Prepare against Ramon Koster
FM · NLD · World #4,026 classical · FIDE ID 1008544
When preparing against Ramon Koster, expect 1.d4 in 76% of White games. Against 1.e4 the reply is 1...c5 (73% of games); against 1.d4, 1...Nf6 (59%). Lowest win rate among frequent openings: Sicilian: Najdorf as Black, 18.8% over 16 games.
Our database contains 204 games by Ramon Koster, covering Apr 2003 to Sep 2026. Below you'll find Ramon Koster's most-played openings with White and Black, career performance record, notable wins and top events — everything you need to scout Ramon Koster 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 | 2,302 | 2,339 | Feb 2025 |
| Rapid | 2,287 | 2,335 | Aug 2025 |
| Blitz | 2,336 | 2,336 | Sep 2026 |
Performance record
| Split | Games | Wins | Draws | Losses | Win rate |
|---|---|---|---|---|---|
| Overall | 204 | 78 | 61 | 65 | 38.2% |
| As White | 107 | 47 | 34 | 26 | 43.9% |
| As Black | 97 | 31 | 27 | 39 | 32.0% |
Move-by-move preparation stats
Straight from the preparation tree built over all of Ramon Koster's games — the same tree the interactive prep board lets you walk to any depth. Scores are from Ramon Koster's side.
First moves as White (107 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| d4 | 81 | 75.7% | 60.5% |
| Nf3 | 15 | 14.0% | 60.0% |
| c4 | 10 | 9.3% | 60.0% |
| e4 | 1 | 0.9% | 0.0% |
Main lines as White
- 1.d4 — 76% of White games, 60.5% score
- …Nf6 (69% of these games) — Koster usually continues c4 (61.1% score)
- …d5 (17% of these games) — Koster usually continues c4 (54.2% score)
- …e6 (6% of these games) — Koster usually continues c4 (70.0% score)
- 1.Nf3 — 14% of White games, 60.0% score
- …d5 (40% of these games) — Koster usually continues c4 (60.0% score)
- …Nf6 (33% of these games) — Koster usually continues c4 (87.5% score)
- …c5 (20% of these games) — Koster usually continues c4 (25.0% score)
As Black against 1.e4 (56 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| c5 | 41 | 73.2% | 42.7% |
| c6 | 7 | 12.5% | 57.1% |
| e6 | 7 | 12.5% | 35.7% |
| e5 | 1 | 1.8% | 50.0% |
As Black against 1.d4 (32 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| Nf6 | 19 | 59.4% | 44.7% |
| d5 | 10 | 31.3% | 70.0% |
| e6 | 3 | 9.4% | 16.7% |
Ramon Koster's chess games
All 204 games by Ramon Koster in the Chess.ceo database (Apr 2003 - 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: 78 wins, 61 draws, 65 losses.
