Prepare against Oisin O`cuilleanain
Ireland · World #13,020 classical · FIDE ID 2514249
When preparing against Oisin O`cuilleanain, expect 1.e4 in 80% of White games. Against 1.e4 the reply is 1...c5 (100% of games); against 1.d4, 1...Nf6 (92%).
Our database contains 89 games by Oisin O`cuilleanain, covering May 2019 to Aug 2026. Below you'll find Oisin O`cuilleanain's most-played openings with White and Black, career performance record, notable wins and top events — everything you need to scout Oisin O`cuilleanain before a game. You can open the same data in the free interactive preparation workstation, which builds a move-by-move opening tree from every game.
Ratings
| Time control | Current | Peak | Peak date |
|---|---|---|---|
| Classical | 2,128 | 2,206 | Jun 2026 |
| Rapid | 1,998 | 2,052 | Oct 2025 |
| Blitz | 2,046 | 2,059 | Mar 2024 |
Performance record
| Split | Games | Wins | Draws | Losses | Win rate |
|---|---|---|---|---|---|
| Overall | 89 | 37 | 17 | 35 | 41.6% |
| As White | 46 | 17 | 9 | 20 | 37.0% |
| As Black | 43 | 20 | 8 | 15 | 46.5% |
Move-by-move preparation stats
Straight from the preparation tree built over all of Oisin O`cuilleanain's games — the same tree the interactive prep board lets you walk to any depth. Scores are from Oisin O`cuilleanain's side.
First moves as White (46 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| e4 | 37 | 80.4% | 47.3% |
| c4 | 5 | 10.9% | 50.0% |
| Nf3 | 3 | 6.5% | 50.0% |
| d4 | 1 | 2.2% | 0.0% |
Main lines as White
- 1.e4 — 80% of White games, 47.3% score
- …c5 (57% of these games) — O`cuilleanain usually continues Nf3 (52.5% score)
- …e6 (19% of these games) — O`cuilleanain usually continues d4 (58.3% score)
- …e5 (16% of these games) — O`cuilleanain usually continues Nf3 (50.0% score)
- 1.c4 — 11% of White games, 50.0% score
- …Nf6 (60% of these games) — O`cuilleanain usually continues Nf3 (75.0% score)
- …e6 (20% of these games) — O`cuilleanain usually continues Nf3 (0.0% score)
- …c6 (20% of these games) — O`cuilleanain usually continues Nf3 (100.0% score)
As Black against 1.e4 (21 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| c5 | 21 | 100.0% | 52.4% |
As Black against 1.d4 (13 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| Nf6 | 12 | 92.3% | 79.2% |
| d5 | 1 | 7.7% | 50.0% |
Oisin O`cuilleanain's chess games
All 89 games by Oisin O`cuilleanain in the Chess.ceo database (May 2019 - Aug 2026) are free to browse, search and replay: filter by opening, opponent, event or date on the player page, or step through any game on the analysis board. Record: 37 wins, 17 draws, 35 losses.
