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Chess engine: Astra 3.3 and NNUE

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Astra is a UCI chess engine written in C++.
Author: Semih Özalp

Evaluation
- NNUE (Efficiently Updatable Neural Network)
- Currently trained on ~38 mil. positions
- [Pytorch Neural Network](https://github.com/h1me01/Pytorch-Neural-Network)

## Credits
- [Stockfish](https://github.com/official-stockfish/Stockfish)
- [Koivisto](https://github.com/Luecx/Koivisto)
- [Smallbrain](https://github.com/Disservin/Smallbrain)
- [Chess Programming Wiki](https://www.chessprogramming.org/Main_Page)

v.3.3:
Changes:
added threads
exe is fully independent now (no need to include nnue anymore)
other small improvements


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