| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. G Gislason vs S Lilienthal |
| 0-1 | 54 | 1984 | EU-ch GT231 corr | B09 Pirc, Austrian Attack |
| 2. W J Donaldson vs G Gislason |
| 1-0 | 28 | 1986 | Reykjavik Open | E91 King's Indian |
| 3. G Gislason vs H R Jung |
| 0-1 | 28 | 1986 | Reykjavik Open | D02 Queen's Pawn Game |
| 4. L Josteinsson vs G Gislason |
| 1-0 | 28 | 1986 | Reykjavik Open | E15 Queen's Indian |
| 5. L Johannesson vs G Gislason |
| 0-1 | 28 | 1986 | Reykjavik Open | C19 French, Winawer, Advance |
| 6. G Gislason vs H Einarsson |
| 1-0 | 38 | 1986 | Reykjavik Open | E69 King's Indian, Fianchetto, Classical Main line |
| 7. G Gislason vs Petursson |
| ½-½ | 67 | 1988 | Reykjavik Open | E11 Bogo-Indian Defense |
| 8. S Polgar vs G Gislason |
| 1-0 | 30 | 1988 | Reykjavik Open | D93 Grunfeld, with Bf4 & e3 |
| 9. G Gislason vs B Palsson |
| 1-0 | 22 | 1988 | Reykjavik Open | D49 Queen's Gambit Declined Semi-Slav, Meran |
| 10. G Gislason vs B Ostenstad |
| ½-½ | 45 | 1988 | Reykjavik Open | E15 Queen's Indian |
| 11. L Johannesson vs G Gislason |
| 0-1 | 51 | 1988 | Reykjavik Open | B72 Sicilian, Dragon |
| 12. G Gislason vs R Akesson |
| 1-0 | 48 | 1988 | Reykjavik Open | E48 Nimzo-Indian, 4.e3 O-O 5.Bd3 d5 |
| 13. Adorjan vs G Gislason |
| 1-0 | 44 | 1988 | Reykjavik Open | A30 English, Symmetrical |
| 14. J Polgar vs G Gislason |
 | 1-0 | 105 | 1988 | Reykjavik Open | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 15. G Gislason vs S Polgar |
| 0-1 | 35 | 1988 | Reykjavik Open | B83 Sicilian |
| 16. G Gislason vs A Thorsteinsson |
| 1-0 | 38 | 1988 | Reykjavik Open | A25 English |
| 17. K Thorsteins vs G Gislason |
| 1-0 | 26 | 1989 | ISL-ch | D87 Grunfeld, Exchange |
| 18. T Wedberg vs G Gislason |
| 1-0 | 28 | 1990 | Reykjavik Open | B80 Sicilian, Scheveningen |
| 19. G Gislason vs S D Sigfusson |
| 1-0 | 36 | 1990 | Reykjavik Open | D15 Queen's Gambit Declined Slav |
| 20. J Tisdall vs G Gislason |
| 1-0 | 43 | 1990 | Reykjavik Open | E92 King's Indian |
| 21. G Gislason vs T Thorhallsson |
| 0-1 | 36 | 1990 | Reykjavik Open | D43 Queen's Gambit Declined Semi-Slav |
| 22. A Gunnarsson vs G Gislason |
| 0-1 | 54 | 1990 | Reykjavik Open | A56 Benoni Defense |
| 23. G Gislason vs O Brendel |
| 1-0 | 35 | 1990 | Reykjavik Open | E70 King's Indian |
| 24. G Gislason vs C Becx |
| 1-0 | 62 | 1990 | Reykjavik Open | A89 Dutch, Leningrad, Main Variation with Nc6 |
| 25. J Arnason vs G Gislason |
| 1-0 | 38 | 1990 | Reykjavik Open | B81 Sicilian, Scheveningen, Keres Attack |
Kibitzing
