| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Kraidman vs DeFirmian |
| 1-0 | 66 |
1978 |
London (England) | E43 Nimzo-Indian, Fischer Variation |
| 2. G Forintos vs DeFirmian |
| 1-0 | 28 |
1978 |
London (England) | E38 Nimzo-Indian, Classical, 4...c5 |
| 3. K Karlsson vs DeFirmian |
| ½-½ | 12 |
1981 |
Nis (Yugoslavia) | E38 Nimzo-Indian, Classical, 4...c5 |
| 4. Christiansen vs DeFirmian |
| ½-½ | 42 |
1983 |
Ch USA | E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation |
| 5. M Cebalo vs DeFirmian |
| 0-1 | 55 |
1983 |
It (cat.10) | E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation |
| 6. Gligoric vs DeFirmian |
 | 0-1 | 36 |
1983 |
Vrnjachka Banja (Yugoslavia) | E43 Nimzo-Indian, Fischer Variation |
| 7. Christiansen vs DeFirmian |
| ½-½ | 22 |
1984 |
Ch USA | E41 Nimzo-Indian |
| 8. S Agdestein vs DeFirmian |
| 0-1 | 35 |
1984 |
It ( cat. 13 ) | E41 Nimzo-Indian |
| 9. S Agdestein vs DeFirmian |
| 0-1 | 35 |
1985 |
Oslo (Norway) | E41 Nimzo-Indian |
| 10. Igor Ivanov vs DeFirmian |
| 1-0 | 35 |
1985 |
Berkeley | E30 Nimzo-Indian, Leningrad |
| 11. Hort vs DeFirmian |
| ½-½ | 31 |
1986 |
It ( cat. 12 ) | E31 Nimzo-Indian, Leningrad, Main line |
| 12. D Gurevich vs DeFirmian |
| 1-0 | 38 |
1986 |
USA-ch | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 13. A Lein vs DeFirmian |
| ½-½ | 50 |
1986 |
USA-ch | E43 Nimzo-Indian, Fischer Variation |
| 14. Miles vs DeFirmian |
| 1-0 | 68 |
1986 |
Reykjavik (Iceland) | E43 Nimzo-Indian, Fischer Variation |
| 15. J Benjamin vs DeFirmian |
| ½-½ | 16 |
1987 |
05, Los Angeles | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 16. B Zueger vs DeFirmian |
| 1-0 | 72 |
1987 |
It (open) | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 17. Remlinger vs DeFirmian |
| 0-1 | 69 |
1987 |
It (open) | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 18. J Benjamin vs DeFirmian |
| ½-½ | 44 |
1987 |
1, Estes Park USA ch | E32 Nimzo-Indian, Classical |
| 19. Gulko vs DeFirmian |
| ½-½ | 17 |
1988 |
USA-ch | E43 Nimzo-Indian, Fischer Variation |
| 20. Groszpeter vs DeFirmian |
| ½-½ | 11 |
1988 |
It (open) | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 21. Hort vs DeFirmian |
| ½-½ | 49 |
1989 |
Biel | E32 Nimzo-Indian, Classical |
| 22. Vaisser vs DeFirmian |
| 0-1 | 78 |
1989 |
Moscow | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 23. P Nikolic vs DeFirmian |
| ½-½ | 90 |
1989 |
Lugano (Switzerland) | E39 Nimzo-Indian, Classical, Pirc Variation |
| 24. Barbero vs DeFirmian |
| ½-½ | 29 |
1989 |
It (open) | E39 Nimzo-Indian, Classical, Pirc Variation |
| 25. Gulko vs DeFirmian |
| 1-0 | 31 |
1989 |
Long | E32 Nimzo-Indian, Classical |