Following the Chess Olympiad in Buenos Aires 1939, he stayed in Argentina until 1948, where he won many tournaments, some of them in competition with Miguel Najdorf: Mar del Plata 1941 (ahead of Najdorf and Erich Eliskases), Buenos Aires 1941 (tied with Najdorf), Buenos Aires 1947 (ahead of Najdorf, Eliskases and Max Euwe).