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Yeah I think there's a bug with the chess notation, I also had it tell me Rh3 was illegal notation. Interestingly Rf3 is not illegal notation but an illegal move for me.

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I thought I had this issue, but it turned out I had to remember the "+" at the end, when I put my opponent in check

THANK YOU! I was stuck not knowing the "+". In my case it was a check mate.

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