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Puzzling

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  • $\begingroup$ Just to clarify, does the checkmate have to come immediately after the under-promotion, or can it occur on any of the moves? $\endgroup$ Commented Feb 23, 2020 at 3:34
  • $\begingroup$ Black must give the mate immediately after White's underpromotion. $\endgroup$ Commented Feb 23, 2020 at 3:57
  • $\begingroup$ Oh, also did you mean 7th rank instead of 2nd? I overlooked that when I made my edits $\endgroup$ Commented Feb 23, 2020 at 7:30
  • $\begingroup$ Just to clarify: the usual self-mate problem rules still apply, right? In particular, black will resist giving the mate, and the underpromotion is supposed to be the only way to self-mate? $\endgroup$ Commented Feb 23, 2020 at 14:21
  • $\begingroup$ @Bass That is correct, the solution must be unique. $\endgroup$ Commented Feb 23, 2020 at 14:47