| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. O C Moen vs L Karlsson |
| 1-0 | 40 |
1981 |
9. Eksjo SK | B34 Sicilian, Accelerated Fianchetto |
| 2. Nunn vs L Karlsson |
| 1-0 | 34 |
1981 |
Helsinki | B32 Sicilian |
| 3. C Laird vs L Karlsson |
| 0-1 | 47 |
1981 |
Politiken Cup | B35 Sicilian, Accelerated Fianchetto, Modern Variation with Bc4 |
| 4. Sznapik vs L Karlsson |
| ½-½ | 30 |
1981 |
11. It | B32 Sicilian |
| 5. L Roos vs L Karlsson |
| ½-½ | 59 |
1981 |
Politiken Cup | B24 Sicilian, Closed |
| 6. L Orak vs L Karlsson |
| 0-1 | 58 |
1981 |
11. It | B35 Sicilian, Accelerated Fianchetto, Modern Variation with Bc4 |
| 7. L Kovacs vs L Karlsson |
| 0-1 | 57 |
1981 |
Politiken Cup | B22 Sicilian, Alapin |
| 8. Iskov vs L Karlsson |
| ½-½ | 72 |
1981 |
Svendborg DEN | B74 Sicilian, Dragon, Classical |
| 9. D Hansson vs L Karlsson |
| 0-1 | 39 |
1981 |
Politiken Cup | B35 Sicilian, Accelerated Fianchetto, Modern Variation with Bc4 |
| 10. Jansa vs L Karlsson |
| ½-½ | 20 |
1981 |
Vrnjacka Banja | B32 Sicilian |
| 11. A J Mestel vs L Karlsson |
| 1-0 | 41 |
1981 |
Esbjerg Vesterhav | B34 Sicilian, Accelerated Fianchetto |
| 12. S Taulbut vs L Karlsson |
| ½-½ | 25 |
1981 |
Politiken Cup | B30 Sicilian |
| 13. Murey vs L Karlsson |
| 1-0 | 41 |
1982 |
Luzern cq | B32 Sicilian |
| 14. A J Mestel vs L Karlsson |
| 1-0 | 39 |
1982 |
izt | B39 Sicilian, Accelerated Fianchetto, Breyer Variation |
| 15. Speelman vs L Karlsson |
| 0-1 | 43 |
1983 |
It (cat.8) | B70 Sicilian, Dragon Variation |
| 16. Speelman vs L Karlsson |
| 0-1 | 43 |
1983 |
Gladsaxe | B70 Sicilian, Dragon Variation |
| 17. Short vs L Karlsson |
 | ½-½ | 34 |
1983 |
Hastings | B76 Sicilian, Dragon, Yugoslav Attack |
| 18. Nunn vs L Karlsson |
| ½-½ | 22 |
1983 |
Helsinki | B76 Sicilian, Dragon, Yugoslav Attack |
| 19. Speelman vs L Karlsson |
| ½-½ | 14 |
1984 |
Hastings (England) | B37 Sicilian, Accelerated Fianchetto |
| 20. Kudrin vs L Karlsson |
| 0-1 | 51 |
1984 |
Hastings (England) | B32 Sicilian |
| 21. Kavalek vs L Karlsson |
| ½-½ | 17 |
1984 |
Olympiad | B38 Sicilian, Accelerated Fianchetto, Maroczy Bind, 6.Be3 |
| 22. Y Rantanen vs L Karlsson |
| 1-0 | 42 |
1986 |
Oslo | B71 Sicilian, Dragon, Levenfish Variation |
| 23. J M Hodgson vs L Karlsson |
| ½-½ | 8 |
1987 |
Tallinn | B39 Sicilian, Accelerated Fianchetto, Breyer Variation |
| 24. Hector vs L Karlsson |
 | 1-0 | 50 |
2003 |
Swedish Championships | B33 Sicilian |
| 25. T Wedberg vs L Karlsson |
| ½-½ | 31 |
2003 |
Swedish Championships | B38 Sicilian, Accelerated Fianchetto, Maroczy Bind, 6.Be3 |