I didn't know that you can "checkmate" with the king
Info: How to get the "Killer" Badges!

I didn't know that you can "checkmate" with the king
You can
Yes, using discovered check.

I didn't know that you can "checkmate" with the king
you have to move it out of the way to checkmate if that makes sense
♚Discovered check.
♛Mate with queen.
♝Mate or discovered check.
♞Mate or discovered check.
♟️Mate, discovered check, promotion
REMEMBER: The Killer is the piece that moves last, not the one who gives checkmate!