| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. H Westerinen vs Uhlmann |
| 0-1 | 43 |
1963 |
Halle GER | C19 French, Winawer, Advance |
| 2. H Westerinen vs Taimanov |
| 0-1 | 44 |
1967 |
Leningrad | C16 French, Winawer |
| 3. H Westerinen vs Korchnoi |
 | 0-1 | 28 |
1968 |
Palma de Mallorca 6/291 | C16 French, Winawer |
| 4. H Westerinen vs Portisch |
| 1-0 | 54 |
1969 |
Leningrad | C07 French, Tarrasch |
| 5. H Westerinen vs Geller |
| ½-½ | 70 |
1971 |
Netanya | C16 French, Winawer |
| 6. H Westerinen vs Ulf Andersson |
| ½-½ | 61 |
1971 |
FRG-ch int | C07 French, Tarrasch |
| 7. H Westerinen vs O Sarapu |
 | ½-½ | 22 |
1972 |
20th Olympiad - Skopje | C11 French |
| 8. H Westerinen vs Huebner |
| 0-1 | 50 |
1974 |
Oslo | C05 French, Tarrasch |
| 9. H Westerinen vs Kholmov |
| 0-1 | 43 |
1976 |
Budapest Tungsram | C08 French, Tarrasch, Open, 4.ed ed |
| 10. H Westerinen vs J Donaldson |
| ½-½ | 58 |
1978 |
Lone Pine | C05 French, Tarrasch |
| 11. H Westerinen vs B Brinck-Claussen |
| ½-½ | 60 |
1978 |
Esbjerg | C00 French Defense |
| 12. H Westerinen vs J Branford |
| 1-0 | 50 |
1978 |
Lloyds Bank | C19 French, Winawer, Advance |
| 13. H Westerinen vs Skembris |
| ½-½ | 40 |
1989 |
EU-chT (Men) | C15 French, Winawer |
| 14. H Westerinen vs I Nei |
| ½-½ | 26 |
1989 |
EST-FIN m | C15 French, Winawer |
| 15. H Westerinen vs Uhlmann |
| ½-½ | 53 |
1990 |
Porz | C15 French, Winawer |
| 16. H Westerinen vs I Jelen |
| 1-0 | 29 |
1992 |
EU-chT (Men) | C02 French, Advance |
| 17. H Westerinen vs Dreev |
| 0-1 | 81 |
1992 |
It (open) | C02 French, Advance |
| 18. H Westerinen vs Barsov |
| 0-1 | 56 |
1999 |
VAM Hoogeveen op | C01 French, Exchange |
| 19. H Westerinen vs Gudjon Heidar Valgardsson |
| 1-0 | 28 |
2000 |
Reykjavik op19 | C15 French, Winawer |
| 20. H Westerinen vs J Halldorsson |
| 1-0 | 38 |
2000 |
Reykjavik op19 | C17 French, Winawer, Advance |
| 21. H Westerinen vs E Hedman |
| ½-½ | 45 |
2001 |
Classics IMB | C11 French |
| 22. H Westerinen vs Leer-Salvesen |
| ½-½ | 31 |
2001 |
Classics IMB | C02 French, Advance |
| 23. H Westerinen vs E Llobel Cortell |
| ½-½ | 16 |
2004 |
20th European Club Cup | C19 French, Winawer, Advance |
| 24. H Westerinen vs Korchnoi |
| 1-0 | 67 |
2006 |
EU-chT Seniors | C14 French, Classical |
| 25. H Westerinen vs E Porper |
| ½-½ | 44 |
2007 |
Arctic Chess Challenge | C00 French Defense |