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Refine reduction logic based on next-ply cutoff count

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Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 38208 W: 10076 L: 9754 D: 18378
Ptnml(0-2): 139, 4390, 9742, 4676, 157
https://tests.stockfishchess.org/tests/view/6945bb6446f342e1ec211d93

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 64086 W: 16529 L: 16157 D: 31400
Ptnml(0-2): 34, 6808, 17990, 7174, 37
https://tests.stockfishchess.org/tests/view/69479d303c8768ca45072446

closes https://github.com/official-stockfish/Stockfish/pull/6489

Bench: 2442415
This commit is contained in:
FauziAkram
2025-12-28 14:49:19 +01:00
committed by Disservin
parent c475024be7
commit cd3a837324
1 changed files with 3 additions and 2 deletions
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src/search.cpp
+3 -2
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@@ -1203,8 +1203,9 @@ moves_loop: // When in check, search starts here
r += 1119; r += 1119;
// 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 > 2) if ((ss + 1)->cutoffCnt > 1)
r += 991 + allNode * 923; r += 120 + 1024 * ((ss + 1)->cutoffCnt > 2) + 100 * ((ss + 1)->cutoffCnt > 3)
+ 1024 * allNode;
// For first picked move (ttMove) reduce reduction // For first picked move (ttMove) reduce reduction
if (move == ttData.move) if (move == ttData.move)