Mezue ahịrịokwu na-esonụ: N'afọ 2006, ọ gbara asọmpi na
Egwuregwu Olimpik Chess maka oge mbụ. N'afọ 2013, Ziska nwetara ụkpụrụ mbụ ya achọrọ maka aha GM na Riga Technical University Open 2013. N'otu asọmpi ahụ na Riga, ọ meriri ihe omume blitz (Tournament D) na akara nke 9.5/11 isi.