Dee ihe ọzọ maka paragraf a - N'afọ 2006 ọ gbara asọmpi Chess Olympiad
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.