| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. A Savage vs R Hardarson |
| 1-0 | 42 |
1982 |
Reykjavik op | A45 Queen's Pawn Game |
| 2. R Hardarson vs Petursson |
| 0-1 | 37 |
1984 |
Neskaupsstadur Icela | B32 Sicilian |
| 3. Reshevsky vs R Hardarson |
| 1-0 | 35 |
1984 |
Reykjavik Open | A77 Benoni, Classical, 9...Re8, 10.Nd2 |
| 4. R Hardarson vs D King |
| 0-1 | 24 |
1984 |
Reykjavik | B93 Sicilian, Najdorf, 6.f4 |
| 5. B Benediktsson vs R Hardarson |
| 0-1 | 32 |
1984 |
Neskaupstad+ | E00 Queen's Pawn Game |
| 6. Lombardy vs R Hardarson |
| 1-0 | 61 |
1984 |
Neskaupsstadur (Iceland) | A25 English |
| 7. R Hardarson vs P Petursson |
| 1-0 | 29 |
1984 |
It Reykjavik (Iceland) (226) | B32 Sicilian |
| 8. K Burger vs R Hardarson |
| ½-½ | 38 |
1984 |
It (open) | A77 Benoni, Classical, 9...Re8, 10.Nd2 |
| 9. Petursson vs R Hardarson |
| 1-0 | 37 |
1984 |
It op | E10 Queen's Pawn Game |
| 10. R Hardarson vs E Schiller |
| 1-0 | 30 |
1986 |
It (open) | B17 Caro-Kann, Steinitz Variation |
| 11. A Thorsteinsson vs R Hardarson |
| ½-½ | 54 |
1988 |
It (open) | C55 Two Knights Defense |
| 12. Dolmatov vs R Hardarson |
| 1-0 | 30 |
1988 |
It (open) | C55 Two Knights Defense |
| 13. R Hardarson vs Hjartarson |
| 0-1 | 30 |
1991 |
ISL-ch | B21 Sicilian, 2.f4 and 2.d4 |
| 14. H Westerinen vs R Hardarson |
| 1-0 | 27 |
1997 |
It open | C30 King's Gambit Declined |
| 15. R Hardarson vs R Akesson |
| 0-1 | 34 |
1998 |
4th Gudmundur Arason | B06 Robatsch |
| 16. R Hardarson vs B Einarsson |
| 1-0 | 52 |
1998 |
ch-ISL | B21 Sicilian, 2.f4 and 2.d4 |
| 17. R Hardarson vs A Moller |
| 1-0 | 34 |
1999 |
Politiken Cup | B21 Sicilian, 2.f4 and 2.d4 |
| 18. R Hardarson vs DeFirmian |
 | ½-½ | 22 |
1999 |
Politiken Cup 21st | B21 Sicilian, 2.f4 and 2.d4 |
| 19. R Hardarson vs A Gunnarsson |
| ½-½ | 22 |
2000 |
Reykjavik op19 | C45 Scotch Game |
| 20. R Hardarson vs A Schmied |
| 1-0 | 26 |
2000 |
Reykjavik op19 | B74 Sicilian, Dragon, Classical |
| 21. J Fridjonsson vs R Hardarson |
| ½-½ | 39 |
2000 |
Reykjavik op19 | A34 English, Symmetrical |
| 22. K Edvardsson vs R Hardarson |
| 1-0 | 17 |
2000 |
Reykjavik op19 | A46 Queen's Pawn Game |
| 23. R Hardarson vs Conquest |
| 0-1 | 41 |
2000 |
Reykjavik op19 | B21 Sicilian, 2.f4 and 2.d4 |
| 24. R Hardarson vs S Kasparov |
| 0-1 | 27 |
2000 |
KB Czech Open | B18 Caro-Kann, Classical |
| 25. R Hardarson vs G Kjartansson |
| 0-1 | 28 |
2000 |
Reykjavik op19 | B18 Caro-Kann, Classical |