&& pos.legal(move))
{
Value singularBeta = ttValue - (((ttPv && !PvNode) + 4) * depth) / 2;
- Depth halfDepth = depth / 2;
+ Depth singularDepth = (depth - 1 + 3 * (ttPv && !PvNode)) / 2;
ss->excludedMove = move;
- value = search<NonPV>(pos, ss, singularBeta - 1, singularBeta, halfDepth, cutNode);
+ value = search<NonPV>(pos, ss, singularBeta - 1, singularBeta, singularDepth, cutNode);
ss->excludedMove = MOVE_NONE;
if (value < singularBeta)