It was an offline game from years ago and it didn't actually happen because I wimped out and kept the rook, and the game was eventually drawn. I don't remember all the details of the position, but I can dig up the score sheet.
But I would have had a passed pawn. I just wasn't sure I was going to be left with the power to force the pawn home. It was a closed game, which probably would have opened up with a series of exchanges.
My weenieness in that game has haunted me ever since, because it was pretty much a certain draw otherwise.