King and Pawn puzzle

Here's an interesting game I played back in October. It lead to a pure king-and-pawn endgame. A key position is displayed here - it is not too hard to find the winning move for white, although I didn't find it in the game.

Click here to replay this game. Notes here are mostly by Dennis Monokroussos, although he incorporates some things that I said (referring to me as RB in his notes, and himself as DM).