| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. S Bjarnason vs DeFirmian |
| 0-1 | 56 |
1973 |
Bunadarbanka (Iceland) | A37 English, Symmetrical |
| 2. DeFirmian vs Seirawan |
 | 1-0 | 44 |
1976 |
USA-ch U18 | B01 Scandinavian |
| 3. D J Strauss vs DeFirmian |
| 0-1 | 18 |
1976 |
Lone Pine | B26 Sicilian, Closed, 6.Be3 |
| 4. Bisguier vs DeFirmian |
| 0-1 | 49 |
1976 |
CAN-op | B21 Sicilian, 2.f4 and 2.d4 |
| 5. R Blumenfeld vs DeFirmian |
| 0-1 | 41 |
1976 |
Lone Pine | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 6. K Spraggett vs DeFirmian |
| 0-1 | 37 |
1976 |
Can. Open, Toronto | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 7. DeFirmian vs Martinovsky |
| 1-0 | 51 |
1976 |
Lone Pine | C62 Ruy Lopez, Old Steinitz Defense |
| 8. DeFirmian vs N J Patterson |
| 1-0 | 23 |
1978 |
London (England) | B97 Sicilian, Najdorf |
| 9. DeFirmian vs Christiansen |
| 1-0 | 46 |
1979 |
Lone Pine | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 10. Pachman vs DeFirmian |
| 0-1 | 55 |
1979 |
Lone Pine | E14 Queen's Indian |
| 11. DeFirmian vs V Zaltsman |
| 1-0 | 45 |
1979 |
Lone Pine | B89 Sicilian |
| 12. Navarro vs DeFirmian |
| 0-1 | 32 |
1980 |
Olympiad | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 13. Petursson vs DeFirmian |
| 0-1 | 56 |
1980 |
Lone Pine | E76 King's Indian, Four Pawns Attack |
| 14. DeFirmian vs P Youngworth |
| 1-0 | 43 |
1980 |
Lone Pine | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 15. R Mateo vs DeFirmian |
| 0-1 | 42 |
1980 |
Olympiad | A14 English |
| 16. J Thinnsen vs DeFirmian |
| 0-1 | 38 |
1981 |
Lone Pine | A30 English, Symmetrical |
| 17. Ivkov vs DeFirmian |
| 0-1 | 41 |
1981 |
Smederevska Palanka (Yugoslavia) | A13 English |
| 18. DeFirmian vs Hort |
| 1-0 | 33 |
1981 |
It (cat.9) | B87 Sicilian, Fischer-Sozin with ...a6 and ...b5 |
| 19. DeFirmian vs M Tosic |
| 1-0 | 43 |
1981 |
Nis (Yugoslavia) | A04 Reti Opening |
| 20. P Youngworth vs DeFirmian |
| 0-1 | 37 |
1981 |
Lone Pine | A62 Benoni, Fianchetto Variation |
| 21. DeFirmian vs V Ciocaltea |
| 1-0 | 30 |
1981 |
Smederevska Palanka (Yugoslavia) | A01 Nimzovich-Larsen Attack |
| 22. DeFirmian vs H Kestler |
| 1-0 | 27 |
1981 |
It (cat.9) | B07 Pirc |
| 23. DeFirmian vs A Sinadinovic |
| 1-0 | 43 |
1981 |
Nis (Yugoslavia) | A06 Reti Opening |
| 24. DeFirmian vs D Roos |
| 1-0 | 41 |
1981 |
Baden-Baden (Germany) | A14 English |
| 25. DeFirmian vs I Zhivanov |
| 1-0 | 40 |
1981 |
Smederevska Palanka (Yugoslavia) | A30 English, Symmetrical |
