| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. J Jansson vs A Frois |
| 0-1 | 48 |
1981 |
EU-ch jr | B23 Sicilian, Closed |
| 2. S James vs J Jansson |
| 0-1 | 47 |
1981 |
EU-ch jr | E73 King's Indian |
| 3. J Jansson vs G Siegel |
| 0-1 | 50 |
1981 |
EU-ch jr | B21 Sicilian, 2.f4 and 2.d4 |
| 4. J Jansson vs T Karolyi Jr. |
| 0-1 | 50 |
1981 |
EU-ch jr | D01 Richter-Veresov Attack |
| 5. T Brionne vs J Jansson |
| 0-1 | 41 |
1981 |
EU-ch jr | A42 Modern Defense, Averbakh System |
| 6. J Jansson vs Jansa |
| 0-1 | 51 |
1987 |
Gausdal | A10 English |
| 7. P Lyrberg vs J Jansson |
| 0-1 | 42 |
1994 |
Oslo-op | A55 Old Indian, Main line |
| 8. D Hersvik vs J Jansson |
| 0-1 | 45 |
2001 |
TCh-NOR Final | B96 Sicilian, Najdorf |
| 9. O Hole vs J Jansson |
 | 0-1 | 34 |
2001 |
TCh-NOR Final | A04 Reti Opening |
| 10. J Jansson vs H Harestad |
| 0-1 | 37 |
2001 |
TCh-NOR Final | A15 English |
| 11. E Bennett vs J Jansson |
| 0-1 | 43 |
2001 |
ECC | E12 Queen's Indian |
| 12. J Jansson vs A Maljush |
| 0-1 | 32 |
2001 |
ECC | D78 Neo-Grunfeld, 6.O-O c6 |
| 13. J Jansson vs G Meins |
| 0-1 | 28 |
2003 |
European Clubs Cup (Men) | A06 Reti Opening |
| 14. J Jansson vs O Dannevig |
| 0-1 | 81 |
2004 |
Norwegian Championship | A46 Queen's Pawn Game |
| 15. Leer-Salvesen vs J Jansson |
| 0-1 | 40 |
2004 |
Norwegian Championship | D46 Queen's Gambit Declined Semi-Slav |
| 16. J Jansson vs J Horvath |
| 0-1 | 12 |
2005 |
21st European Club Cup | B23 Sicilian, Closed |
| 17. J Jansson vs Leer-Salvesen |
| 0-1 | 33 |
2005 |
Norwegian Championship | D52 Queen's Gambit Declined |
| 18. S Bjerke vs J Jansson |
| 0-1 | 38 |
2005 |
Norwegian Championship | E38 Nimzo-Indian, Classical, 4...c5 |
| 19. M Erdogdu vs J Jansson |
| 0-1 | 45 |
2005 |
21st European Club Cup | B90 Sicilian, Najdorf |
| 20. J L Hammer vs J Jansson |
| 0-1 | 36 |
2005 |
Norwegian Championship | D00 Queen's Pawn Game |
| 21. S Heim vs J Jansson |
| 0-1 | 47 |
2005 |
21st European Club Cup | B90 Sicilian, Najdorf |
| 22. D Madsen vs J Jansson |
 | 0-1 | 43 |
2006 |
Norwegian Championship | A87 Dutch, Leningrad, Main Variation |
| 23. R Saunders vs J Jansson |
 | 0-1 | 60 |
2006 |
European Club Cup | B23 Sicilian, Closed |
| 24. J Jansson vs K Stokke |
| 0-1 | 50 |
2006 |
Norwegian Championship | A04 Reti Opening |
| 25. J Jansson vs T Gabrielsen |
| 0-1 | 27 |
2006 |
Norwegian Championship | B23 Sicilian, Closed |