| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. L Sanghed vs T Welin |
| 1-0 | 40 | 1975 | 11th Junior International Tournament | B13 Caro-Kann, Exchange |
| 2. P Iten vs T Welin |
| ½-½ | 22 | 1975 | 11th Junior International Tournament | B16 Caro-Kann, Bronstein-Larsen Variation |
| 3. T Welin vs C M Bjork |
| ½-½ | 26 | 1975 | 11th Junior International Tournament | A07 King's Indian Attack |
| 4. T Welin vs B Adler |
| 1-0 | 31 | 1975 | 11th Junior International Tournament | A18 English, Mikenas-Carls |
| 5. J C Benjamin vs T Welin |
| 0-1 | 62 | 1975 | 11th Junior International Tournament | B10 Caro-Kann |
| 6. M Svenn vs T Welin |
| 1-0 | 40 | 1976 | 11th Junior International Tournament | B10 Caro-Kann |
| 7. T Welin vs A Wengholm |
| 0-1 | 38 | 1976 | 11th Junior International Tournament | A36 English |
| 8. T Welin vs L E Johansson |
| ½-½ | 12 | 1976 | 11th Junior International Tournament | A34 English, Symmetrical |
| 9. M Levai vs T Welin |
| 0-1 | 53 | 1976 | 11th Junior International Tournament | A46 Queen's Pawn Game |
| 10. T Welin vs L Schneider |
| ½-½ | 38 | 1977 | Rilton Cup 1977/78 | B68 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 9...Be7 |
| 11. D Hansson vs T Welin |
| 1-0 | 26 | 1977 | Rilton Cup 1977/78 | B06 Robatsch |
| 12. T Welin vs T Zoltek |
| ½-½ | 42 | 1977 | Rilton Cup 1977/78 | B01 Scandinavian |
| 13. B Adler vs T Welin |
| 0-1 | 26 | 1978 | Rilton Cup 1977/78 | B25 Sicilian, Closed |
| 14. T Welin vs R Weyerstrass |
| ½-½ | 24 | 1978 | Dutch Open | C09 French, Tarrasch, Open Variation, Main line |
| 15. T Welin vs J Eslon |
| ½-½ | 53 | 1978 | Rilton Cup 1978/79 | C69 Ruy Lopez, Exchange, Gligoric Variation |
| 16. T Welin vs A D Martin |
| 0-1 | 27 | 1978 | Rilton Cup 1978/79 | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 17. M Moe vs T Welin |
| 0-1 | 40 | 1978 | Rilton Cup 1978/79 | B57 Sicilian |
| 18. T Welin vs A Olsson |
| 1-0 | 39 | 1979 | Rilton Cup 1978/79 | C67 Ruy Lopez |
| 19. M Sirkia vs T Welin |
| 1-0 | 33 | 1979 | Rilton Cup 1978/79 | A16 English |
| 20. A Ornstein vs T Welin |
| 1-0 | 41 | 1979 | Rilton Cup 1978/79 | B30 Sicilian |
| 21. D Cramling vs T Welin |
| 0-1 | 25 | 1979 | Biel Open | A15 English |
| 22. Y Gruenfeld vs T Welin |
| 1-0 | 30 | 1979 | Biel Open | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 23. H J Beijar vs T Welin |
| ½-½ | 15 | 1980 | SWE-chT corr | B29 Sicilian, Nimzovich-Rubinstein |
| 24. T Welin vs Smyslov |
| 0-1 | 41 | 1980 | Copenhagen Open | E64 King's Indian, Fianchetto, Yugoslav System |
| 25. T Welin vs J Pokojowczyk |
| 1-0 | 33 | 1980 | Copenhagen Open | E75 King's Indian, Averbakh, Main line |
Kibitzing
