| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. J Piket vs J Aijala |
 | 0-1 | 42 |
1964 |
WchT U26 11th fin-B | A43 Old Benoni |
| 2. J Aijala vs C B Wood |
| 0-1 | 31 |
1964 |
WchT U26 11th fin-B | C15 French, Winawer |
| 3. G Pihlgren vs J Aijala |
| 1-0 | 25 |
1964 |
WchT U26 11th fin-B | A38 English, Symmetrical |
| 4. A Marchioli vs J Aijala |
| 0-1 | 55 |
1964 |
WchT U26 11th fin-B | C74 Ruy Lopez, Modern Steinitz Defense |
| 5. R Giot vs J Aijala |
| 0-1 | 40 |
1964 |
WchT U26 11th fin-B | B58 Sicilian |
| 6. J Aijala vs E Mozes |
| ½-½ | 30 |
1964 |
WchT U26 11th fin-B | C15 French, Winawer |
| 7. J Aijala vs Boehnisch |
| 0-1 | 33 |
1966 |
Orebro Stud olm fA | B09 Pirc, Austrian Attack |
| 8. Gulko vs J Aijala |
| 1-0 | 34 |
1966 |
Orebro Stud olm fA | A44 Old Benoni Defense |
| 9. B Sorensen vs J Aijala |
| 1-0 | 26 |
1966 |
Orebro Stud olm fA | D46 Queen's Gambit Declined Semi-Slav |
| 10. J Aijala vs J Stefanov |
| 0-1 | 30 |
1966 |
Orebro Stud olm fA | B14 Caro-Kann, Panov-Botvinnik Attack |
| 11. J Aijala vs B Nagy |
| 0-1 | 37 |
1966 |
Orebro Stud olm fA | B43 Sicilian, Kan, 5.Nc3 |
| 12. Hartston vs J Aijala |
| 1-0 | 41 |
1966 |
Orebro Stud olm fA | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 13. E Scholl vs J Aijala |
| 1-0 | 40 |
1966 |
Orebro Stud olm fA | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 14. J Aijala vs P Maattanen |
| 1-0 | 21 |
1967 |
Finnish Chess Union (SSL) | B09 Pirc, Austrian Attack |
| 15. J Aijala vs F Goethals |
| 0-1 | 27 |
1967 |
WchT U26 14th | B94 Sicilian, Najdorf |
| 16. J Aijala vs I Farago |
| 0-1 | 41 |
1967 |
WchT U26 14th | C01 French, Exchange |
| 17. J Aijala vs J Boudy |
| 1-0 | 62 |
1967 |
WchT U26 14th | D41 Queen's Gambit Declined, Semi-Tarrasch |
| 18. N Ivanov vs J Aijala |
| 1-0 | 62 |
1967 |
WchT U26 14th | A04 Reti Opening |
| 19. J Aijala vs T Leppamaki |
 | 1-0 | 26 |
1968 |
Master Candidates | B89 Sicilian |
| 20. M Boelen vs J Aijala |
| 0-1 | 40 |
1969 |
WchT U26 qual-E | B20 Sicilian |
| 21. P Balaskas vs J Aijala |
| 1-0 | 39 |
1969 |
WchT U26 fin-B 16th | C05 French, Tarrasch |
| 22. E Bukacek vs J Aijala |
| ½-½ | 15 |
1969 |
WchT U26 qual-E | A07 King's Indian Attack |
| 23. A Balshan vs J Aijala |
| 1-0 | 41 |
1969 |
WchT U26 fin-B 16th | C45 Scotch Game |
| 24. E Bukacek vs J Aijala |
| 1-0 | 41 |
1969 |
WchT U26 fin-B 16th | B23 Sicilian, Closed |
| 25. J Aijala vs S Ivanov |
| 0-1 | 45 |
1969 |
WchT U26 qual-E | D48 Queen's Gambit Declined Semi-Slav, Meran |