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 ta lashe); 1939 Buenos Aires, tana taka leda a Amurka kuma ta sanya ta 5 (kuma Menchik ta lashe);
1949 Moscow, wasa don Amurka (wanda Lyudmila Rudenko ya lashe). 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.