As a member of the France open team, he won the inaugural World Team Olympiad in 1960 and the Bermuda Bowl in 1956 (runner-up in 1954, third-place 1961 and 1963), as well as European titles in 1953, 1955, 1962 (second in 1956 and 1961).
He was the author of Ghestem two-suit bids, and has significantly contributed to the theory of relay systems.
He invented and played the relay-based Monaco system with his regular partner René Bacherich.
Covering the 1963 Bermuda Bowl in Playboy, Alfred Sheinwold called them "the slowest partnership in the world" with "no rivals as a pair".
[2] The British expatriate Alan Truscott told readers of his New York Times bridge column in 1967, "all the records in this area are held by the famous French partnership".