This puzzle will make you either laugh at the solution, or make you argue with me about it :P If nobody gets the answer in 8 posts (by different people, NO SPAM) I'll give you a hint, but it will seem obvious after I do.

White to mate in one.

Kb7

I can give you a staleMATE in one

I believe the answer is Kc5, but it is not mate in one.

Kc7 Ka7, Kc8 Ka8, Kd7 Ka7, c7 Ka8, c8=Q+ is a possible line.

ADK

The answer is 1. c7. It's "mate in one", not "checkmate in one" .

Wow. People got it already? :*(

lets not make it "stale"mate in one and play some possible winning lines.. such as.. Kc7.

Well, I'd say heinzie really got it, I just put the move down. If you've got an open mind, a phrase like "mate in one" has a few different meanings. Don't feel too bad about it.

EDIT: Serbian, in case you didn't read the post, the OP said "mate in one", not "a winning line".

Kc7 is NOT stalemate. 

ADK

Actually, it just made me sorta groan and shake my head.

nice

AWSOME!!!

Mate in 1? Kb7 is not mate, Kxb7

c7 is stalemate, is stalemate considered a mate?

You've gotta read the earlier posts, minihag.

but how

To those who are not so fluent with English:

White and Black are mates ei friends. They are playing a friendly game. In the position on diagram white is not forcing a win with 1.Kc5 or 1.Kc7, but shows he a mate and is satisfied with a draw after 1.c7!