Installation and download
Breaking News 25.07.2020

Breaking News 25.07.2020

Brainfish and Cerebellum updates suspended till the NNUE branch is merged into the stockfish master
Last updated versions released on July 25, 2020

Because StockfishNNUE (SF with neuronal net evaluation) is now (July 25) about 60 Elo stronger than stockfish dev., it makes no sense to continue with Brainfish or Cerebellum till the new stockfish with integrated nnue will become available. Then also a new Cerebellum will be started with the strongest available nnue net.


Brainfish needs a Cerebellum_Light_Poly.bin book to play as Brainfish.

Without this book, it plays identical to Stockfish.
The book can be registered in your UCI Engine setup for Brainfish in the parameter BookFile.
This parameter must contain the full path and name of Cerebellum_Light_Poly.bin.

For example if you unzip the Cerebellum_light_160731 folder on your drive d:, BookFile must contain:

Cerebellum Leela Date Positions Info

Cerebellum lc0

July 25, 2020


Release 1

Cerebellum Leela Net T40.T8.610

March 24, 2020


Release 6

Cerebellum Stockfish Date Positions Info

Cerebellum Stockfish

July 25, 2020


Release 178

Cerebellum Stockfish

March 24, 2020


Release 177

Cerebellum Leela books:

Cerebellum_Light_lc0 is calculated with lc0 and an experimental Net.
Despite the smaller size it should be stronger than the old Net T40.T8.610
Cerebellum_Light_NetT610 has been calculated with lc0 und Net T40.T8.610

BrainFish/Cerebellum successes in the Infinity Chess Engine Masters Tournaments


Chess engine Date Bench Info


July 24, 2020


bmi2, modern, x64, x32


July 24, 2020


Windows, Unix