KNSB FIDE
JK

Jaap de Koster

Rated since April 2023

1845 Classic
1815 Rapid
1845 Blitz

RIVALRY

Not enough games to determine rivalries yet.

The good & the bad

Best wins
VERSTEGE, V. (VINCENT) 1861
10471 Tata Steel Chess Tournament 2026 Weekendvierkampem · Saturday 17 January 2026
DOBBER, G. (BERT) 1783
12594 KNSB competitie 2025-2026 Klasse 5 ronde 4 · Saturday 13 December 2025
BOVENKERK, S.L.P. (SASCHA) 1750
12005 Groene Hart Jeugd Cup 2025-2026 Speelavond 7 · Friday 10 April 2026
WEBER, B. (BAS) 1725
13315 KNSB competitie 2025-2026 Klasse 5 ronde 5 · Saturday 28 March 2026
MAHOOK, L.M. (LAITH) 1675
12001 Groene Hart Jeugd Cup 2025-2026 Speelavond 3 · Friday 12 December 2025
Worst losses
OOSTHOEK, R.A.H. (RICO) 1548
12000 Groene Hart Jeugd Cup 2025-2026 Speelavond 2 · Friday 21 November 2025
HEUVEL VAN DEN, T. (THIJMEN) 1612
12003 Groene Hart Jeugd Cup 2025-2026 Speelavond 5 · Friday 6 March 2026
EHRHARDT, M. (MATTHIAS) 1826
13248 KNSB competitie 2025-2026 Klasse 5 ronde 7 · Saturday 7 March 2026
VERBAAN, B.M. (BART) 1912
13138 HSB competitie 2025-2026 HSBCompetitieFeb26 · Thursday 12 February 2026
Tata Steel Chess Tournament 2026 Weekendvierkampem Friday 16 January 2026 +1–0=2 +16.9
Groene Hart Jeugd Cup 2025-2026 Speelavond 7 Friday 3 October 2025 +2–0=1 +20.3
Groene Hart Jeugd Cup 2025-2026 Speelavond 5 Friday 3 October 2025 +2–1=0 -9.4
Groene Hart Jeugd Cup 2025-2026 Speelavond 4 Friday 3 October 2025 +3–0=0 +33.8
Groene Hart Jeugd Cup 2025-2026 Speelavond 3 Friday 3 October 2025 +1–0=2 +8.5
Groene Hart Jeugd Cup 2025-2026 Speelavond 2 Friday 3 October 2025 +2–1=0 -13.5
KNSB competitie 2025-2026 Klasse 5 ronde 5 Saturday 20 September 2025 +1–0=0 +13.0
KNSB competitie 2025-2026 Klasse 5 ronde 7 Saturday 20 September 2025 +0–1=0 -21.6
KNSB competitie 2025-2026 Klasse 5 ronde 4 Saturday 20 September 2025 +1–0=0 +17.0
KNSB competitie 2025-2026 Klasse 5 Ronde 3 Saturday 20 September 2025 +0–0=1 -0.2
HSB competitie 2025-2026 HSBCompetitieFeb26 Monday 1 September 2025 +0–1=0 -17.8

Rating History

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Peak Ratings

Classic 1872 Feb. 1, 2026
Rapid 1815 May 1, 2026
Blitz 1854 March 1, 2026

Games

Wins 13
Losses 4
Draws 6
Win Rate 57%

Performance by Color

Color Wins Draws Losses Win Rate
White 6 3 1 60%
Black 7 3 3 54%

Recent Matches

Oosthoek, R.A.H. (Rico) (1681) Friday 10 April 2026 DRAW -6.2
Bovenkerk, S.L.P. (Sascha) (1750) Friday 10 April 2026 WIN +17.5
Chi, J.J.W. (Jason) (1579) Friday 10 April 2026 WIN +9.0
Weber, B. (Bas) (1725) Saturday 28 March 2026 WIN +13.0
Ehrhardt, M. (Matthias) (1826) Saturday 7 March 2026 LOSS -21.6
Chi, J.J.W. (Jason) (1572) Friday 6 March 2026 WIN +8.3
Benedetti, A. (Angelo) (1658) Friday 6 March 2026 WIN +12.2
Heuvel van den, T. (Thijmen) (1612) Friday 6 March 2026 LOSS -30.0
Verbaan, B.M. (Bart) (1912) Thursday 12 February 2026 LOSS -17.8
Zhang, M. (Muchen Peter) (1585) Friday 6 February 2026 WIN +10.4
Ozbakan, B. (Burak) (1662) Friday 6 February 2026 WIN +14.1
Koval, B. (Bohdan) (1561) Friday 6 February 2026 WIN +9.3
Weidema, L. (Luuk) (1832) Sunday 18 January 2026 DRAW -1.3
Verstege, V. (Vincent) (1861) Saturday 17 January 2026 WIN +20.3
Sinnige, H. (Hans) (1817) Friday 16 January 2026 DRAW -2.1
Dobber, G. (Bert) (1783) Saturday 13 December 2025 WIN +17.0
Hamers, H. (Hidde) (1520) Friday 12 December 2025 DRAW -12.1
Londhe, S. (Svar) (1859) Friday 12 December 2025 DRAW +5.3
Mahook, L.M. (Laith) (1675) Friday 12 December 2025 WIN +15.2
Hubner, W.J.P. (Werner) (1834) Saturday 22 November 2025 DRAW -0.2