Josef Kupper vs Mikhail Tal
Zurich Zurich SUI round 2 1959.05.20
Sicilian Defense: Najdorf Variation 0-1

Edgar Walther vs Josef Kupper
Zuerich Zuerich SUI round 9 1954.04.28
Nimzo-Indian Defense: Normal Variation, Bronstein (Byrne) Variation 0-1

Milan Matulovic vs Josef Kupper
Zuerich Zuerich SUI round 7 1961.06.??
Sicilian Defense: Taimanov Variation, Bastrikov Variation 1-0

Petar Trifunovic vs Josef Kupper
Zuerich Zuerich SUI round 3 1954.04.21
Döry Defense 0-1

Robert James Fischer vs Josef Kupper
Zurich Zurich SUI round 4 1959.05.23
Sicilian Defense: Sozin Attack, Fischer Variation 1-0

Josef Kupper vs Terry Kelly
Amsterdam ol (Men) fin-B Amsterdam NED round 4 1954.09.15
Sicilian Defense: Richter-Rauzer Variation, Classical Variation 1/2-1/2