Germany
Male
FIDE ID:
Ruben Gideon Koellner
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Rainer Radtke Mem 2023 | 10/23/2023 | 2227 |  Germany |
| Bundesliga 2023-24 | 10/21/2023 | 2570 | Germany |
| Bundesliga 2022-23 | 10/22/2022 | 2517 | Germany |
| 60th World Juniors 2023 | 09/21/2023 | 2293 |  Mexico |
Ruben Gideon Koellner Repertoire with White pieces (most played)
| ECO | Opening | Games |
| A45 | Queen's pawn game | 21 games |
| D02 | Queen's pawn game | 11 games |
| A40 | Queen's pawn | 8 games |
| D00 | Queen's pawn game | 7 games |
Ruben Gideon Koellner Repertoire with Black pieces (most played)
| ECO | Opening | Games |
| C41 | Philidor's defence | 23 games |
| D37 | Queen's Gambit Declined, 4.Nf3 | 7 games |
| A41 | Queen's Pawn | 7 games |
| D35 | Queen's Gambit Declined, 3...Nf6 | 6 games |
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