Self-Mate is a very interesting concept wherein you force the opponent to mate your own King ! The perfect self-mate will have only one permissible move for the suicide.
A lot of brilliant problems have been composed based on this theme.
Check out a simple self-mate puzzle in the position shown in the Diagram: Black to move and self-mates in 2 moves.
2. g6 Qf5!
3. g7 #
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