| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. Sosonko vs de Firmian |
| ½-½ | 25 | 1985 | Tunis Interzonal | A63 Benoni, Fianchetto, 9...Nbd7 |
| 2. Alburt vs de Firmian |
| 1-0 | 20 | 1985 | 86th US Open | A63 Benoni, Fianchetto, 9...Nbd7 |
| 3. Alburt vs de Firmian |
 | 1-0 | 34 | 1985 | United States Championship | A63 Benoni, Fianchetto, 9...Nbd7 |
| 4. P Nikolic vs de Firmian |
| 1-0 | 40 | 1986 | Hoogovens | A63 Benoni, Fianchetto, 9...Nbd7 |
| 5. J Brenninkmeijer vs de Firmian |
| ½-½ | 50 | 1989 | Lugano Open | A63 Benoni, Fianchetto, 9...Nbd7 |
| 6. V Akopian vs de Firmian |
| ½-½ | 41 | 1990 | Moscow GMA-qual f | A63 Benoni, Fianchetto, 9...Nbd7 |
| 7. P Glavina vs de Firmian |
| 1-0 | 42 | 1993 | 3rd Principe de Asturias rapid | A63 Benoni, Fianchetto, 9...Nbd7 |
| 8. D Gurevich vs de Firmian |
| ½-½ | 30 | 1994 | United States Championship | A63 Benoni, Fianchetto, 9...Nbd7 |
| 9. Kaidanov vs de Firmian |
| ½-½ | 44 | 1996 | United States Championship | A63 Benoni, Fianchetto, 9...Nbd7 |
| 10. P Nikolic vs de Firmian |
| 1-0 | 37 | 2003 | Greenland Open | A63 Benoni, Fianchetto, 9...Nbd7 |
| 11. L Day vs de Firmian |
| 0-1 | 51 | 2010 | Calgary International | A63 Benoni, Fianchetto, 9...Nbd7 |
| 12. Mikhalevski vs de Firmian |
| 1-0 | 36 | 2010 | Calgary International | A63 Benoni, Fianchetto, 9...Nbd7 |
Kibitzing
