Nyora kupfuurira kweiyi ndima - Karpov akaedza 9...Nd7 kanoverengeka mumutambo we1990 World Championship
, asi Kasparov akawana mukana wakakura pairi mumutambo wechi18. Yakasimba asi isina simba. Zvinovhiringidza 9...Nd7 inonziwo Chigorin Variation saka pane misiyano miviri yeRuy Lopez ine zita iroro, asi 9...Na5 ndiyo kufamba kunowanzobatanidzwa neChigorin. Uku kudzivirira kunozivikanwawo seKeres Variation, mushure mePaul Keres.