New chess engine: Big-SF 140324

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Big-SF- a free and strong UCI chess engine (Stockfish derivatives

Stockfish is a free and strong UCI chess engine derived from Glaurung 2.1 that analyzes chess positions and computes the optimal moves.

Stockfish does not include a graphical user interface (GUI) that is required to display a chessboard and to make it easy to input moves. These GUIs are developed independently from Stockfish and are available online. 

Changes:
evaluate.cpp:
constexpr inline int SmallNetThreshold = 1180, PsqtOnlyThreshold = 4200;
(default: constexpr inline int SmallNetThreshold = 1136, PsqtOnlyThreshold = 2656;)




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