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Relax TT condition for zugzwang verified null values

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In this case use a normal VALUE_TYPE_LOWER TT type instead of
VALUE_TYPE_NS_LO. This allow us to TT cut-off in a bit more nodes.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-04-10 10:48:08 +01:00
parent 626b1f8c6a
commit 909e3adede
1 changed files with 3 additions and 1 deletions
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4
src/search.cpp
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@ -1388,7 +1388,9 @@ namespace {
{
assert(value_to_tt(nullValue, ply) == nullValue);
TT.store(posKey, nullValue, VALUE_TYPE_NS_LO, depth, MOVE_NONE);
// Special flag null values that are not zugzwang checked
ValueType vt = (depth < 6 * OnePly ? VALUE_TYPE_NS_LO : VALUE_TYPE_LOWER);
TT.store(posKey, nullValue, vt, depth, MOVE_NONE);
return nullValue;
}
} else {