Siegbert Tarrasch was a German chess player, considered to have been among the strongest players and most influential theoreticians of the late 19th and early 20th century.
Tarrasch, c. 1900
Siegbert Tarrasch
Tarrasch and Mikhail Chigorin in Saint Petersburg, 1893
William Steinitz was a Bohemian-Austrian and, later, American chess player. From 1886 to 1894, he was the first World Chess Champion. He was also a highly influential writer and chess theoretician.
Wilhelm Steinitz
Steinitz in 1866
Steinitz's rival and bitter enemy Johannes Zukertort lost matches to him in 1872 and 1886. The second match made Steinitz the undisputed world champion.
Emanuel Lasker (right) playing Steinitz for the World Chess Championship, New York 1894