Chiel Koster

Country

NED

Birth Year

1998

Gender

M

Title

Candidate Master

FIDE ID

1047990

FIDE ratings

2226

Classical

Published FIDE

—

Rapid

Published FIDE

2015

Blitz

Published FIDE

Official classical ranks

World rank
#6927
National rank · NED
#235

Active players · Oct 2026 FIDE list ⓘ

Rating history

Highest recorded rating
2226 Oct 2026
Recorded years
2014–2026
Archived games
63

Based on available monthly lists and saved games.

FIDE rating history

Published rating lists through Oct 2026.

View rating lists
Available Games

Published games available in our archive; coverage varies by tournament. Archive last checked: 2026-10-07 (UTC).

# Date Event Site Round White Black Result Moves View
1 2025-06-08 17th BPB Limburg Open Maastricht NED 5.8 Chiel Koster Sascha Kurt 1/2-1/2 22 Open
2 2025-06-07 17th BPB Limburg Open Maastricht NED 3.6 Pascal Barzen Chiel Koster 1-0 40 Open
3 2025-05-18 15th WLC Weekender 2025 Eindhoven NED 6.4 Noah Ritzerveld Chiel Koster 1/2-1/2 44 Open
4 2025-05-18 15th WLC Weekender 2025 Eindhoven NED 5.6 Chiel Koster Gachatur Kazarjan 1/2-1/2 49 Open
5 2025-05-17 15th WLC Weekender 2025 Eindhoven NED 3.11 Tom Vennix Chiel Koster 0-1 45 Open
6 2025-05-17 15th WLC Weekender 2025 Eindhoven NED 2.16 Chiel Koster Emma De Vries 1-0 30 Open
7 2025-05-16 15th WLC Weekender 2025 Eindhoven NED 1.17 Pim Blijlevens Chiel Koster 1/2-1/2 45 Open
8 2024-08-01 Dutch Open 2024 Velp NED 9.15 Chiel Koster Tommy Grooten 1/2-1/2 24 Open
9 2024-07-31 Dutch Open 2024 Velp NED 8.15 Jasper Zwirs Chiel Koster 1/2-1/2 25 Open
10 2024-07-30 Dutch Open 2024 Velp NED 7.7 Chiel Koster Valentin Buckels 0-1 76 Open
11 2024-07-29 Dutch Open 2024 Velp NED 6.12 Bernhard Stillger Chiel Koster 0-1 68 Open
12 2024-07-27 Dutch Open 2024 Velp NED 5.21 Chiel Koster Manuel Smit 1-0 42 Open
13 2024-07-26 Dutch Open 2024 Velp NED 4.21 Vadim Van Kuijk Chiel Koster 1/2-1/2 34 Open
14 2024-07-25 Dutch Open 2024 Velp NED 3.13 Chiel Koster William Shakhverdian 0-1 55 Open
15 2024-07-24 Dutch Open 2024 Velp NED 2.14 Noah Ritzerveld Chiel Koster 1/2-1/2 50 Open
16 2024-07-23 Dutch Open 2024 Velp NED 1.14 Chiel Koster Herman Grooten 1/2-1/2 66 Open
17 2024-06-02 14th WLC Weekender 2024 Eindhoven NED 6.5 Chiel Koster Sam Baselmans 0-1 24 Open
18 2024-06-02 14th WLC Weekender 2024 Eindhoven NED 5.11 Joshua Coronel Chiel Koster 0-1 51 Open
19 2024-06-01 14th WLC Weekender 2024 Eindhoven NED 4.6 Chiel Koster Thomas Kools 1/2-1/2 15 Open
20 2024-06-01 14th WLC Weekender 2024 Eindhoven NED 3.11 Mitchell Matthijssen Chiel Koster 0-1 37 Open
21 2024-06-01 14th WLC Weekender 2024 Eindhoven NED 2.2 Chiel Koster Thomas Beerdsen 0-1 28 Open
22 2024-05-31 14th WLC Weekender 2024 Eindhoven NED 1.13 Niels Van Happen Chiel Koster 0-1 47 Open
