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    $\begingroup$ This position has dozens of alternate solutions; pretty much any 5 moves by white will work. I believe OP intended the underpromotion to be the only way to selfmate. $\endgroup$ Commented Feb 23, 2020 at 10:30
  • $\begingroup$ Ah, I see. Since this is my first time doing this sort of puzzle, I based my solution on the definition of selfmate linked by the OP, which doesn't mention anything about a unique solution. Also, in my solution, Black can only mate White in exactly five moves, as opposed to earlier (which is what I thought the OP requested). $\endgroup$ Commented Feb 23, 2020 at 17:10