| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Benites vs I Asmundsson |
| 0-1 | 39 |
1957 |
WchT U26 04th | E98 King's Indian, Orthodox, Taimanov, 9.Ne1 |
| 2. I Asmundsson vs Feuerstein |
| 0-1 | 41 |
1957 |
WchT U26 04th | A32 English, Symmetrical Variation |
| 3. B Andersen vs I Asmundsson |
| 0-1 | 38 |
1957 |
WchT U26 04th | E80 King's Indian, Samisch Variation |
| 4. I Asmundsson vs A Sydor |
| 0-1 | 41 |
1958 |
WchT U26 fin-B 05th | D47 Queen's Gambit Declined Semi-Slav |
| 5. I Asmundsson vs A Kolarov |
| 0-1 | 59 |
1958 |
WchT U26 prel-B 05th | E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation |
| 6. I Asmundsson vs S Johannessen |
| 0-1 | 33 |
1964 |
Reykjavik | C70 Ruy Lopez |
| 7. I Asmundsson vs G Palmason |
| 0-1 | 28 |
1964 |
Reykjavik | E25 Nimzo-Indian, Samisch |
| 8. I Asmundsson vs J Kristinsson |
| 0-1 | 41 |
1964 |
Reykjavik | B56 Sicilian |
| 9. I Asmundsson vs A Cavilhas Rocha |
| 0-1 | 21 |
1968 |
Lugano ol (Men) fin-B | A20 English |
| 10. M Basman vs I Asmundsson |
| 0-1 | 39 |
1968 |
Lugano ol (Men) fin-B | C16 French, Winawer |
| 11. I Asmundsson vs O Magnusson |
| 0-1 | 48 |
1973 |
ISL-ch playoff | C11 French |
| 12. B Halldorsson vs I Asmundsson |
| 0-1 | 41 |
1973 |
ISL-ch | E81 King's Indian, Samisch |
| 13. J Thorvaldsson vs I Asmundsson |
| 0-1 | 40 |
1974 |
ISL-ch | A09 Reti Opening |
| 14. T Knight vs I Asmundsson |
 | 0-1 | 24 |
1974 |
Nice ol (Men) qual-E | B03 Alekhine's Defense |
| 15. I Asmundsson vs S Kagan |
| 0-1 | 40 |
1974 |
Nice ol (Men) fin-B | B06 Robatsch |
| 16. J Kristinsson vs I Asmundsson |
| 0-1 | 59 |
1974 |
ISL-ch playoff | A80 Dutch |
| 17. I Asmundsson vs J Ulrichsen |
 | 0-1 | 32 |
1974 |
Nice ol (Men) fin-B | B30 Sicilian |
| 18. A Karason vs I Asmundsson |
| 0-1 | 33 |
1974 |
ISL-ch | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 19. I Asmundsson vs F Thorbergsson |
| 0-1 | 55 |
1974 |
ISL-ch | A15 English |
| 20. S Bjarnason vs I Asmundsson |
| 0-1 | 36 |
1974 |
ISL-ch | B05 Alekhine's Defense, Modern |
| 21. J Ferreira vs I Asmundsson |
| 0-1 | 41 |
1978 |
Buenos Aires ol (Men) | A92 Dutch |
| 22. A Gamboa vs I Asmundsson |
| 0-1 | 41 |
1978 |
Buenos Aires ol (Men) | A01 Nimzovich-Larsen Attack |
| 23. J A Palsson vs I Asmundsson |
| 0-1 | 51 |
1979 |
ISL-ch | D13 Queen's Gambit Declined Slav, Exchange Variation |
| 24. Angantysson vs I Asmundsson |
| 0-1 | 51 |
1979 |
ISL-ch | C77 Ruy Lopez |
| 25. I Asmundsson vs Hjartarson |
| 0-1 | 52 |
1979 |
ISL-ch | B22 Sicilian, Alapin |