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Chess engine: Drofa 2.4

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Drofa - UCI chess engine (written in C++11), Author: Alexander Litov.
Rating JCER=2626
Drofa started as fork of the Shallow Blue chess engine. 

v.2.2.0:
~40 elo stronger than 2.1.0 version
~140 elo stronger than 2.0.0 version.

Improvements include:
better move ordering
tempo evaluation
king proximity to passer evaluation
refactoring of the transposition table.
"Hash" UCI option added
LMR and NMP improvements
PV no longer getting cut off during long searches
several bugfixes


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