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Player profile

Koster, Chiel

Standard: 2218 Rapid: 0 Blitz: 2015 (last updated 2026-11-02)
FIDE ID: 1047990 (view FIDE profile)
Federation: NED Sex: M Birth Year: 1998 Age: 28
Title: CM Women's title: — Other title: — FOA title: —
Games: 40 Wins: 15 (38%) Draws: 12 (30%) Losses: 13 (33%)
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Dossier

39 of 40 games analyzed.

Accuracy: 91.4%
Opened e4: 5/12Opened Nf3: 4/12Opened c4: 2/12Opened d4: 1/12
Same-side castling: 24Castled kingside: 23Castled queenside: 2Did not castle: 1
Fianchettoed kingside: 16Played in the center: 12Played on the kingside: 11Fianchettoed queenside: 4Played on the queenside: 4
Backward pawn: 22Kept the bishop pair: 19Active pieces: 19Sacrificed material: 16Isolated pawn: 15Space advantage: 15Initiated exchanges: 15Avoided exchanges: 6Missed tactics: 5Played gambits: 2
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Openings

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As White 13 games 4W 5D 4L
English Opening 3 games 1W 2D 0L
King's English Variation 2 games 0W 2D 0L
Three Knights System 1 game 0W 1D 0L
Taimanov Variation 1 game 0W 1D 0L
Anglo-Indian Defense 1 game 1W 0D 0L
King's Indian Formation 1 game 1W 0D 0L
Caro-Kann Defense 3 games 0W 1D 2L
(unspecified) 3 games 0W 1D 2L
(unspecified) 3 games 0W 1D 2L
Sicilian Defense 2 games 1W 1D 0L
Kan Variation 1 game 1W 0D 0L
Swiss Cheese Variation 1 game 1W 0D 0L
Scheveningen Variation 1 game 0W 1D 0L
Delayed Keres Attack 1 game 0W 1D 0L
Neo-Grünfeld Defense 2 games 2W 0D 0L
Classical Variation 1 game 1W 0D 0L
(unspecified) 1 game 1W 0D 0L
Ultra-Delayed Exchange Variation 1 game 1W 0D 0L
(unspecified) 1 game 1W 0D 0L
Tarrasch Defense 1 game 0W 1D 0L
Classical Variation 1 game 0W 1D 0L
(unspecified) 1 game 0W 1D 0L
King's Indian Defense 1 game 0W 0D 1L
Fianchetto Variation 1 game 0W 0D 1L
Yugoslav Variation, Advance Line 1 game 0W 0D 1L
Italian Game 1 game 0W 0D 1L
Two Knights Defense 1 game 0W 0D 1L
Modern Bishop's Opening 1 game 0W 0D 1L
As Black 14 games 6W 5D 3L
Sicilian Defense 7 games 4W 2D 1L
Lasker-Pelikan Variation 4 games 2W 2D 0L
Sveshnikov Variation, Chelyabinsk Variation 2 games 1W 1D 0L
(unspecified) 1 game 0W 1D 0L
Sveshnikov Variation 1 game 1W 0D 0L
Nyezhmetdinov-Rossolimo Attack 2 games 2W 0D 0L
Fianchetto Variation 2 games 2W 0D 0L
Old Sicilian 1 game 0W 0D 1L
(unspecified) 1 game 0W 0D 1L
English Opening 2 games 1W 0D 1L
Symmetrical Variation 1 game 0W 0D 1L
Fianchetto Variation 1 game 0W 0D 1L
King's English Variation 1 game 1W 0D 0L
Taimanov Variation 1 game 1W 0D 0L
Queen's Pawn Game 1 game 0W 0D 1L
London System 1 game 0W 0D 1L
with e6 1 game 0W 0D 1L
Trompowsky Attack 1 game 0W 1D 0L
(unspecified) 1 game 0W 1D 0L
(unspecified) 1 game 0W 1D 0L
Rapport-Jobava System 1 game 0W 1D 0L
(unspecified) 1 game 0W 1D 0L
(unspecified) 1 game 0W 1D 0L
King's Indian Attack 1 game 1W 0D 0L
(unspecified) 1 game 1W 0D 0L
(unspecified) 1 game 1W 0D 0L
French Defense 1 game 0W 1D 0L
Rubinstein Variation 1 game 0W 1D 0L
Blackburne Defense 1 game 0W 1D 0L
Blunders Top 4 of 133

This player's costliest moves in analyzed games. Can you find the winning move?

2025.05.18 · 46. Kf6 (−42.8% win chance) 1/2-1/2
Kazarjan, Gachatur
Koster, Chiel
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2023.07.29 · 29. Qf5 (−38.5% win chance) 1-0
Jakob Weidemann
Chiel Koster
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2024.07.30 · 65. Kb5 (−37.6% win chance) 0-1
Buckels, Valentin
Koster, Chiel
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2025.06.07 · 28... cxd4 (−36.9% win chance) 1-0
Koster, Chiel
Barzen, Pascal
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Games Showing all 40 games
Date Event Round Color Opponent Result Accuracy % First moves