Ramba uchiverenga ndima ino - Karff akatamba muWorld Women's Chess Championships katatu: 1937 Stockholm, achitamba kuPalestine ndokuisa nzvimbo yechitanhatu (yakundwa naVera Menchik); 1939 Buenos Aires
, achitamba neU.S. uye achiisa 5th (yakundwawo naMenchik); 1949 Moscow, achitamba neU.S. (yakundwa naLyudmila Rudenko). Apo FIDE yakagadza mazita muna 1950, Mona May Karff akanga ari mumwe wevakadzi vatatu vokuAmerica kugamuchira zita reInternational Woman Master.