クマのチェスエンジン uci chess engine

• c++20
• 64-bit
• windows
• uci
• alphabeta
• threads
• hash
• ponder
• multiPV
• zobrist
• bench
• perft
• magics
• NNUE

• UCI Hash
• UCI Threads

Kuma uses an original HalfKP_256x2-32-32 NNUE net trained from self-play with reinforcement learning.

HalfKP-256-32-32-1 is the original size introduced for Shogi in 2018 by Yu Nasu, and integrated into Shogi engine YaneuraOu by Motohiro Isozaki.

https://yaneuraou.yaneu.com/2020/06/19/stockfish-nnue-the-complete-guide/

https://github.com/yaneurao/YaneuraOu

HalfKP_256x2-32-32 NNUE was implemented in Stockfish by Hisayori Noda.

https://www.chessprogramming.org/Stockfish_NNUE

https://www.chessprogramming.org/Hisayori_Noda

https://github.com/nodchip/Stockfish

HalfKP_256x2-32-32 is the ideal size ~20MB, large enough to hold sufficient data but not too large, which could negatively affect engine performance. It is simple with features that are fast to calculate.

Kuma borrows ideas and code from the following excellent open-source projects:

• Beef https://github.com/jtseng20/Beef (Jonathan Tseng)
• Defenchess https://github.com/cetincan0/Defenchess (Can Cetin & Dogac Eldenkà)
• Fire https://github.com/FireFather/fire (Norman Schmidt)
• NNUE probe: https://github.com/dshawul/nnue-probe (Daniel Shawul)
• NNUE-gui https://github.com/FireFather/nnue-gui (Norman Schmidt)