 Stuck behind the incredibly deep Soviet vanguard, which in 1957 had 15 of the world's top 20 players, Aronin's chances to go abroad never came, since he was 37 by this time, and international opportunities were reserved for proven winners and younger players.Aronin's style tended to be positional in nature, with the tactics arising naturally out of the position rather than being forced, and he was one of the leading lights with the King's Indian Defence from the mid-1940s, as this defence became very popular.He was a fine theoretician who was dangerous for virtually everyone he met; during his career he scored wins over almost all the top Soviet players, excepting Mikhail Botvinnik and Vasily Smyslov.