A REALLY Deep Combination

What looks like a simple endgame combination is anything but that.  

To understand this position, recall a basic concept in the endgame KB+rook pawn vs K that the game is drawn if the defending King reaches the queening square AND that square can't be attacked by the bishop.  For example, the following position is a draw because Black's king can't be driven out of the corner:

Now look at the following position and ask yourself how you would play it.  There is a win but it is much more difficult than it looks.