Ramba uchiverenga ndima ino - Karff akatamba muWorld Women's Chess Championships katatu: 1937 Stockholm, achitamba kuPalestine ndokuisa nzvimbo yechitanhatu (yakahwinwa naVera Menchik); 1939 Buenos Aires, achitamba kuU.S. ndokuisa nzvimbo yechishanu (yakahwinwawo naMenchik); 1949 Moscow
, achitamba neU.S. (akakundwa naLyudmila Rudenko). Apo FIDE yakagadza mazita muna 1950, Mona May Karff akanga ari mumwe wevakadzi vatatu vokuAmerica kugamuchira zita reInternational Woman Master.