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Stricter conditions in main search stand pat

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Not a biggie but is a reduced pruned patch that doesn't
seems to hurt, so it is welcomed ;-)

After 999 games at 1+0
Mod vs Orig +207 =601 -191  +6 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-01-27 12:05:27 +01:00
parent e4d3a15656
commit bd358533a4
1 changed files with 2 additions and 3 deletions
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5
src/search.cpp
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@ -1497,10 +1497,9 @@ namespace {
// Do a "stand pat". If we are above beta by a good margin then
// return immediately.
// FIXME: test with added condition 'allowNullmove || depth <= OnePly' and !value_is_mate(beta)
// FIXME: test with modified condition 'depth < RazorDepth'
if ( !isCheck
&& depth < SelectiveDepth
&& allowNullmove
&& depth < RazorDepth
&& staticValue - FutilityMargins[int(depth)] >= beta)
return staticValue - FutilityMargins[int(depth)];