KNSB FIDE
RK

Ramon Koster

Rated since January 2023

2300 Classic
2341 Rapid
2416 Blitz

RIVALRY

Nemesis
Breukelman, H.J. (Jan)
Games: 4 · Win rate: 75%
Kryptonite
Winter de, A. (Arthur)
Games: 5 · Win rate: 0%

The good & the bad

Best wins
DELFT VAN, M. (MERIJN) (IM) 2381
NK-Snelschaken 2024 · Saturday 14 September 2024
BREUKELMAN, H.J. (JAN) (FM) 2380
12006 NK Snelschaak voor clubteams Groep A · Sunday 29 March 2026
LOPEZ, J.J. (JASEL JUSTO) (IM) 2368
9488 38ste Open Schaakkampioenschap van Spijkenisse Groep 1 · Saturday 30 November 2024
ELGERSMA, O.J. (ONNO) (FM) 2332
NK-Snelschaken 2024 · Saturday 14 September 2024
VEDDER, H.R. (HENK) (IM) 2323
12587 Fish 'n Food rapidtoernooi Groep A · Saturday 18 April 2026
Worst losses
JANSEN, M. (MARIJN) 1868
NK-Snelschaken 2024 · Saturday 14 September 2024
MINDE, TIMOTHE 1880
Djerba International Chess Festival 2026 Blitz · Wednesday 11 February 2026
MAES, D.R. (DJAD) 1933
9488 38ste Open Schaakkampioenschap van Spijkenisse Groep 1 · Saturday 30 November 2024
KERKMEESTER, C.S. (CEDRIC) 1945
NK-Snelschaken 2024 · Saturday 14 September 2024
MOLENDIJK, P.B. (PIETER) 1952
NK-Snelschaken 2024 · Saturday 14 September 2024
NK Snelschaak voor clubteams Groep A Sunday 29 March 2026 +17–2=3 +246.9
Djerba International Chess Festival 2026 Blitz Wednesday 11 February 2026 +5–4=0 -77.7
Djerba International Chess Festival 2026 Open A Saturday 7 February 2026 +5–2=2 +9.6
Chessfestival Groningen Open A Sunday 21 December 2025 +4–2=3 +17.0
XTX Markets London Chess Classic Open Wednesday 26 November 2025 +4–4=1 -21.5
UniClass Science Park Amsterdam Schaaktoernooi Groep A Saturday 5 July 2025 +4–0=5 +51.7
HSG Open 2025 Groep A Friday 20 June 2025 +3–1=1 -1.2
Tata Steel Chess Tournament 2025 Tienkampen Friday 17 January 2025 +0–2=0 -53.1
Chess Festival Groningen Open A Saturday 21 December 2024 +4–2=3 +6.7
NK-Snelschaken 2024 Saturday 14 September 2024 +15–6=5 -107.4
Fish 'n Food rapidtoernooi Groep A Saturday 18 April 2026 +3–3=1 -55.9
Rapid Schaaktoernooi Giessenburg Groep A Saturday 25 October 2025 +6–0=1 +68.6
KNSB competitie 2025-2026 Klasse 1 ronde 9 Saturday 20 September 2025 +0–1=0 -8.0
KNSB competitie 2025-2026 Klasse 1 ronde 6 Saturday 20 September 2025 +1–0=0 +2.2
KNSB competitie 2025-2026 KNSB Beker ronde 4 Saturday 20 September 2025 +0–0=1 -2.3
KNSB competitie 2025-2026 Klasse 1 ronde 8 Saturday 20 September 2025 +0–0=1 -2.4
KNSB competitie 2025-2026 Klasse 1 ronde 7 Saturday 20 September 2025 +2–0=0 +11.0
KNSB competitie 2025-2026 Klasse 1 ronde 5 Saturday 20 September 2025 +0–0=1 -2.6
KNSB competitie 2025-2026 Klasse 1 Ronde 4 Saturday 20 September 2025 +1–0=0 +8.1
KNSB competitie 2025-2026 Klasse 1 ronde 3 Saturday 20 September 2025 +0–0=1 +0.9
KNSB competitie 2025-2026 Klasse 1 ronde 2 Saturday 20 September 2025 +0–1=0 -20.3
KNSB competitie 2025-2026 Klasse 1 ronde 1 Saturday 20 September 2025 +0–0=1 -1.5
Maia Chess Open 2025 - Maia Masters Friday 22 August 2025 +4–3=2 -35.6
38ste Open Schaakkampioenschap van Spijkenisse Groep 1 Saturday 30 November 2024 +4–2=1 -14.4
KNSB competitie 2024-2025 Klasse 1 ronde 9 Saturday 21 September 2024 +0–0=1 -8.7
KNSB competitie 2024-2025 Klasse 1 ronde 8 Saturday 21 September 2024 +0–0=1 -3.8
KNSB competitie 2024-2025 Klasse 1 ronde 7 Saturday 21 September 2024 +0–0=1 +0.4
KNSB competitie 2024-2025 Klasse 1 ronde 6 Saturday 21 September 2024 +1–0=0 +11.3
KNSB competitie 2024-2025 Klasse 1 ronde 5 Saturday 21 September 2024 +0–0=1 +6.3
KNSB competitie 2024-2025 Klasse 1 ronde 4 Saturday 21 September 2024 +1–0=0 +26.8
KNSB competitie 2024-2025 Klasse 1 ronde 3 Saturday 21 September 2024 +0–0=1 +0.7
KNSB competitie 2024-2025 Klasse 1 ronde 2 Saturday 21 September 2024 +0–0=1 -8.6
KNSB competitie 2024-2025 Klasse 1 ronde 1 Saturday 21 September 2024 +1–0=0 +7.8
KNSB competitie 2023-2024 Klasse 1 ronde 9 Saturday 16 September 2023 +0–0=1 +10.5
KNSB competitie 2023-2024 Klasse 1 ronde 8 Saturday 16 September 2023 +1–0=0 +23.6
KNSB competitie 2023-2024 Klasse 1 ronde 7 Saturday 16 September 2023 +0–0=1 -9.1

