 In 1969, he took 4th in Monte Carlo (Master Tournament).Gereben played four times in the Chess Olympiads; once for Hungary at first reserve board (+6 −3 =6) in the 11th Olympiad at Amsterdam 1954, and thrice for Switzerland; at third board (+5 −4 =7) at Siegen 1970, at second reserve (+3 −5 =5) at Skopje 1972, and at first reserve board (+3 –3 =7) at Nice 1974.He remained a keen player in his adopted country even into his seventies.