| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. D Gurevich vs DeFirmian |
| 1-0 | 38 |
1986 |
USA-ch | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 2. J Benjamin vs DeFirmian |
| ½-½ | 16 |
1987 |
05, Los Angeles | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 3. Remlinger vs DeFirmian |
| 0-1 | 69 |
1987 |
It (open) | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 4. B Zueger vs DeFirmian |
| 1-0 | 72 |
1987 |
It (open) | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 5. Groszpeter vs DeFirmian |
| ½-½ | 11 |
1988 |
It (open) | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 6. Vaisser vs DeFirmian |
| 0-1 | 78 |
1989 |
Moscow | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 7. Huebner vs DeFirmian |
| 1-0 | 40 |
1990 |
Cup World (select) | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 8. Speelman vs DeFirmian |
| 1-0 | 55 |
1992 |
Brussels (Belgium) | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 9. Shirov vs DeFirmian |
| ½-½ | 71 |
1993 |
Tilburg (Netherlands) | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 10. M Pein vs DeFirmian |
 | ½-½ | 66 |
1995 |
It (a) | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 11. Shabalov vs DeFirmian |
| 1-0 | 24 |
1995 |
Philadelphia, PA USA | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 12. Nakamura vs DeFirmian |
| ½-½ | 44 |
2003 |
US Championships 2003 | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
