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cutnode and movecount lmr extension simplification

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Passed STC
https://tests.stockfishchess.org/tests/view/6294133cb0d5a7d1b780ece3
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 41072 W: 11052 L: 10908 D: 19112
Ptnml(0-2): 153, 4324, 11461, 4422, 176

Passed LTC
ltc: https://tests.stockfishchess.org/tests/view/62947ae6b0d5a7d1b780fe86
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 102736 W: 27509 L: 27459 D: 47768
Ptnml(0-2): 98, 9734, 31669, 9754, 113

closes https://github.com/official-stockfish/Stockfish/pull/4045

Bench: 6410652
This commit is contained in:
candirufish 2022-05-31 21:52:04 +02:00 • committed by Joost VandeVondele
parent 8fadbcf1b2
commit 653bd0817c
1 changed files with 1 additions and 2 deletions
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3
src/search.cpp
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@ -1194,8 +1194,7 @@ moves_loop: // When in check, search starts here
// deeper than the first move (this may lead to hidden double extensions).
int deeper = r >= -1 ? 0
: moveCount <= 4 ? 2
: PvNode ? 1
: cutNode && moveCount <= 8 ? 1
: PvNode || cutNode ? 1
: 0;
Depth d = std::clamp(newDepth - r, 1, newDepth + deeper);