23 2023-08-02 Dutch Open 2023 Dieren NED 8.19 Johan Op den Dries Chiel Koster 1-0 51 Open
24 2023-08-01 Dutch Open 2023 Dieren NED 7.13 Chiel Koster Tjark Vos 0-1 52 Open
25 2023-07-31 Dutch Open 2023 Dieren NED 6.13 Rick Duijker Chiel Koster 1-0 43 Open
26 2023-07-29 Dutch Open 2023 Dieren NED 5.16 Chiel Koster Jakob Weidemann 1-0 45 Open
27 2023-07-28 Dutch Open 2023 Dieren NED 4.19 Sascha Kurt Chiel Koster 1/2-1/2 24 Open
28 2023-07-27 Dutch Open 2023 Dieren NED 3.12 Chiel Koster Eelke De Boer 0-1 30 Open
29 2023-07-26 Dutch Open 2023 Dieren NED 2.19 William Shakhverdian Chiel Koster 0-1 49 Open
30 2023-07-25 Dutch Open 2023 Dieren NED 1.14 Chiel Koster Nick Maatman 0-1 41 Open
31 2023-05-07 13th WLC Weekender 2023 Eindhoven NED 6.3 Guus Bollen Chiel Koster 1/2-1/2 56 Open
32 2023-05-07 13th WLC Weekender 2023 Eindhoven NED 5.4 Chiel Koster Remco Sprangers 1-0 33 Open
33 2023-05-06 13th WLC Weekender 2023 Eindhoven NED 4.1 Thomas Beerdsen Chiel Koster 1-0 20 Open
34 2023-05-06 13th WLC Weekender 2023 Eindhoven NED 3.2 Chiel Koster Luuk Baselmans 1-0 32 Open
35 2023-05-06 13th WLC Weekender 2023 Eindhoven NED 2.8 Richard Koes Chiel Koster 0-1 27 Open
36 2022-05-15 12th WLC Weekender 2022 Eindhoven NED 6.5 Chiel Koster Sjoerd Van Roon 1/2-1/2 57 Open
37 2022-05-15 12th WLC Weekender 2022 Eindhoven NED 5.1 Leandro Slagboom Chiel Koster 0-1 42 Open
38 2022-05-14 12th WLC Weekender 2022 Eindhoven NED 4.12 Chiel Koster Rob Van Helvoort 1-0 19 Open
39 2022-05-14 12th WLC Weekender 2022 Eindhoven NED 3.12 Niklas van der Valk Chiel Koster 1/2-1/2 67 Open
40 2022-05-14 12th WLC Weekender 2022 Eindhoven NED 2.17 Chiel Koster Jasper Kools 1/2-1/2 26 Open
41 2022-05-13 12th WLC Weekender 2022 Eindhoven NED 1.2 Eline Roebers Chiel Koster 1/2-1/2 61 Open
42 2021-03-21 1st FIDE World Uni RapidC Tornelo INT 9.28 Chiel Koster Shanti Nur Abidah 1-0 27 Open
43 2021-03-21 1st FIDE World Uni RapidC Tornelo INT 8.18 Thanga Manickam M Chiel Koster 1-0 28 Open
44 2021-03-21 1st FIDE World Uni RapidC Tornelo INT 7.25 Chiel Koster Nadezhda Salah 1-0 36 Open
45 2021-03-21 1st FIDE World Uni RapidC Tornelo INT 12.18 Chiel Koster Quentin Burri 0-1 25 Open
46 2021-03-21 1st FIDE World Uni RapidC Tornelo INT 11.23 Unidentified player Chiel Koster 1/2-1/2 44 Open
47 2021-03-21 1st FIDE World Uni RapidC Tornelo INT 10.21 Chiel Koster Unidentified player 1/2-1/2 67 Open
48 2021-03-20 1st FIDE World Uni RapidC Tornelo INT 6.15 Suren Gesyan Chiel Koster 1-0 34 Open
49 2021-03-20 1st FIDE World Uni RapidC Tornelo INT 5.14 Chiel Koster Mukherjee Arpita 1/2-1/2 74 Open
50 2021-03-20 1st FIDE World Uni RapidC Tornelo INT 4.31 35052608 Chiel Koster 0-1 31 Open

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