| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 51. H Koskinen vs H Camara |
| ½-½ | 53 | 1968 | Lugano Olympiad Final-B | B27 Sicilian |
| 52. H Bouwmeester vs H Koskinen |
| 1-0 | 34 | 1968 | Lugano Olympiad Final-B | A07 King's Indian Attack |
| 53. Myagmarsuren vs H Koskinen |
| ½-½ | 30 | 1968 | Lugano Olympiad Final-B | A45 Queen's Pawn Game |
| 54. R Hartoch vs H Koskinen |
| ½-½ | 28 | 1970 | Siegen Olympiad qual-3 | A16 English |
| 55. H Koskinen vs K Arita |
| 1-0 | 48 | 1970 | Siegen Olympiad qual-3 | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 56. V Rizo vs H Koskinen |
| 0-1 | 33 | 1970 | Siegen Olympiad qual-3 | E62 King's Indian, Fianchetto |
| 57. E Mednis vs H Koskinen |
| ½-½ | 18 | 1970 | Siegen Olympiad qual-3 | B16 Caro-Kann, Bronstein-Larsen Variation |
| 58. A Scherman vs H Koskinen |
| 0-1 | 34 | 1970 | Siegen Olympiad qual-3 | B17 Caro-Kann, Steinitz Variation |
| 59. H Koskinen vs O Jakobsen |
| 0-1 | 28 | 1970 | Siegen Olympiad Final-B | C78 Ruy Lopez |
| 60. A Filipowicz vs H Koskinen |
| 0-1 | 52 | 1970 | Siegen Olympiad Final-B | B13 Caro-Kann, Exchange |
| 61. C Cuartas vs H Koskinen |
| ½-½ | 50 | 1970 | Siegen Olympiad Final-B | B13 Caro-Kann, Exchange |
| 62. H Koskinen vs A Bachtiar |
| ½-½ | 17 | 1970 | Siegen Olympiad Final-B | B28 Sicilian, O'Kelly Variation |
| 63. H Koskinen vs K Roehrl |
| ½-½ | 17 | 1970 | Siegen Olympiad Final-B | B80 Sicilian, Scheveningen |
| 64. H Koskinen vs C Purdy |
| 1-0 | 41 | 1970 | Siegen Olympiad Final-B | C78 Ruy Lopez |
| 65. G Lebredo Zaragoitia vs H Koskinen |
| 1-0 | 27 | 1970 | Siegen Olympiad Final-B | D72 Neo-Grunfeld, 5.cd, Main line |
| 66. H Koskinen vs E Book |
| 0-1 | 56 | 1978 | Helsinki ch | C67 Ruy Lopez |
Kibitzing
