| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Z Harari vs DeFirmian |
| 1-0 | 28 |
1977 |
USA | A76 Benoni, Classical, 9...Re8 |
| 2. W Schmidt vs DeFirmian |
| ½-½ | 60 |
1981 |
Smederevska Palanka (Yugoslavia) | A75 Benoni, Classical with ...a6 and 10...Bg4 |
| 3. P Youngworth vs DeFirmian |
 | 0-1 | 37 |
1981 |
Lone Pine (USA) | A62 Benoni, Fianchetto Variation |
| 4. G Andruet vs DeFirmian |
| ½-½ | 34 |
1982 |
Gausdal Young Men | A75 Benoni, Classical with ...a6 and 10...Bg4 |
| 5. J Levitt vs DeFirmian |
| ½-½ | 46 |
1982 |
London (England) | A71 Benoni, Classical, 8.Bg5 |
| 6. D Rajkovic vs DeFirmian |
 | 0-1 | 33 |
1983 |
It (cat.10) | A75 Benoni, Classical with ...a6 and 10...Bg4 |
| 7. J Benjamin vs DeFirmian |
| 1-0 | 40 |
1983 |
01, Greenville | A77 Benoni, Classical, 9...Re8, 10.Nd2 |
| 8. Paunovic vs DeFirmian |
| 1-0 | 41 |
1983 |
Vrnjachka Banja (Yugoslavia) | A61 Benoni |
| 9. J Whitehead vs DeFirmian |
| 0-1 | 52 |
1983 |
Ch USA | A61 Benoni |
| 10. Dlugy vs DeFirmian |
| 0-1 | 67 |
1984 |
Ch USA | A61 Benoni |
| 11. J Bonin vs DeFirmian |
| 0-1 | 42 |
1984 |
It New York (USA) | A61 Benoni |
| 12. Tarjan vs DeFirmian |
| ½-½ | 26 |
1984 |
Ch USA | A65 Benoni, 6.e4 |
| 13. Pinter vs DeFirmian |
| ½-½ | 21 |
1984 |
Olympiad | A61 Benoni |
| 14. N Birnboim vs DeFirmian |
| 0-1 | 31 |
1984 |
Olympiad | A62 Benoni, Fianchetto Variation |
| 15. Sahovic vs DeFirmian |
| ½-½ | 57 |
1984 |
Bor (Yugoslavia) | A70 Benoni, Classical with 7.Nf3 |
| 16. I Rogers vs DeFirmian |
| ½-½ | 70 |
1984 |
It (cat.8) | A61 Benoni |
| 17. Portisch vs DeFirmian |
| ½-½ | 48 |
1985 |
Izt | A61 Benoni |
| 18. Alburt vs DeFirmian |
| 1-0 | 20 |
1985 |
USA | A63 Benoni, Fianchetto, 9...Nbd7 |
| 19. Sosonko vs DeFirmian |
| ½-½ | 25 |
1985 |
Izt | A63 Benoni, Fianchetto, 9...Nbd7 |
| 20. Alburt vs DeFirmian |
| 1-0 | 34 |
1985 |
Ch USA | A63 Benoni, Fianchetto, 9...Nbd7 |
| 21. B Toth vs DeFirmian |
| 0-1 | 37 |
1986 |
Biel (Switzerland) | A56 Benoni Defense |
| 22. M Wilder vs DeFirmian |
| 1-0 | 40 |
1986 |
Ch USA | A61 Benoni |
| 23. P Nikolic vs DeFirmian |
| 1-0 | 40 |
1986 |
It (cat.12) | A63 Benoni, Fianchetto, 9...Nbd7 |
| 24. Seirawan vs DeFirmian |
| ½-½ | 63 |
1987 |
New York (USA) | A56 Benoni Defense |
| 25. Dlugy vs DeFirmian |
| 1-0 | 72 |
1988 |
It (open) | A56 Benoni Defense |