| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. D Cossette vs Y Morin |
| 0-1 | 37 | 1987 | Quebec Championship | E12 Queen's Indian |
| 2. F Leveille vs D Cossette |
| ½-½ | 16 | 1987 | Quebec Championship | D34 Queen's Gambit Declined, Tarrasch |
| 3. I Ivanov vs D Cossette |
| 1-0 | 24 | 1987 | Quebec Championship | D32 Queen's Gambit Declined, Tarrasch |
| 4. D Cossette vs P Saint-Amand |
| 0-1 | 39 | 1987 | Quebec Championship | A69 Benoni, Four Pawns Attack, Main line |
| 5. G Spraggett vs D Cossette |
| 1-0 | 78 | 1987 | Quebec Championship | A13 English |
| 6. D Cossette vs S Bolduc |
| 0-1 | 50 | 1987 | Quebec Championship | E12 Queen's Indian |
| 7. S Barbeau vs D Cossette |
| 1-0 | 33 | 1987 | Quebec Championship | D34 Queen's Gambit Declined, Tarrasch |
| 8. G Levtchouk vs D Cossette |
| ½-½ | 45 | 1987 | Quebec Championship | A08 King's Indian Attack |
| 9. D Cossette vs R Girard |
| 0-1 | 49 | 1987 | Quebec Championship | E12 Queen's Indian |
| 10. D Cossette vs S Maurer |
| ½-½ | 42 | 1987 | Quebec Open | D35 Queen's Gambit Declined |
| 11. D Cossette vs M Arsenault |
| ½-½ | 47 | 1987 | Quebec Open | A42 Modern Defense, Averbakh System |
| 12. D Cossette vs D Filipovich |
| ½-½ | 58 | 1996 | North Bay Open | B13 Caro-Kann, Exchange |
| 13. A Desjardins vs D Cossette |
| ½-½ | 33 | 1996 | North Bay Open | B32 Sicilian |
| 14. D Cossette vs J Bidal |
| 0-1 | 55 | 1996 | North Bay Open | A07 King's Indian Attack |
| 15. B Kiviaho vs D Cossette |
| 1-0 | 49 | 1996 | North Bay Open | D51 Queen's Gambit Declined |
| 16. D Cossette vs Y Zaderman |
| 0-1 | 51 | 1998 | North Bay Open | B25 Sicilian, Closed |
| 17. B Campbell vs D Cossette |
| ½-½ | 27 | 1998 | North Bay Open | B23 Sicilian, Closed |
| 18. A Peredun vs D Cossette |
| ½-½ | 50 | 1998 | North Bay Open | B30 Sicilian |
| 19. D Cossette vs Z Khan |
| 1-0 | 46 | 1998 | North Bay Open | C01 French, Exchange |
| 20. B Calton vs D Cossette |
| 1-0 | 41 | 1998 | North Bay Open | D00 Queen's Pawn Game |
| 21. D Southam vs D Cossette |
| 1-0 | 40 | 1998 | North Bay Open | D51 Queen's Gambit Declined |
| 22. D Cossette vs V Gueorguiev |
| 1-0 | 54 | 2011 | Quebec-ch Elite | B39 Sicilian, Accelerated Fianchetto, Breyer Variation |
| 23. M Larochelle vs D Cossette |
| 1-0 | 32 | 2011 | Quebec-ch Elite | A13 English |
| 24. Qiyu Zhou vs D Cossette |
| ½-½ | 62 | 2011 | Quebec-ch Elite | B32 Sicilian |
| 25. D Cossette vs L Jiang |
| 0-1 | 46 | 2011 | Quebec-ch Elite | B23 Sicilian, Closed |
Kibitzing
