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Chess engine: Mayhem 5.7 and NNUE (Windows and Linux)

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Mayhem - UCI chess engine, Author: Toni Helminen
Rating JCER=3070

v.5.7
Mayhem won't trap its own bishop in FRC anymore

FRC fixes (+100 Elo in FRC)
Standard +20 Elo
Speedups
Some simplifications
bench / hash commands supported. Run "hash" to check your binary.

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