I have 5
Hardest mate in 1 puzzles
White to move
The queen is supposed to be on e1. I've seen this puzzle. Queen b4 is the mate in 2 because it is blacks turn now and they are zugzwanged to a mate in one
I could say that the position is already mate since white appears to be in checkmate. There. Mated.
In fact, I'm not asking you to find a move that allows white to deliver mate in 1. I'm asking you if white is in checkmate already or not.
@SomethingStranger: If that was white's last move before ...c6-c5, the bishop on b8 must be promoted. Is there any reason that is possible, or impossible?
if there is en passent then it is not checkmate

Mate in 1
if it is white to move then it is unsolvable so it most be black to move, black has one move which is Kxa2 and then white has mate in one Ra3#
Try to find it. Here's the answer, highlight to read
.#
But how do you know black's last move was ...f7-f5?
Dude, you have to figure that out. Otherwise how can you do the mate?
PS. Why did you show my solution?!!
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?
so why isn't en passant legal in the puzzle? u should add it since u forgot
Mate in 1
Black is in check, and must respond to the check, so now Black's king takes the pawn and the rook mates :)
En passant in a problem done properly, is such that the position allows you to logically conclude, as BigDogg did above, the last move was a double pawn move. Therefore, en passant is legal only because the last move *must* have been the double pawn move, and no other last move was at all possible.
For my en passant problem, the solution is here. chaotic_iak supplies the solution there; ...c6-c5+ would be impossible because white's only possible last moves before that were either bxc3 or c7xb8=B - and both require too many captures to be possible.
I apologise to BigDogg: I've more or less forgotten how to make good retros. :P
Therefore, another regular mate in 1. Again, only one move is actually a mate. (Amazing how annoying these can be, given it's only 1 move deep!)
This one was amazing!!!! I found the move by seeing where the King's only escape square was!!! Qe8#
Try this one at my page.. ⚠️ Think you can solve this MATE IN 2? It’s a beautiful finish — most players miss it. 🎥 Watch the full trap here: https://www.instagram.com/reel/DMQcpu-SOLJ/?igsh=cnV2N29hNGE4ZHFu Follow @chesspedia2021 for more daily tactics & killer endgames!
White to move
I guess the real challenge is to count all mate in 2’s