Tricky chess puzzle (part 3)

Hello Guys!

Here's another challange for you!

A puzzle:

Can you find a checkmate in one for white?

Yes? You did it? Really?

If not, let's see the checks first!

That's not mate...

Neither this.....

But black can capture with its pawn!!

Where is black's starting position?

On the 7th and the 8th rank.

And now black is still in the 1st and the 2nd rank. 

And the pawns cannot go back. 

That means this is a checkmate!

And yeah, this position could be legal!!

Have you enjoyed the challange?

Tell me in the comments!