IMRuben Gideon Koellner
GER · FIDE ID 12993093 · 331 tournament games since 2021
Standard
2535
#20 in GER (active)
Rapid
2425
#54 in GER (active)
Blitz
2384
#119 in GER (active)
Score
61%
143 W · 119 D · 69 L
Opp. avg
2305
Last 50 games
Last game
2026-08-12
Oberbank Challenger Open 2026
Prep summary
- As White: 1.d4 in 94% of games (scores 63%).
- Against 1.e4: 1...d6 in 51 of 90 games (Pirc Defense), scoring 64%.
- Against 1.d4: 1...d6 in 23 of 46 games (Queen's Pawn Game), scoring 61%.
- Weak spot: King's Indian Attack as Black, only 30% in 5 games.
- Comfort zone: Queen's Pawn Game: London System as White, 81% in 13 games.
- By opponent strength: 37% against higher-rated players, 77% against lower-rated.
Based on 331 over-the-board games (54 classical · 18 rapid · 4 blitz). 165 with White (63%), 166 with Black (59%).
Openings as White
First move
| 1.d4 | 155 | 63% |
| 1.e4 | 7 | 57% |
| 1.Nf3 | 3 | 67% |
Most played
| Opening | Games | Score |
|---|---|---|
| Queen's Pawn Game: Colle System | 26 | 60% |
| East Indian Defense | 23 | 54% |
| Trompowsky Attack | 18 | 61% |
| Queen's Pawn Game: London System | 13 | 81% |
| Queen's Pawn Game: Symmetrical Variation | 9 | 72% |
Openings as Black
Against 1.e4 (90 games)
| 1...d6 Pirc Defense | 51 | 64% |
| 1...e5 King's Pawn Game | 39 | 59% |
Against 1.d4 (46 games)
| 1...d6 Queen's Pawn Game | 23 | 61% |
| 1...d5 Queen's Pawn Game | 22 | 50% |
| 1...Nf6 Indian Defense | 1 | 0% |
Most played
| Opening | Games | Score |
|---|---|---|
| Philidor Defense: Lion Variation | 29 | 64% |
| Pirc Defense | 18 | 72% |
| Ruy Lopez: Morphy Defense, Møller Variation | 10 | 60% |
| Indian Defense: Wade-Tartakower Defense | 10 | 40% |
| Bogo-Indian Defense: Retreat Variation | 6 | 67% |
Recent games
| Date | Opponent and event | Result |
|---|---|---|
| 2026-08-12 | Florentin Stickler (2278) Oberbank Challenger Open 2026 | ½ |
| 2026-08-12 | Olga Badelka (2416) Oberbank Challenger Open 2026 | ½ |
| 2026-08-12 | David Schernthaner (2380) Oberbank Challenger Open 2026 | W |
| 2026-08-12 | Jakob Postlmayer (2440) Oberbank Challenger Open 2026 | W |
| 2026-08-12 | Gerald Hertneck (2415) Oberbank Challenger Open 2026 | W |
| 2026-08-12 | Julian Leitgeb (2298) Oberbank Challenger Open 2026 | ½ |
| 2026-08-12 | Artur Steinhauer (2187) Oberbank Challenger Open 2026 | W |
| 2026-08-12 | Niklas Wunder (2122) Oberbank Challenger Open 2026 | W |
| 2026-08-12 | Marco Vincenzi (2017) Oberbank Challenger Open 2026 | W |
| 2026-08-09 | Felix Werthebach (2202) 16. Nordhäuser Open | W |
Data: FIDE rating list (October 2026 list; national ranks count active players) and tournament games broadcast on Lichess since 2020 (open data, CC0). Results are matched to FIDE players by name or FIDE ID and may be incomplete. This page shows public chess results only. Is this you and you want the page removed? Email chessmoose1@gmail.com and we remove it.