| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. K Spraggett vs T O'Donnell |
| ½-½ | 85 |
1986 |
Keres Memorial | C60 Ruy Lopez |
| 2. T O'Donnell vs L Day |
| ½-½ | 16 |
1988 |
9, Oakham House | C60 Ruy Lopez |
| 3. T O'Donnell vs V Tukmakov |
| ½-½ | 48 |
1990 |
Toronto1 | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 4. M Marin vs T O'Donnell |
| ½-½ | 61 |
1990 |
Novi Sad Olympiad | D48 Queen's Gambit Declined Semi-Slav, Meran |
| 5. L Day vs T O'Donnell |
| ½-½ | 21 |
1991 |
CAN | A36 English |
| 6. Hebert vs T O'Donnell |
| ½-½ | 36 |
1994 |
Quebec op | D47 Queen's Gambit Declined Semi-Slav |
| 7. T O'Donnell vs A Mortazavi |
| ½-½ | 15 |
1994 |
San Mateo | B40 Sicilian |
| 8. B Izumikawa vs T O'Donnell |
| ½-½ | 35 |
1994 |
San Mateo | D45 Queen's Gambit Declined Semi-Slav |
| 9. T O'Donnell vs Shaked |
| ½-½ | 39 |
1994 |
San Mateo | B40 Sicilian |
| 10. T O'Donnell vs L Day |
| ½-½ | 12 |
1994 |
Toronto Open | B08 Pirc, Classical |
| 11. A Summerscale vs T O'Donnell |
| ½-½ | 19 |
1994 |
San Mateo | D30 Queen's Gambit Declined |
| 12. T O'Donnell vs K Spraggett |
| ½-½ | 21 |
1994 |
Winnipeg CAN-open | B06 Robatsch |
| 13. M Leski vs T O'Donnell |
| ½-½ | 16 |
1994 |
San Mateo | A07 King's Indian Attack |
| 14. T O'Donnell vs Jean-Philippe Grondin |
| ½-½ | 68 |
1994 |
Ch. Invitation | C57 Two Knights |
| 15. B Kreiman vs T O'Donnell |
| ½-½ | 14 |
1995 |
Marshall CC int fin | B62 Sicilian, Richter-Rauzer |
| 16. R Ziatdinov vs T O'Donnell |
| ½-½ | 21 |
1999 |
Koltanowski Team Match | C60 Ruy Lopez |
| 17. T O'Donnell vs Christiansen |
| ½-½ | 51 |
2001 |
Canadian Open | C69 Ruy Lopez, Exchange, Gligoric Variation, 6.d4 |
| 18. F Kleist vs T O'Donnell |
| ½-½ | 34 |
2001 |
Canadian Open | D30 Queen's Gambit Declined |
| 19. I Bluvshtein vs T O'Donnell |
| ½-½ | 34 |
2001 |
Canadian Open | B67 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 8...Bd7 |
| 20. B Cheng vs T O'Donnell |
| ½-½ | 61 |
2007 |
Canadian Open | D11 Queen's Gambit Declined Slav |