Openings as White
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| E46 | Nimzo-Indian: Rubinstein System | 15 | 5/7/3 | 33.3% |
| A57 | Benoni Defense | 11 | 7/2/2 | 63.6% |
| E90 | King's Indian Defense: Orthodox Variation | 10 | 6/2/2 | 60.0% |
| D82 | Grünfeld Defense | 9 | 6/1/2 | 66.7% |
| A30 | English Opening | 8 | 3/5/0 | 37.5% |
| D35 | Indian Defense | 8 | 3/1/4 | 37.5% |
| E05 | Catalan | 5 | 2/1/2 | 40.0% |
| E14 | Queen's Indian Defense | 5 | 1/4/0 | 20.0% |
| D11 | Slav Defense | 5 | 2/2/1 | 40.0% |
| B14 | English Opening: Slav Setup | 3 | 2/1/0 | 66.7% |
Openings as Black
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| B90 | Sicilian: Najdorf | 16 | 3/4/9 | 18.8% |
| B33 | Sicilian | 15 | 3/7/5 | 20.0% |
| D10 | Slav Defense | 10 | 5/4/1 | 50.0% |
| D75 | Grünfeld Defense | 7 | 3/1/3 | 42.9% |
| A46 | Indian Defense | 5 | 0/2/3 | 0.0% |
| B22 | Sicilian: Alapin | 4 | 2/1/1 | 50.0% |
| A16 | English Opening | 3 | 0/2/1 | 0.0% |
| B12 | Caro-Kann: Advance Variation | 3 | 2/0/1 | 66.7% |
| C18 | French: Winawer Variation | 3 | 1/0/2 | 33.3% |
| B25 | Sicilian: Closed | 3 | 2/1/0 | 66.7% |
Notable wins
| Date | Opponent | Elo | Event | ECO |
|---|---|---|---|---|
| Dec 2001 | Jan Werle | 2,459 | Groningen SO ON | E17 |
| Aug 2005 | Bart Michiels | 2,457 | Stork Young Masters Open | A30 |
| Jul 2004 | Martijn Dambacher | 2,405 | 1st Amsterdam ACT Open | A75 |
| Jul 2004 | Rob Bertholee | 2,398 | 1st Amsterdam ACT Open | E11 |
| Jul 2004 | Merijn Van Delft | 2,389 | 1st Amsterdam ACT Open | C06 |
Top events
| Event | Year | Games | Score | TPR |
|---|---|---|---|---|
| ch-NED U20 | 2003 | 27 | 15 | 2,277 |
| Maia Chess Open 2026 | 2026 | 9 | 5.5 | 2,299 |
| Groningen Harmonie Open A | 2003 | 9 | 6 | 2,355 |
| Hoogeveen Essent Open | 2001 | 9 | 4 | 2,240 |
| 1st Amsterdam ACT Open | 2004 | 9 | 5.5 | 2,507 |
| 15th London Classic Open | 2025 | 9 | 4.5 | 2,235 |
| 61st Groningen Open | 2025 | 9 | 5.5 | 2,342 |
| Groningen SO ON | 2001 | 9 | 3.5 | 2,273 |
Interactive opening tree from all 204 games, weak-spot detection and engine analysis.
Start preparationFrequently asked questions
Where can I find Ramon Koster's chess games?
204 games by Ramon Koster, from Apr 2003 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 Ramon Koster has played.
What does Ramon Koster play on the first move as White?
Across 107 games with White in our database, Ramon Koster opens with 1.d4 (76% of games), 1.Nf3 (14% of games), 1.c4 (9% of games). Against 1.e4 as Black, Ramon Koster answers 1...c5 (73% of games), 1...c6 (13% of games), 1...e6 (13% of games). Against 1.d4: 1...Nf6 (59% of games), 1...d5 (31% of games), 1...e6 (9% of games).
What openings does Ramon Koster play as White?
As White, Ramon Koster's most-played openings in our database are: Nimzo-Indian: Rubinstein System (15 games, 33.3% win rate); Benoni Defense (11 games, 63.6% win rate); King's Indian Defense: Orthodox Variation (10 games, 60.0% win rate). The full breakdown of 107 games with White is in the table above.
What openings does Ramon Koster play as Black?
As Black, Ramon Koster most often plays: Sicilian: Najdorf (16 games, 18.8% win rate); Sicilian (15 games, 20.0% win rate); Slav Defense (10 games, 50.0% win rate). See the table above for the top ten Black openings across 97 games.
What is Ramon Koster's FIDE rating?
Ramon Koster is currently rated 2,302 in classical chess, 2,287 in rapid and 2,336 in blitz. Peak classical rating: 2,339 (Feb 2025).
How many games has Ramon Koster played?
Our database contains 204 games by Ramon Koster, covering Apr 2003 to Sep 2026. Overall record: 78 wins, 61 draws, 65 losses (38.2% win rate).
How do I prepare against Ramon Koster?
204 games by Ramon Koster 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.