Italian first Grandmaster (1974). President of the Italian Chess Federation (1994-96). Banker. Italian Youth Champion in 1966 and Italian Champion in 1969 and 1971.
Best results: winner at La Spezia 1967, Reggio Emilia 19969-1970, Bari 1970, FIDE Zonal Caorle 1975, Rovigo 1976, Stockholm 1976-77, Bagni de Luca 1978, Lugano 1979, San Giorgio 1986. Also second in Venise 1971 and Rome 1979.
Mariotti has played in four Olympiads in 1972, 1974, 1986 and 1988.
Italian first Grandmaster (1974). President of the Italian Chess Federation (1994-96). Banker. Italian Youth Champion in 1966 and Italian Champion in 1969 and 1971.