Hardest mate in 1 puzzles

It is really tough. Tell me the move.

The chap who posted this #1 problem now lives in a carehome in a small village in France. Amazingly he still gets out of bed once a day for a walk around the doghouse.  He remembers having played chess aeons ago but checkmates in 1 are beyond his reach. After 15 seconds of physical exercise he occasionally succeeds in moving a pawn from a2 to a3. When it completes he invariably shouts "checkmate!" as he discovered this relieves him of the chore of making another move later. When you visit him take along an instruction booklet as he appears to have forgotten most of the chess rules. If all else fails move on to his sister in the next village. He is rumoured to have passed on the secret of his chess creations to her. Happy Christmas and ditto hunting!

I did not understand.

Solved hurray

Thanks for the puzzle!

Solved!

White to move and win. 

1. white to play

2. black to play

@EvinSung: You just had a problem posted with e.p. key. Where did it go?

@EvinSung:

1) Ne5#

2) Nc2#

(Highlight to see)

1) is selfcheck and therefore illegal.

nc2 is correct

Are you sure? There were 3 light squared black bishops but that didn't make it illegal. Not even considering the last move.

i am not very sure

where is the mate?

updated version

I note that with every White piece still on the board the only possible promotion square for Black is e1.