| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. F Gobet vs J Jansson |
| 1-0 | 39 |
1981 |
EU-ch jr | B06 Robatsch |
| 2. J Jansson vs F Feistenauer |
| 1-0 | 50 |
1981 |
EU-ch jr | B90 Sicilian, Najdorf |
| 3. Y Eser Ipek vs J Jansson |
| 1-0 | 25 |
1981 |
EU-ch jr | A10 English |
| 4. D Michiels vs J Jansson |
| 1-0 | 62 |
1981 |
EU-ch jr | B06 Robatsch |
| 5. Minev vs J Jansson |
| 1-0 | 63 |
1983 |
Hamar op | B06 Robatsch |
| 6. K Yndesdal vs J Jansson |
| 1-0 | 35 |
1994 |
Oslo-op | A55 Old Indian, Main line |
| 7. J Jansson vs A Campanile |
| 1-0 | 60 |
1994 |
Oslo-op | A15 English |
| 8. T Ernst vs J Jansson |
| 1-0 | 36 |
1994 |
Oslo-op | C88 Ruy Lopez |
| 9. J Jansson vs Harald Isachsen |
| 1-0 | 23 |
2001 |
TCh-NOR Final | B23 Sicilian, Closed |
| 10. D Mastrovasilis vs J Jansson |
 | 1-0 | 28 |
2001 |
ECC | B20 Sicilian |
| 11. J Jansson vs K B Stein |
| 1-0 | 41 |
2001 |
ECC | A04 Reti Opening |
| 12. J Jansson vs O Dancevski |
| 1-0 | 55 |
2001 |
ECC | A07 King's Indian Attack |
| 13. J Jansson vs G Tallaksen |
| 1-0 | 56 |
2001 |
TCh-NOR Final | A14 English |
| 14. E O'Connor vs J Jansson |
| 1-0 | 37 |
2001 |
ECC | B08 Pirc, Classical |
| 15. I Stohl vs J Jansson |
| 1-0 | 30 |
2003 |
European Clubs Cup (Men) | A10 English |
| 16. L Breivik vs J Jansson |
| 1-0 | 25 |
2004 |
Norwegian Championship | B23 Sicilian, Closed |
| 17. F Elsness vs J Jansson |
| 1-0 | 41 |
2004 |
Norwegian Championship | E48 Nimzo-Indian, 4.e3 O-O 5.Bd3 d5 |
| 18. R Djurhuus vs J Jansson |
| 1-0 | 61 |
2004 |
Norwegian Championship | C88 Ruy Lopez |
| 19. J Jansson vs S Heim |
| 1-0 | 44 |
2004 |
Norwegian Championship | D02 Queen's Pawn Game |
| 20. J Jansson vs K Stokke |
| 1-0 | 55 |
2004 |
Norwegian Championship | D02 Queen's Pawn Game |
| 21. J Jansson vs A Lipecki |
| 1-0 | 53 |
2005 |
21st European Club Cup | D02 Queen's Pawn Game |
| 22. F Elsness vs J Jansson |
| 1-0 | 33 |
2005 |
Norwegian Championship | E38 Nimzo-Indian, Classical, 4...c5 |
| 23. O Dannevig vs J Jansson |
| 1-0 | 40 |
2005 |
Norwegian Championship | C88 Ruy Lopez |
| 24. J Jansson vs S Brunello |
| 1-0 | 30 |
2005 |
21st European Club Cup | A03 Bird's Opening |
| 25. B Byklum vs J Jansson |
| 1-0 | 24 |
2005 |
Norwegian Championship | B92 Sicilian, Najdorf, Opocensky Variation |
