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Official Stockfish pre-release: Stockfish dev-20250728

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Official prerelease Stockfish dev-20250728
Rating Chess Engines Diary CEDR=3763

Great news for chess enthusiasts! The pre-release version of Stockfish dev-20250728, widely recognized as the world's top chess engine, has been released. This brings us one step closer to the next official release. Our team is excited to begin testing it today, and we'll be sure to share the results on our website. Stay tuned!

What changes in the new Stockfish dev-20250728 version?

Simplify LMR extension limit formula
This patch simplifies the maximum depth formula that reductions in LMR can allow.

Passed STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 35616 W: 9358 L: 9139 D: 17119
Ptnml(0-2): 101, 4051, 9278, 4284, 94
https://tests.stockfishchess.org/tests/view/688608cf966ed85face24882

Passed LTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 22284 W: 5833 L: 5613 D: 10838
Ptnml(0-2): 8, 2367, 6173, 2585, 9
https://tests.stockfishchess.org/tests/view/68860d7f966ed85face248d5
closes https://github.com/official-stockfish/Stockfish/pull/6191

Bench: 2902492



Here are some sample tournament wins for the Stockfish engine on Android and Windows::





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