Astra is a UCI-compliant chess engine written in C++.
git clone https://github.com/h1me01/Astra.git
cd Astra/src
make -j
Astra versions 6.1.1 and below were trained with lc0-generated games.
Astra began training its neural network on self-play games, starting from randomly initialized weights. In total, 21 networks were trained, and the full process can be seen in the selfgen branch. The last network to beat master was renamed to weights-v3.nnue.
The games were converted into Stockfish's binpack format and trained with Sorei using the astra-selfplay dataset with roughly 12 billion positions.