| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. H S Gretarsson vs J Aabling-Thomsen |
| 1-0 | 38 |
2006 |
Politiken Cup | A29 English, Four Knights, Kingside Fianchetto |
| 2. S Christensen vs H S Gretarsson |
| ½-½ | 56 |
2006 |
Politiken Cup | B22 Sicilian, Alapin |
| 3. H S Gretarsson vs Vaganian |
| 0-1 | 38 |
2006 |
Politiken Cup | E08 Catalan, Closed |
| 4. H S Gretarsson vs Ermenkov |
| 0-1 | 61 |
2006 |
XXII Reykjavik Open | A04 Reti Opening |
| 5. R Hardarson vs H S Gretarsson |
| ½-½ | 10 |
2007 |
? | E92 King's Indian |
| 6. Stripunsky vs H S Gretarsson |
| 1-0 | 67 |
2007 |
Politiken Cup | A11 English, Caro-Kann Defensive System |
| 7. H S Gretarsson vs A Wagener |
| 1-0 | 64 |
2007 |
? | A89 Dutch, Leningrad, Main Variation with Nc6 |
| 8. H S Gretarsson vs Holzke |
| 0-1 | 53 |
2007 |
Politiken Cup | D17 Queen's Gambit Declined Slav |
| 9. H S Gretarsson vs S Christensen |
 | 0-1 | 63 |
2007 |
Politiken Cup | A29 English, Four Knights, Kingside Fianchetto |
| 10. S Wehmeier vs H S Gretarsson |
| 1-0 | 34 |
2007 |
? | D00 Queen's Pawn Game |
| 11. D Werner vs H S Gretarsson |
| 1-0 | 29 |
2007 |
First Saturday June | D11 Queen's Gambit Declined Slav |
| 12. S D Sigfusson vs H S Gretarsson |
| ½-½ | 45 |
2007 |
Kaupthing IM Tournament | E81 King's Indian, Samisch |
| 13. V Nithander vs H S Gretarsson |
| 0-1 | 67 |
2007 |
Politiken Cup | B60 Sicilian, Richter-Rauzer |
| 14. H S Gretarsson vs E Kahn |
| ½-½ | 54 |
2007 |
First Saturday June | A21 English |
| 15. H S Gretarsson vs M Bakalarz |
| ½-½ | 63 |
2007 |
? | A22 English |
| 16. T Hirneise vs H S Gretarsson |
| 1-0 | 62 |
2007 |
Politiken Cup | C60 Ruy Lopez |
| 17. H S Gretarsson vs Potkin |
| ½-½ | 30 |
2008 |
Euro Club Cup | D45 Queen's Gambit Declined Semi-Slav |
| 18. H S Gretarsson vs J Holvason |
| 1-0 | 39 |
2008 |
EU-ch U16 18th | E81 King's Indian, Samisch |
| 19. H S Gretarsson vs B Magnusson |
| 1-0 | 52 |
2008 |
Reykjavik Open | B07 Pirc |
| 20. H Tamazyan vs H S Gretarsson |
| 0-1 | 32 |
2008 |
EU-ch U16 18th | B40 Sicilian |
| 21. H S Gretarsson vs H Westerinen |
| ½-½ | 62 |
2008 |
Reykjavik Open | E81 King's Indian, Samisch |
| 22. H S Gretarsson vs L Andonovski |
| 1-0 | 41 |
2008 |
Euro Club Cup | D12 Queen's Gambit Declined Slav |
| 23. M Kamali vs H S Gretarsson |
| 0-1 | 29 |
2008 |
EU-ch U16 18th | B48 Sicilian, Taimanov Variation |
| 24. D Bojkov vs H S Gretarsson |
| 1-0 | 55 |
2008 |
Reykjavik Open | B40 Sicilian |
| 25. A Olsson vs H S Gretarsson |
| 1-0 | 40 |
2008 |
Euro Club Cup | B23 Sicilian, Closed |