Prepare against Leon Koster
FM · NLD · World #5,117 classical · FIDE ID 1008021
Our database contains 33 games by Leon Koster, covering Apr 2003 to Jul 2026. Below you'll find Leon Koster's most-played openings with White and Black, career performance record, notable wins and top events — everything you need to scout Leon 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 | 2,270 | 2,299 | Oct 2015 |
Performance record
| Split | Games | Wins | Draws | Losses | Win rate |
|---|---|---|---|---|---|
| Overall | 33 | 11 | 7 | 15 | 33.3% |
| As White | 15 | 6 | 0 | 9 | 40.0% |
| As Black | 18 | 5 | 7 | 6 | 27.8% |
Move-by-move preparation stats
Straight from the preparation tree built over all of Leon Koster's games — the same tree the interactive prep board lets you walk to any depth. Scores are from Leon Koster's side.
First moves as White (15 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| e4 | 11 | 73.3% | 45.5% |
| d4 | 3 | 20.0% | 33.3% |
| g3 | 1 | 6.7% | 0.0% |
Main lines as White
- 1.e4 — 73% of White games, 45.5% score
- …c5 (64% of these games) — Koster usually continues Nf3 (57.1% score)
- …e5 (27% of these games) — Koster usually continues Nf3 (33.3% score)
- …g6 (9% of these games) — Koster usually continues d4 (0.0% score)
- 1.d4 — 20% of White games, 33.3% score
- …Nf6 (100% of these games) — Koster usually continues c4 (33.3% score)
As Black against 1.e4 (11 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| c5 | 5 | 45.5% | 70.0% |
| e5 | 3 | 27.3% | 50.0% |
| c6 | 2 | 18.2% | 50.0% |
| e6 | 1 | 9.1% | 0.0% |
As Black against 1.d4 (5 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| Nf6 | 5 | 100.0% | 30.0% |
Leon Koster's chess games
All 33 games by Leon Koster in the Chess.ceo database (Apr 2003 - Jul 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: 11 wins, 7 draws, 15 losses.
Openings as White
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| B58 | Sicilian | 2 | 1/0/1 | 50.0% |
| B81 | Sicilian: Najdorf | 2 | 1/0/1 | 50.0% |
| B33 | Sicilian: Sveshnikov | 2 | 2/0/0 | 100.0% |
| E92 | King's Indian Defense: Orthodox Variation | 1 | 0/0/1 | 0.0% |
| B06 | Modern Defense | 1 | 0/0/1 | 0.0% |
| C42 | Petrov's Defense | 1 | 0/0/1 | 0.0% |
| A39 | English Opening: Symmetrical | 1 | 0/0/1 | 0.0% |
| C45 | Scotch Game | 1 | 1/0/0 | 100.0% |
| B78 | Sicilian: Dragon | 1 | 0/0/1 | 0.0% |
| C99 | Ruy Lopez: Closed | 1 | 0/0/1 | 0.0% |
Openings as Black
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| D85 | Grünfeld Defense | 2 | 0/1/1 | 0.0% |
| B92 | Sicilian: Najdorf | 2 | 1/0/1 | 50.0% |
| B19 | Caro-Kann: Classical | 1 | 1/0/0 | 100.0% |
| C07 | French: Tarrasch Variation | 1 | 0/0/1 | 0.0% |
| D85 | Indian Defense | 1 | 0/1/0 | 0.0% |
| C57 | Italian Game: Two Knights Defense | 1 | 1/0/0 | 100.0% |
| E99 | King's Indian Defense: Orthodox Variation | 1 | 0/0/1 | 0.0% |
| A03 | Bird's opening | 1 | 0/1/0 | 0.0% |
| D38 | Queen's Gambit Declined: Ragozin Defense | 1 | 0/1/0 | 0.0% |
| C97 | Ruy Lopez: Closed | 1 | 0/0/1 | 0.0% |
Notable wins
| Date | Opponent | Elo | Event | ECO |
|---|---|---|---|---|
| Jan 1994 | Johan Van Mil | 2,450 | chT-NED 9495 | B19 |
| Jan 1994 | Jeroen Bosch | 2,370 | chT-NED 9495 | A53 |
| Aug 1990 | Igor Jelen | 2,305 | Sas van Gent ECI Open U20 | B33 |
| Dec 1993 | Luc Henris | 2,270 | chT-BEL 9394 | B22 |
| Aug 1990 | Narcisa Mihevc-Mohr | 2,135 | Sas van Gent ECI Open U20 | B33 |
Top events
| Event | Year | Games | Score | TPR |
|---|---|---|---|---|
| Sas van Gent ECI Open U20 | 1990 | 9 | 6 | 2,410 |
| chT-NED 9495 | 1994 | 9 | 3.5 | 2,396 |
| chT-NED 9596 | 1995 | 8 | 2.5 | 2,125 |
| chT-NED 9697 | 1996 | 3 | 1.5 | 2,312 |
| chT-BEL 9394 | 1994 | 2 | 1 | 2,272 |
| chT-BEL 9899 | 1999 | 1 | 0 | 2,130 |
| chT-BEL 9900 | 1999 | 1 | 0 | 2,063 |
Interactive opening tree from all 33 games, weak-spot detection and engine analysis.
Start preparationFrequently asked questions
Where can I find Leon Koster's chess games?
33 games by Leon Koster, from Apr 2003 to Jul 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 Leon Koster has played.
What does Leon Koster play on the first move as White?
Across 15 games with White in our database, Leon Koster opens with 1.e4 (73% of games), 1.d4 (20% of games), 1.g3 (7% of games). Against 1.e4 as Black, Leon Koster answers 1...c5 (45% of games), 1...e5 (27% of games), 1...c6 (18% of games). Against 1.d4: 1...Nf6 (100% of games).
What openings does Leon Koster play as White?
As White, Leon Koster's most-played openings in our database are: Sicilian (2 games, 50.0% win rate); Sicilian: Najdorf (2 games, 50.0% win rate); Sicilian: Sveshnikov (2 games, 100.0% win rate). The full breakdown of 15 games with White is in the table above.
What openings does Leon Koster play as Black?
As Black, Leon Koster most often plays: Grünfeld Defense (2 games, 0.0% win rate); Sicilian: Najdorf (2 games, 50.0% win rate); Caro-Kann: Classical (1 games, 100.0% win rate). See the table above for the top ten Black openings across 18 games.
What is Leon Koster's FIDE rating?
Leon Koster is currently rated 2,270 in classical chess. Peak classical rating: 2,299 (Oct 2015).
How many games has Leon Koster played?
Our database contains 33 games by Leon Koster, covering Apr 2003 to Jul 2026. Overall record: 11 wins, 7 draws, 15 losses (33.3% win rate).
How do I prepare against Leon Koster?
33 games by Leon 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.