What is the point of the black bishop on e8? Just to have a second solution and ruin everything?
If you can mate in 1, you have superhuman intelligence

The three moves that are used to try make a mate in 1 difficult, are castle, sub promotion Knight, and en passant.
But maybe I forget something.
Oh yeah, before the FIDE rules got amended, specifying you must promote into a piece of your own colour, you could get problems where the solution was to discovery check+promote into a (King blocking) piece of your opponent's colour.

g1/N# didnt copy saw for myself plus a lot of moves are checkmate its an easy puzzles if your atleast 600
Qf8