newDepth = depth - ONE_PLY + ext;
// Step 13. Futility pruning (is omitted in PV nodes)
- if ( !PvNode
- && !captureOrPromotion
+ if ( !captureOrPromotion
&& !inCheck
&& !dangerous
&& move != ttMove
- && (bestValue > VALUE_MATED_IN_MAX_PLY || ( bestValue == -VALUE_INFINITE
- && alpha > VALUE_MATED_IN_MAX_PLY)))
+ && alpha > VALUE_MATED_IN_MAX_PLY)
{
// Move count based pruning
- if ( depth < 16 * ONE_PLY
+ if ( !PvNode
+ && depth < 16 * ONE_PLY
&& moveCount >= FutilityMoveCounts[depth]
&& (!threatMove || !refutes(pos, move, threatMove)))
{
futilityValue = ss->staticEval + ss->evalMargin + futility_margin(predictedDepth, moveCount)
+ Gain[pos.piece_moved(move)][to_sq(move)];
- if (futilityValue < beta)
+ if (!PvNode && futilityValue < beta)
{
if (SpNode)
sp->mutex.lock();