Game |
| Result | Moves |
Year | Event/Locale | Opening |
1. Benjamin vs de Firmian |
| ½-½ | 44 | 1987 | United States Championship | E32 Nimzo-Indian, Classical |
2. Hort vs de Firmian |
| ½-½ | 49 | 1989 | Biel | E32 Nimzo-Indian, Classical |
3. Gulko vs de Firmian |
| 1-0 | 31 | 1989 | United States Championship | E32 Nimzo-Indian, Classical |
4. E Klein vs de Firmian |
| 0-1 | 31 | 1993 | New York Open | E32 Nimzo-Indian, Classical |
5. N Jenson vs de Firmian |
| 0-1 | 23 | 1993 | National Open | E32 Nimzo-Indian, Classical |
6. T Dao vs de Firmian |
| 0-1 | 41 | 1993 | Tilburg Interpolis | E32 Nimzo-Indian, Classical |
7. M Hoffmann vs de Firmian |
| ½-½ | 22 | 1994 | Biel MTO op | E32 Nimzo-Indian, Classical |
8. B Finegold vs de Firmian |
 | 1-0 | 36 | 1994 | Chicago Int 3rd | E32 Nimzo-Indian, Classical |
9. G Flear vs de Firmian |
 | 0-1 | 64 | 1994 | Lost Boys Open | E32 Nimzo-Indian, Classical |
10. Sadler vs de Firmian |
| ½-½ | 39 | 1995 | Buenos Aires Najdorf | E32 Nimzo-Indian, Classical |
11. Adianto vs de Firmian |
| 0-1 | 37 | 1995 | Biel | E32 Nimzo-Indian, Classical |
12. I Sokolov vs de Firmian |
| ½-½ | 23 | 1996 | CITS New York | E32 Nimzo-Indian, Classical |
13. L Schandorff vs de Firmian |
| ½-½ | 63 | 1996 | Politiken Cup | E32 Nimzo-Indian, Classical |
14. L Kaufman vs de Firmian |
| 0-1 | 40 | 1997 | US Masters | E32 Nimzo-Indian, Classical |
15. R Vera vs de Firmian |
| ½-½ | 38 | 1997 | World Team Championship | E32 Nimzo-Indian, Classical |
16. I Sokolov vs de Firmian |
 | 0-1 | 40 | 1998 | Reykjavik Open | E32 Nimzo-Indian, Classical |
17. R H Fyllingen vs de Firmian |
| 0-1 | 37 | 1999 | Troll Masters | E32 Nimzo-Indian, Classical |
18. Gelfand vs de Firmian |
| ½-½ | 24 | 1999 | Sigeman & Co | E32 Nimzo-Indian, Classical |
19. F Alvarado Ascanio vs de Firmian |
| 0-1 | 56 | 1999 | Las Palmas Open | E32 Nimzo-Indian, Classical |
20. M Lonborg vs de Firmian |
| 0-1 | 29 | 2000 | Politiken Cup | E32 Nimzo-Indian, Classical |
21. A Baburin vs de Firmian |
| ½-½ | 30 | 2000 | Politiken Cup | E32 Nimzo-Indian, Classical |
22. K Hovmoller vs de Firmian |
| 0-1 | 56 | 2001 | Politiken Cup | E32 Nimzo-Indian, Classical |
23. A Baburin vs de Firmian |
| ½-½ | 19 | 2002 | Imre Konig Memorial | E32 Nimzo-Indian, Classical |
24. T Hillarp Persson vs de Firmian |
| ½-½ | 43 | 2004 | Sigeman & Co | E32 Nimzo-Indian, Classical |
25. Goldin vs de Firmian |
| 1-0 | 40 | 2006 | United States Championship | E32 Nimzo-Indian, Classical |