Devre is a strong open-source UCI-compatible chess engine written in C++. While writing the engine, I got great help from chessprogramming wiki, talkchess forum, Stockfish discord, and some open-source engines: Ethereal, Vice, and Koivisto.
- Fancy magic bitboards
- legal movegen with make/unmake.
- Alpha beta search (PVS)
- Quiessence search
- Transposition table
- Iterative Depening
- Aspiration Window
- Null Move Pruning
- Mate Distance Pruning
- Late Move Reduction
- Check Extension
- Futility prunings
- SEE pruning
- Singular Extension
- Correction History
- Hash move
- Good Captures sorted by Capture History
- Killer moves
- countermove
- History heuristic
- Bad Captures sorted by Capture History
Devre uses a relation-based NNUE for evaluation.
The default net is a sparse 295296 -> 128 -> 32 -> 1 network.
The training data is based on Leela data. The current training pipeline is Python-based. Training resources and other useful NNUE information can be found in the Stockfish Discord. Thanks to the Stockfish and Leela teams for publishing their training data publicly.
To compile in Linux/Windows with a CPU that supports AVX512/AVX2/SSSE3:
- to compile with makefile you can use one of the options:
makemake build=avx512make build=avx2make build=ssse3