Hardest mate in 1 puzzles

Mate in 1 puzzles are really fun. They are quite easy for most players, but still are fun! What we are trying to do here is to post hard mate in 1 puzzles, could you solve all of them? Could you post a hard one?

Mate in 1

How did black get into this pos. if it's white to move? What could his last move have been? This means it is black to move. Since he just has a king, he can't deliver mate. Thus, your puzzle is unsolvable.

That's easy.

Yes- here's hy puzzle:

WTP, mate in 1

Try to find it. Here's the answer, highlight to read

1.exf6 e.p.#

But how do you know black's last move was ...f7-f5?

In a Mate in 2, both black and white play moves. So why can't they both play a move in a mate in 1?

We know that because it's the only possiblle Checkmate in one.

FutureRain wrote:

Puzzle composed by me 

never say such a hard mate in 1 puzzle

With regard to post #2.

That's a pretty cool "finesse" type of checkmate.

Dude, you have to figure that out. Otherwise how can you do the mate? 

PS. Why did you show my solution?!!

These are all exceptional (except the one from BigDoggProblem I think is disqualified).  Thank you for posting!

'Tis pretty easy to solve my one, but can you understand why 'tis a mate?

I contend that your problem has no solution. That is why I did not bother to hide it.

Say you walked into a room and two players were playing this position. They've told you it's white to move. Isn't it far more likely that Black's last move was something OTHER than ...f7-f5?

You're too easily impressed.

There is no other solution, so you must conclude that enpassant is legal!