 Aronin lost a match quite badly in 1944, to the strong, experienced Master Alexander Konstantinopolsky, by +1−6=5.In an All-USSR First Category tournament at Gorky, 1945, Aronin scored 5/15, for 14th place out of 16 players.However, he then achieved a very fine win in a tournament (likely a USSR Championship quarter-final) at Erevan 1945, scoring an unbeaten 12/15.