Beginner mate in 3 from my last game.
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Eh, don't know how to make it where you move the pieces. sry.
Yeah, you have to choose "puzzle" under "Theme". You'll see the "Theme" tab when you're creating the diagram.
Nice puzzle.
(1) Always put both kings on the board in a chess puzzle.
(2) Make sure there is only 1 solution. Here white can start with 1. Nd7+ or with 1. Rxc8+.