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Simplify LMR Extensions

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Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 236896 W: 61683 L: 61683 D: 113530
Ptnml(0-2): 730, 28057, 60901, 28003, 757
https://tests.stockfishchess.org/tests/view/68a9c20475da51a345a5a6a0

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 73644 W: 18936 L: 18770 D: 35938
Ptnml(0-2): 33, 7951, 20685, 8123, 30
https://tests.stockfishchess.org/tests/view/68aa95c575da51a345a5a88a

closes https://github.com/official-stockfish/Stockfish/pull/6265

Bench:  2693376
This commit is contained in:
Shawn Xu
2025-08-24 20:10:43 +02:00
committed by Joost VandeVondele
parent 39c077f15a
commit 678d503d8f
1 changed files with 1 additions and 2 deletions
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src/search.cpp
+1 -2
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@@ -1218,8 +1218,7 @@ moves_loop: // When in check, search starts here
// beyond the first move depth.
// To prevent problems when the max value is less than the min value,
// std::clamp has been replaced by a more robust implementation.
Depth d =
std::max(1, std::min(newDepth - r / 1024, newDepth + (PvNode ? 2 : 1))) + PvNode;
Depth d = std::max(1, std::min(newDepth - r / 1024, newDepth + 2)) + PvNode;
ss->reduction = newDepth - d;
value = -search<NonPV>(pos, ss + 1, -(alpha + 1), -alpha, d, true);