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Reintroduce reduction term in LMR for cutnodes

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This term increases reduction for cutnodes without tt move, term was simplified away recently.

Passed STC:
https://tests.stockfishchess.org/tests/view/688882007b562f5f7b73262f
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 187616 W: 49367 L: 48824 D: 89425
Ptnml(0-2): 710, 21898, 48034, 22471, 695

Passed LTC:
https://tests.stockfishchess.org/tests/view/688c71f4502b34dd5e71139a
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 140280 W: 36280 L: 35750 D: 68250
Ptnml(0-2): 79, 15175, 39121, 15667, 98

closes https://github.com/official-stockfish/Stockfish/pull/6206

Bench: 2996732
This commit is contained in:
Michael Chaly
2025-08-04 14:58:59 +02:00
committed by Joost VandeVondele
parent 8e733d68fd
commit 5d1505d8c7
1 changed files with 1 additions and 1 deletions
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src/search.cpp
+1 -1
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@@ -1183,7 +1183,7 @@ moves_loop: // When in check, search starts here
// Increase reduction for cut nodes
if (cutNode)
r += 3000;
r += 3000 + 1024 * !ttData.move;
// Increase reduction if ttMove is a capture
if (ttCapture)