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Chess engine: Supernova 2.4

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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, Chess Engines Diary Rating=3044

v.2.4
Changes:
Added lazy SMP. Supernova can now use more than one CPU when thinking!
Fixed a Zobrist hashing bug regarding en passant.
Fixed an issue in static exchange evaluation.
Various optimizations.
Changed data type in the 8x8 board.
Encoded castling rights.
Made quit command more stable.
Compiled with GCC 11.2.

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