<prompt> Pedzisa mutsara unotevera: Karff akatamba mumakwikwi matatu eWorld Womens Chess Championships: 1937 Stockholm, achitamba kuPalestine ndokuisa nzvimbo yechitanhatu yakundwa naVera Menchik;  <response>: 1939 Buenos Aires, ichitambira U.S. uye ichiisa 5th yakundwawo naMenchik; 1949 Moscow, ichitambira U.S. yakundwa naLyudmila Rudenko. Apo FIDE yakagadza mazita muna 1950, Mona May Karff akanga ari mumwe wevakadzi vatatu vokuAmerica kugamuchira zita reInternational Woman Master. 