The Lucena position
K+R+P vs K+R
Your pawn stands on the seventh with your king in front of it, and one problem remains: the king cannot step out without drowning in checks. The winning method is older than its name. It is not in Lucena's 1497 book at all; the earliest surviving analysis is Salvio's, from 1634. Nimzowitsch called the manoeuvre building a bridge, and that is exactly what the rook does.
- Check the defending king first, driving it one more file from the pawn.
- Lift the rook to the fourth rank and leave it there; it will be the deck of the bridge.
- Bring the king out. Meet the checks by walking it down the board, edging toward the checking rook.
- When the next check would cost the rook, drop your own rook in front of the king: the bridge is complete and the pawn queens.