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More reduction at cut nodes which are not a former PV node. #5199

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More reduction at cut nodes which are not a former PV node. #5199

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3 changes: 3 additions & 0 deletions src/search.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1117,6 +1117,9 @@ Value Search::Worker::search(
if (ss->ttPv)
r -= 1 + (ttValue > alpha) + (tte->depth() >= depth);

else if (cutNode && move != ttMove && move != ss->killers[0])
r++;

// Increase reduction for cut nodes (~4 Elo)
if (cutNode)
r += 2 - (tte->depth() >= depth && ss->ttPv);
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