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Chess engine: Mayhem 4.1 and NNUE (Windows and Linux)

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

v.4.1
Every NPS squeezed out
Speedups + simplifications + bugfixes
More solid play style
+5-10 Elo increase in strength
Net: nn-cb80fb9393af.nnue
Book: performance.bin

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