This is obviously a "checkmate in 3" problem which you changed into a "checkmate in 2" by allowing the e.p. move. The "checkmate in 3" is much more interesting though!
However, the "checkmate in 3" problem is not perfect either because one of the main variations has a dual checkmate move. I made a version where this is corrected:
Good job. I'm glad that you fixed the two solutions.
I meant to write is NOT possible, but I guess my mind and fingers do things differently sometimes...
Good job. I'm glad that you fixed the two solutions.
I meant to write is NOT possible, but I guess my mind and fingers do things differently sometimes...
OK, know about that! I edit all my posts at least thrice! 
Nice
It's crazy! I would have never found that.
Cool
If black takes the pawn instead of advancing?
If black takes the pawn instead of advancing?
2. Qa1! You can find the 3rd move yourself.
I didn't mention in my original comment that it is a brilliant ambush-zugzwang problem, but it is!
I wonder though why I placed the wK on a2 in the corrected version. That restricts wQ movement and prevents the white try 1. Qa2? d3! though there are other similar tries. The king is better on e.g. b8.
This was another great puzzle correction, I think it would be a nice two mover with the Q on h1 already.Hope you don't mind me bumping one of your corrections I thought was great from around the time I joined this site...........Th K on a2 does take away more to think about,which is hard to see when you already know the key
Can you find the quickest checkmate? It is White to move and en passant on c6 is NOT possible:
EDIT:
Arikstotle's version of the puzzle is sounder as there is only one unique solution.