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Chess engine: Drofa 4.1.0 (Windows and Linux)

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Drofa - UCI chess engine (written in C++11), Author: Alexander Litov.
Rating JCER=3268
Drofa started as fork of the Shallow Blue chess engine. 

v.4.1.0:
New release.
Some work was made, mainly to the search and overall binary speed.
At least one more release can be expected some time in future.

Major gainers:
Tuning of the pre-move-loop pruning
SEE rewrite, in accordance to what is used in top engines
Using ALPHA cutoffs in the TT
SPSA of the incremental TM (big thanks for AGE for implementing SPSA for openbench)
Rewriting TT allocation and probing
Regression on the Pohl.pgn book

Elo   | 51.91 +- 3.55 (95%)
Conf  | 40.0+0.40s Threads=1 Hash=64MB
Games | N: 20000 W: 6892 L: 3926 D: 9182
Penta | [150, 1510, 4217, 3470, 653]
You can expect much less elo on a balanced books and/or while using non-incremental TM

As per usual, choose the binary with best speed, but building using make should give a better binary


Drofa - Rating CEDR progres
Pl Engine Rating Score Games %
928 Drofa 4.0.0 3268.6 308.50 449 68.71
1003 Drofa 3.3.27 3168.1 23.50 178 13.20


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