As competition in the featherweight field grew , Lopatin switched to the lightweight division .
As competition in the featherweight field grew , Lopatin once again became the Soviet champion prior to his attendance at the 1952 Summer Olympics , after which he announced his retirement from active competition .
As competition in the featherweight field grew , Lopatin switched to the lightweight division and once again became the Soviet champion prior to his attendance at the 1952 Summer Olympics , after which he announced his retirement from active competition .