Prepare against Ruben Gideon Koellner
IM · DEU · World #393 classical · FIDE ID 12993093
When preparing against Ruben Gideon Koellner, expect 1.d4 in 97% of White games. Against 1.e4 the reply is 1...d6 (86% of games); against 1.d4, 1...d6 (82%). Lowest win rate among frequent openings: Ruy Lopez: Classical as Black, 26.7% over 15 games.
Our database contains 2,635 games by Ruben Gideon Koellner, covering Dec 2014 to Sep 2026. Below you'll find Ruben Gideon Koellner's most-played openings with White and Black, career performance record, notable wins and top events — everything you need to scout Ruben Gideon Koellner 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 | 2,533 | 2,533 | Sep 2026 |
| Rapid | 2,425 | 2,438 | Nov 2025 |
| Blitz | 2,384 | 2,422 | Jul 2022 |
Performance record
| Split | Games | Wins | Draws | Losses | Win rate |
|---|---|---|---|---|---|
| Overall | 2,635 | 1,195 | 467 | 973 | 45.4% |
| As White | 1,332 | 652 | 228 | 452 | 48.9% |
| As Black | 1,303 | 543 | 239 | 521 | 41.7% |
Move-by-move preparation stats
Straight from the preparation tree built over all of Ruben Gideon Koellner's games — the same tree the interactive prep board lets you walk to any depth. Scores are from Ruben Gideon Koellner's side.
First moves as White (1,332 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| d4 | 1,295 | 97.2% | 57.1% |
| Nf3 | 16 | 1.2% | 75.0% |
| e4 | 15 | 1.1% | 63.3% |
| h4 | 2 | 0.2% | 100.0% |
| d3 | 2 | 0.2% | 100.0% |
| c3 | 1 | 0.1% | 0.0% |
Main lines as White
- 1.d4 — 97% of White games, 57.1% score
- …Nf6 (55% of these games) — Koellner usually continues Nf3 (59.1% score)
- …d5 (27% of these games) — Koellner usually continues Nf3 (61.7% score)
- …e6 (5% of these games) — Koellner usually continues Nf3 (49.2% score)
- 1.Nf3 — 1% of White games, 75.0% score
- …Nf6 (56% of these games) — Koellner usually continues g3 (90.0% score)
- …d5 (44% of these games) — Koellner usually continues d4 (50.0% score)
As Black against 1.e4 (639 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| d6 | 548 | 85.8% | 54.6% |
| e5 | 74 | 11.6% | 60.1% |
| c5 | 9 | 1.4% | 44.4% |
| c6 | 4 | 0.6% | 87.5% |
| Nf6 | 3 | 0.5% | 66.7% |
As Black against 1.d4 (403 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| d6 | 330 | 81.9% | 48.8% |
| d5 | 46 | 11.4% | 51.1% |
| Nf6 | 19 | 4.7% | 52.6% |
| b6 | 4 | 1.0% | 0.0% |
| e6 | 2 | 0.5% | 50.0% |
| c6 | 1 | 0.2% | 100.0% |
Ruben Gideon Koellner's chess games
All 2,635 games by Ruben Gideon Koellner in the Chess.ceo database (Dec 2014 - Sep 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: 1,195 wins, 467 draws, 973 losses.
