_pawn_push(move)) && !pos.move_is_passed_pawn_push(move))
{ {