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Simplify away improvement term in null move search

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passed STC:
https://tests.stockfishchess.org/tests/view/649c0d2edc7002ce609d33b5
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 271104 W: 72181 L: 72217 D: 126706
Ptnml(0-2): 691, 30042, 74129, 29992, 698

passed LTC:
https://tests.stockfishchess.org/tests/view/649d0dd7dc7002ce609d4efa
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 183120 W: 49469 L: 49418 D: 84233
Ptnml(0-2): 84, 17636, 56063, 17699, 78

closes https://github.com/official-stockfish/Stockfish/pull/4650

Bench: 2642851
This commit is contained in:
Muzhen Gaming 2023-06-28 18:36:11 +08:00 • committed by Joost VandeVondele
parent fa143922ae
commit eb9aaf9489
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -779,7 +779,7 @@ namespace {
&& (ss-1)->statScore < 17329
&& eval >= beta
&& eval >= ss->staticEval
&& ss->staticEval >= beta - 21 * depth - improvement / 13 + 258
&& ss->staticEval >= beta - 21 * depth + 258
&& !excludedMove
&& pos.non_pawn_material(us)
&& ss->ply >= thisThread->nmpMinPly