Openings as White
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| B90 | Sicilian: Najdorf | 7 | 5/0/2 | 71.4% |
| B28 | Sicilian | 4 | 2/0/2 | 50.0% |
| B33 | Sicilian: Four Knights | 3 | 1/0/2 | 33.3% |
| B30 | Sicilian: Rossolimo | 3 | 1/0/2 | 33.3% |
| C10 | French Defense | 2 | 0/2/0 | 0.0% |
| B00 | Pirc Defense | 2 | 0/1/1 | 0.0% |
| A13 | English Opening: Neo-Catalan | 2 | 0/0/2 | 0.0% |
| C03 | French: Tarrasch Variation | 2 | 0/1/1 | 0.0% |
| E08 | Catalan | 2 | 2/0/0 | 100.0% |
| C53 | Italian Game: Giuoco Pianissimo | 2 | 1/0/1 | 50.0% |
Openings as Black
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| B90 | Sicilian: Najdorf | 10 | 4/1/5 | 40.0% |
| B50 | Sicilian | 4 | 2/1/1 | 50.0% |
| E00 | Catalan | 3 | 3/0/0 | 100.0% |
| A48 | Indian Defense | 3 | 2/1/0 | 66.7% |
| E12 | Queen's Indian Defense | 3 | 2/0/1 | 66.7% |
| A05 | Réti Opening | 3 | 0/1/2 | 0.0% |
| B22 | Sicilian: Alapin | 3 | 1/2/0 | 33.3% |
| A13 | English Opening | 2 | 1/0/1 | 50.0% |
| D38 | Queen's Gambit Declined: Ragozin Defense | 1 | 1/0/0 | 100.0% |
| B21 | Sicilian: Smith-Morra Gambit | 1 | 1/0/0 | 100.0% |
Notable wins
| Date | Opponent | Elo | Event | ECO |
|---|---|---|---|---|
| Jul 2025 | Wiktor Golis | 2,319 | Najdorf Mem Open A | B96 |
| Jan 2026 | Kavin Venkatesan | 2,291 | Irish New Year IM | E12 |
| Jul 2025 | Jan Golecki | 2,279 | Najdorf Mem Open A | B30 |
| Dec 2025 | Jason Liu | 2,257 | Irish New Year IM 2026 | C11 |
| Jun 2026 | Shane Melaugh | 2,223 | 35th Drogheda Chess Congress | Thomson Masters | A13 |
Top events
| Event | Year | Games | Score | TPR |
|---|---|---|---|---|
| Najdorf Mem Open A | 2025 | 9 | 5 | 2,279 |
| 15th London Classic Open | 2025 | 9 | 3 | 2,065 |
| 104th ch-IRL | 2025 | 9 | 5 | 2,072 |
| Irish New Year IM | 2026 | 8 | 2 | 2,053 |
| The 105th Irish Championship 2026 | 2026 | 7 | 4 | 2,223 |
| Dublin Easter International Open | 2025 | 7 | 5 | 2,125 |
| Thomson Masters Drogheda | 2025 | 6 | 2.5 | 2,006 |
| 35th Drogheda Chess Congress | Thomson Masters | 2026 | 6 | 3 | 1,987 |
Interactive opening tree from all 89 games, weak-spot detection and engine analysis.
Start preparationFrequently asked questions
Where can I find Oisin O`cuilleanain's chess games?
89 games by Oisin O`cuilleanain, from May 2019 to Aug 2026, are free to browse and replay move by move — no signup needed. The preparation view groups them into an opening tree showing every line Oisin O`cuilleanain has played.
What does Oisin O`cuilleanain play on the first move as White?
Across 46 games with White in our database, Oisin O`cuilleanain opens with 1.e4 (80% of games), 1.c4 (11% of games), 1.Nf3 (7% of games). Against 1.e4 as Black, Oisin O`cuilleanain answers 1...c5 (100% of games). Against 1.d4: 1...Nf6 (92% of games), 1...d5 (8% of games).
What openings does Oisin O`cuilleanain play as White?
As White, Oisin O`cuilleanain's most-played openings in our database are: Sicilian: Najdorf (7 games, 71.4% win rate); Sicilian (4 games, 50.0% win rate); Sicilian: Four Knights (3 games, 33.3% win rate). The full breakdown of 46 games with White is in the table above.
What openings does Oisin O`cuilleanain play as Black?
As Black, Oisin O`cuilleanain most often plays: Sicilian: Najdorf (10 games, 40.0% win rate); Sicilian (4 games, 50.0% win rate); Catalan (3 games, 100.0% win rate). See the table above for the top ten Black openings across 43 games.
What is Oisin O`cuilleanain's FIDE rating?
Oisin O`cuilleanain is currently rated 2,128 in classical chess, 1,998 in rapid and 2,046 in blitz. Peak classical rating: 2,206 (Jun 2026).
How many games has Oisin O`cuilleanain played?
Our database contains 89 games by Oisin O`cuilleanain, covering May 2019 to Aug 2026. Overall record: 37 wins, 17 draws, 35 losses (41.6% win rate).
How do I prepare against Oisin O`cuilleanain?
89 games by Oisin O`cuilleanain reveal their opening repertoire, most-played lines, and the variations where they score worst — the raw material for targeted preparation. The interactive opening tree lets you walk every line to any depth.