| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. H Olafsson vs T Thorhallsson |
| 1-0 | 23 | 1995 | Reykjavik zt | D27 Queen's Gambit Accepted, Classical |
| 2. M Thuesen vs T Thorhallsson |
| 0-1 | 40 | 1997 | Politiken Cup | D27 Queen's Gambit Accepted, Classical |
| 3. S Pedersen vs T Thorhallsson |
| 0-1 | 63 | 1998 | Owens Corning | D27 Queen's Gambit Accepted, Classical |
| 4. A Gershon vs T Thorhallsson |
 | ½-½ | 96 | 1999 | Mermaid Beach Club | D27 Queen's Gambit Accepted, Classical |
| 5. G Grigore vs T Thorhallsson |
| ½-½ | 22 | 2000 | Istanbul Olympiad | D27 Queen's Gambit Accepted, Classical |
| 6. A Al-Rakib vs T Thorhallsson |
| 0-1 | 39 | 2000 | Istanbul Olympiad | D27 Queen's Gambit Accepted, Classical |
| 7. J C Alvarez Marquez vs T Thorhallsson |
| 0-1 | 33 | 2001 | Elbow Beach Club GM-B | D27 Queen's Gambit Accepted, Classical |
| 8. F Doettling vs T Thorhallsson |
| 1-0 | 33 | 2001 | Elbow Beach Club GM-B | D27 Queen's Gambit Accepted, Classical |
| 9. J A Nilssen vs T Thorhallsson |
| ½-½ | 25 | 2001 | Bergen Chess International | D27 Queen's Gambit Accepted, Classical |
| 10. M Konopka vs T Thorhallsson |
| ½-½ | 16 | 2001 | European Club Cup | D27 Queen's Gambit Accepted, Classical |
| 11. P Kiss vs T Thorhallsson |
| 0-1 | 68 | 2002 | Reykjavik Open | D27 Queen's Gambit Accepted, Classical |
| 12. T Bjornsson vs T Thorhallsson |
| 1-0 | 41 | 2003 | Reykjavik Edda rapid | D27 Queen's Gambit Accepted, Classical |
| 13. I Sokolov vs T Thorhallsson |
| ½-½ | 33 | 2003 | 2nd Milk Tournament | D27 Queen's Gambit Accepted, Classical |
| 14. A V Kharitonov vs T Thorhallsson |
| ½-½ | 50 | 2004 | Aeroflot Open | D27 Queen's Gambit Accepted, Classical |
| 15. D Issabayev vs T Thorhallsson |
| 0-1 | 46 | 2006 | Turin Olympiad | D27 Queen's Gambit Accepted, Classical |
| 16. R Duchene vs T Thorhallsson |
| ½-½ | 19 | 2007 | Politiken Cup | D27 Queen's Gambit Accepted, Classical |
| 17. B Thorfinnsson vs T Thorhallsson |
| ½-½ | 76 | 2012 | ch-ISL Playoff | D27 Queen's Gambit Accepted, Classical |
| 18. Z Tan vs T Thorhallsson |
| 0-1 | 53 | 2013 | Iceland-China Friendly Match | D27 Queen's Gambit Accepted, Classical |
| 19. J Schadd vs T Thorhallsson |
| 0-1 | 19 | 2013 | Reykjavik Open | D27 Queen's Gambit Accepted, Classical |
| 20. M Younus vs T Thorhallsson |
| ½-½ | 31 | 2014 | Tromso Olympiad | D27 Queen's Gambit Accepted, Classical |
| 21. B Briem vs T Thorhallsson |
| 0-1 | 56 | 2023 | Reykjavik Open | D27 Queen's Gambit Accepted, Classical |
Kibitzing
