Chess engine: Obsidian 1.0 NNUE
Obsidian, an UCI chess engine written in c++
Search algorithm
* Iterative deepening with aspiration windows
* Very simple negamax
* Very simple move ordering
* Quiescence search
* Razoring
* Null move pruning
* Internal iterative reductions (IIR)
* Check extension
Evaluation
Obsidian evaluates position with a neural network, the architecture is 2x(768->256)->1 and is trained on 100M positions as of now.
Trivial endgames are evaluated with a special function.
To do
* Make the code cleaner
* Add move which give check to quiescence search
* Implement more pruning techniques
Credits
* The UCI structure and the Static Exchange Evaluation (SEE) are stockfish-like
* The NNUE of obsidian is trained with https://github.com/jw1912/bullet
* Iterative deepening with aspiration windows
* Very simple negamax
* Very simple move ordering
* Quiescence search
* Razoring
* Null move pruning
* Internal iterative reductions (IIR)
* Check extension
Evaluation
Obsidian evaluates position with a neural network, the architecture is 2x(768->256)->1 and is trained on 100M positions as of now.
Trivial endgames are evaluated with a special function.
To do
* Make the code cleaner
* Add move which give check to quiescence search
* Implement more pruning techniques
Credits
* The UCI structure and the Static Exchange Evaluation (SEE) are stockfish-like
* The NNUE of obsidian is trained with https://github.com/jw1912/bullet
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