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Removing history condition

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Removing the bad history condition from the skip futility pruning formula.

Passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 142688 W: 36420 L: 36317 D: 69951
Ptnml(0-2): 481, 16653, 36970, 16762, 478
https://tests.stockfishchess.org/tests/view/65270a663125598fc7eb8c67

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 435378 W: 110723 L: 110925 D: 213730
Ptnml(0-2): 278, 47251, 122788, 47139, 233
https://tests.stockfishchess.org/tests/view/6528595f3125598fc7eba8f5

closes https://github.com/official-stockfish/Stockfish/pull/4834

Bench: 1110579
This commit is contained in:
FauziAkram 2023-10-19 14:38:07 +03:00 • committed by Joost VandeVondele
parent d3d0c69dc1
commit 90c18b0b50
1 changed files with 1 additions and 2 deletions
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3
src/search.cpp
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@ -786,8 +786,7 @@ namespace {
&& eval >= beta
&& eval < 29462 // smaller than TB wins
&& !( !ttCapture
&& ttMove
&& thisThread->mainHistory[us][from_to(ttMove)] < 989))
&& ttMove))
return eval;
// Step 9. Null move search with verification search (~35 Elo)