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Chess engine: Supernova 2.3

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Supernova is an open source UCI chess engine written in C. It can be used on Windows and Linux and requires a UCI compatible graphical user interface (Arena, Winboard, Shredder...) to function properly. 
Author: Minkai Yang  Rating JCER=2511

v.2.3
Compared to version 2.2.1, Supernova has gained about 120 Elo in self-play.

Added Syzygy tablebases support using Fathom.
Reworked late move reduction.
Let hash table move to be tried first before move gen.
Implemented counter move heuristic in move ordering.
Added transposition table in quiescence search.
Switched the main search to fail-soft.
Let the history scores of previous quiet moves be reduced when cutoff.
Changed the null move pruning formula.
Changed IID so it won't activate when in check.

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