 In 1946 at Tbilisi, in the USSR Championship semifinal, Aronin made an excellent tie for second place, with 11/17.This earned him a place in his first Soviet final, held in Leningrad 1947 (15th URS-ch), and he performed creditably in super-strong company with 7/19, in a tie for 17th–18th places.Aronin won the 1947 Championship of Moscow Region (Oblast) with an unbeaten score of 8½/10.