| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 26. DeFirmian vs Hort |
| 0-1 | 42 |
1979 |
Lone Pine (USA) | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 27. Pachman vs DeFirmian |
| 0-1 | 55 |
1979 |
Lone Pine (USA) | E14 Queen's Indian |
| 28. DeFirmian vs Benko |
| ½-½ | 25 |
1979 |
Lone Pine (USA) | B42 Sicilian, Kan |
| 29. A J Norris vs DeFirmian |
 | ½-½ | 40 |
1980 |
Olympiad | B93 Sicilian, Najdorf, 6.f4 |
| 30. Kaufman vs DeFirmian |
| ½-½ | 66 |
1980 |
Lone Pine (USA) | E83 King's Indian, Samisch |
| 31. DeFirmian vs V Raicevic |
| ½-½ | 42 |
1980 |
Lone Pine (USA) | C00 French Defense |
| 32. DeFirmian vs P Nikolic |
| 0-1 | 39 |
1980 |
Olympiad | C92 Ruy Lopez, Closed |
| 33. DeFirmian vs B Ivanovic |
| ½-½ | 52 |
1980 |
Lone Pine (USA) | B33 Sicilian |
| 34. J Frankle vs DeFirmian |
| 1-0 | 41 |
1980 |
Telephone | B21 Sicilian, 2.f4 and 2.d4 |
| 35. E Michaelides vs DeFirmian |
| ½-½ | 44 |
1980 |
Lone Pine (USA) | E67 King's Indian, Fianchetto |
| 36. J Whitehead vs DeFirmian |
| 1-0 | 31 |
1980 |
Lone Pine (USA) | B50 Sicilian |
| 37. R Mateo vs DeFirmian |
| 0-1 | 42 |
1980 |
Olympiad | A14 English |
| 38. Reshevsky vs DeFirmian |
| 1-0 | 39 |
1980 |
Lone Pine (USA) | E12 Queen's Indian |
| 39. DeFirmian vs P Youngworth |
| 1-0 | 43 |
1980 |
Lone Pine (USA) | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 40. Navarro vs DeFirmian |
| 0-1 | 32 |
1980 |
Olympiad | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 41. H Westerinen vs DeFirmian |
| ½-½ | 41 |
1980 |
Baerum | B93 Sicilian, Najdorf, 6.f4 |
| 42. Petursson vs DeFirmian |
| 0-1 | 56 |
1980 |
Lone Pine (USA) | E76 King's Indian, Four Pawns Attack |
| 43. DeFirmian vs Gheorghiu |
| 0-1 | 34 |
1980 |
Lone Pine (USA) | B42 Sicilian, Kan |
| 44. DeFirmian vs A Sinadinovic |
| 1-0 | 43 |
1981 |
Nis (Yugoslavia) | A06 Reti Opening |
| 45. DeFirmian vs Alburt |
| 0-1 | 68 |
1981 |
Lone Pine (USA) | B05 Alekhine's Defense, Modern |
| 46. DeFirmian vs J Benjamin |
| ½-½ | 34 |
1981 |
4, Lone Pine op | B16 Caro-Kann, Bronstein-Larsen Variation |
| 47. Unzicker vs DeFirmian |
| 1-0 | 41 |
1981 |
It (cat.9) | B92 Sicilian, Najdorf, Opocensky Variation |
| 48. DeFirmian vs Popov |
| ½-½ | 14 |
1981 |
Smederevska Palanka (Yugoslavia) | B05 Alekhine's Defense, Modern |
| 49. DeFirmian vs Dzindzichashvili |
| ½-½ | 15 |
1981 |
Lone Pine (USA) | B43 Sicilian, Kan, 5.Nc3 |
| 50. Matulovic vs DeFirmian |
| ½-½ | 42 |
1981 |
Nis (Yugoslavia) | B99 Sicilian, Najdorf, 7...Be7 Main line |
