Nyorai kuenderera mberi kweiyi ndima - Munguva iyi, Stean aigara achifanira kuisa parutivi zvido zvake zvekutamba, sezvo aive achibatanidzwa sechimwe chechikwata chaViktor Korchnoi chevashandisi vemakwikwi epasirose mumakwikwi epasirose muna 1977-78 na1980-81
. Muzvinhu zvakawanda, kudyidzana kwakabudirira; Korchnoi akafuratira vamwe vakwikwidzi vane simba vakadai saBoris Spassky, Robert Hübner naLev Polugaevsky munzira yekuenda kumagumo ake maviri naKarpov. Basa raStean raibatanidzwa zvikurukuru nokugadzirira kuvhura uye iye naKorchnoi vakava shamwari dzakanaka.