Game |
| Result | Moves |
Year | Event/Locale | Opening |
1. A Jongsma vs B Rabinowitz |
| 1-0 | 37 | 1957 | World Junior Championship | D78 Neo-Grunfeld, 6.O-O c6 |
2. T Makelainen vs A Jongsma |
 | 0-1 | 23 | 1957 | World Junior Championship | A34 English, Symmetrical |
3. A Jongsma vs V Selimanov |
| ½-½ | 79 | 1957 | World Junior Championship | A05 Reti Opening |
4. M Gerusel vs A Jongsma |
| 1-0 | 66 | 1957 | World Junior Championship | A61 Benoni |
5. A Jongsma vs Lombardy |
 | 0-1 | 34 | 1957 | World Junior Championship | A16 English |
6. A Jongsma vs R Cardoso |
| 1-0 | 65 | 1957 | World Junior Championship | E62 King's Indian, Fianchetto |
7. P Bates vs A Jongsma |
| 0-1 | 52 | 1957 | World Junior Championship | A88 Dutch, Leningrad, Main Variation with c6 |
8. A Jongsma vs I Bahgat |
| 1-0 | 33 | 1957 | World Junior Championship | B60 Sicilian, Richter-Rauzer |
9. R Hallerod vs A Jongsma |
| 0-1 | 48 | 1957 | World Junior Championship | B45 Sicilian, Taimanov |
10. A Jongsma vs F Jobin |
| 1-0 | 40 | 1957 | World Junior Championship | B72 Sicilian, Dragon |
11. J Aldrete Lobo vs A Jongsma |
| 0-1 | 36 | 1957 | World Junior Championship | B55 Sicilian, Prins Variation, Venice Attack |
12. A Jongsma vs B Sehlstedt |
| 0-1 | 38 | 1958 | WchT U26 fin-B 05th | A02 Bird's Opening |
13. T Ghitescu vs A Jongsma |
| 1-0 | 32 | 1958 | WchT U26 fin-B 05th | B05 Alekhine's Defense, Modern |
14. P Tumurbator vs A Jongsma |
| 1-0 | 53 | 1958 | WchT U26 prel-C 05th | B03 Alekhine's Defense |
15. A Jongsma vs Emin Duraku |
| 1-0 | 38 | 1958 | WchT U26 fin-B 05th | A02 Bird's Opening |
16. R Cochrane vs A Jongsma |
| 0-1 | 40 | 1958 | WchT U26 fin-B 05th | A56 Benoni Defense |
17. A Jongsma vs P Tumurbator |
| 0-1 | 29 | 1958 | WchT U26 fin-B 05th | D17 Queen's Gambit Declined Slav |
18. A Jongsma vs J Kozma |
| 0-1 | 48 | 1958 | WchT U26 prel-C 05th | E67 King's Indian, Fianchetto |
19. I Asmundsson vs A Jongsma |
| ½-½ | 34 | 1958 | WchT U26 fin-B 05th | A67 Benoni, Taimanov Variation |
20. J H Donner vs A Jongsma |
| 0-1 | 43 | 1961 | Dutch Championship | E30 Nimzo-Indian, Leningrad |
21. A Jongsma vs J O Soderberg |
| 1-0 | 41 | 1961 | WchT U26 08th | A54 Old Indian, Ukrainian Variation, 4.Nf3 |
22. A Jongsma vs D Zorigt |
| 1-0 | 45 | 1961 | WchT U26 08th | A07 King's Indian Attack |
23. M Krajcsovits vs A Jongsma |
| 1-0 | 66 | 1961 | WchT U26 08th | D32 Queen's Gambit Declined, Tarrasch |
24. A Jongsma vs Gufeld |
 | 0-1 | 43 | 1961 | WchT U26 08th | A45 Queen's Pawn Game |
25. B Brinck-Claussen vs A Jongsma |
| ½-½ | 28 | 1961 | WchT U26 08th | B93 Sicilian, Najdorf, 6.f4 |