Tim Krabbe vs Alexander Jongsma
Hoogovens-B Wijk aan Zee NED round 14 1969.01.30
Barnes Defense 1-0

Maximilian Ujtelky vs Alexander Jongsma
Hoogovens-B Wijk aan Zee NED round 6 1969.01.20
English Opening: Drill Variation 1-0

Gosta Kvist vs Alexander Jongsma
WchT U26 08th Helsinki FIN round 11 1961.07.28
English Opening: Anglo-Indian Defense, Grünfeld Formation 1/2-1/2