Romantic chess was the style of chess which emphasized quick, tactical maneuvers characterized by aesthetic beauty rather than long-term strategic planning, which was considered to be of secondary importance. The Romantic era in chess is generally considered to have begun around the 18th century (although a primarily tactical style of chess was predominant even earlier), and to have reached its peak with Joseph MacDonnell and Pierre LaBourdonnais, the two dominant chess players in the 1830s. The 1840s were dominated by Howard Staunton, and other leading players of the era included Adolf Anderssen, Daniel Harrwitz, Henry Bird, Louis Paulsen, and Paul Morphy. The "Immortal Game", played by Anderssen and Lionel Kieseritzky on 21 June 1851 in London—where Anderssen made bold sacrifices to secure victory, giving up both rooks and a bishop, then his queen, and then checkmating his opponent with his three remaining minor pieces—is considered a supreme example of Romantic chess. The end of the Romantic era in chess is considered to be the 1873 Vienna Tournament where Wilhelm Steinitz popularized positional play and the closed game.