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Simplify Internal Iterative Reductions (IIR) Condition

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Passed STC non-reg:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 75840 W: 19367 L: 19192 D: 37281
Ptnml(0-2): 186, 8837, 19710, 8990, 197
https://tests.stockfishchess.org/tests/view/6a0b02ba6524d21ee79b8685

Passed LTC non-reg:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 166920 W: 42039 L: 41967 D: 82914
Ptnml(0-2): 78, 18155, 46919, 18233, 75
https://tests.stockfishchess.org/tests/view/6a0c98fb6524d21ee79b8875

Passed VTC non-reg:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 46390 W: 11914 L: 11729 D: 22747
Ptnml(0-2): 8, 4543, 13911, 4722, 11
https://tests.stockfishchess.org/tests/view/6a143877818cacc1db0ac7c5

closes https://github.com/official-stockfish/Stockfish/pull/6861

Bench: 2814421
This commit is contained in:
FauziAkram
2026-05-29 19:06:38 +02:00
committed by Joost VandeVondele
parent 8cbca11a53
commit b1053e60b7
1 changed files with 1 additions and 1 deletions
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src/search.cpp
+1 -1
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@@ -989,7 +989,7 @@ Value Search::Worker::search(
// Step 10. Internal iterative reductions
// At sufficient depth, reduce depth for PV/Cut nodes without a TTMove.
// (*Scaler) Making IIR more aggressive scales poorly.
if (!ss->followPV && !allNode && depth >= 6 && !ttData.move && priorReduction <= 3)
if (!ss->followPV && !allNode && depth >= 6 && !ttData.move)
depth--;
// Step 11. ProbCut