| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. Westerinen vs O Puhakka |
 | 1-0 | 36 | 1958 | first category tournament | C15 French, Winawer |
| 2. Westerinen vs Mauri Metsala |
| 1-0 | 28 | 1960 | match for Master title | B09 Pirc, Austrian Attack |
| 3. A Hollis vs Westerinen |
| ½-½ | 48 | 1961 | WchT U26 08th | E62 King's Indian, Fianchetto |
| 4. Westerinen vs Lombardy |
| 0-1 | 35 | 1961 | WchT U26 08th | B94 Sicilian, Najdorf |
| 5. J Westman vs Westerinen |
| 0-1 | 38 | 1961 | WchT U26 08th | C13 French |
| 6. Westerinen vs Parma |
| ½-½ | 50 | 1961 | World Junior Championship qual-3 | B32 Sicilian |
| 7. G Larusson vs Westerinen |
| 1-0 | 23 | 1961 | World Junior Championship qual-3 | A07 King's Indian Attack |
| 8. J Minaya vs Westerinen |
| ½-½ | 30 | 1961 | World Junior Championship qual-3 | D02 Queen's Pawn Game |
| 9. Gheorghiu vs Westerinen |
| 1-0 | 39 | 1961 | World Junior Championship | D32 Queen's Gambit Declined, Tarrasch |
| 10. G Larusson vs Westerinen |
| 0-1 | 34 | 1961 | World Junior Championship | B67 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 8...Bd7 |
| 11. Westerinen vs C Zuidema |
| ½-½ | 92 | 1961 | World Junior Championship | C64 Ruy Lopez, Classical |
| 12. R Calvo Minguez vs Westerinen |
| 1-0 | 57 | 1961 | World Junior Championship | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 13. Westerinen vs A Vinje Gulbrandsen |
| ½-½ | 23 | 1961 | World Junior Championship | C19 French, Winawer, Advance |
| 14. H Pfleger vs Westerinen |
| 1-0 | 56 | 1961 | World Junior Championship | E73 King's Indian |
| 15. Westerinen vs D Thomson |
| 1-0 | 16 | 1961 | World Junior Championship | D45 Queen's Gambit Declined Semi-Slav |
| 16. O Kinnmark vs Westerinen |
| 0-1 | 41 | 1961 | World Junior Championship | C05 French, Tarrasch |
| 17. Westerinen vs A Kuindzhy |
| 0-1 | 62 | 1961 | World Junior Championship | C14 French, Classical |
| 18. B Nagy vs Westerinen |
| 0-1 | 41 | 1961 | World Junior Championship | E43 Nimzo-Indian, Fischer Variation |
| 19. Westerinen vs Parma |
| ½-½ | 25 | 1961 | World Junior Championship | E48 Nimzo-Indian, 4.e3 O-O 5.Bd3 d5 |
| 20. Westerinen vs F Vanhoorne |
| 1-0 | 29 | 1962 | WchT Students 09th Group2 | C91 Ruy Lopez, Closed |
| 21. Westerinen vs F Vanhoorne |
| 1-0 | 27 | 1962 | WchT Students 09th final B | D48 Queen's Gambit Declined Semi-Slav, Meran |
| 22. Fieros vs Westerinen |
| 0-1 | 32 | 1962 | Varna Olympiad qual-3 | B30 Sicilian |
| 23. L Bauza vs Westerinen |
| ½-½ | 40 | 1962 | Varna Olympiad qual-3 | A48 King's Indian |
| 24. A Tarnowski vs Westerinen |
| 1-0 | 61 | 1962 | Varna Olympiad qual-3 | B56 Sicilian |
| 25. G Garcia vs Westerinen |
| 0-1 | 33 | 1962 | Varna Olympiad Final-B | E70 King's Indian |
Kibitzing
