Mezue ahịrịokwu na-esonụ: N'afọ 2008, o meriri asọmpi North Urals Cup na Krasnoturinsk, Russia, na asọmpi ọsọ ọsọ ụmụ nwanyị nke
2008 World Mind Sports Games na Beijing. N'afọ 2012, Stefanova meriri n'asọmpi egwuregwu bọọlụ ụmụnwaanyị nke ụwa.