| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. T O'Donnell vs K Spraggett |
 | 0-1 | 42 |
1980 |
Ch. Canada, Windsor | B16 Caro-Kann, Bronstein-Larsen Variation |
| 2. Suttles vs T O'Donnell |
| 1-0 | 37 |
1981 |
Vancouver 15-minute | A07 King's Indian Attack |
| 3. K Spraggett vs T O'Donnell |
| 1-0 | 36 |
1986 |
Vancouver | D47 Queen's Gambit Declined Semi-Slav |
| 4. K Spraggett vs T O'Donnell |
| ½-½ | 85 |
1986 |
Keres Memorial | C60 Ruy Lopez |
| 5. T O'Donnell vs B Ivanovic |
| 0-1 | 26 |
1988 |
Saint John op-2 | B17 Caro-Kann, Steinitz Variation |
| 6. T O'Donnell vs K Spraggett |
| 0-1 | 59 |
1988 |
Keres Memorial | B22 Sicilian, Alapin |
| 7. T O'Donnell vs B T Rimawi |
| 0-1 | 23 |
1988 |
Ol | A00 Uncommon Opening |
| 8. Hort vs T O'Donnell |
| 1-0 | 23 |
1988 |
Thessaloniki olm | D36 Queen's Gambit Declined, Exchange, Positional line, 6.Qc2 |
| 9. T O'Donnell vs L Day |
| ½-½ | 16 |
1988 |
9, Oakham House | C60 Ruy Lopez |
| 10. T O'Donnell vs Gipslis |
| 0-1 | 40 |
1988 |
It (open) | B08 Pirc, Classical |
| 11. Y Vetemaa vs T O'Donnell |
| 1-0 | 56 |
1989 |
Vancouver Invitational | B22 Sicilian, Alapin |
| 12. J Benjamin vs T O'Donnell |
| 1-0 | 43 |
1990 |
Mississauga (Canada) | B76 Sicilian, Dragon, Yugoslav Attack |
| 13. V Kovacevic vs T O'Donnell |
 | 1-0 | 49 |
1990 |
Toronto (07) ;CBM 20 | D02 Queen's Pawn Game |
| 14. T O'Donnell vs Vaganian |
| 0-1 | 85 |
1990 |
Toronto | C07 French, Tarrasch |
| 15. T O'Donnell vs V Tukmakov |
| ½-½ | 48 |
1990 |
Toronto1 | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 16. M Marin vs T O'Donnell |
| ½-½ | 61 |
1990 |
Novi Sad Olympiad | D48 Queen's Gambit Declined Semi-Slav, Meran |
| 17. L Day vs T O'Donnell |
| ½-½ | 21 |
1991 |
CAN | A36 English |
| 18. K Spraggett vs T O'Donnell |
| 1-0 | 45 |
1992 |
Ch. Canada, Kingston | A00 Uncommon Opening |
| 19. T O'Donnell vs L Day |
 | 1-0 | 54 |
1992 |
02, CAN zt | C69 Ruy Lopez, Exchange, Gligoric Variation, 6.d4 |
| 20. A Summerscale vs T O'Donnell |
| ½-½ | 19 |
1994 |
San Mateo | D30 Queen's Gambit Declined |
| 21. K Spraggett vs T O'Donnell |
| 1-0 | 57 |
1994 |
Hamilton ch-CAN zt | A13 English |
| 22. T O'Donnell vs A Mortazavi |
| ½-½ | 15 |
1994 |
San Mateo | B40 Sicilian |
| 23. L Day vs T O'Donnell |
| 0-1 | 40 |
1994 |
Canadian National Championships Hamilton CAN ( | C11 French |
| 24. T O'Donnell vs Jean-Philippe Grondin |
| ½-½ | 68 |
1994 |
Ch. Invitation | C57 Two Knights |
| 25. T O'Donnell vs Remlinger |
| 1-0 | 50 |
1994 |
San Mateo | C07 French, Tarrasch |