well, Nc3 isn't checkmate. Black has Kd4. And here are the rules I'm working by:
At the end of the move, black must be in checkmate.
All pieces must move normally, as they would in normal chess.
You must also abide by the touch move rule and so forth.
No capturing the king.
Originally posted by doodinthemood that's mate in 2 🙂
Yes, there is no knight move (except for moves where white takes his own material as Gastel suggested) that gives an instant checkmate. Therefore the only thing white can do to get mate in 1 is get mate in 1 after his move. The alternative is Kxf3, but the preamble suggests that a knight move is necessary.