| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. H Koskinen vs M Ebeling |
| 1-0 | 26 | 1987 | Finnish Championship | A52 Budapest Gambit |
| 2. A Hentunen vs H Koskinen |
| 1-0 | 41 | 1987 | Finnish Championship | A15 English |
| 3. P Lehtivaara vs H Koskinen |
| ½-½ | 84 | 1987 | Finnish Championship | C09 French, Tarrasch, Open Variation, Main line |
| 4. H Koskinen vs M Kivisto |
| 0-1 | 60 | 1987 | Finnish Championship | A90 Dutch |
| 5. Y Rantanen vs H Koskinen |
| 1-0 | 48 | 1987 | FIN-chT | C43 Petrov, Modern Attack |
| 6. H Koskinen vs H Laasanen |
| ½-½ | 33 | 1987 | Finnish Championship | E21 Nimzo-Indian, Three Knights |
| 7. H Koskinen vs T Pirttimaki |
| 0-1 | 61 | 1987 | Finnish Championship | A43 Old Benoni |
| 8. H Koskinen vs T Ristoja |
| ½-½ | 23 | 1987 | Finnish Championship | D03 Torre Attack (Tartakower Variation) |
| 9. J Partanen vs H Koskinen |
| ½-½ | 55 | 1987 | Finnish Championship | A90 Dutch |
| 10. Y Rantanen vs H Koskinen |
| 1-0 | 62 | 1987 | Finnish Championship | C42 Petrov Defense |
| 11. R Nokka vs H Koskinen |
| ½-½ | 34 | 1987 | Finnish Championship | A00 Uncommon Opening |
| 12. H Koskinen vs J Haapasalo |
| ½-½ | 17 | 1987 | Finnish Championship | E10 Queen's Pawn Game |
| 13. H Koskinen vs A Pyhala |
| 1-0 | 60 | 1987 | Finnish Championship | D41 Queen's Gambit Declined, Semi-Tarrasch |
| 14. A Loisa vs H Koskinen |
| ½-½ | 34 | 1987 | Finnish Championship | A04 Reti Opening |
| 15. H Koskinen vs Y Rantanen |
| ½-½ | 14 | 1988 | FIN-chT | D27 Queen's Gambit Accepted, Classical |
| 16. Y Rantanen vs H Koskinen |
| 0-1 | 29 | 1988 | Turku op | C18 French, Winawer |
| 17. J Norri vs H Koskinen |
| ½-½ | 52 | 1989 | Finnish Championship | D86 Grunfeld, Exchange |
| 18. H Koskinen vs E Raaste |
| 0-1 | 40 | 1989 | Finnish Championship | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 19. H Koskinen vs Y Rantanen |
| 0-1 | 55 | 1989 | Finnish Championship | D27 Queen's Gambit Accepted, Classical |
| 20. T Pirttimaki vs H Koskinen |
| ½-½ | 10 | 1989 | Finnish Championship | A34 English, Symmetrical |
| 21. H Koskinen vs K Tikkanen |
| ½-½ | 22 | 1989 | Finnish Championship | E32 Nimzo-Indian, Classical |
| 22. H Koskinen vs R Nokka |
| ½-½ | 13 | 1989 | Finnish Championship | D14 Queen's Gambit Declined Slav, Exchange Variation |
| 23. H Koskinen vs J Partanen |
| 0-1 | 37 | 1989 | Finnish Championship | A94 Dutch, Stonewall with Ba3 |
| 24. A Pyhala vs H Koskinen |
| ½-½ | 61 | 1989 | Finnish Championship | A02 Bird's Opening |
| 25. H Koskinen vs A Nokso-Koivisto |
| 0-1 | 29 | 1989 | Finnish Championship | A14 English |
Kibitzing
