| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. R O'Donovan vs Hebden |
| 0-1 | 23 |
1985 |
Cork | C31 King's Gambit Declined, Falkbeer Counter Gambit |
| 2. R O'Donovan vs T Spanton |
| 1-0 | 26 |
1994 |
It open | C30 King's Gambit Declined |
| 3. R O'Donovan vs T Mccarthy |
| 1-0 | 56 |
1994 |
Ch Ireland | C34 King's Gambit Accepted |
| 4. R O'Donovan vs K I Norman |
| 1-0 | 44 |
1994 |
It open | C35 King's Gambit Accepted, Cunningham |
| 5. Baburin vs R O'Donovan |
| 1-0 | 41 |
1995 |
It (open) | E60 King's Indian Defense |
| 6. Adams vs R O'Donovan |
| 1-0 | 25 |
1996 |
It (open) | B46 Sicilian, Taimanov Variation |
| 7. R O'Donovan vs E Keogh |
| 1-0 | 41 |
1996 |
Ch Ireland | C31 King's Gambit Declined, Falkbeer Counter Gambit |
| 8. R O'Donovan vs M Heidenfeld |
| 0-1 | 24 |
1997 |
It open | C34 King's Gambit Accepted |
| 9. R O'Donovan vs A Fox |
| 1-0 | 49 |
1997 |
Ch Ireland | C36 King's Gambit Accepted, Abbazia Defense |
| 10. R O'Donovan vs P Short |
 | ½-½ | 19 |
1997 |
It open | C32 King's Gambit Declined, Falkbeer Counter Gambit |
| 11. R O'Donovan vs E Keogh |
| 0-1 | 45 |
1998 |
Iona Tech Masters | C31 King's Gambit Declined, Falkbeer Counter Gambit |
| 12. R O'Donovan vs L Porter |
| ½-½ | 54 |
1998 |
ch-IRL | C34 King's Gambit Accepted |
| 13. R O'Donovan vs E O'Connor |
 | 1-0 | 48 |
1998 |
Masters | C31 King's Gambit Declined, Falkbeer Counter Gambit |
| 14. R O'Donovan vs B Kantsler |
| 0-1 | 57 |
2003 |
European Clubs Cup (Men) | B08 Pirc, Classical |
| 15. R O'Donovan vs P Nikolic |
| 0-1 | 51 |
2003 |
European Clubs Cup (Men) | B08 Pirc, Classical |
| 16. B Schneider vs R O'Donovan |
| 1-0 | 34 |
2005 |
21st European Club Cup | A25 English |
| 17. R O'Donovan vs M Van der Werf |
| 1-0 | 45 |
2005 |
21st European Club Cup | B44 Sicilian |
| 18. M Erdogdu vs R O'Donovan |
| 1-0 | 25 |
2005 |
21st European Club Cup | B42 Sicilian, Kan |
| 19. R Zelcic vs R O'Donovan |
| 1-0 | 27 |
2005 |
21st European Club Cup | B43 Sicilian, Kan, 5.Nc3 |
| 20. R O'Donovan vs H Schaufelberger |
| ½-½ | 53 |
2005 |
21st European Club Cup | B22 Sicilian, Alapin |