Hello - received my ChessUp 2 today and loving it so far!
I was playing a bot on chess.com while linked to my phone; in the position below the ChessUp board lit up and said Black won by checkmate after the move Nd1+, which of course is not checkmate since Ke2 is available. The chess.com match continued online (i.e. did not declare checkmate).
Cheers,
David