| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. T Thorhallsson vs Petursson |
| ½-½ | 14 | 1986 | Icelandic Championship | B22 Sicilian, Alapin |
| 2. T Thorhallsson vs J Arnason |
| ½-½ | 18 | 1986 | Icelandic Championship | B22 Sicilian, Alapin |
| 3. T Thorhallsson vs Ivanchuk |
| ½-½ | 25 | 1986 | European Junior Championship 1986/87 | B22 Sicilian, Alapin |
| 4. T Thorhallsson vs Fedorowicz |
 | 0-1 | 24 | 1987 | 11th Lloyds Bank Masters Open | B22 Sicilian, Alapin |
| 5. T Thorhallsson vs D Anagnostopoulos |
| ½-½ | 27 | 1988 | Oakham Young Masters | B22 Sicilian, Alapin |
| 6. T Thorhallsson vs A Kochyev |
| 1-0 | 54 | 1990 | Copenhagen Open | B22 Sicilian, Alapin |
| 7. T Thorhallsson vs S Maksimovic |
| 1-0 | 41 | 1993 | Komotini GP | B22 Sicilian, Alapin |
| 8. T Thorhallsson vs A Tzoumbas |
| 1-0 | 35 | 1993 | Komotini GP | B22 Sicilian, Alapin |
| 9. T Thorhallsson vs M Darmarakis |
| 1-0 | 30 | 1993 | Katerini GP | B22 Sicilian, Alapin |
| 10. T Thorhallsson vs J Koch |
| ½-½ | 43 | 1993 | ISL-FRA | B22 Sicilian, Alapin |
| 11. T Thorhallsson vs G Gislason |
| 1-0 | 51 | 1994 | Kopavogur | B22 Sicilian, Alapin |
| 12. T Thorhallsson vs J Vidarsson |
| 1-0 | 22 | 1995 | Hafnarfjordur op | B22 Sicilian, Alapin |
| 13. T Thorhallsson vs E Gullaksen |
| 1-0 | 33 | 1995 | Hafnarfjordur op | B22 Sicilian, Alapin |
| 14. T Thorhallsson vs M Ulfarsson |
| 1-0 | 25 | 1996 | ISL-ch | B22 Sicilian, Alapin |
| 15. T Thorhallsson vs B Reichstein |
| 1-0 | 57 | 1996 | 24th World Open | B22 Sicilian, Alapin |
| 16. T Thorhallsson vs S Johnsen |
| 1-0 | 41 | 1996 | Troll Masters | B22 Sicilian, Alapin |
| 17. T Thorhallsson vs Van Wely |
| ½-½ | 28 | 1996 | New York Open | B22 Sicilian, Alapin |
| 18. T Thorhallsson vs J Hartung-Nielsen |
| 1-0 | 61 | 1997 | KS Sommerskak op | B22 Sicilian, Alapin |
| 19. T Thorhallsson vs M Bezold |
| ½-½ | 19 | 1997 | KS Sommerskak op | B22 Sicilian, Alapin |
| 20. T Thorhallsson vs O Kristjansson |
| ½-½ | 44 | 1998 | ISL-chT 9798 | B22 Sicilian, Alapin |
| 21. T Thorhallsson vs Jansa |
| ½-½ | 16 | 1998 | Owens Corning | B22 Sicilian, Alapin |
| 22. T Thorhallsson vs J Clavijo |
| 0-1 | 34 | 2008 | Dresden Olympiad | B22 Sicilian, Alapin |
| 23. T Thorhallsson vs S Bjornsson |
| ½-½ | 37 | 2009 | ch-ISL | B22 Sicilian, Alapin |
| 24. T Thorhallsson vs A Tate |
| 1-0 | 58 | 2014 | Tromso Olympiad | B22 Sicilian, Alapin |
| 25. T Thorhallsson vs Petursson |
| ½-½ | 12 | 2016 | TCh-ISL Div 1 -17 | B22 Sicilian, Alapin |
Kibitzing
