J. O'Brien
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Mulcahy op | ??/??/1974 | 0 | Ireland |
Most Played Openings as White
| ECO | Opening | Games |
| B50 | Sicilian | 1 games |
| C02 | French, advance variation | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| A57 | Benko gambit | 1 games |
| C69 | Ruy Lopez, exchange variation, 5.O-O | 1 games |
| C88 | Ruy Lopez, closed | 1 games |


Ireland