Building a Bridge, The Lucena
Biulding a bridge, what was Aron Nimzowitsch talking about? The Lucena position, one of the most important maneuvers to learn. It's named after Luis Ramirez de Lucena; however, the earilist book found to have this maneuver was by Alessandro Salvio dated 1634.
Many learn but few make the connection to the idea of building a bridge. Keep it simple, a bridge is used to cross over, not to cover. Also learn how to build the bridge from the side.