Kammala jumla mai zuwa: Karff ta taka leda a Gasar Cin Kofin Duniya ta Mata sau uku: 1937 Stockholm, tana taka leda a Falasdinu kuma ta sanya ta shida (wanda Vera Menchik ya lashe);
1939 Buenos Aires, wasa don Amurka da sanya 5th (kuma ya lashe Menchik); 1949 Moscow, wasa don Amurka (ya lashe Lyudmila Rudenko). Lokacin da FIDE ta kafa lakabi a 1950, Mona May Karff na ɗaya daga cikin matan Amurka uku da suka karɓi taken Mace Mace ta Duniya.