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BrainFish: Updated July, 28 2020




This will be the last distribution as we are used to see because Thomas Zipproth is intended to integrate the NNUE function in Brainfish as soon as it will be on Stockfish (will happen?...). His Cerebellum will also be changed by games made only by NNUE engines. More details here:


BrainFish download


Brainfish is one of the strongest Stockfish-based chess engines available, extended by the general polyglot book format (.bin). There are some extensions in the Book Code for handling repetitions. In BrainFish the Book moves are only used in engine games, not in analysis mode. That means when BrainFish is playing moves which are in the Cerebellum book, it plays like StockFish regarding the evaluation, only at a much higher skill level.
Pondering is only active after the last move out of the book has been played.


Latest version: BrainFish_200724.



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10/04/19 poll average vote: 9.17.


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Binaries of the latest version:


- BrainFish_200724_32bit.exe for 32bit Windows systems
- BrainFish_200724_x64_BMI2.exe for 64bit Windows systems and Intel processors
- BrainFish_200724_x64_modern.exe for modern machines on a 64bit Windows system (uses popcnt asm-instruction)
- BrainFish_200724_x64_x64.exe for 64bit Windows systems




BrainFish source code.


BrainFish_200724_x64.exe single processor benchmark:



BrainFish_200724_32bit.exe single processor benchmark: