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Skip futility pruning if ttMove has bad history #4825

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Skip futility pruning if ttMove has bad history #4825

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1fc092f
Update search.cpp
TarasVuk Oct 7, 2023
4ebcde6
Update AUTHORS
TarasVuk Oct 7, 2023
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1 change: 1 addition & 0 deletions AUTHORS
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Original file line number Diff line number Diff line change
Expand Up @@ -210,6 +210,7 @@ Steinar Gunderson (sesse)
Stéphane Nicolet (snicolet)
Stephen Touset (stouset)
Syine Mineta (MinetaS)
Taras Vuk
Thanar2
thaspel
theo77186
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5 changes: 4 additions & 1 deletion src/search.cpp
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Expand Up @@ -779,7 +779,10 @@ namespace {
&& depth < 9
&& eval - futility_margin(depth, cutNode && !ss->ttHit, improving) - (ss-1)->statScore / 306 >= beta
&& eval >= beta
&& eval < 24923) // smaller than TB wins
&& eval < 24923 // smaller than TB wins
&& !( !ttCapture
&& ttMove
&& thisThread->mainHistory[us][from_to(ttMove)] < 989))
return eval;

// Step 9. Null move search with verification search (~35 Elo)
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