Kasparov rose quickly with the FIDE world rankings. Because of an oversight via the USSR Chess Federation, which thought that a grandmaster Event in Banja Luka, Yugoslavia, was for juniors, he participated in that function in 1979 though still unrated. He was a alternative for your Soviet defector Viktor https://financefeeds.com/eventus-integrates-fia-techs-cross-reference-symbology/