Draw?

I thought this position would be a draw, but when I played with it, I managed to find mate. Can anyone see something wrong with this, such as what black could have done?

It's an easy win for white! He has mating material.

Most books have a list of pawnless endings and what to expect from them.

Queen against rook/bishop/knight: Queen wins

Queen against rook and bishop/knight: Draw

Queen against two bishops/bishop and knight: Queen usually wins

Queen against two knights: Usually a draw

Rook against knight/bishop: Draw

Rook and bishop against rook: Usually a draw

Rook and knight against rook: Draw

Queen and bishop/knight against queen: Usually a draw

Two bishops against knight: Bishops usually win

Queen or rook (against king only): Win

Two bishops: Win

Bishop and knight: Usually a draw

Two knights: Draw

Bishop or knight: Draw 

Bishop and knight force checkmate against the bare King. But you have to know how to do it. It is the most complex of the "elementary" mates. The best explanation of the procedure I have seen is in Tarrasch's "The Game of Chess." But even masters have occasionally been embarrassed by having to confess they don't know how to do it and falling prey to the fifty-move rule for a draw.

The two knights draw against the bare King, but paradoxically can often force checkmate against King and pawn! This is because the pawn can be blocked and then released at the critical moment to avoid stalemate. All depends on where the pawn is.

WOW! Amazing

Black's only chances are:

-White not making time control

-White having a heart attack before routinely mating