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Stockfish dev-20260529 - official Stockfish pre-release version!

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Official prerelease Stockfish dev-20260529
Rating Chess Engines Diary CEDR=3750.8

Great news for chess enthusiasts! 
The pre-release version of Stockfish dev-20260529, 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-20260529 version?

Simplify Internal Iterative Reductions (IIR) Condition
Passed STC non-reg:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 75840 W: 19367 L: 19192 D: 37281
Ptnml(0-2): 186, 8837, 19710, 8990, 197
https://tests.stockfishchess.org/tests/view/6a0b02ba6524d21ee79b8685

Passed LTC non-reg:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 166920 W: 42039 L: 41967 D: 82914
Ptnml(0-2): 78, 18155, 46919, 18233, 75
https://tests.stockfishchess.org/tests/view/6a0c98fb6524d21ee79b8875

Passed VTC non-reg:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 46390 W: 11914 L: 11729 D: 22747
Ptnml(0-2): 8, 4543, 13911, 4722, 11
https://tests.stockfishchess.org/tests/view/6a143877818cacc1db0ac7c5

closes #6861
Bench: 2814421



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



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