| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Dolmatov vs J L Arnason |
| 1-0 | 44 |
1977 |
EU-ch 7778 U20 | B40 Sicilian |
| 2. J L Arnason vs K Mokry |
| 1-0 | 41 |
1977 |
EU-ch 7778 U20 | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 3. G Bordonada vs J L Arnason |
 | 1-0 | 33 |
1978 |
Buenos Aires ol (Men) | B33 Sicilian |
| 4. Lombardy vs J L Arnason |
| 1-0 | 37 |
1978 |
It (open) | B33 Sicilian |
| 5. J L Arnason vs G Kuzmin |
| 1-0 | 23 |
1978 |
Reykjavik Iceland ch | C34 King's Gambit Accepted |
| 6. Jansa vs J L Arnason |
 | 1-0 | 37 |
1979 |
Polanica Zdroj | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 7. J L Arnason vs A Planinc |
 | 1-0 | 17 |
1979 |
Rubinstein mem | C78 Ruy Lopez |
| 8. Vasiukov vs J L Arnason |
| 1-0 | 74 |
1979 |
Prague Bohemians | C76 Ruy Lopez, Modern Steinitz Defense, Fianchetto Variation |
| 9. Larsen vs J L Arnason |
 | 1-0 | 46 |
1980 |
Lone Pine | A20 English |
| 10. J L Arnason vs Christiansen |
 | 1-0 | 50 |
1980 |
Lone Pine | B16 Caro-Kann, Bronstein-Larsen Variation |
| 11. Adianto vs J L Arnason |
| 1-0 | 36 |
1980 |
Wch U20 | B83 Sicilian |
| 12. Van der Wiel vs J L Arnason |
 | 1-0 | 37 |
1980 |
Sochi | B83 Sicilian |
| 13. Ribli vs J L Arnason |
| 1-0 | 42 |
1980 |
Malta ol (Men) | A07 King's Indian Attack |
| 14. Vaganian vs J L Arnason |
| 1-0 | 28 |
1980 |
Sochi | D19 Queen's Gambit Declined Slav, Dutch |
| 15. J L Arnason vs Jansa |
| 1-0 | 37 |
1980 |
Sochi | B83 Sicilian |
| 16. Miles vs J L Arnason |
| 1-0 | 69 |
1981 |
Manchester | A56 Benoni Defense |
| 17. J L Arnason vs Seirawan |
| 1-0 | 44 |
1981 |
Lloyds Bank Masters | B18 Caro-Kann, Classical |
| 18. Igor Ivanov vs J L Arnason |
| 1-0 | 44 |
1981 |
Lone Pine | A65 Benoni, 6.e4 |
| 19. L Shamkovich vs J L Arnason |
| 1-0 | 58 |
1981 |
Lone Pine | B90 Sicilian, Najdorf |
| 20. J L Arnason vs Hjartarson |
| 1-0 | 24 |
1981 |
Ch Iceland | C34 King's Gambit Accepted |
| 21. J L Arnason vs J Jonsson |
| 1-0 | 31 |
1981 |
Ch Iceland | C36 King's Gambit Accepted, Abbazia Defense |
| 22. J L Arnason vs M Brooks |
| 1-0 | 38 |
1981 |
Lone Pine | B92 Sicilian, Najdorf, Opocensky Variation |
| 23. J L Arnason vs I D Wells |
| 1-0 | 36 |
1981 |
Manchester Benedictine Open | B17 Caro-Kann, Steinitz Variation |
| 24. J L Arnason vs V Zaltsman |
| 1-0 | 26 |
1982 |
Reykjavik op | E04 Catalan, Open, 5.Nf3 |
| 25. L Shamkovich vs J L Arnason |
| 1-0 | 61 |
1982 |
Brighton | A60 Benoni Defense |