Last night I reached this position after White played 54. Kd4. I eventually arrived at this position after my opponent missed a totally killer move and a few moves later hung a bishop. So instead of being down a piece and a pawn, I was up a piece.
There are similarities between this position and the one from last Friday. I have a passed pawn that the opponent's king is within striking distance of, and the opponent has a pawn majority on the king side. My king can't go wandering too far away unless I get the bishop on the a3-f8 diagonal at the right time. Remembering last week's position I came up with the plan to either promote the a pawn or get the bishop on the crucial diagonal to free up my king. There are a number of different ways to win this position. I could have simply put the bishop back on b4 but I didnt want it where white could harass it and still be within the box. I decided I wanted to utilize what I had learned from last week's game.