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Chess engine: Drofa 3.3.0 (Windows and Linux)

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Drofa - UCI chess engine (written in C++11), Author: Alexander Litov.
Rating JCER=3362
Drofa started as fork of the Shallow Blue chess engine. 

v.3.3.0:
As usual, it shows about +100 elo improvement in the self-play.
Contains improved Hand-Crafted evaluation (~+40 elo), various search improvements and a couple of bugfixes


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