Porath represented the Palestine team at first board in the 6th Olympiad at Warsaw 1935, and at second board in the 8th Olympiad at Buenos Aires 1939. After World War II, Porath played for the Israeli team in nine consecutive Olympiads from 1952 through 1968. He won the Palestine Championship in 1937 and 1940 (after a play-off), and the Israeli Championship in 1953, 1957, 1959, and 1963. In 1963, he won in Ulan Bator (zonal tournament). In 1964, he took 21st in Amsterdam (interzonal).