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Simplify away depth condition in IIR

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Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 359520 W: 92714 L: 92849 D: 173957
Ptnml(0-2): 977, 42640, 92614, 42599, 930
https://tests.stockfishchess.org/tests/view/6833705d6ec7634154f9c302

Passed simplification LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 201756 W: 51544 L: 51507 D: 98705
Ptnml(0-2): 89, 21965, 56728, 22012, 84
https://tests.stockfishchess.org/tests/view/68338e386ec7634154f9c790

Passed simplification VLTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 48558 W: 12675 L: 12492 D: 23391
Ptnml(0-2): 9, 4779, 14516, 4970, 5
https://tests.stockfishchess.org/tests/view/6838e0b26ec7634154f9d25b

closes https://github.com/official-stockfish/Stockfish/pull/6112

Bench: 2302583
This commit is contained in:
Daniel Monroe
2025-05-25 12:32:32 -07:00
committed by Joost VandeVondele
parent 70ff5e3163
commit 3747a19937
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@@ -896,7 +896,7 @@ Value Search::Worker::search(
// Step 10. Internal iterative reductions
// For PV nodes without a ttMove as well as for deep enough cutNodes, we decrease depth.
// (*Scaler) Especially if they make IIR less aggressive.
if (!allNode && depth >= (PvNode ? 5 : 7) && !ttData.move)
if (!allNode && depth >= 6 && !ttData.move)
depth--;
// Step 11. ProbCut