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Chess engine: Mayhem 4.01 and NNUE (Windows and Linux)

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Mayhem - UCI chess engine, Author: Toni Helminen
Rating JCER=2550

v.4.01
New net generated ( might be weaker ... )
Cleanups / Speedups. No new stuff added
~ +-20 Elo. If the net is weaker at least it's more tactical now
NNUE: nn-cb80fb9393af.nnue
PolyGlot: performance.bin

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