This repository contains the deep neural networks as required by the NNUE evaluation in Stockfish:
https://github.com/official-stockfish/Stockfish/
The strongest known network is integrated in the binary of Stockfish for most distributions,
and can be exported from this binary with with the UCI command export_net.
For a given Stockfish version, the default network name (UCI option EvalFile),
specifies the compatible and tested network file name. Other combinations may or may not work.
This repository is intended for developers to preserve all networks used in the master branch of Stockfish, to ensure this branch can always be built, irrespective of the state of the Stockfish infrastructure that usually provides these networks:
https://tests.stockfishchess.org/nns
This website also documents who authored the network, and when and how it was tested.
The preferred way to obtain the networks is to rely on the integration in the build process of stockfish,
i.e. either using make net or by building the code. This will automatically download the net from
https://tests.stockfishchess.org/api/nn/nn-<SHA>.nnue
where <SHA> are the first 12 digits of the sha256sum of the nn.nnue data file (sha256sum nn.nnue | cut -c1-12).
All networks in this repository were uploaded by the authors under the CC0 license.