| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. B Halldorsson vs S Thorhallsson |
 | 1-0 | 43 | 2013 | Reykjavik Open | D17 Queen's Gambit Declined Slav |
| 2. S Gueler vs S Thorhallsson |
| 1-0 | 46 | 2014 | Reykjavik Open | D19 Queen's Gambit Declined Slav, Dutch |
| 3. S Thorhallsson vs J Johannsdottir |
| 1-0 | 42 | 2014 | Reykjavik Open | D49 Queen's Gambit Declined Semi-Slav, Meran |
| 4. D Vanheirzeele vs S Thorhallsson |
| ½-½ | 25 | 2014 | Reykjavik Open | D02 Queen's Pawn Game |
| 5. S Thorhallsson vs F Restuccia |
| ½-½ | 58 | 2014 | Reykjavik Open | A57 Benko Gambit |
| 6. R Berg vs S Thorhallsson |
| 1-0 | 22 | 2014 | Reykjavik Open | D17 Queen's Gambit Declined Slav |
| 7. S Thorhallsson vs T Sielicki |
| 1-0 | 27 | 2014 | Reykjavik Open | A42 Modern Defense, Averbakh System |
| 8. S Thorhallsson vs J Wengler |
| 0-1 | 46 | 2014 | Reykjavik Open | A80 Dutch |
| 9. J Thiry vs S Thorhallsson |
| 1-0 | 62 | 2014 | Reykjavik Open | D00 Queen's Pawn Game |
| 10. S Thorhallsson vs E Hansen |
| 0-1 | 27 | 2015 | Reykjavik Open | D98 Grunfeld, Russian |
| 11. Hans K Gaarder vs S Thorhallsson |
| 0-1 | 23 | 2015 | Reykjavik Open | D08 Queen's Gambit Declined, Albin Counter Gambit |
| 12. S Thorhallsson vs R Preotu |
| 0-1 | 26 | 2015 | Reykjavik Open | A88 Dutch, Leningrad, Main Variation with c6 |
| 13. M Wahlbom vs S Thorhallsson |
| 0-1 | 34 | 2015 | Reykjavik Open | D47 Queen's Gambit Declined Semi-Slav |
| 14. S Thorhallsson vs S Tjomsland |
| 1-0 | 39 | 2015 | Reykjavik Open | E20 Nimzo-Indian |
| 15. A L'Ami vs S Thorhallsson |
| 1-0 | 31 | 2015 | Reykjavik Open | D44 Queen's Gambit Declined Semi-Slav |
| 16. S Thorhallsson vs P Haugli |
| 0-1 | 73 | 2015 | Reykjavik Open | E84 King's Indian, Samisch, Panno Main line |
| 17. S Thorhallsson vs J Haug |
| 0-1 | 39 | 2015 | Reykjavik Open | E46 Nimzo-Indian |
| 18. S Thorhallsson vs L O Hauge |
| 0-1 | 39 | 2016 | Reykjavik Open | A90 Dutch |
| 19. S Thorhallsson vs D Viana de Assis |
| 1-0 | 50 | 2016 | Reykjavik Open | A90 Dutch |
| 20. S Thorhallsson vs G Kjartansson |
| 0-1 | 45 | 2016 | Reykjavik Open | E00 Queen's Pawn Game |
| 21. E Hedman vs S Thorhallsson |
| 1-0 | 57 | 2016 | Reykjavik Open | D47 Queen's Gambit Declined Semi-Slav |
| 22. A Kazarian vs S Thorhallsson |
| ½-½ | 41 | 2016 | Reykjavik Open | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 23. S Thorhallsson vs S D Sigfusson |
| 0-1 | 35 | 2016 | Reykjavik Open | E98 King's Indian, Orthodox, Taimanov, 9.Ne1 |
| 24. T Valtysson vs S Thorhallsson |
| 0-1 | 33 | 2016 | Reykjavik Open | D02 Queen's Pawn Game |
| 25. J Sarkar vs S Thorhallsson |
| ½-½ | 48 | 2018 | Reykjavik Open | B30 Sicilian |
Kibitzing
