Wilhelm Cohn vs Gerard Oskam
Ostend Ostend BEL round 6 1906.06.11
Bishop’s Opening: Horwitz Gambit 1-0

Gerard Oskam vs Paul F Johner
Scheveningen Scheveningen NED round 3 1923.07.25
Queen’s Gambit Declined 0-1

Edgar Colle vs Gerard Oskam
Scheveningen Scheveningen NED round 2 1923.07.24
Slav Defense: Quiet Variation, Amsterdam Variation 1-0

Jacques Mieses vs Gerard Oskam
Rotterdam Rotterdam NED 1922.09.07
Alekhine Defense 1-0

Gerard Oskam vs Carl Ahues
Berlin-Scheveningen Telegraph 1920.02.01
King’s Gambit 0-1