On This Day: November 20

Jose Tolosa y Carreras 1846
Otto Weisert 1884
Villy Nielsen 1906
Gabriel Authier 1922
Arkady Plostak 1924
Ivan Borisenko 1928
Lev Polugaevsky 1934
Jorgen Moller 1944
Jiangchuan Ye 1960
Andrei Kharlov 1968
Werner Sidler 1969
Marc Arnold 1992

1981: Karpov defeats Korchnoi to retain world championship title