All Rook Endgames are Drawn (bugger!)
It's almost a loophole in the game of Chess that you're up a pawn in a Rook endgame, but can't convert. In being a pawn ahead on the Black side of an IQP Caro Kann, I learnt many lessons from this game about piece activity in Rook endings (that my opponent showed me).
It's so important for the defending Rook and King to be active, and even better if you can condemn the opponent's King (or Rook) to passivity.
Liquidation of pawns on one side of the board goes a long way to equality.
Can this Ending be won?
Key Moments of Rook Endings
My Game Annotations and Analysis