| 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. Judit Polgar vs G Gislason |
 | 1-0 | 105 |
1988 |
It ( shv. ) | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 3. Adorjan vs G Gislason |
| 1-0 | 44 |
1988 |
It (open) | A30 English, Symmetrical |
| 4. Zsuzsa Polgar vs G Gislason |
| 1-0 | 30 |
1988 |
Reykjavik | D93 Grunfeld, with Bf4 & e3 |
| 5. G Gislason vs Zsuzsa Polgar |
| 0-1 | 35 |
1988 |
It (open), Iceland | B83 Sicilian |
| 6. Petursson vs G Gislason |
| 1-0 | 47 |
1994 |
Ch Iceland Reykjavik (Iceland) | E71 King's Indian, Makagonov System (5.h3) |
| 7. G Gislason vs Kotronias |
| 0-1 | 30 |
1994 |
It (open) | E73 King's Indian |
| 8. G Gislason vs Bronstein |
| 0-1 | 47 |
1996 |
Reykjavik | A49 King's Indian, Fianchetto without c4 |
| 9. G Gislason vs Oral |
| 0-1 | 28 |
2001 |
ISL-chT 2000/01 | B49 Sicilian, Taimanov Variation |
| 10. G Gislason vs F Olafsson |
| 0-1 | 42 |
2001 |
Jonsson Mem Open | A46 Queen's Pawn Game |
| 11. S Kristjansson vs G Gislason |
| 1-0 | 32 |
2001 |
Jonsson Mem Open | B90 Sicilian, Najdorf |
| 12. G Gislason vs I Sokolov |
| 0-1 | 42 |
2001 |
Jonsson Mem Open | E60 King's Indian Defense |
| 13. Z Kozul vs G Gislason |
| 1-0 | 53 |
2008 |
Euro Club Cup | E98 King's Indian, Orthodox, Taimanov, 9.Ne1 |
| 14. Akopian vs G Gislason |
| 1-0 | 39 |
2008 |
Euro Club Cup | B80 Sicilian, Scheveningen |
| 15. Stefansson vs G Gislason |
| 1-0 | 58 |
2009 |
Reykjavik Open | E60 King's Indian Defense |
| 16. D E Cori Tello vs G Gislason |
| 1-0 | 38 |
2009 |
Reykjavik Open | E60 King's Indian Defense |
| 17. T Roussel Roozmon vs G Gislason |
| 1-0 | 27 |
2009 |
Reykjavik Open | E77 King's Indian |
| 18. E Player vs G Gislason |
| 1-0 | 37 |
2010 |
Reykjavik Open | B23 Sicilian, Closed |
| 19. G Gislason vs I Nyzhnyk |
| 0-1 | 23 |
2010 |
Reykjavik Open | D27 Queen's Gambit Accepted, Classical |
| 20. A Gupta vs G Gislason |
| 1-0 | 63 |
2010 |
Reykjavik Open | E83 King's Indian, Samisch |
| 21. E Najer vs G Gislason |
| 1-0 | 57 |
2011 |
European Club Cup | B48 Sicilian, Taimanov Variation |
| 22. G Gislason vs K Stupak |
| 0-1 | 54 |
2011 |
European Club Cup | E34 Nimzo-Indian, Classical, Noa Variation |
| 23. Sveshnikov vs G Gislason |
| 1-0 | 38 |
2011 |
Reykjavik Open | B22 Sicilian, Alapin |
| 24. G Gislason vs T Olafsson |
| 0-1 | 65 |
2012 |
Reykjavik Open | A15 English |
| 25. D Howell vs G Gislason |
| 1-0 | 36 |
2012 |
Tradewise Gibraltar | B06 Robatsch |