Rating History

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Peak Ratings

Classic 2355 Feb. 1, 2025
Rapid 2397 Dec. 1, 2025
Blitz 2416 April 1, 2026

Games

Wins 86
Losses 35
Draws 41
Win Rate 53%

Performance by Color

Color Wins Draws Losses Win Rate
White 47 25 15 54%
Black 39 16 20 52%

Recent Matches

IM Vedder, H.R. (Henk) (2323) Saturday 18 April 2026 WIN +15.4
IM Grutter, T.J. (Tim) (2391) Saturday 18 April 2026 LOSS -19.7
Schilstra, L. (Laurens) (2211) Saturday 18 April 2026 LOSS -28.8
Graaf de, D. (Dick) (2146) Saturday 18 April 2026 DRAW -12.0
Darie, A.C. (Aden) (2234) Saturday 18 April 2026 LOSS -27.8
FM Duijn, R. (Rob) (2145) Saturday 18 April 2026 WIN +7.3
Zhang, X. (Xiheng) (2203) Saturday 18 April 2026 WIN +9.6
FM Pel, B. (Bonno) (2276) Saturday 11 April 2026 LOSS -8.0
FM Breukelman, H.J. (Jan) (2380) Sunday 29 March 2026 WIN +23.5
FM Labruyère, R. (Roger) (2293) Sunday 29 March 2026 WIN +19.5
IM Winter de, A. (Arthur) (2511) Sunday 29 March 2026 DRAW +11.2
IM Winter de, A. (Arthur) (2511) Sunday 29 March 2026 DRAW +11.2
FM Breukelman, H.J. (Jan) (2380) Sunday 29 March 2026 WIN +23.5
IM Winter de, A. (Arthur) (2511) Sunday 29 March 2026 LOSS -6.2
FM Labruyère, R. (Roger) (2293) Sunday 29 March 2026 WIN +19.5
FM Bruil, R.A. (Rembrandt) (2318) Sunday 29 March 2026 WIN +20.7
IM Winter de, A. (Arthur) (2511) Sunday 29 March 2026 LOSS -6.2
FM Bruil, R.A. (Rembrandt) (2318) Sunday 29 March 2026 WIN +20.7
Smeets, B. (Bent) (1880) Sunday 29 March 2026 WIN +3.4
FM Mazajchik, T. (Tim) (2257) Sunday 29 March 2026 WIN +17.8