| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 226. S Arnalds vs G Gislason |
| 0-1 | 33 | 2017 | Reykjavik Open | E83 King's Indian, Samisch |
| 227. G Gislason vs H Heimisson |
| 1-0 | 55 | 2017 | Reykjavik Open | D10 Queen's Gambit Declined Slav |
| 228. B Thorfinnsson vs G Gislason |
| 1-0 | 34 | 2017 | ch-ISL | B06 Robatsch |
| 229. G Kjartansson vs G Gislason |
| 1-0 | 55 | 2017 | ch-ISL | B06 Robatsch |
| 230. H Olafsson vs G Gislason |
| 0-1 | 38 | 2017 | ISL-chT Div 1 2017/18 | A37 English, Symmetrical |
| 231. G Gajewski vs G Gislason |
| 1-0 | 31 | 2017 | ISL-chT Div 1 2017/18 | D74 Neo-Grunfeld, 6.cd Nxd5, 7.O-O |
| 232. A Kveinys vs G Gislason |
| 1-0 | 26 | 2017 | Northern Lights Open | B06 Robatsch |
| 233. G Gislason vs S Williams |
| 0-1 | 22 | 2017 | Northern Lights Open | A04 Reti Opening |
| 234. M Hebden vs G Gislason |
| ½-½ | 55 | 2017 | Northern Lights Open | A45 Queen's Pawn Game |
| 235. A Domalchuk-Jonasson vs G Gislason |
| 1-0 | 60 | 2024 | Icelandic Team Championship 2023/24 | A10 English |
| 236. G Nagy vs G Gislason |
| 1-0 | 51 | 2024 | Icelandic Team Championship 2023/24 | E67 King's Indian, Fianchetto |
| 237. G Gislason vs A Gunnarsson |
| ½-½ | 56 | 2024 | Icelandic Team Championship 2023/24 | A14 English |
| 238. G Gislason vs B Thorfinnsson |
| ½-½ | 44 | 2024 | Icelandic Team Championship 2023/24 | A13 English |
| 239. T Laurusas vs G Gislason |
| 1-0 | 57 | 2024 | Icelandic Team Championship 2023/24 | E92 King's Indian |
| 240. G Gislason vs H Steingrimsson |
| 0-1 | 40 | 2024 | Reykjavik Open | A33 English, Symmetrical |
| 241. S Royal vs G Gislason |
 | 1-0 | 25 | 2025 | Reykjavik Open | E97 King's Indian |
| 242. C James vs G Gislason |
| 0-1 | 40 | 2025 | Reykjavik Open | A07 King's Indian Attack |
| 243. G Gislason vs M Lu |
| 0-1 | 32 | 2025 | Reykjavik Open | D02 Queen's Pawn Game |
| 244. Z Saine vs G Gislason |
| 0-1 | 40 | 2025 | Reykjavik Open | B06 Robatsch |
| 245. G Gislason vs V Larkin |
| ½-½ | 51 | 2025 | Reykjavik Open | A46 Queen's Pawn Game |
| 246. S Zierk vs G Gislason |
| 1-0 | 25 | 2025 | Reykjavik Open | B06 Robatsch |
Kibitzing
