KNSB FIDE
CK

Chiel Koster

Rated since January 2023

2225 Classic
2147 Rapid
2147 Blitz

RIVALRY

Nemesis
Shakhverdian, W. (William)
Games: 4 · Win rate: 75%

The good & the bad

Best wins
BASELMANS, L. (LUUK) (FM) 2346
5965 13e WLC Weekendtoernooi Groep A · Saturday 6 May 2023
PLASSCHE VAN DE, B.J. (BAS) (FM) 2339
11991 KNSB competitie 2025-2026 Klasse 2 ronde 2 · Saturday 4 October 2025
KLAPWIJK, K.B. (BRAM) 2264
7014 KNSB competitie 2022-2023 Klasse 2 ronde 9 · Saturday 22 April 2023
STILLGER, B. (BERNHARD) (FM) 2263
9337 Open NK Schaken 2024 Open NK Schaken 2024 · Monday 29 July 2024
HAGEN VAN DER, L.G.J. (LOEK) (FM) 2241
9353 17e BPB Limburg Open 2025 Groep A · Saturday 7 June 2025
Worst losses
ZEGVELD, R. (RICK) 1997
11984 NBSB Avondcompetitie 2025-2026 Ronde 3 · Monday 10 November 2025
ALBERS, S. (SAŠA) (FM) 2113
6233 KNSB competitie 2022-2023 Klasse 2 ronde 5 · Saturday 17 December 2022
DRIES OP DEN, J. (JOHAN) 2131
5259 Chessable Open NK 2023 Open NK · Wednesday 2 August 2023
GOOL VAN, R. (RUDI) 2136
7578 KNSB competitie 2023-2024 Klasse 2 ronde 1 · Saturday 16 September 2023
PEERLINGS, C.C.L. (CAMIEL) 2161
7638 KNSB competitie 2023-2024 Klasse 2 ronde 2 · Saturday 7 October 2023
17e BPB Limburg Open 2025 Groep A Friday 6 June 2025 +3–2=2 +23.0
15e WLC Weekendtoernooi Groep A Friday 16 May 2025 +2–0=3 +10.4
14e WLC Weekendtoernooi Groep A Friday 31 May 2024 +3–2=1 +8.5
13e WLC Weekendtoernooi Groep A Friday 5 May 2023 +4–1=1 +44.6
NBSB Avondcompetitie 2025-2026 Ronde 7 Monday 22 September 2025 +2–0=0 +7.3
NBSB Avondcompetitie 2025-2026 Ronde 4 Monday 22 September 2025 +1–0=0 +3.0
NBSB Avondcompetitie 2025-2026 Ronde 3 Monday 22 September 2025 +0–1=0 -14.9
KNSB competitie 2025-2026 Klasse 2 ronde 6 Saturday 20 September 2025 +2–0=0 +5.1
KNSB competitie 2025-2026 Klasse 2 ronde 8 Saturday 20 September 2025 +2–0=0 +14.9
KNSB competitie 2025-2026 KNSB Beker ronde 2 voor januari rating Saturday 20 September 2025 +0–1=0 -5.7
KNSB competitie 2025-2026 Klasse 2 ronde 5 Saturday 20 September 2025 +0–0=1 +2.4
KNSB competitie 2025-2026 Klasse 2 Ronde 4 Saturday 20 September 2025 +0–0=1 +0.9
KNSB competitie 2025-2026 Klasse 2 ronde 3 Saturday 20 September 2025 +0–0=1 +6.4
KNSB competitie 2025-2026 Klasse 2 ronde 2 Saturday 20 September 2025 +1–0=0 +13.4
KNSB competitie 2025-2026 Klasse 2 ronde 1 Saturday 20 September 2025 +1–0=0 +10.3
NBSB Beker A 2024-2025 Ronde 1 Saturday 19 October 2024 +0–1=0 -1.2
NBSB Avondcompetitie 2024-2025 Ronde 4 Monday 30 September 2024 +1–0=0 +7.5
NBSB Avondcompetitie 2024-2025 Ronde 3 Monday 30 September 2024 +0–1=0 -4.3
KNSB competitie 2024-2025 Klasse 3 ronde 9 Saturday 21 September 2024 +1–0=0 +5.4
KNSB competitie 2024-2025 Klasse 3 ronde 8 Saturday 21 September 2024 +1–0=0 +6.3
KNSB competitie 2024-2025 Klasse 3 ronde 7 Saturday 21 September 2024 +1–0=0 +3.8
KNSB competitie 2024-2025 Klasse 3 ronde 6 Saturday 21 September 2024 +0–0=1 +0.4
KNSB competitie 2024-2025 Klasse 3 ronde 5 Saturday 21 September 2024 +1–0=0 +7.9
KNSB competitie 2024-2025 Klasse 3 ronde 4 Saturday 21 September 2024 +0–0=1 +1.2
KNSB competitie 2024-2025 Klasse 3 ronde 3 + inhaalwedstrijd ronde 1 Saturday 21 September 2024 +1–0=0 +3.9
KNSB competitie 2024-2025 KNSB Beker voor novemberlijst Saturday 21 September 2024 +0–1=0 -10.0
KNSB competitie 2024-2025 Klasse 3 ronde 1 Saturday 21 September 2024 +1–0=0 +7.3
Open NK Schaken 2024 Open NK Schaken 2024 Monday 22 July 2024 +2–2=5 +21.8
NBSB Competitie 2023/2024 2e helft Groep A Sunday 24 December 2023 +0–1=0 -3.9
KNSB competitie 2023-2024 Klasse 2 ronde 9 Saturday 16 September 2023 +1–0=0 +15.6
KNSB competitie 2023-2024 Klasse 2 ronde 7 Saturday 16 September 2023 +0–1=0 -6.4
KNSB competitie 2023-2024 Klasse 2 ronde 6 Saturday 16 September 2023 +1–0=0 +8.4
KNSB competitie 2023-2024 Klasse 2 ronde 3 Saturday 16 September 2023 +0–1=0 -9.3
KNSB competitie 2023-2024 Klasse 2 ronde 2 Saturday 16 September 2023 +0–1=0 -10.5
KNSB competitie 2023-2024 Klasse 2 ronde 1 Saturday 16 September 2023 +0–1=0 -11.5
Chessable Open NK 2023 Open NK Monday 24 July 2023 +2–5=1 -21.7
KNSB competitie 2022-2023 Klasse 2 ronde 9 Saturday 17 September 2022 +1–0=0 +18.9
KNSB competitie 2022-2023 Klasse 2 ronde 8 Saturday 17 September 2022 +1–0=0 +11.7
KNSB competitie 2022-2023 Klasse 2 ronde 7 Saturday 17 September 2022 +1–0=0 +17.9
KNSB competitie 2022-2023 Klasse 2 ronde 5 Saturday 17 September 2022 +0–1=0 -10.3
KNSB competitie 2022-2023 Klasse 2 ronde 4 Saturday 17 September 2022 +1–0=0 +7.3

