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Official Stockfish pre-release: Stockfish dev-20250816

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Official prerelease Stockfish dev-20250816
Rating Chess Engines Diary CEDR=3763

Great news for chess enthusiasts! The pre-release version of Stockfish dev-20250816, 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-20250816 version?

Simplify dual bonuses
Merge dual capture/quiet bonuses into one

Passed simplification STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 223200 W: 57868 L: 57854 D: 107478
Ptnml(0-2): 689, 26441, 57296, 26515, 659
https://tests.stockfishchess.org/tests/view/6898d28e0049e8ccef9d6384

Passed simplification LTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 147270 W: 37750 L: 37659 D: 71861
Ptnml(0-2): 84, 15869, 41633, 15970, 79
https://tests.stockfishchess.org/tests/view/68990fe30049e8ccef9d643c

closes https://github.com/official-stockfish/Stockfish/pull/6226

Bench: 2996176


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





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