 Nyorai kupfuurira kweiyi ndima - Akapedza wechishanu pa 1986 European Championships, wechishanu pa 1987 World Indoor Championships, wechigumi pa 1990 European Indoor Championships, wechitanhatu pa 1990 European Championships uye wechishanu pa 1991 World Indoor Championships. Akava shasha yeNorway muna 1989 na1991. Gare gare muna 1991 akahwina menduru yebronze paWorld Championships muTokyo nekukanda kwemamita 20.75, asi sezvo menduru yesirivheri Georg Andersen akazobviswa mumakwikwi nekuda kwekushandisa chinhu chakarambidzwa, Nilsen akasimudzirwa kunzvimbo yemenduru yesirivheri. Makwikwi okupedzisira aNilsen aiva muEuropean Indoor Championships muna 1992, kwaakapedza ari wechinomwe. 