| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. DeFirmian vs H Olafsson |
| ½-½ | 18 |
1983 |
Bunadarbanka (Iceland) | B93 Sicilian, Najdorf, 6.f4 |
| 2. DeFirmian vs Barlov |
| 1-0 | 30 |
1983 |
Vrnjachka Banja (Yugoslavia) | B93 Sicilian, Najdorf, 6.f4 |
| 3. DeFirmian vs G Sigurjonsson |
| ½-½ | 38 |
1984 |
Bunadarbanka (Iceland) | B93 Sicilian, Najdorf, 6.f4 |
| 4. DeFirmian vs Browne |
| ½-½ | 19 |
1984 |
US-ch | B93 Sicilian, Najdorf, 6.f4 |
| 5. DeFirmian vs R Byrne |
| ½-½ | 28 |
1984 |
US-ch | B93 Sicilian, Najdorf, 6.f4 |
| 6. DeFirmian vs S Sandager |
| 1-0 | 25 |
1987 |
New York (USA) | B93 Sicilian, Najdorf, 6.f4 |
| 7. DeFirmian vs Gavrikov |
| ½-½ | 13 |
1989 |
Cup World (open) | B93 Sicilian, Najdorf, 6.f4 |
| 8. DeFirmian vs Richard Wade |
| 1-0 | 29 |
1989 |
National | B93 Sicilian, Najdorf, 6.f4 |
| 9. DeFirmian vs Ljubojevic |
| ½-½ | 20 |
1990 |
Manila (Philippines) | B93 Sicilian, Najdorf, 6.f4 |
| 10. DeFirmian vs Van Wely |
| ½-½ | 50 |
1994 |
Akureyri (Iceland) | B93 Sicilian, Najdorf, 6.f4 |
