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Less futility pruning. #3804

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Less futility pruning. #3804

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2 changes: 1 addition & 1 deletion src/search.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -817,7 +817,7 @@ namespace {

// Step 7. Futility pruning: child node (~50 Elo).
// The depth condition is important for mate finding.
if ( !PvNode
if ( !ss->ttPv
&& depth < 9
&& eval - futility_margin(depth, improving) >= beta
&& eval < 15000) // 50% larger than VALUE_KNOWN_WIN, but smaller than TB wins.
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