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>
{
assert(value_to_tt(nullValue, ply) == nullValue);
{
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 {
return nullValue;
}
} else {