[2] In August 1939, Keller (17 years old), along with Klaus Junge (15), Wolfgang Unzicker (14), Rudolf Kunath (15) and Karl Krbavac (17), played in Jugendschachwoche Fürstenwalde near Berlin.
[3] During World War II, she won the second German Women's Championship at Bad Oeynhausen 1942.
In the next German Women's Championship, she took third place, behind Gertrud Jürgens and Maja Schlemmer, at Vienna 1943, and tied for seventh-eighth at Bad Krynica 1943 (the fourth General Government chess tournament, Josef Lokvenc won).
In 1949/50, she competed in the Women's World Championship tournament in Moscow, tying for fifth-seventh place (Lyudmila Rudenko won).
[citation needed] In 1952, she tied for fourth-sixth in Moscow (Women's Candidates Tournament; Elisabeth Bykova won).