KNSB FIDE
JK

Jan Willem Koelmans

Rated since January 2023

1881 Classic
1819 Rapid
1855 Blitz

RIVALRY

Not enough games to determine rivalries yet.

The good & the bad

Best wins
GUILLAUMOND, M. (MATTHIEU) 2111
13892 17e Kattenburger Open Toernooi KO17 ronde 7 · Sunday 31 May 2026
NIES, L.W. (LEVI) 2028
12698 Chessfestival Groningen Open B · Monday 22 December 2025
HEIKAMP, H. (HENDRIK) 2011
12698 Chessfestival Groningen Open B · Sunday 21 December 2025
NGANGBAM, C. (CHINGTHANG) 1946
13748 Amsterdam Chess Festival 2026 + NK Studenten Klassiek Groep B · Sunday 19 July 2026
SEDLACEK, JIRI 1937
SUMMER PRAGUE OPEN 2026 - B - FIDE open · Wednesday 12 August 2026
Worst losses
PUTTEN VAN, G. (GUUS) 1728
12984 33e Open Haags rapidkampioenschap Groep A · Saturday 4 April 2026
POL VAN DE, H.M. (HANS) 1732
12450 Kennemer Open 2025-2026 Kennemer Open 2025-2026 Ronde 3 en 4 · Saturday 22 November 2025
KLEIN, L.J. (LEEN) 1742
10470 Tata Steel Chess Tournament 2026 Tienkampen · Wednesday 28 January 2026
SCHWENKE, STEFAN 1850
12698 Chessfestival Groningen Open B · Sunday 28 December 2025
ZEMAN, JONAS 1853
SUMMER PRAGUE OPEN 2026 - B - FIDE open · Friday 14 August 2026
SUMMER PRAGUE OPEN 2026 - B - FIDE open Friday 7 August 2026 +5–1=3 +12.8
Amsterdam Chess Festival 2026 + NK Studenten Klassiek Groep B Saturday 11 July 2026 +3–1=4 +47.7
HSG Open 2026 Groep B Friday 19 June 2026 +0–2=3 -20.7
18de BPB Limburg Open 2026 Groep C Friday 22 May 2026 +2–0=5 -5.9
51e Open Kampioenschap van Utrecht Groep C Friday 15 May 2026 +1–0=3 +0.8
DD Rapid Open Groep A Saturday 2 May 2026 +3–2=2 -1.6
85e Daniel Noteboomtoernooi 4 kampen Friday 20 February 2026 +1–0=2 +10.9
DD Den Haag Open Schaakkampioenschap 2026 Rondes 3-7 Thursday 12 February 2026 +2–1=1 +8.6
DD Den Haag Open Schaakkampioenschap 2026 Rondes 1-2 Thursday 12 February 2026 +0–1=0 -3.8
Tata Steel Chess Tournament 2026 Tienkampen Friday 16 January 2026 +2–1=6 +12.0
2026 Chess.com Botwinnik Open Vierkampen Friday 2 January 2026 +1–0=2 +15.1
Chessfestival Groningen Open B Sunday 21 December 2025 +2–5=1 +6.3
Kennemer Open 2026-2027 Kennemer Open 2026-2027 Ronde 1 Saturday 19 September 2026 +1–0=0 +7.7
Persoonlijk Kampioenschap RSB/RSB Open 2026 Groep B Ronde 1-6 Monday 17 August 2026 +1–0=4 -10.5
11e SHTV open kampioenschap Groep A Thursday 4 June 2026 +2–2=1 -14.0
Erasmus Watertorentoernooi Ronde 7 Monday 11 May 2026 +0–0=1 -0.3
Erasmus Watertorentoernooi Ronde 3 t/m/ 6 Monday 11 May 2026 +1–1=2 -12.3
Erasmus Watertorentoernooi Ronde 1 t/m/ 2 Monday 11 May 2026 +0–0=1 -8.1
33e Open Haags rapidkampioenschap Groep A Saturday 4 April 2026 +2–3=1 -13.9
13e Best of the West Groep A, ronde 7 Saturday 18 October 2025 +0–0=1 +0.6
13e Best of the West Groep A, Ronde 6 Saturday 18 October 2025 +0–0=1 -0.3
13e Best of the West Groep A, ronde 5 Saturday 18 October 2025 +0–0=1 +3.1
13e Best of the West Groep A, ronde 4 Saturday 18 October 2025 +0–0=1 +3.8
13e Best of the West Groep A, ronde 2 Saturday 18 October 2025 +0–0=1 +5.8
17e Kattenburger Open Toernooi KO17 ronde 7 Sunday 12 October 2025 +1–0=0 +20.2
17e Kattenburger Open Toernooi 17e Kattenburger Open Ronde 5 Sunday 12 October 2025 +0–0=1 +5.3
17e Kattenburger Open Toernooi 17e Kattenburger Open Ronde 4 Sunday 12 October 2025 +1–0=0 +14.7
17e Kattenburger Open Toernooi Ronde 3 Sunday 12 October 2025 +0–0=1 +1.5
Kennemer Open 2025-2026 Kennemer Open 2025-2026 Ronde 8 en 9 Saturday 20 September 2025 +1–0=1 +17.0
Kennemer Open 2025-2026 Kennemer Open 2025-2026 Ronde 7 Saturday 20 September 2025 +1–0=0 +9.6
Kennemer Open 2025-2026 Kennemer Open 2025-2026 Ronde 6 Saturday 20 September 2025 +1–0=0 +8.4
Kennemer Open 2025-2026 Kennemer Open 2025-2026 Ronde 5 Saturday 20 September 2025 +0–0=1 +3.8
Kennemer Open 2025-2026 Kennemer Open 2025-2026 Ronde 3 en 4 Saturday 20 September 2025 +0–2=0 -20.3
HSB competitie 2025-2026 April2026 Monday 1 September 2025 +0–1=0 -12.5
HSB competitie 2025-2026 CompMrt2026 Monday 1 September 2025 +0–0=1 -3.1
HSB competitie 2025-2026 HSBCompetitieFeb26 Monday 1 September 2025 +0–0=1 -3.0
HSB competitie 2025-2026 DecemberJanuari Comp 2526 Monday 1 September 2025 +0–0=1 +0.5
16e Kattenburger Open Toernooi Groep A Monday 1 September 2025 +0–0=1 +6.2

