| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 26. A Ornstein vs W Schmidt |
| 1-0 | 31 |
1975 |
EU-chT sf | B05 Alekhine's Defense, Modern |
| 27. A Ornstein vs Uhlmann |
| 0-1 | 37 |
1975 |
Polanica Zdroj 01 | E92 King's Indian |
| 28. A Ornstein vs W Schmidt |
| 1-0 | 43 |
1975 |
Rubinstein mem | E90 King's Indian |
| 29. E Paoli vs A Ornstein |
| 0-1 | 49 |
1975 |
Eksjo 3th | B84 Sicilian, Scheveningen |
| 30. Ljubojevic vs A Ornstein |
| 1-0 | 47 |
1975 |
Stockholm | B68 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 9...Be7 |
| 31. Plachetka vs A Ornstein |
| ½-½ | 45 |
1975 |
Rubinstein mem | A31 English, Symmetrical, Benoni Formation |
| 32. W Schmidt vs A Ornstein |
| 1-0 | 55 |
1975 |
EU-chT sf | A30 English, Symmetrical |
| 33. A Ornstein vs Gulko |
| 1-0 | 55 |
1976 |
Yerevan | A14 English |
| 34. I Bilek vs A Ornstein |
 | 1-0 | 57 |
1976 |
Albena (Bulgaria) | A00 Uncommon Opening |
| 35. A Ornstein vs Smejkal |
| ½-½ | 41 |
1976 |
Yerevan | C96 Ruy Lopez, Closed |
| 36. Sosonko vs A Ornstein |
| 1-0 | 30 |
1976 |
Haifa olm | A62 Benoni, Fianchetto Variation |
| 37. W Schmidt vs A Ornstein |
| ½-½ | 41 |
1976 |
Decin-A | A30 English, Symmetrical |
| 38. A Ornstein vs Plachetka |
| 0-1 | 31 |
1976 |
Decin-A | B83 Sicilian |
| 39. Minev vs A Ornstein |
| ½-½ | 49 |
1976 |
Decin-A | A15 English |
| 40. A Ornstein vs C Silva Sanchez |
| ½-½ | 33 |
1976 |
Haifa ol (Men) | D60 Queen's Gambit Declined, Orthodox Defense |
| 41. Sosonko vs A Ornstein |
| 1-0 | 30 |
1976 |
Haifa | A62 Benoni, Fianchetto Variation |
| 42. A Ornstein vs Jansa |
| 0-1 | 32 |
1976 |
Decin | E67 King's Indian, Fianchetto |
| 43. V Tukmakov vs A Ornstein |
| 1-0 | 16 |
1976 |
Yerevan | E91 King's Indian |
| 44. W Schmidt vs A Ornstein |
| 1-0 | 23 |
1976 |
Yerevan | A30 English, Symmetrical |
| 45. A Ornstein vs Savon |
| 0-1 | 40 |
1976 |
Yerevan | E92 King's Indian |
| 46. Lutikov vs A Ornstein |
| 1-0 | 54 |
1976 |
Albena | C84 Ruy Lopez, Closed |
| 47. Romanishin vs A Ornstein |
| 1-0 | 32 |
1976 |
Yerevan | E20 Nimzo-Indian |
| 48. H Pohla vs A Ornstein |
| 0-1 | 53 |
1977 |
Tallinn | C02 French, Advance |
| 49. Gulko vs A Ornstein |
| 1-0 | 29 |
1977 |
Tallinn | A10 English |
| 50. A Ornstein vs W Schmidt |
| 1-0 | 39 |
1977 |
Budapest Tungsram | E61 King's Indian |