Ivkov broke through into the group of the world's elite players with two brilliant results in strong tournaments in Argentina.He won at Mar del Plata 1955 with 11.5/15, ahead of Najdorf, Gligoric, Szabo, and Luděk Pachman.
Ivkov broke through into the group of the world's elite players with two brilliant results in strong tournaments in Argentina. Then he won again at Mar del Plata 1955 with 11.5/15, ahead of Najdorf, Gligoric, Szabo, and Luděk Pachman.