He just missed out at the 1976 event, finishing 2nd (with Peicho Peev, after Evgeny Ermenkov).

It was during this decade that Radulov took over from Georgi Tringov as Bulgaria's leading player, eventually giving way to Kiril Georgiev in the 1980s.

International tournament victories came at Torremolinos 1971 (shared with Miguel Quinteros), Helsinki 1972, Montilla 1974 (ahead of a strong field including Lubomir Kavalek, Helmut Pfleger, Miguel Quinteros, Florin Gheorghiu and Ulf Andersson), Bajmok 1975 (shared with Milan Matulović and Milan Vukić), Montilla 1975 (shared with Lev Polugaevsky) and Kikinda 1976.

In 2013 in Plovdiv he won the European Senior Rapid Championships.

For many years, he was a practicing civil engineer and among other projects, contributed to the design of the central train station of Sofia.