You may encounter such an ending position - you have a King and Rook against King and an A or H pawn. In some cases tha pawn can be stopped, in others, it can not. It depends on how far advanced the pawn and King are. Here is a position where...
This is a common tactic that you can use in the opening if opponent misplaces their pieces to win a pawn and get a better position.
What to do when black plays the Russian. If black decides to protect his knight with a pawn.
