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Official Stockfish pre-release: Stockfish dev-20250809

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Official prerelease Stockfish dev-20250809
Rating Chess Engines Diary CEDR=3763

Great news for chess enthusiasts! The pre-release version of Stockfish dev-20250809, 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-20250809 version?

Adjust probcut on staticEval
Reducing probcut depth more when staticEval is very good and less if staticEval is not so good compared to beta

STC: https://tests.stockfishchess.org/tests/view/68926bf6690844f940fa1350
LLR: 2.98 (-2.94,2.94) <0.00,2.00>
Total: 174400 W: 45698 L: 45174 D: 83528
Ptnml(0-2): 622, 20356, 44672, 20976, 574

LTC: https://tests.stockfishchess.org/tests/view/689651b4f8a258623dda6531
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 56010 W: 14547 L: 14191 D: 27272
Ptnml(0-2): 31, 5929, 15738, 6267, 40

This patch was generated using qwen3-235b-a22b-thinking-2507:

Prompt: https://rentry.co/bm6vriai
Thinking: https://rentry.co/34km4zf8
Final respone: https://rentry.co/rauotrvr

closes https://github.com/official-stockfish/Stockfish/pull/6219
Bench: 3629755


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





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