KNSB FIDE
JK

Jaap Koster

Rated since January 2023

1765 Classic
1775 Rapid
1775 Blitz

RIVALRY

Nemesis
Norden, M.J. (Marc)
Games: 3 · Win rate: 0%

The good & the bad

Best wins
SONDER, A.J.A. (PETER) 1986
7604 SOS Competitie 2023/2024 Oktober 2023 · Monday 2 October 2023
POL VAN, L. (LODEWIJK) 1745
7606 SOS Competitie 2023/2024 December 2023 · Monday 27 November 2023
PLOEM, R.W. (ROBERT) 1685
7030 SOS Competitie 2022/2023 April 2023(K3) · Monday 3 April 2023
TOBAR, M. (MICHEL) 1677
7028 SOS Competitie 2022/2023 April 2023(K1) · Friday 14 April 2023
ONWEZEN, E. (ERIC) 1638
6846 SOS Competitie 2022/2023 Maart 2023(K3) · Friday 17 March 2023
Worst losses
MATTHEE, S.P. (BAS) 1374
12774 SOS competitie 2025/2026 Lijst 1 feb · Monday 12 January 2026
WEIDEMA, R. (RIK) 1814
9654 SOS Competitie 2024/2025 2025-05 · Monday 12 May 2025
ALBERTS, G.G. (GUUS) 1825
12775 SOS competitie 2025/2026 Lijst 1 mrt · Monday 2 February 2026
NORDEN, M.J. (MARC) 1834
9653 SOS Competitie 2024/2025 2025-04 · Monday 7 April 2025
FLOHR, M.R. (MARCEL) 1858
12777 SOS competitie 2025/2026 Lijst 1 mei · Monday 13 April 2026
No FIDE-rated tournaments found.
SOS competitie 2025/2026 Lijst 1 mei Monday 1 September 2025 +0–1=0 -9.6
SOS competitie 2025/2026 Lijst 1 apr Monday 1 September 2025 +0–2=0 -17.8
SOS competitie 2025/2026 Lijst 1 mrt Monday 1 September 2025 +0–1=0 -11.5
SOS competitie 2025/2026 Lijst 1 feb Monday 1 September 2025 +0–1=0 -23.5
SOS competitie 2025/2026 Lijst 1 Dec Monday 1 September 2025 +0–0=1 -0.7
SOS competitie 2025/2026 Lijst 1 Nov Monday 1 September 2025 +0–0=1 +1.8
SOS Competitie 2024/2025 2025-05 Sunday 1 September 2024 +0–1=0 -13.1
SOS Competitie 2024/2025 2025-04 Sunday 1 September 2024 +0–1=0 -12.9
SOS Competitie 2024/2025 2025-03 Sunday 1 September 2024 +0–0=1
SOS Competitie 2024/2025 2025-02 Sunday 1 September 2024 +0–0=1 -2.5
SOS Competitie 2024/2025 2024-11 Sunday 1 September 2024 +0–0=1 -7.7
SOS Competitie 2024/2025 2024-10 Sunday 1 September 2024 +0–0=1 -1.1
SOS Competitie 2023/2024 Mei 2024 Friday 1 September 2023 +0–1=0 -8.8
SOS Competitie 2023/2024 April 2024 Friday 1 September 2023 +0–0=1 -2.3
SOS Competitie 2023/2024 Februari 2024 Friday 1 September 2023 +0–0=1 -10.7
SOS Competitie 2023/2024 December 2023 Friday 1 September 2023 +1–0=0 +11.1
SOS Competitie 2023/2024 November 2023 Friday 1 September 2023 +0–1=0 -8.2
SOS Competitie 2023/2024 Oktober 2023 Friday 1 September 2023 +1–0=0 +19.5
SOS Competitie 2023/2024 September 2023 Friday 1 September 2023 +1–0=0 +3.7
SOS Competitie 2022/2023 Mei Monday 12 September 2022 +1–0=0 +5.9
SOS Competitie 2022/2023 April 2023(K1) Monday 12 September 2022 +1–0=0 +10.5
SOS Competitie 2022/2023 April 2023(K3) Monday 12 September 2022 +1–0=0 +10.8
SOS Competitie 2022/2023 Maart 2023(K3) Monday 12 September 2022 +1–0=0 +9.5
SOS Competitie 2022/2023 Februari 2023 Monday 12 September 2022 +1–0=0 +3.2

Rating History

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Peak Ratings

Classic 1866 March 1, 2024
Rapid 1784 March 1, 2026
Blitz 1784 March 1, 2026

Games

Wins 8
Losses 9
Draws 8
Win Rate 32%

Performance by Color

Color Wins Draws Losses Win Rate
White 5 2 4 45%
Black 3 6 5 21%

Recent Matches

Flohr, M.R. (Marcel) (1858) Monday 13 April 2026 LOSS -9.6
Norden, M.J. (Marc) (1890) Friday 6 March 2026 LOSS -8.9
Norden, M.J. (Marc) (1890) Friday 6 March 2026 LOSS -8.9
Alberts, G.G. (Guus) (1825) Monday 2 February 2026 LOSS -11.5
Matthee, S.P. (Bas) (1374) Monday 12 January 2026 LOSS -23.5
Heek, J. (Joram) (1781) Monday 3 November 2025 DRAW -0.7
Braun, S.C. (Steven) (1871) Wednesday 15 October 2025 DRAW +1.8
Weidema, R. (Rik) (1814) Monday 12 May 2025 LOSS -13.1
Norden, M.J. (Marc) (1834) Monday 7 April 2025 LOSS -12.9
Leeuwen van, I.B. (Ivo) Tuesday 11 March 2025 DRAW
Koot, G.C.A. (Jory) (1774) Monday 3 February 2025 DRAW -2.5
Munster van, F.G. (Erik) (1607) Monday 4 November 2024 DRAW -7.7
Florijn, S. (Stefan) (1823) Monday 16 September 2024 DRAW -1.1
Gouw, C.P.T.H. (Carol-Peter) (1972) Monday 13 May 2024 LOSS -8.8
Florijn, S. (Stefan) (1801) Monday 25 March 2024 DRAW -2.3
Weerdenburg, H. (Hans) (1374) Monday 5 February 2024 DRAW -10.7
Pol van, L. (Lodewijk) (1745) Monday 27 November 2023 WIN +11.1
Bilt van der, W. (Wouter) (1892) Monday 30 October 2023 LOSS -8.2
Sonder, A.J.A. (Peter) (1986) Monday 2 October 2023 WIN +19.5
Linden van der, A.L. (Ton) (1463) Monday 11 September 2023 WIN +3.7