Many hours (spread over several days as I need breaks in case I get stuck and/or tired): I need to find an idea first but then also have to rearrange pieces again and again because either there is an unforeseen defence or other moves besides the intended one win, too. I have to experiement until only one single, clear and aesthetic solution remains.
Well, after 1. Qe6 Nd6 2. Qxg6 Nxg7 3. Qxd7 is impossible, but I guess you mean the correct move.
So what after 1. Qe6 Nf6?
Yes, now I'm getting confused. But yeah Rxf6! as Rook can't take f6 because of Qxd7#
Yes, I think you found the most important variations, congrats!
Soon I will add an example solution to this post.
How long did it take you to create this as there are so many variations I didn’t even see after Qe6
Many hours (spread over several days as I need breaks in case I get stuck and/or tired): I need to find an idea first but then also have to rearrange pieces again and again because either there is an unforeseen defence or other moves besides the intended one win, too. I have to experiement until only one single, clear and aesthetic solution remains.