| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. G Sigurjonsson vs Vasiukov |
| ½-½ | 38 |
1966 |
Reykjavik | A55 Old Indian, Main line |
| 2. G Sigurjonsson vs W G Addison |
| 0-1 | 39 |
1966 |
Havana ol (Men) | B56 Sicilian |
| 3. G Sigurjonsson vs Book |
| 0-1 | 42 |
1966 |
Reykjavik | C67 Ruy Lopez |
| 4. N Kerins vs G Sigurjonsson |
| ½-½ | 19 |
1967 |
WchT U26 | E84 King's Indian, Samisch, Panno Main line |
| 5. L Day vs G Sigurjonsson |
 | 1-0 | 28 |
1967 |
Wch U20 qual-A | B20 Sicilian |
| 6. G Sigurjonsson vs V Tukmakov |
| ½-½ | 69 |
1968 |
WchT U26 15th fin-A | B87 Sicilian, Fischer-Sozin with ...a6 and ...b5 |
| 7. Szabo vs G Sigurjonsson |
 | 0-1 | 40 |
1968 |
Reykjavik | D47 Queen's Gambit Declined Semi-Slav |
| 8. G Sigurjonsson vs A S Segal |
 | 1-0 | 26 |
1968 |
Ybbs | A52 Budapest Gambit |
| 9. Filip vs G Sigurjonsson |
| ½-½ | 71 |
1968 |
Lugano ol (Men) | A07 King's Indian Attack |
| 10. G Sigurjonsson vs A Prameshuber |
| 1-0 | 48 |
1968 |
Lugano ol (Men) fin-B | A14 English |
| 11. G Sigurjonsson vs Myagmarsuren |
| 0-1 | 59 |
1968 |
Lugano olm fB | A07 King's Indian Attack |
| 12. G Sigurjonsson vs Taimanov |
| 0-1 | 49 |
1968 |
Reykjavik | B48 Sicilian, Taimanov Variation |
| 13. W G Addison vs G Sigurjonsson |
| 1-0 | 25 |
1968 |
Reykjavik | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 14. G Sigurjonsson vs Vasiukov |
| ½-½ | 16 |
1968 |
Reykjavik | B43 Sicilian, Kan, 5.Nc3 |
| 15. Ivkov vs G Sigurjonsson |
| ½-½ | 19 |
1969 |
Raach zt | E69 King's Indian, Fianchetto, Classical Main line |
| 16. G Sigurjonsson vs Smejkal |
| 1-0 | 54 |
1969 |
Raach zt | C93 Ruy Lopez, Closed, Smyslov Defense |
| 17. H MacGrillen vs G Sigurjonsson |
| ½-½ | 47 |
1969 |
WchT U26 qual-A | E92 King's Indian |
| 18. Portisch vs G Sigurjonsson |
| 1-0 | 37 |
1969 |
Raach | E92 King's Indian |
| 19. G Sigurjonsson vs Uhlmann |
| 0-1 | 34 |
1969 |
Raach | C09 French, Tarrasch, Open Variation, Main line |
| 20. V Tukmakov vs G Sigurjonsson |
| ½-½ | 44 |
1969 |
WchT U26 qual-A | C09 French, Tarrasch, Open Variation, Main line |
| 21. I Radulov vs G Sigurjonsson |
| ½-½ | 47 |
1969 |
Raach zt | C15 French, Winawer |
| 22. J Dueball vs G Sigurjonsson |
| 1-0 | 41 |
1969 |
Raach zt | C16 French, Winawer |
| 23. G Sigurjonsson vs Slujssar |
| 1-0 | 27 |
1970 |
Caracas it | C00 French Defense |
| 24. G Sigurjonsson vs Bisguier |
| ½-½ | 38 |
1970 |
Caracas it | C79 Ruy Lopez, Steinitz Defense Deferred |
| 25. G Sigurjonsson vs V Ciocaltea |
| 1-0 | 23 |
1970 |
Caracas it | B21 Sicilian, 2.f4 and 2.d4 |