| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. B Ostenstad vs M O'Cinneide |
| 1-0 | 28 | 1984 | World Junior Championship | E59 Nimzo-Indian, 4.e3, Main line |
| 2. M O'Cinneide vs M Herrera Ortiz |
| 1-0 | 40 | 1984 | World Junior Championship | A14 English |
| 3. P Wolff vs M O'Cinneide |
| 1-0 | 47 | 1984 | World Junior Championship | B44 Sicilian |
| 4. M O'Cinneide vs J Klinger |
| 1-0 | 33 | 1984 | World Junior Championship | A16 English |
| 5. C Navrotescu vs M O'Cinneide |
| 1-0 | 27 | 1984 | World Junior Championship | E47 Nimzo-Indian, 4.e3 O-O 5.Bd3 |
| 6. M O'Cinneide vs O Mera |
| 1-0 | 35 | 1984 | World Junior Championship | D35 Queen's Gambit Declined |
| 7. B Miljanic vs M O'Cinneide |
| 1-0 | 41 | 1984 | World Junior Championship | A07 King's Indian Attack |
| 8. M O'Cinneide vs A Kolev |
| 0-1 | 59 | 1984 | World Junior Championship | A10 English |
| 9. J Adler vs M O'Cinneide |
| 1-0 | 37 | 1984 | World Junior Championship | E11 Bogo-Indian Defense |
| 10. M O'Cinneide vs B Lacroix |
| 1-0 | 28 | 1984 | World Junior Championship | A16 English |
| 11. M O'Cinneide vs A W Alothman |
| 0-1 | 66 | 1984 | World Junior Championship | A30 English, Symmetrical |
| 12. R Buckmire vs M O'Cinneide |
| ½-½ | 37 | 1984 | World Junior Championship | E47 Nimzo-Indian, 4.e3 O-O 5.Bd3 |
| 13. M O'Cinneide vs D Baudot |
| 1-0 | 36 | 1984 | World Junior Championship | A13 English |
| 14. M O'Cinneide vs A Antunes |
| ½-½ | 38 | 1993 | EUCup Gr6 | A13 English |
| 15. M O'Cinneide vs A Baburin |
| ½-½ | 28 | 1993 | Mullingar | A14 English |
| 16. C Crouch vs M O'Cinneide |
| 1-0 | 15 | 1993 | Dublin Zonal | E39 Nimzo-Indian, Classical, Pirc Variation |
| 17. M O'Cinneide vs K McHugh |
| 0-1 | 36 | 1993 | Dublin Zonal | A15 English |
| 18. P Reynolds vs M O'Cinneide |
| 0-1 | 41 | 1993 | Dublin Zonal | A35 English, Symmetrical |
| 19. M O'Cinneide vs C Duncan |
| 1-0 | 31 | 1993 | Dublin Zonal | A28 English |
| 20. F Rayner vs M O'Cinneide |
| ½-½ | 34 | 1993 | Dublin Zonal | B16 Caro-Kann, Bronstein-Larsen Variation |
| 21. M O'Cinneide vs G Wall |
| 1-0 | 49 | 1993 | Dublin Zonal | A36 English |
| 22. J Parker vs M O'Cinneide |
| 1-0 | 19 | 1993 | Dublin Zonal | E30 Nimzo-Indian, Leningrad |
| 23. M O'Cinneide vs A P Smith |
| 1-0 | 44 | 1993 | Dublin Zonal | A28 English |
| 24. Miles vs M O'Cinneide |
| 1-0 | 57 | 1993 | Dublin Zonal | E11 Bogo-Indian Defense |
| 25. M O'Cinneide vs J Ryan |
| ½-½ | 55 | 1993 | Dublin Zonal | A13 English |
Kibitzing
