- && is_lower_bound(tte->type())
- && tte->depth() >= depth - 3 * OnePly;
-
- // Avoid to do an expensive singular extension search on nodes where
- // such search had already failed in the past.
- if ( !PvNode
- && singularExtensionNode
- && depth < SingularExtensionDepth[PvNode] + 5 * OnePly)
- {
- TTEntry* ttx = TT.retrieve(pos.get_exclusion_key());
- if (ttx && is_lower_bound(ttx->type()))
- singularExtensionNode = false;
- }