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Decrease lmr depth if static eval decreases a lot

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This tweak originally had some more conditions which have been simplified away.

Passed STC
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 60064 W: 15797 L: 15439 D: 28828
Ptnml(0-2): 236, 7080, 15106, 7310, 300
https://tests.stockfishchess.org/tests/view/67a2af9cfedef70e42ac3325

Passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 76794 W: 19740 L: 19337 D: 37717
Ptnml(0-2): 61, 8327, 21236, 8694, 79
https://tests.stockfishchess.org/tests/view/67a2c904fedef70e42ac374d

Passed Non-Regression VVLTC scaling check
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 29046 W: 7581 L: 7389 D: 14076
Ptnml(0-2): 2, 2557, 9213, 2749, 2
https://tests.stockfishchess.org/tests/view/67a54b591c4a3ea87241cb83

Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 212448 W: 55244 L: 55217 D: 101987
Ptnml(0-2): 932, 25283, 53707, 25430, 872
https://tests.stockfishchess.org/tests/view/67aaacb02554387b116f698f

Passed simplification LTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 185736 W: 47270 L: 47217 D: 91249
Ptnml(0-2): 141, 20568, 51394, 20627, 138
https://tests.stockfishchess.org/tests/view/67ab8efa133d55b1d3bc1397

closes https://github.com/official-stockfish/Stockfish/pull/5878

Bench: 2512420
This commit is contained in:
Daniel Monroe
2025-02-12 15:46:07 -08:00
committed by Disservin
parent a4edacb87a
commit d54240c50a
1 changed files with 2 additions and 0 deletions
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src/search.cpp
+2
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@@ -808,6 +808,8 @@ Value Search::Worker::search(
if (priorReduction >= 3 && !opponentWorsening) if (priorReduction >= 3 && !opponentWorsening)
depth++; depth++;
if (priorReduction >= 1 && depth >= 2 && ss->staticEval + (ss - 1)->staticEval > 200)
depth--;
// Step 7. Razoring // Step 7. Razoring
// If eval is really low, skip search entirely and return the qsearch value. // If eval is really low, skip search entirely and return the qsearch value.