Oparin was awarded the title of Candidate Master in 2007, as a result of his second place, behind Kirill Alekseenko, at the European Youth Chess Championships in the Under 10 division.

[6] In July 2013 Oparin played for the silver medal-winning Russian team in the World Youth Under-16 Chess Olympiad in Chongqin, China.

[9] With this victory he achieved his third and final norm required for the title of Grandmaster (GM), the first two coming from the 2011 Chigorin Memorial and Masters Open of the 2013 Gibraltar Chess Festival.

[3] In March 2014, Oparin scored 7½/11 points in the European Individual Chess Championship, which qualified the top 23 finishers to the FIDE World Cup.

It was a match between two teams, Kings (Boris Gelfand, Alexander Morozevich, Alexei Shirov and Alexey Dreev) and Princes (Vladimir Fedoseev, Daniil Dubov, Vladislav Artemiev and Oparin), held with the Scheveningen system.