Male
FIDE ID:
Ruben Gideon Koellner
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Bundesliga 2025-26 | 09/27/2025 | 2507 |  Germany |
| grenke Chess Open 2026 | 04/02/2026 | 2260 | Germany |
| Bundesliga 2025-26 | 09/27/2025 | 2547 | Germany |
| Bundesliga 2025-26 | 09/27/2025 | 2541 | Germany |
Most Played Openings as White
| ECO | Opening | Games |
| A45 | Queen's pawn game | 29 games |
| D02 | Queen's pawn game | 23 games |
| A48 | King's Indian, East Indian defence | 13 games |
| A40 | Queen's pawn | 11 games |
Most Played Openings as Black
| ECO | Opening | Games |
| C41 | Philidor's defence | 37 games |
| A41 | Queen's Pawn | 10 games |
| C78 | Ruy Lopez, 5.O-O | 9 games |
| D37 | Queen's Gambit Declined, 4.Nf3 | 9 games |
