Adolf Anderssen (1818–1879) was a German chess master widely regarded as the strongest player in the world during the mid-19th century. Born in Breslau, Prussia (now Wrocław, Poland), he gained international fame by winning the first major international chess tournament in London in 1851. Anderssen was celebrated for his brilliant attacking style and imaginative sacrifices, exemplified in his famous “Immortal Game” (1851) and “Evergreen Game” (1852). Though he later lost official matches to Paul Morphy and Wilhelm Steinitz, Anderssen remained a dominant tournament competitor and a key figure in the Romantic era of chess.
Lionel Kieseritzky (1806–1853) was a Baltic German chess master and influential teacher, born in Dorpat in the Russian Empire (now Tartu, Estonia). He spent much of his career in Paris, where he became a leading figure at the Café de la Régence, a center of European chess life. Kieseritzky was known for his analytical approach and contributions to opening theory, including lines in the King’s Gambit. Though a strong player, he is best remembered for losing to Adolf Anderssen in the celebrated “Immortal Game” of 1851, a classic example of Romantic-era attacking chess.