Impossible Puzzle?

Here are the rules: Well, there really isn't that much of a difference with regular chess. You can promote to any piece on the chessboard other than a king, all the pieces move the same, etc.

The question is, what is the fastest way for White to mate Black? How many moves, from the position below? I won't say anything until someone provides the correct answer.

I suspect two moves only. b7xA8 promote to Q. Kxa8, g6 to g8.

omfg I know this puzzle and no one's going to get it...

EDIT : I stand corrected 

b8=bN#

"You can promote to any piece on the chessboard other than a king" Promote to a black piece and it's checkmate.

Black knight to be specific

Don't mess with the chess.com crowd.

Yeah, b8=(black)N# is a mate in one.

Maybe it could be possible to promote to a different color piece, but when would anyone ever want to do it? This kind of position never really happens anyways.

And, even if it were to occur, white still has a clear forced mate in 3. But, I see his point. Clever. =D

one, promote it to black knight

hehe

Axa8=Q+ Kxa8 Qg8#

a solution:b8+, kx b8, and then Qe8# or Qf8#

Brilliant!  Heinzie solves it seven months ago, and people are still screwing it up.

Gotta love the Interwebs

Haha, such a clever puzzle and answer though. Glad it was resurrected 

Zombies with chess in their blood revived it.

you promote to a black knight. it said,"You can promote to any piece on the chessboard other than a king, all the pieces move the same, etc."

you can't really promote a different colour piece in chess