| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. O Tessier-Desrosiers vs Eric Bannon |
| 0-1 | 53 |
2001 |
ch-Quebec Prelim | A05 Reti Opening |
| 2. G Mikanovic vs O Tessier-Desrosiers |
| ½-½ | 75 |
2001 |
COQ Open | A58 Benko Gambit |
| 3. O Tessier-Desrosiers vs L Hua |
| 0-1 | 103 |
2001 |
COQ Open | A37 English, Symmetrical |
| 4. V Gaspariants vs O Tessier-Desrosiers |
| 1-0 | 44 |
2001 |
ch-Quebec Prelim | B29 Sicilian, Nimzovich-Rubinstein |
| 5. O Tessier-Desrosiers vs Yvan Constantineau |
| 1-0 | 39 |
2001 |
COQ Open | A09 Reti Opening |
| 6. S Bolduc vs O Tessier-Desrosiers |
| ½-½ | 23 |
2001 |
COQ Open | A30 English, Symmetrical |
| 7. O Tessier-Desrosiers vs Nicolas Soudre |
| ½-½ | 28 |
2001 |
ch-Quebec Prelim | A12 English with b3 |
| 8. O Tessier-Desrosiers vs R Chabot |
| 1-0 | 29 |
2001 |
COQ Open | A21 English |
| 9. O Tessier-Desrosiers vs V Gaspariants |
| 0-1 | 61 |
2001 |
COQ Open | A05 Reti Opening |
| 10. J Trottier vs O Tessier-Desrosiers |
| 0-1 | 25 |
2001 |
COQ Open | A30 English, Symmetrical |
| 11. Audet Bouchard,Nicolas vs O Tessier-Desrosiers |
| 0-1 | 27 |
2001 |
COQ Open | B45 Sicilian, Taimanov |
| 12. C Ouellet Leveille vs O Tessier-Desrosiers |
| ½-½ | 50 |
2001 |
COQ Open | B29 Sicilian, Nimzovich-Rubinstein |
| 13. M Djerkovic vs O Tessier-Desrosiers |
| 1-0 | 31 |
2004 |
77th Canadian Championship | B23 Sicilian, Closed |
| 14. R Gardner vs O Tessier-Desrosiers |
| 1-0 | 77 |
2004 |
77th Canadian Championship | B29 Sicilian, Nimzovich-Rubinstein |
| 15. O Tessier-Desrosiers vs T Schmidt |
 | 1-0 | 36 |
2004 |
77th Canadian Championship | A00 Uncommon Opening |
| 16. O Tessier-Desrosiers vs T Kret |
| ½-½ | 20 |
2004 |
77th Canadian Championship | B33 Sicilian |
| 17. O Tessier-Desrosiers vs H Masse |
| 0-1 | 28 |
2004 |
77th Canadian Championship | A16 English |
| 18. L Day vs O Tessier-Desrosiers |
 | 1-0 | 25 |
2004 |
77th Canadian Championship | A04 Reti Opening |
| 19. G Ng vs O Tessier-Desrosiers |
| 0-1 | 37 |
2004 |
77th Canadian Championship | A00 Uncommon Opening |
| 20. O Tessier-Desrosiers vs E Urquhart |
| 1-0 | 67 |
2004 |
77th Canadian Championship | B13 Caro-Kann, Exchange |
| 21. O Tessier-Desrosiers vs S Predescu |
| 0-1 | 45 |
2004 |
77th Canadian Championship | B92 Sicilian, Najdorf, Opocensky Variation |