Jan Hein Donner vs Zoltan Kovacs
Hoogovens Beverwijk NED round 2 1955.01.09
Grünfeld Defense: Counterthrust Variation 1-0

Ingi Randver Johannsson vs Zoltan Kovacs
Amsterdam ol (Men) qual-A Amsterdam NED round 2 1954.09.05
King’s Indian Defense: Fianchetto Variation, Classical Main Line 1-0

Zoltan Kovacs vs Ugo Cala
Amsterdam ol (Men) fin-B Amsterdam NED round 1 1954.09.12
Nimzo-Indian Defense: Sämisch Variation 1-0