Borislav Ivkov was a Serbian chess Grandmaster. He was a World championship candidate in 1965, and played in four more Interzonal tournaments, in 1967, 1970, 1973, and 1979.
Ivkov in 1972
Ivkov in 1963
Ivkov in 2008
World Chess Championship 1966
A World Chess Championship was played between Tigran Petrosian and Boris Spassky in Moscow from April 9 to June 9, 1966. Petrosian won.
Tigran Petrosian
Boris Spassky
A Soviet stamp dedicated to the World Chess Championship 1966
Opening of the interzonal tournament in Amsterdam. Left-right: Mikhail Tal, R. van den Bergh (city official), Vasily Smyslov and Max Euwe