Rating History

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Peak Ratings

Classic 2225 April 1, 2026
Rapid 2147 March 1, 2026
Blitz 2147 March 1, 2026

Games

Wins 38
Losses 23
Draws 18
Win Rate 48%

Performance by Color

Color Wins Draws Losses Win Rate
White 19 8 15 45%
Black 19 10 8 51%

Recent Matches

Morren, E.J. (Eric Jan) (1890) Saturday 28 March 2026 WIN +2.5
Morren, E.J. (Eric Jan) (1890) Saturday 28 March 2026 WIN +2.5
Bezouw van, R. (Roel) (1959) Thursday 19 March 2026 WIN +3.7
Bezouw van, R. (Roel) (1959) Thursday 19 March 2026 WIN +3.7
Shakhverdian, W. (William) (2126) Saturday 7 March 2026 WIN +7.5
Shakhverdian, W. (William) (2126) Saturday 7 March 2026 WIN +7.5
FM Lenaerts, L. (Lennert) (2366) Sunday 14 December 2025 LOSS -5.7
FM Kuipers, E.F. (Eelco) (2299) Saturday 13 December 2025 DRAW +2.4
Haast, R. (Rob) (1921) Tuesday 9 December 2025 WIN +3.0
Nabuurs, J. (Joep) (2252) Saturday 22 November 2025 DRAW +0.9
Zegveld, R. (Rick) (1997) Monday 10 November 2025 LOSS -14.9
GM Solleveld, M. (Maarten) (2501) Saturday 1 November 2025 DRAW +6.4
FM Plassche van de, B.J. (Bas) (2339) Saturday 4 October 2025 WIN +13.4
CM Stotyn, F. (Fabian) (2204) Saturday 20 September 2025 WIN +10.3
Eckardt, Joshua (2241) Monday 9 June 2025 LOSS -8.7
Kazarjan, G. (Gachatur) (2258) Monday 9 June 2025 DRAW +2.5
FM Kurt, S. (Sascha) (2312) Sunday 8 June 2025 DRAW +4.0
Edwardss, D. (Dylan) (2127) Sunday 8 June 2025 WIN +9.3
FM Barzen, Pascal (2348) Saturday 7 June 2025 LOSS -5.8
FM Hagen van der, L.G.J. (Loek) (2241) Saturday 7 June 2025 WIN +12.7