Game |
| Result | Moves |
Year | Event/Locale | Opening |
1. A Babev vs J Dueball |
| 1-0 | 35 | 1968 | WchT U26 15th qual-B | E81 King's Indian, Samisch |
2. D Metras vs J Dueball |
| 0-1 | 55 | 1968 | WchT U26 15th qual-B | A02 Bird's Opening |
3. J Dueball vs J Kolbak |
| 1-0 | 41 | 1968 | WchT U26 15th fin-A | B11 Caro-Kann, Two Knights, 3...Bg4 |
4. J Dueball vs L Mista |
| 1-0 | 39 | 1968 | WchT U26 15th fin-A | B35 Sicilian, Accelerated Fianchetto, Modern Variation with Bc4 |
5. D Zara vs J Dueball |
| 0-1 | 30 | 1968 | WchT U26 15th fin-A | A48 King's Indian |
6. I Farago vs J Dueball |
| 0-1 | 37 | 1969 | World Student Team Championship qual-2 | A41 Queen's Pawn Game (with ...d6) |
7. M Wahlbom vs J Dueball |
| 0-1 | 49 | 1969 | World Student Team Championship qual-2 | B74 Sicilian, Dragon, Classical |
8. J Dueball vs T Bjerre |
| 1-0 | 53 | 1969 | World Student Team Championship qual-2 | B99 Sicilian, Najdorf, 7...Be7 Main line |
9. M Schmidt vs J Dueball |
| 0-1 | 41 | 1969 | World Student Team Championship Final-A | A79 Benoni, Classical, 11.f3 |
10. J Dueball vs G DeFotis |
| ½-½ | 26 | 1969 | World Student Team Championship Final-A | B99 Sicilian, Najdorf, 7...Be7 Main line |
11. J Dueball vs M Basman |
| 1-0 | 68 | 1969 | World Student Team Championship Final-A | B43 Sicilian, Kan, 5.Nc3 |
12. Tseshkovsky vs J Dueball |
  | 0-1 | 30 | 1969 | World Student Team Championship Final-A | B56 Sicilian |
13. J Dueball vs E Mozes |
| ½-½ | 42 | 1969 | World Student Team Championship Final-A | B09 Pirc, Austrian Attack |
14. J Dueball vs P Votruba |
| ½-½ | 21 | 1969 | World Student Team Championship Final-A | B02 Alekhine's Defense |
15. Ljubojevic vs J Dueball |
| ½-½ | 29 | 1969 | World Student Team Championship Final-A | B36 Sicilian, Accelerated Fianchetto |
16. P Atanasov vs J Dueball |
 | 1-0 | 29 | 1969 | World Student Team Championship Final-A | D85 Grunfeld |
17. J Dueball vs A Matanovic |
| 0-1 | 46 | 1969 | Raach Zonal | B06 Robatsch |
18. H Hecht vs J Dueball |
| ½-½ | 16 | 1969 | Raach Zonal | A88 Dutch, Leningrad, Main Variation with c6 |
19. J Dueball vs G Sigurjonsson |
| 1-0 | 41 | 1969 | Raach Zonal | C16 French, Winawer |
20. O Jakobsen vs J Dueball |
| ½-½ | 31 | 1969 | Raach Zonal | A04 Reti Opening |
21. J Dueball vs Ivkov |
| ½-½ | 43 | 1969 | Raach Zonal | C86 Ruy Lopez, Worrall Attack |
22. Andersson vs J Dueball |
| ½-½ | 26 | 1969 | Raach Zonal | B25 Sicilian, Closed |
23. J Dueball vs R Hartoch |
| 1-0 | 81 | 1969 | Raach Zonal | B00 Uncommon King's Pawn Opening |
24. J Dueball vs A Dueckstein |
| ½-½ | 52 | 1969 | Raach Zonal | A10 English |
25. A Lahti vs J Dueball |
| 0-1 | 24 | 1969 | Raach Zonal | A31 English, Symmetrical, Benoni Formation |