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Skip futility pruning if ttMove has bad history

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Passed STC:
LLR: 2.96 (-2.94,2.94) <0.00,2.00>
Total: 52416 W: 13465 L: 13128 D: 25823
Ptnml(0-2): 128, 6024, 13604, 6287, 165
https://tests.stockfishchess.org/tests/view/651fadd4ac577114367277bf

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 87348 W: 22234 L: 21818 D: 43296
Ptnml(0-2): 38, 9240, 24698, 9664, 34
https://tests.stockfishchess.org/tests/view/65201932ac57711436728218

closes https://github.com/official-stockfish/Stockfish/pull/4825

bench: 1246560
This commit is contained in:
Taras Vuk 2023-10-07 23:25:34 +02:00 • committed by Joost VandeVondele
parent f7fbc6880e
commit 7a4de96159
2 changed files with 5 additions and 1 deletions
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1
AUTHORS
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@ -210,6 +210,7 @@ Steinar Gunderson (sesse)
Stéphane Nicolet (snicolet) Stéphane Nicolet (snicolet)
Stephen Touset (stouset) Stephen Touset (stouset)
Syine Mineta (MinetaS) Syine Mineta (MinetaS)
Taras Vuk (TarasVuk)
Thanar2 Thanar2
thaspel thaspel
theo77186 theo77186

5
src/search.cpp
View file

@ -780,7 +780,10 @@ namespace {
&& depth < 9 && depth < 9
&& eval - futility_margin(depth, cutNode && !ss->ttHit, improving) - (ss-1)->statScore / 306 >= beta && eval - futility_margin(depth, cutNode && !ss->ttHit, improving) - (ss-1)->statScore / 306 >= beta
&& eval >= 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; return eval;
// Step 9. Null move search with verification search (~35 Elo) // Step 9. Null move search with verification search (~35 Elo)