| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. H Westerinen vs P Trifunovic |
| ½-½ | 31 |
1963 |
Halle | C81 Ruy Lopez, Open, Howell Attack |
| 2. H Westerinen vs P Ofstad |
| ½-½ | 41 |
1963 |
Halle | C80 Ruy Lopez, Open |
| 3. H Westerinen vs C Zuidema |
| ½-½ | 66 |
1966 |
Orebro Stud olm fA | C97 Ruy Lopez, Closed, Chigorin |
| 4. H Westerinen vs J Boey |
| ½-½ | 55 |
1966 |
Havana ol (Men) fin-B | C63 Ruy Lopez, Schliemann Defense |
| 5. H Westerinen vs Tringov |
| ½-½ | 46 |
1967 |
October Revolution 50 | C94 Ruy Lopez, Closed, Breyer Defense |
| 6. H Westerinen vs Kholmov |
| ½-½ | 42 |
1967 |
October Revolution 50 | C78 Ruy Lopez |
| 7. H Westerinen vs Minev |
| 1-0 | 44 |
1967 |
Halle zt | C67 Ruy Lopez |
| 8. H Westerinen vs Ujtumen |
| 0-1 | 42 |
1968 |
Lugano olm fB | C82 Ruy Lopez, Open |
| 9. H Westerinen vs Keres |
| ½-½ | 60 |
1968 |
Helsinki FIN-EST (19.05.68) | C96 Ruy Lopez, Closed |
| 10. H Westerinen vs Portisch |
| 0-1 | 50 |
1969 |
Raach | C94 Ruy Lopez, Closed, Breyer Defense |
| 11. H Westerinen vs Timman |
| 1-0 | 25 |
1969 |
Vilnius | C90 Ruy Lopez, Closed |
| 12. H Westerinen vs G Timoshchenko |
| 1-0 | 65 |
1969 |
Vilnius | C77 Ruy Lopez |
| 13. H Westerinen vs Keres |
 | ½-½ | 82 |
1969 |
Tallinn EST-FIN (03.05.69) | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 14. H Westerinen vs Smejkal |
 | 0-1 | 36 |
1969 |
Raach zt | C86 Ruy Lopez, Worrall Attack |
| 15. H Westerinen vs A Planinc |
 | 0-1 | 40 |
1970 |
Parcetic mem 4th | C60 Ruy Lopez |
| 16. H Westerinen vs Ivkov |
| 0-1 | 36 |
1970 |
Wijk aan Zee | C84 Ruy Lopez, Closed |
| 17. H Westerinen vs Larsen |
| ½-½ | 50 |
1970 |
Siegen ol (Men) fin-B | C60 Ruy Lopez |
| 18. H Westerinen vs Cortlever |
| ½-½ | 18 |
1970 |
Wijk aan Zee I | C63 Ruy Lopez, Schliemann Defense |
| 19. H Westerinen vs Bobotsov |
| 1-0 | 48 |
1970 |
Hoogovens | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 20. H Westerinen vs Kurajica |
| 0-1 | 38 |
1970 |
Wijk aan Zee I | C60 Ruy Lopez |
| 21. H Westerinen vs Unzicker |
| ½-½ | 29 |
1971 |
FRG-ch int | C81 Ruy Lopez, Open, Howell Attack |
| 22. H Westerinen vs Myagmarsuren |
| ½-½ | 52 |
1971 |
Tallinn it | C70 Ruy Lopez |
| 23. H Westerinen vs Teschner |
| ½-½ | 58 |
1971 |
FRG-ch int | C84 Ruy Lopez, Closed |
| 24. H Westerinen vs Smejkal |
| 0-1 | 41 |
1971 |
Tallinn | C94 Ruy Lopez, Closed, Breyer Defense |
| 25. H Westerinen vs Gligoric |
 | 0-1 | 58 |
1971 |
FRG-ch int | C93 Ruy Lopez, Closed, Smyslov Defense |