Team Competition

Current team
DD 4
2e klasse B · 2025-2026 · 7 games
Past teams
DD 2
1e klasse B · 2024-2025
DD 2
klasse 1B · 2023-2024
DD 2
Klasse 4F · 2022-2023

Rating History

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Peak Ratings

Classic 1897 May 1, 2024
Rapid 1886 Dec. 1, 2024
Blitz 1855 May 1, 2026

Games

Wins 34
Losses 23
Draws 55
Win Rate 30%

Performance by Color

Color Wins Draws Losses Win Rate
White 14 32 10 25%
Black 20 23 13 36%

Recent Matches

Dings, V. (Vincent) (1718) Saturday 19 September 2026 WIN +7.7
Eveleens, E. (Ed) (1805) Wednesday 26 August 2026 DRAW -2.3
Kuin, A.J. (Arjen) (1770) Monday 24 August 2026 DRAW -3.4
Hoek van Dijke, J. (Jan) (1830) Saturday 22 August 2026 DRAW -1.4
Kruithof, G. (Glenn) (1327) Friday 21 August 2026 WIN +0.7
Roshania, J. (Jimmy) (1748) Wednesday 19 August 2026 DRAW -4.1
Wilkens, M. (Mees) (1878) Saturday 15 August 2026 WIN +12.8
Zeman, Jonas (1853) Friday 14 August 2026 LOSS -13.1
Barbsys, Skirmantas (1830) Thursday 13 August 2026 DRAW -1.4
Sedlacek, Jiri (1937) Wednesday 12 August 2026 WIN +14.8
Sochor, Adam (1690) Tuesday 11 August 2026 WIN +6.6
Jandecka, Miroslav (1612) Monday 10 August 2026 WIN +4.6
Cejchan, Teodor (1629) Sunday 9 August 2026 DRAW -7.5
Levinsky, Ladislav (1637) Saturday 8 August 2026 DRAW -7.3
Baraniuk, Andrej (1551) Friday 7 August 2026 WIN +3.3
Ngangbam, C. (Chingthang) (1946) Sunday 19 July 2026 WIN +16.2
Kok, L.H.F. (Lennart) (1906) Saturday 18 July 2026 WIN +14.9
Beliën, R. (Roan) (1911) Friday 17 July 2026 DRAW +2.6
Lankveld van, K.J.A. (Koen) (1826) Thursday 16 July 2026 DRAW -0.4
Cordes, J.J. (Jule) (1975) Wednesday 15 July 2026 LOSS -7.9