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Chess engine: Astra 4.1 and NNUE

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


## 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.4.1:
History Updates
Added 6-Ply Continuation History
Added Capture History
Added Correction Histories
Improved overall move history tracking and updating
Search Improvements
Removed Check Extension
Improved static evaluation
Added history pruning
Improved null move pruning
Improved singular extension
Improved late move pruning
Improved delta pruning in quiescence search
Miscellaneous
Introduced a new, more flexible move generation
More efficient move picker


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