| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. M Diesen vs de Firmian |
| 1-0 | 32 | 1976 | United States Championship (Juniors) | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 2. K Spraggett vs de Firmian |
 | 0-1 | 37 | 1976 | 13th Canadian Open | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 3. Kudrin vs de Firmian |
| 1-0 | 38 | 1983 | United States Championship | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 4. A Ivanov vs de Firmian |
| ½-½ | 44 | 1989 | New York Open | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 5. A Ivanov vs de Firmian |
| ½-½ | 58 | 1989 | United States Championship | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 6. Kudrin vs de Firmian |
| ½-½ | 60 | 1993 | New York Open | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 7. Kudrin vs de Firmian |
| 0-1 | 53 | 1993 | 21st World Open | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 8. A Ivanov vs de Firmian |
| ½-½ | 20 | 1995 | Bermuda-A | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 9. I Rausis vs de Firmian |
| ½-½ | 10 | 1999 | Las Palmas Open | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 10. A Olsson vs de Firmian |
| 1-0 | 44 | 2002 | Stockholm International | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 11. M Nielsen vs de Firmian |
| 0-1 | 40 | 2004 | Politiken Cup | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
Kibitzing
