Interesting. Is that a bug in the diagram editor? Or is that just a PGN paste and the editor doesn't check for validity?
How to play chess
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You have to manually add the hash-tag when you are putting the PGN into the file in order for it to signal checkmate when it really isn't checkmate.
No one falls for the scholar's mate anymore
What is this all!?
IS THIS A JOKE!?
The basics--the most important thing in chess is to get queen and bishop out as early as possible for a quick checkmate on f7.