| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. J Jansson vs A Frois |
| 0-1 | 48 |
1981 |
EU-ch jr | B23 Sicilian, Closed |
| 2. J Jansson vs G Siegel |
| 0-1 | 50 |
1981 |
EU-ch jr | B21 Sicilian, 2.f4 and 2.d4 |
| 3. Y Eser Ipek vs J Jansson |
| 1-0 | 25 |
1981 |
EU-ch jr | A10 English |
| 4. J Jansson vs T Karolyi Jr. |
| 0-1 | 50 |
1981 |
EU-ch jr | D01 Richter-Veresov Attack |
| 5. D Michiels vs J Jansson |
| 1-0 | 62 |
1981 |
EU-ch jr | B06 Robatsch |
| 6. F Gobet vs J Jansson |
| 1-0 | 39 |
1981 |
EU-ch jr | B06 Robatsch |
| 7. Minev vs J Jansson |
| 1-0 | 63 |
1983 |
Hamar op | B06 Robatsch |
| 8. J Jansson vs Jansa |
| 0-1 | 51 |
1987 |
Gausdal | A10 English |
| 9. K Yndesdal vs J Jansson |
| 1-0 | 35 |
1994 |
Oslo-op | A55 Old Indian, Main line |
| 10. T Ernst vs J Jansson |
| 1-0 | 36 |
1994 |
Oslo-op | C88 Ruy Lopez |
| 11. D Mastrovasilis vs J Jansson |
 | 1-0 | 28 |
2001 |
ECC | B20 Sicilian |
| 12. J Jansson vs A Maljush |
| 0-1 | 32 |
2001 |
ECC | D78 Neo-Grunfeld, 6.O-O c6 |
| 13. J Jansson vs H Harestad |
| 0-1 | 37 |
2001 |
TCh-NOR Final | A15 English |
| 14. E O'Connor vs J Jansson |
| 1-0 | 37 |
2001 |
ECC | B08 Pirc, Classical |
| 15. J Jansson vs G Meins |
| 0-1 | 28 |
2003 |
European Clubs Cup (Men) | A06 Reti Opening |
| 16. I Stohl vs J Jansson |
| 1-0 | 30 |
2003 |
European Clubs Cup (Men) | A10 English |
| 17. L Breivik vs J Jansson |
| 1-0 | 25 |
2004 |
Norwegian Championship | B23 Sicilian, Closed |
| 18. J Jansson vs O Dannevig |
| 0-1 | 81 |
2004 |
Norwegian Championship | A46 Queen's Pawn Game |
| 19. F Elsness vs J Jansson |
| 1-0 | 41 |
2004 |
Norwegian Championship | E48 Nimzo-Indian, 4.e3 O-O 5.Bd3 d5 |
| 20. R Djurhuus vs J Jansson |
| 1-0 | 61 |
2004 |
Norwegian Championship | C88 Ruy Lopez |
| 21. O Dannevig vs J Jansson |
| 1-0 | 40 |
2005 |
Norwegian Championship | C88 Ruy Lopez |
| 22. R Wessman vs J Jansson |
| 1-0 | 32 |
2005 |
21st European Club Cup | A80 Dutch |
| 23. B Byklum vs J Jansson |
| 1-0 | 24 |
2005 |
Norwegian Championship | B92 Sicilian, Najdorf, Opocensky Variation |
| 24. J Jansson vs J Horvath |
| 0-1 | 12 |
2005 |
21st European Club Cup | B23 Sicilian, Closed |
| 25. F Elsness vs J Jansson |
| 1-0 | 33 |
2005 |
Norwegian Championship | E38 Nimzo-Indian, Classical, 4...c5 |
