Germany
Male
FIDE ID:
Ruben Gideon Koellner
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Bundesliga 2023-24 | 10/21/2023 | 2508 |  Germany |
| GRENKE Chess Open 2024 | 03/28/2024 | 2324 | Germany |
| 4th elllobregat Open 2023 | 11/30/2023 | 2389 |  Spain |
| Rainer Radtke Mem 2023 | 10/23/2023 | 2227 | Germany |
Ruben Gideon Koellner Repertoire with White pieces (most played)
| ECO | Opening | Games |
| A45 | Queen's pawn game | 22 games |
| D02 | Queen's pawn game | 14 games |
| A40 | Queen's pawn | 9 games |
| A48 | King's Indian, East Indian defence | 8 games |
Ruben Gideon Koellner Repertoire with Black pieces (most played)
| ECO | Opening | Games |
| C41 | Philidor's defence | 26 games |
| D37 | Queen's Gambit Declined, 4.Nf3 | 8 games |
| A41 | Queen's Pawn | 7 games |
| D35 | Queen's Gambit Declined, 3...Nf6 | 6 games |
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