Richard Réti (May 28, 1889 – June 6, 1929) was one of the top players in the world during the 1910s and 1920s. He began his career as a fiercely combinative classical player, favoring openings such as the King's Gambit (1. e4 e5 2. f4). However, after the end of the First World War, his playing style underwent a radical change, and he became one of the principal proponents of Hypermodernism. The Réti Opening (1. Nf3) is named after him, and he defeated the world champion José Raúl Capablanca with it in 1924. Source: Richard Réti's Chess Biography on Wikipedia.