| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. DeFirmian vs Suba |
| 1-0 | 38 |
1983 |
Vrsac | B82 Sicilian, Scheveningen |
| 2. DeFirmian vs Rohde |
| 1-0 | 36 |
1987 |
Estes Park | B82 Sicilian, Scheveningen |
| 3. DeFirmian vs Rohde |
 | 1-0 | 37 |
1987 |
Estes Park | B82 Sicilian, Scheveningen |
| 4. DeFirmian vs Vogt |
| ½-½ | 58 |
1988 |
Olympiad | B82 Sicilian, Scheveningen |
| 5. DeFirmian vs Polugaevsky |
| 0-1 | 53 |
1989 |
Biel | B82 Sicilian, Scheveningen |
| 6. DeFirmian vs Ehlvest |
| 0-1 | 26 |
1989 |
Reggio Emilia8990 | B82 Sicilian, Scheveningen |
| 7. DeFirmian vs Polugaevsky |
| 0-1 | 38 |
1990 |
It (cat.14) | B82 Sicilian, Scheveningen |
| 8. DeFirmian vs Yudasin |
| 1-0 | 24 |
1990 |
Manila Interzonal | B82 Sicilian, Scheveningen |
| 9. DeFirmian vs Dao Thien Hai |
| 1-0 | 32 |
1990 |
Olympiad | B82 Sicilian, Scheveningen |
| 10. DeFirmian vs Ehlvest |
| 0-1 | 26 |
1990 |
Reggio Emilia (Italy) | B82 Sicilian, Scheveningen |
| 11. DeFirmian vs A Sokolov |
| ½-½ | 42 |
1990 |
Reykjavik (Iceland) | B82 Sicilian, Scheveningen |
| 12. DeFirmian vs J Gallagher |
| ½-½ | 62 |
1993 |
It (open) | B82 Sicilian, Scheveningen |
| 13. DeFirmian vs W Haist |
| 1-0 | 35 |
1994 |
It (open) | B82 Sicilian, Scheveningen |
| 14. DeFirmian vs Z Izoria |
| ½-½ | 25 |
2006 |
National Open | B82 Sicilian, Scheveningen |
