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Don't overwrite exsisting TT with null search value

Browse source 
Real search is considered of higher quality then null
search one.

This allows to fix the zugzwang issue with a minimal
impact on ELO.

Zugzwang verified on position:

8/7P/8/8/K2b4/p7/1k6/1B6 b - -

After 999 games at 1+0 on my QUAD
Mod vs Orig(94bb196) +168 =657 -174  -2 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-04-14 06:13:24 +01:00
parent abae3c5678
commit ec0a650dff
1 changed files with 3 additions and 1 deletions
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2
src/search.cpp
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@ -1395,7 +1395,9 @@ namespace {
{
assert(value_to_tt(nullValue, ply) == nullValue);
if (!tte)
TT.store(posKey, nullValue, VALUE_TYPE_NS_LO, depth, MOVE_NONE);
return nullValue;
}
} else {