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Simplify depth condition in prior reduction

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Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 172864 W: 45085 L: 45015 D: 82764
Ptnml(0-2): 516, 20456, 44405, 20552, 503
https://tests.stockfishchess.org/tests/view/68a24791b6fb3300203bbdb6

Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 84738 W: 21733 L: 21578 D: 41427
Ptnml(0-2): 49, 9169, 23780, 9320, 51
https://tests.stockfishchess.org/tests/view/68a2665ab6fb3300203bc269

closes https://github.com/official-stockfish/Stockfish/pull/6244

Bench: 2131292
This commit is contained in:
Daniel Monroe
2025-08-24 19:43:48 +02:00
committed by Joost VandeVondele
parent 47d60a50b6
commit 57d76bd459
1 changed files with 1 additions and 1 deletions
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src/search.cpp
+1 -1
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@@ -824,7 +824,7 @@ Value Search::Worker::search(
improving = ss->staticEval > (ss - 2)->staticEval;
opponentWorsening = ss->staticEval > -(ss - 1)->staticEval;
if (priorReduction >= (depth < 10 ? 2 : 3) && !opponentWorsening)
if (priorReduction >= 3 && !opponentWorsening)
depth++;
if (priorReduction >= 2 && depth >= 2 && ss->staticEval + (ss - 1)->staticEval > 173)
depth--;