Openings as White
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| A45 | Trompowsky Attack | 344 | 160/40/144 | 46.5% |
| D05 | Indian Defense | 182 | 90/37/55 | 49.5% |
| D05 | Colle System | 173 | 92/34/47 | 53.2% |
| D00 | London System | 144 | 77/25/42 | 53.5% |
| D02 | King's Indian Defense | 129 | 59/31/39 | 45.7% |
| D02 | Queen's Pawn Game | 102 | 49/18/35 | 48.0% |
| D05 | Horwitz Defense | 52 | 21/7/24 | 40.4% |
| B06 | Modern Defense | 44 | 25/5/14 | 56.8% |
| A80 | Dutch Defense | 36 | 18/3/15 | 50.0% |
| A41 | Rat Defense | 21 | 7/2/12 | 33.3% |
Openings as Black
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| C41 | Philidor | 491 | 220/80/191 | 44.8% |
| E61 | Indian Defense | 234 | 79/42/113 | 33.8% |
| B07 | Pirc Defense | 103 | 49/14/40 | 47.6% |
| A21 | Queen's Pawn Game | 77 | 45/3/29 | 58.4% |
| D02 | Réti Opening | 67 | 20/11/36 | 29.9% |
| A13 | English Opening | 52 | 16/15/21 | 30.8% |
| B07 | King's Pawn Game | 31 | 13/8/10 | 41.9% |
| A41 | Rat Defense | 23 | 11/3/9 | 47.8% |
| C78 | Ruy Lopez: Morphy Defense | 17 | 9/7/1 | 52.9% |
| C64 | Ruy Lopez: Classical | 15 | 4/10/1 | 26.7% |
Notable wins
| Date | Opponent | Elo | Event | ECO |
|---|---|---|---|---|
| Oct 2024 | Alexey Sarana | 2,713 | Titled Tue Early | D04 |
| May 2022 | Alexei Shirov | 2,695 | Titled Tue Late | C41 |
| Feb 2025 | Bogdan-Daniel Deac | 2,692 | Titled Tue Early | D04 |
| Mar 2024 | Sanan Sjugirov | 2,690 | Titled Tue Early | D02 |
| May 2023 | Alexandr Predke | 2,685 | ChessKid Cup Play In | D05 |
Top events
| Event | Year | Games | Score | TPR |
|---|---|---|---|---|
| Titled Tuesday | 2026 | 1,534 | 792.5 | 2,323 |
| ch-GER U12 | 2016 | 22 | 16.5 | 1,935 |
| Titled Arena May 8th | 2021 | 19 | 6 | 2,194 |
| ch-GER U14 | 2018 | 18 | 12 | 2,109 |
| Chess.com Bullet Open 1 | 2020 | 17 | 6.5 | 2,207 |
| Mitropa Cup | 2023 | 17 | 7 | 2,434 |
| Titled Arena Apr 3rd | 2021 | 17 | 8 | 2,254 |
| ch-GER U16 | 2020 | 16 | 11 | 2,340 |
Frequent opponents
Head-to-head records: David Paravyan (11 games)
Interactive opening tree from all 2,635 games, weak-spot detection and engine analysis.
Start preparationFrequently asked questions
Where can I find Ruben Gideon Koellner's chess games?
2,635 games by Ruben Gideon Koellner, from Dec 2014 to Sep 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 Ruben Gideon Koellner has played.
What does Ruben Gideon Koellner play on the first move as White?
Across 1,332 games with White in our database, Ruben Gideon Koellner opens with 1.d4 (97% of games), 1.Nf3 (1% of games), 1.e4 (1% of games). Against 1.e4 as Black, Ruben Gideon Koellner answers 1...d6 (86% of games), 1...e5 (12% of games), 1...c5 (1% of games). Against 1.d4: 1...d6 (82% of games), 1...d5 (11% of games), 1...Nf6 (5% of games).
What openings does Ruben Gideon Koellner play as White?
As White, Ruben Gideon Koellner's most-played openings in our database are: Trompowsky Attack (344 games, 46.5% win rate); Indian Defense (182 games, 49.5% win rate); Colle System (173 games, 53.2% win rate). The full breakdown of 1,332 games with White is in the table above.
What openings does Ruben Gideon Koellner play as Black?
As Black, Ruben Gideon Koellner most often plays: Philidor (491 games, 44.8% win rate); Indian Defense (234 games, 33.8% win rate); Pirc Defense (103 games, 47.6% win rate). See the table above for the top ten Black openings across 1,303 games.
What is Ruben Gideon Koellner's FIDE rating?
Ruben Gideon Koellner is currently rated 2,533 in classical chess, 2,425 in rapid and 2,384 in blitz. Peak classical rating: 2,533 (Sep 2026).
How many games has Ruben Gideon Koellner played?
Our database contains 2,635 games by Ruben Gideon Koellner, covering Dec 2014 to Sep 2026. Overall record: 1,195 wins, 467 draws, 973 losses (45.4% win rate).
How do I prepare against Ruben Gideon Koellner?
2,635 games by Ruben Gideon Koellner 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.