| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Kraidman vs DeFirmian |
| 1-0 | 66 |
1978 |
London (England) | E43 Nimzo-Indian, Fischer Variation |
| 2. Gligoric vs DeFirmian |
 | 0-1 | 36 |
1983 |
Vrnjachka Banja (Yugoslavia) | E43 Nimzo-Indian, Fischer Variation |
| 3. Miles vs DeFirmian |
| 1-0 | 68 |
1986 |
Reykjavik (Iceland) | E43 Nimzo-Indian, Fischer Variation |
| 4. A Lein vs DeFirmian |
| ½-½ | 50 |
1986 |
USA-ch | E43 Nimzo-Indian, Fischer Variation |
| 5. Gulko vs DeFirmian |
| ½-½ | 17 |
1988 |
USA-ch | E43 Nimzo-Indian, Fischer Variation |
| 6. M Tataev vs DeFirmian |
| 1-0 | 51 |
1991 |
It (open) | E43 Nimzo-Indian, Fischer Variation |
| 7. Gelfand vs DeFirmian |
| ½-½ | 61 |
1995 |
It (cat.15) | E43 Nimzo-Indian, Fischer Variation |
| 8. V Milov vs DeFirmian |
| 1-0 | 40 |
1995 |
It (cat.15) | E43 Nimzo-Indian, Fischer Variation |
| 9. Dzindzichashvili vs DeFirmian |
| ½-½ | 59 |
1996 |
It (cat.13) | E43 Nimzo-Indian, Fischer Variation |
| 10. Radjabov vs DeFirmian |
| 1-0 | 51 |
2001 |
Sigeman & Co | E43 Nimzo-Indian, Fischer Variation |
| 11. E Zude vs DeFirmian |
| ½-½ | 73 |
2007 |
Politiken Cup | E43 Nimzo-Indian, Fischer Variation |
| 12. J Bartholomew vs DeFirmian |
| 0-1 | 64 |
2010 |
Philadelphia Open | E43 Nimzo-Indian, Fischer Variation |
