Long time no puzzle! I tried a specific theme for this one... Have fun!
(Updated)
White to play and selfmate in 5
[Puzzle] The Illusion of Choice
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Nice idea but don't work. After 4. ... e1=Q+ 5. Qc1+ black can still play Qc3+ preparing his own funeral! "Crosscheck" is a common oversight (even by composers) so you are in good company
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Now the fix, that's the hard work!