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Only do IIR in minimally reduced nodes

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Passed STC
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 164256 W: 42799 L: 42299 D: 79158
Ptnml(0-2): 451, 19305, 42087, 19863, 422
https://tests.stockfishchess.org/tests/view/68868e9b7b562f5f7b731615

Passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 279396 W: 71871 L: 71062 D: 136463
Ptnml(0-2): 126, 30117, 78404, 30924, 127
https://tests.stockfishchess.org/tests/view/6886a4977b562f5f7b731663

closes https://github.com/official-stockfish/Stockfish/pull/6196

Bench: 3490609
This commit is contained in:
aronpetkovski
2025-08-02 16:02:41 +02:00
committed by Joost VandeVondele
parent 9034730a5a
commit cef551092c
1 changed files with 3 additions and 2 deletions
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src/search.cpp
+3 -2
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@@ -813,7 +813,8 @@ Value Search::Worker::search(
{
int bonus = std::clamp(-10 * int((ss - 1)->staticEval + ss->staticEval), -1979, 1561) + 630;
mainHistory[~us][((ss - 1)->currentMove).from_to()] << bonus * 935 / 1024;
if (!ttHit && type_of(pos.piece_on(prevSq)) != PAWN && ((ss - 1)->currentMove).type_of() != PROMOTION)
if (!ttHit && type_of(pos.piece_on(prevSq)) != PAWN
&& ((ss - 1)->currentMove).type_of() != PROMOTION)
pawnHistory[pawn_structure_index(pos)][pos.piece_on(prevSq)][prevSq]
<< bonus * 1428 / 1024;
}
@@ -900,7 +901,7 @@ Value Search::Worker::search(
// Step 10. Internal iterative reductions
// At sufficient depth, reduce depth for PV/Cut nodes without a TTMove.
// (*Scaler) Especially if they make IIR less aggressive.
if (!allNode && depth >= 6 && !ttData.move)
if (!allNode && depth >= 6 && !ttData.move && priorReduction <= 3)
depth--;
// Step 11. ProbCut