The Lucena position is the most famous endgame position. It is as follows.
It is winning for white (with a pawn and a rook vs a rook), but only if white knows what they are doing. I give you the position and some goodies:
- A free pdf with 5 pages from my book, where I cover the Lucena position (pages 206-210)
- Here is a 13 mins video by the IM John Bartholomew covering the Lucena position
- Here is a lichess.org page that I created with the Lucena position, which you can use to practice
Enjoy!