<prompt> Ramba uchiverenga ndima ino - Karff akatamba muWorld Womens Chess Championships katatu: 1937 Stockholm, achitamba kuPalestine ndokuisa nzvimbo yechitanhatu yakundwa naVera Menchik; 1939 Buenos Aires  <response>: , 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. 