This actually came up in one of my games, with a slight alteration, because as it was, the black king had a chance to escape, but didn't see it.
This is my first puzzle, and I'm not the most experienced player, so if you find any inacuracies with it, let me know!
Sorry but after
It looks like a lot of the positions being given are flawed. One that nobody picked up on yet is xalways. Ie. 1. Rd3 exd3 2. Qc8 de 3. Qb7 #. Incidentally, I thought the idea of this post was to encourage daily puzzle submissions, not put them in here unchecked. There is another forum for our own problems. But dont be put off, this is a good way to learn.
But this is not the solution black can also play 1...e3 The solution is much more funny!