Bulgarian Grandmaster (1972). Civil Engineer. Champion of Bulgaria in 1971, 1974, 1977, 1980 and 1981.
Best results: Debrecen and Varna 1968, 2nd-3rd; Cacak 1969, 2nd-4th; Kecskemet 1972, 3rd; Forssa-Helsinki 1972, 1st; Montilla, Hamburg 1974, 1st; Bajmok, 1st-3rd; Virbac 1976 and 1979-80, 1st-2nd; Oslo 1977, 1st; Thessaloniki 1979, 2nd; Silkeborg 1983, 2nd; Stockholm 1986-8, 1st-4th.
Radulov has participarted in eight times Olympiads as a member of the national team. In 1968 he was awarded a bronze medal for the third-best individual performance at board 5.