Pachman went on to become one of the world's leading players. He was awarded the International Master title in 1950 and the Grandmaster title in 1954. He won fifteen international tournaments, but considered sharing second place in Havana 1963, with Mikhail Tal and Efim Geller, behind Viktor Korchnoi, his best tournament result. Pachman won the Czechoslovak championship seven times between 1946 and 1966. He became the champion of West Germany in 1978. He played in six Interzonal tournaments between Saltsjöbaden 1948 and Manila 1976. He represented Czechoslovakia in eight consecutive Chess Olympiads from 1952 through 1966, usually playing .