| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Suttles vs T O'Donnell |
| 1-0 | 37 |
1981 |
Vancouver 15-minute | A07 King's Indian Attack |
| 2. K Spraggett vs T O'Donnell |
| 1-0 | 36 |
1986 |
Vancouver | D47 Queen's Gambit Declined Semi-Slav |
| 3. Hort vs T O'Donnell |
| 1-0 | 23 |
1988 |
Thessaloniki olm | D36 Queen's Gambit Declined, Exchange, Positional line, 6.Qc2 |
| 4. Y Vetemaa vs T O'Donnell |
| 1-0 | 56 |
1989 |
Vancouver Invitational | B22 Sicilian, Alapin |
| 5. J Benjamin vs T O'Donnell |
| 1-0 | 43 |
1990 |
Mississauga (Canada) | B76 Sicilian, Dragon, Yugoslav Attack |
| 6. V Kovacevic vs T O'Donnell |
 | 1-0 | 49 |
1990 |
Toronto (07) ;CBM 20 | D02 Queen's Pawn Game |
| 7. T O'Donnell vs L Day |
| 1-0 | 54 |
1992 |
02, CAN zt | C69 Ruy Lopez, Exchange, Gligoric Variation, 6.d4 |
| 8. K Spraggett vs T O'Donnell |
| 1-0 | 45 |
1992 |
Ch. Canada, Kingston | A00 Uncommon Opening |
| 9. T O'Donnell vs L Busquets |
| 1-0 | 28 |
1994 |
San Mateo | B22 Sicilian, Alapin |
| 10. T O'Donnell vs Remlinger |
| 1-0 | 50 |
1994 |
San Mateo | C07 French, Tarrasch |
| 11. K Spraggett vs T O'Donnell |
| 1-0 | 57 |
1994 |
Hamilton ch-CAN zt | A13 English |
| 12. L Day vs T O'Donnell |
| 1-0 | 31 |
1998 |
Toronto Canada Day | B21 Sicilian, 2.f4 and 2.d4 |
| 13. A Mayo vs T O'Donnell |
| 1-0 | 25 |
2000 |
Charlottetown FIDE Invitational | B23 Sicilian, Closed |
| 14. T O'Donnell vs V Gaspariants |
| 1-0 | 37 |
2001 |
Canadian Open | C69 Ruy Lopez, Exchange, Gligoric Variation, 6.d4 |
| 15. T O'Donnell vs W Taylor |
| 1-0 | 40 |
2001 |
Canadian Open | B05 Alekhine's Defense, Modern |
| 16. T O'Donnell vs R Golts |
| 1-0 | 67 |
2001 |
Canadian Open | C07 French, Tarrasch |
| 17. Miles vs T O'Donnell |
| 1-0 | 53 |
2001 |
Canadian Open | D00 Queen's Pawn Game |
| 18. T O'Donnell vs J Upper |
| 1-0 | 32 |
2007 |
Canadian Open | C05 French, Tarrasch |
| 19. T O'Donnell vs L Mai |
| 1-0 | 57 |
2007 |
Canadian Open | E97 King's Indian |
