| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. B Thorsteinsson vs G Palmason |
| ½-½ | 58 | 1966 | Reykjavik | B43 Sicilian, Kan, 5.Nc3 |
| 27. B Thorsteinsson vs F Olafsson |
| 0-1 | 32 | 1966 | Reykjavik | B94 Sicilian, Najdorf |
| 28. Vasiukov vs B Thorsteinsson |
| 1-0 | 42 | 1966 | Reykjavik | C90 Ruy Lopez, Closed |
| 29. B Thorsteinsson vs J Kristinsson |
| ½-½ | 34 | 1966 | Reykjavik | C59 Two Knights |
| 30. F Thorbergsson vs B Thorsteinsson |
| ½-½ | 71 | 1966 | Reykjavik | A07 King's Indian Attack |
| 31. J Soler Vert vs B Thorsteinsson |
| 0-1 | 50 | 1968 | Lugano Olympiad qual-7 | E61 King's Indian |
| 32. K Lagha vs B Thorsteinsson |
| ½-½ | 23 | 1968 | Lugano Olympiad qual-7 | D27 Queen's Gambit Accepted, Classical |
| 33. K B McAlpine vs B Thorsteinsson |
| ½-½ | 14 | 1968 | Lugano Olympiad Final-B | D02 Queen's Pawn Game |
| 34. B Thorsteinsson vs S Kagan |
| ½-½ | 56 | 1968 | Lugano Olympiad Final-B | B18 Caro-Kann, Classical |
| 35. B Thorsteinsson vs H Koskinen |
| ½-½ | 12 | 1968 | Lugano Olympiad Final-B | B16 Caro-Kann, Bronstein-Larsen Variation |
| 36. B Thorsteinsson vs H Niedermayr |
| 0-1 | 69 | 1968 | Lugano Olympiad Final-B | B42 Sicilian, Kan |
| 37. B Thorsteinsson vs H Glauser |
| 0-1 | 25 | 1968 | Lugano Olympiad Final-B | D86 Grunfeld, Exchange |
| 38. L Prins vs B Thorsteinsson |
| 1-0 | 22 | 1968 | Lugano Olympiad Final-B | C27 Vienna Game |
| 39. B Thorsteinsson vs A Olsson |
| ½-½ | 20 | 1968 | Lugano Olympiad Final-B | C68 Ruy Lopez, Exchange |
| 40. B Thorsteinsson vs G Sigurjonsson |
| ½-½ | 45 | 1970 | Reykjavik | B06 Robatsch |
| 41. J Kristinsson vs B Thorsteinsson |
| 0-1 | 49 | 1970 | Reykjavik | E02 Catalan, Open, 5.Qa4 |
| 42. B Thorsteinsson vs B Amos |
| 0-1 | 35 | 1970 | Reykjavik | B82 Sicilian, Scheveningen |
| 43. F Olafsson vs B Thorsteinsson |
| ½-½ | 35 | 1970 | Reykjavik | A27 English, Three Knights System |
| 44. B Thorsteinsson vs B Sigurjonsson |
| 1-0 | 18 | 1970 | Reykjavik | B90 Sicilian, Najdorf |
| 45. Matulovic vs B Thorsteinsson |
| 1-0 | 44 | 1970 | Reykjavik | C84 Ruy Lopez, Closed |
| 46. B Thorsteinsson vs J Torfason |
| ½-½ | 42 | 1970 | Reykjavik | B18 Caro-Kann, Classical |
| 47. H Hecht vs B Thorsteinsson |
| ½-½ | 55 | 1970 | Reykjavik | C85 Ruy Lopez, Exchange Variation Doubly Deferred (DERLD) |
| 48. B Thorsteinsson vs B Kristjansson |
| 1-0 | 75 | 1970 | Reykjavik | B23 Sicilian, Closed |
| 49. N Padevsky vs B Thorsteinsson |
| 1-0 | 71 | 1970 | Reykjavik | C69 Ruy Lopez, Exchange, Gligoric Variation |
| 50. B Thorsteinsson vs O Kristjansson |
| 1-0 | 72 | 1970 | Reykjavik | B18 Caro-Kann, Classical |
Kibitzing
