Prepare against Chiel Koster

CM · NLD · World #7,661 classical · FIDE ID 1047990

Our database contains 85 games by Chiel Koster, covering Jun 2014 to Jul 2026. Below you'll find Chiel Koster's most-played openings with White and Black, career performance record, notable wins and top events — everything you need to scout Chiel 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

Performance record

Move-by-move preparation stats

Straight from the preparation tree built over all of Chiel Koster's games — the same tree the interactive prep board lets you walk to any depth. Scores are from Chiel Koster's side.

First moves as White (41 games)

Main lines as White

• 1.e4 — 63% of White games, 55.8% score
  • …c5 (38% of these games) — Koster usually continues Nf3 (50.0% score)
  • …e5 (15% of these games) — Koster usually continues Nf3 (66.7% score)
  • …d5 (15% of these games) — Koster usually continues Nc3 (75.0% score)
• 1.Nc3 — 12% of White games, 60.0% score
  • …d5 (60% of these games) — Koster usually continues e4 (66.7% score)
  • …b6 (20% of these games) — Koster usually continues d4 (0.0% score)
  • …d6 (20% of these games) — Koster usually continues e4 (100.0% score)

As Black against 1.e4 (30 games)

As Black against 1.d4 (7 games)

Chiel Koster's chess games

All 85 games by Chiel Koster in the Chess.ceo database (Jun 2014 - 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: 33 wins, 24 draws, 28 losses.

Openings as White

Openings as Black

Notable wins

Top events

Frequently asked questions

Where can I find Chiel Koster's chess games?

85 games by Chiel Koster, from Jun 2014 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 Chiel Koster has played.

What does Chiel Koster play on the first move as White?

Across 41 games with White in our database, Chiel Koster opens with 1.e4 (63% of games), 1.Nc3 (12% of games), 1.c4 (10% of games). Against 1.e4 as Black, Chiel Koster answers 1...c5 (80% of games), 1...e6 (17% of games), 1...d6 (3% of games). Against 1.d4: 1...Nf6 (100% of games).

What openings does Chiel Koster play as White?

As White, Chiel Koster's most-played openings in our database are: Dunst Opening (5 games, 40.0% win rate); Scandinavian Defense (4 games, 75.0% win rate); Sicilian: Najdorf (4 games, 25.0% win rate). The full breakdown of 41 games with White is in the table above.

What openings does Chiel Koster play as Black?

As Black, Chiel Koster most often plays: Sicilian (9 games, 44.4% win rate); Sicilian: Sveshnikov (8 games, 25.0% win rate); Sicilian: Rossolimo (3 games, 33.3% win rate). See the table above for the top ten Black openings across 44 games.

What is Chiel Koster's FIDE rating?

Chiel Koster is currently rated 2,211 in classical chess and 2,015 in blitz. Peak classical rating: 2,211 (Jul 2026).

How many games has Chiel Koster played?

Our database contains 85 games by Chiel Koster, covering Jun 2014 to Jul 2026. Overall record: 33 wins, 24 draws, 28 losses (38.8% win rate).

How do I prepare against Chiel Koster?

85 games by Chiel 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.

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