The author presents many new insightsfor example, regarding the origins of the Ponziani Opening, the Dutch Defense and the Petroff Defense. French star La Bourdonnais used other sources for almost every part of his Nouveau Traité. Morphy’s analysis of the Philidor Defense was faulty and Anderssen’s play included many positional ideas. Harrwitz and Neumann published modern treatises long before Steinitz came out with his Modern Chess Instructor. Many ending themes belong to less well-known authors, such as Cozio, Chapais, van Zuylen van Nyevelt, Sarratt, Kling and Horwitz, Berger and Salvio.