Game |
| Result | Moves |
Year | Event/Locale | Opening |
1. O Kaila vs H Koskinen |
| 1-0 | 33 | 1953 | FIN ch | B13 Caro-Kann, Exchange |
2. H Koskinen vs I Solin |
| ½-½ | 32 | 1954 | Prague / Marianske Lazne Zonal | B30 Sicilian |
3. Szabo vs H Koskinen |
| 1-0 | 30 | 1954 | Prague / Marianske Lazne Zonal | D98 Grunfeld, Russian |
4. H Koskinen vs F Olafsson |
| 0-1 | 27 | 1954 | Prague / Marianske Lazne Zonal | C89 Ruy Lopez, Marshall |
5. Uhlmann vs H Koskinen |
| 1-0 | 43 | 1954 | Prague / Marianske Lazne Zonal | E14 Queen's Indian |
6. N Minev vs H Koskinen |
| 1-0 | 59 | 1954 | Prague / Marianske Lazne Zonal | D70 Neo-Grunfeld Defense |
7. Sliwa vs H Koskinen |
| 1-0 | 38 | 1954 | Prague / Marianske Lazne Zonal | D86 Grunfeld, Exchange |
8. H Koskinen vs J Sajtar |
| ½-½ | 10 | 1954 | Prague / Marianske Lazne Zonal | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
9. H Koskinen vs V Ciocaltea |
| ½-½ | 49 | 1954 | Prague / Marianske Lazne Zonal | A89 Dutch, Leningrad, Main Variation with Nc6 |
10. G Kluger vs H Koskinen |
| ½-½ | 68 | 1954 | Prague / Marianske Lazne Zonal | E90 King's Indian |
11. H Koskinen vs G Palmason |
| ½-½ | 28 | 1954 | Prague / Marianske Lazne Zonal | A07 King's Indian Attack |
12. H Koskinen vs I Balanel |
| ½-½ | 41 | 1954 | Prague / Marianske Lazne Zonal | C91 Ruy Lopez, Closed |
13. Pachman vs H Koskinen |
| 1-0 | 37 | 1954 | Prague / Marianske Lazne Zonal | E14 Queen's Indian |
14. E Lundin vs H Koskinen |
| 1-0 | 35 | 1954 | Prague / Marianske Lazne Zonal | D74 Neo-Grunfeld, 6.cd Nxd5, 7.O-O |
15. H Koskinen vs S Basjuni |
| ½-½ | 40 | 1954 | Prague / Marianske Lazne Zonal | D13 Queen's Gambit Declined Slav, Exchange Variation |
16. H Koskinen vs Barcza |
| 0-1 | 41 | 1954 | Prague / Marianske Lazne Zonal | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
17. E Pedersen vs H Koskinen |
| ½-½ | 24 | 1954 | Prague / Marianske Lazne Zonal | E26 Nimzo-Indian, Samisch |
18. Stahlberg vs H Koskinen |
| 1-0 | 31 | 1954 | Prague / Marianske Lazne Zonal | D74 Neo-Grunfeld, 6.cd Nxd5, 7.O-O |
19. H Koskinen vs B Hoxha |
| 1-0 | 40 | 1954 | Prague / Marianske Lazne Zonal | A33 English, Symmetrical |
20. H Koskinen vs Filip |
| ½-½ | 44 | 1954 | Prague / Marianske Lazne Zonal | B28 Sicilian, O'Kelly Variation |
21. H Koskinen vs F Thorbergsson |
| ½-½ | 49 | 1958 | Munich Olympiad qual-2 | C04 French, Tarrasch, Guimard Main line |
22. S Halvorsen vs H Koskinen |
| 0-1 | 79 | 1958 | Munich Olympiad qual-2 | B11 Caro-Kann, Two Knights, 3...Bg4 |
23. H Koskinen vs D Isaacson |
| ½-½ | 39 | 1958 | Munich Olympiad qual-2 | C81 Ruy Lopez, Open, Howell Attack |
24. H Koskinen vs H Catozzi |
| 0-1 | 43 | 1958 | Munich Olympiad Final-B | C91 Ruy Lopez, Closed |
25. R Siemms vs H Koskinen |
 | 0-1 | 43 | 1958 | Munich Olympiad Final-B | A16 English |