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Simplify fail high reduction formula

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Passed STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 165792 W: 42849 L: 42768 D: 80175
Ptnml(0-2): 512, 19499, 42800, 19566, 519
https://tests.stockfishchess.org/tests/view/695cdd95912b7ff140de60c2

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 80448 W: 20619 L: 20459 D: 39370
Ptnml(0-2): 47, 8693, 22596, 8829, 59
https://tests.stockfishchess.org/tests/view/695f7e84ca95f52e4b852536

closes https://github.com/official-stockfish/Stockfish/pull/6535

bench: 2050811
This commit is contained in:
FauziAkram
2026-01-10 15:47:11 +01:00
committed by Joost VandeVondele
parent b4d4eecfb2
commit 9b8c5c9f75
1 changed files with 1 additions and 2 deletions
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src/search.cpp
+1 -2
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@@ -1206,8 +1206,7 @@ moves_loop: // When in check, search starts here
// Increase reduction if next ply has a lot of fail high // Increase reduction if next ply has a lot of fail high
if ((ss + 1)->cutoffCnt > 1) if ((ss + 1)->cutoffCnt > 1)
r += 120 + 1024 * ((ss + 1)->cutoffCnt > 2) + 100 * ((ss + 1)->cutoffCnt > 3) r += 256 + 1024 * ((ss + 1)->cutoffCnt > 2) + 1024 * allNode;
+ 1024 * allNode;
// For first picked move (ttMove) reduce reduction // For first picked move (ttMove) reduce reduction
if (move == ttData.move) if (move == ttData.move)