Oisin O'cuilleanain
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Irish New Year IM 2026 | 12/31/2025 | 2246 |  Ireland |
| 15th London Classic Open | 11/27/2025 | 2314 |  United Kingdom |
| GRENKE Chess Open 2024 | 03/28/2024 | 2324 |  Germany |
| 34th Czech Open A 2023 | 07/21/2023 | 2259 |  Czech Republic |
Most Played Openings as White
| ECO | Opening | Games |
| B11 | Caro-Kann, two knights, 3...Bg4 | 1 games |
| A16 | English opening | 1 games |
| E04 | Catalan, open, 5.Nf3 | 1 games |
| A28 | English, four knights system | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| B51 | Sicilian, Canal-Sokolsky (Nimzovich-Rossolimo, Moscow) attack | 1 games |
| C47 | Four knights, Scotch variation | 1 games |
| B90 | Sicilian, Najdorf | 1 games |
| E10 | Queen's pawn game | 1 games |
