| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. R Weemaes vs A Ornstein |
| 0-1 | 46 | 1972 | EU-ch U20 fin-C | C94 Ruy Lopez, Closed, Breyer Defense |
| 27. A Ornstein vs T Stefansson |
 | 1-0 | 25 | 1972 | EU-ch U20 fin-C | E66 King's Indian, Fianchetto, Yugoslav Panno |
| 28. A Ornstein vs P Omtvedt |
| 1-0 | 44 | 1972 | EU-ch U20 fin-C | D37 Queen's Gambit Declined |
| 29. D Uddenfeldt vs A Ornstein |
| ½-½ | 61 | 1972 | SWE-ch | E80 King's Indian, Samisch Variation |
| 30. J Eslon vs A Ornstein |
| 0-1 | 38 | 1972 | SWE-ch | B43 Sicilian, Kan, 5.Nc3 |
| 31. A Ornstein vs F Cassar |
| 1-0 | 30 | 1972 | EU-ch U20 fin-C | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 32. H Akvist vs A Ornstein |
| ½-½ | 41 | 1972 | SWE-ch | C91 Ruy Lopez, Closed |
| 33. V Miranda vs A Ornstein |
| 0-1 | 37 | 1972 | EU-ch U20 fin-C | A10 English |
| 34. A Fridh vs A Ornstein |
| 0-1 | 37 | 1972 | SWE-ch | D74 Neo-Grunfeld, 6.cd Nxd5, 7.O-O |
| 35. S Cvetkovic vs A Ornstein |
| 1-0 | 47 | 1972 | WchT U26 19th fin-B | E42 Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein) |
| 36. A Ornstein vs A Ipek |
| 1-0 | 27 | 1972 | EU-ch U20 fin-C | A15 English |
| 37. A Ornstein vs G Brostrom |
| 1-0 | 54 | 1972 | SWE-ch | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 38. A Hellmayr vs A Ornstein |
| 0-1 | 40 | 1972 | EU-ch U20 fin-C | B21 Sicilian, 2.f4 and 2.d4 |
| 39. D Hansson vs A Ornstein |
| 0-1 | 40 | 1972 | SWE-ch | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 40. S Gross vs A Ornstein |
| 0-1 | 48 | 1972 | WchT U26 19th prel-E | A33 English, Symmetrical |
| 41. G Tsouros vs A Ornstein |
| 0-1 | 29 | 1972 | WchT U26 19th prel-E | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 42. A Ornstein vs I Farago |
| ½-½ | 40 | 1972 | WchT U26 19th prel-E | C09 French, Tarrasch, Open Variation, Main line |
| 43. A Ornstein vs S Mariotti |
| 0-1 | 38 | 1972 | Skopje Olympiad qual-6 | A07 King's Indian Attack |
| 44. Knaak vs A Ornstein |
| ½-½ | 30 | 1972 | Skopje Olympiad qual-6 | E39 Nimzo-Indian, Classical, Pirc Variation |
| 45. S J Hutchings vs A Ornstein |
| 0-1 | 60 | 1972 | Skopje Olympiad qual-6 | A05 Reti Opening |
| 46. A Ornstein vs W Attard |
| 1-0 | 38 | 1972 | Skopje Olympiad qual-6 | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 47. A Ornstein vs R Toran |
| ½-½ | 26 | 1972 | Skopje Olympiad Final-A | B80 Sicilian, Scheveningen |
| 48. J Emma vs A Ornstein |
| 1-0 | 39 | 1972 | Skopje Olympiad Final-A | C21 Center Game |
| 49. A Ornstein vs Forintos |
| ½-½ | 45 | 1972 | Skopje Olympiad Final-A | B27 Sicilian |
| 50. A Ornstein vs K Darga |
| 1-0 | 49 | 1972 | Skopje Olympiad Final-A | B43 Sicilian, Kan, 5.Nc3 |
Kibitzing
