Mate in One. Not Easy

@iwanq - no: d8=Q is impossible, the pawn is fixed by the Bc8 / if Ng6+ then Bxg6

another 'mate in 1' - lichess.org/study/Ep1q686x (see Task 1)

Searched in fairy tale chess chapters, but did not found it. Sorry.
The joke in it must be, that white queen loves black king. Romeo and Juliet.

It's very easy is Qa3

#12 this task have two solutions!

ba=Q# or ba=B#

#12 two mate in one
a8=Q#
a8=B#

yes @Neil--Dandekar / it's only 1 move, but maybe not perfect because of the 2 possible pawn promotions ;-)

dxc8=D#

dxc8=Q#