Lucena Position:

The Lucena position is one of the most famous and a very important position in chess endgame theory, where one side has a rook and a pawn and the defender has a rook. It is fundamental in the rook and pawn versus rook endgame. If the side with the pawn can reach this type of position, he can forcibly win the game. See the technique used below by white to convert a win out of this position.