| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. B Halldorsson vs I Asmundsson |
| 0-1 | 41 |
1973 |
ISL-ch | E81 King's Indian, Samisch |
| 2. I Asmundsson vs B Halldorsson |
| 1-0 | 58 |
1979 |
ISL-ch | B11 Caro-Kann, Two Knights, 3...Bg4 |
| 3. K Burger vs B Halldorsson |
| 1-0 | 60 |
1984 |
It (open) | D17 Queen's Gambit Declined Slav |
| 4. B Benediktsson vs B Halldorsson |
 | 0-1 | 37 |
1984 |
Reykjavik op | B12 Caro-Kann Defense |
| 5. B Halldorsson vs Reshevsky |
| 1-0 | 67 |
1986 |
Reykjavik open | E12 Queen's Indian |
| 6. Kotronias vs B Halldorsson |
| 1-0 | 31 |
1988 |
It ( shv. ) | B12 Caro-Kann Defense |
| 7. Dolmatov vs B Halldorsson |
| 1-0 | 54 |
1988 |
Reykjavik op | B14 Caro-Kann, Panov-Botvinnik Attack |
| 8. B Halldorsson vs H Marks |
| ½-½ | 77 |
2000 |
Reykjavik op19 | A17 English |
| 9. A Schmied vs B Halldorsson |
| ½-½ | 69 |
2000 |
Reykjavik op19 | B13 Caro-Kann, Exchange |
| 10. Jonkman vs B Halldorsson |
| 1-0 | 50 |
2000 |
Reykjavik op19 | B19 Caro-Kann, Classical |
| 11. B Halldorsson vs I Sokolov |
| 0-1 | 29 |
2000 |
Reykjavik op19 | E25 Nimzo-Indian, Samisch |
| 12. B Halldorsson vs S De Blecourt |
| 1-0 | 32 |
2000 |
Reykjavik op19 | D44 Queen's Gambit Declined Semi-Slav |
| 13. B Halldorsson vs J Gunnarsson |
| ½-½ | 10 |
2000 |
Reykjavik op19 | A57 Benko Gambit |
| 14. Agrest vs B Halldorsson |
 | 1-0 | 31 |
2000 |
Reykjavik op19 | D45 Queen's Gambit Declined Semi-Slav |
| 15. R Soupizon vs B Halldorsson |
| 0-1 | 36 |
2000 |
Reykjavik op19 | B15 Caro-Kann |
| 16. B Halldorsson vs O Hannesson |
| 1-0 | 51 |
2000 |
Reykjavik op19 | A47 Queen's Indian |
| 17. Jonas Jonasson vs B Halldorsson |
| 0-1 | 51 |
2001 |
ISL-chT 2000/01 | D19 Queen's Gambit Declined Slav, Dutch |
| 18. B Halldorsson vs B Socko |
| 0-1 | 41 |
2003 |
European Clubs Cup (Men) | E25 Nimzo-Indian, Samisch |
| 19. E Thorsteinsson vs B Halldorsson |
| 0-1 | 65 |
2004 |
Reykjavik Open | B10 Caro-Kann |
| 20. B Halldorsson vs T Bromann |
| ½-½ | 54 |
2004 |
Reykjavik Open | E32 Nimzo-Indian, Classical |
| 21. B Halldorsson vs D Kjartansson |
| 0-1 | 27 |
2004 |
Reykjavik Open | E92 King's Indian |
| 22. S Thorkelsson vs B Halldorsson |
| 0-1 | 71 |
2004 |
Reykjavik Open | B12 Caro-Kann Defense |
| 23. I Johannesson vs B Halldorsson |
| ½-½ | 50 |
2004 |
Reykjavik Open | D45 Queen's Gambit Declined Semi-Slav |
| 24. B Halldorsson vs S Erenburg |
| 0-1 | 24 |
2004 |
Reykjavik Open | D43 Queen's Gambit Declined Semi-Slav |
| 25. B Halldorsson vs P Thorarinsson |
| ½-½ | 46 |
2004 |
Reykjavik Open | E20 Nimzo-Indian |