NetherlandsNED
ID: 1011588

Jan Willem Koelmans

FIDE ratings

1,850Classical
1,822Rapid
1,894Blitz

Performance

50 games
40% Win
36% Draw
24% Loss

Jan Willem Koelmans's playing style

Strong overall score:58%20W 18D 12L over 50 games
Dominates 1.d4 as White:75%in 24 games
Out of form:35%4W 6D 10L in last 20 games
Hard to beat — high draw rate:36%of games are draws

Openings as White

Among the openings shown, Nimzo-Indian Defense: Reshevsky Variation has the largest White sample, with 2 games. Select a row to explore its moves and inspect example games below.

Nimzo-Indian Defense: Reshevsky Variation
100%
2g
Queen's Pawn Game: Colle System
100%
2g
Queen's Gambit Declined: Normal Defense
100%
2g
Nimzo-Indian Defense: Rubinstein System
100%
2g
Indian Defense: Budapest Defense, Adler Variation
100%
2g

Openings as Black

Among the openings shown, Queen's Pawn Game: London System has the largest Black sample, with 2 games. These results describe the available sample, not a prediction of the player’s next choice.

Queen's Pawn Game: London System
100%
2g
Sicilian Defense: Alapin Variation
100%
2g
Queen's Gambit Declined: Cambridge Springs Defense
100%
2g
Sicilian Defense: Closed, Traditional
100%
2g
Sicilian Defense: Najdorf Variation, Lipnitsky Attack
100%
2g

Repertoire

24 games as white in scope
8
7
6
5
4
3
2
a1
b
c
d
e
f
g
h
Move arrowsfrequency, not engine evaluation

Starting position

24 games in this line · White to move

Results for Koelmans, Jan Willem as white · Wins / Draws / Losses

W / D / L
58%
33%
8%
Move
24 · 100%
58%
33%
8%

Game History

(50 games)
DateSourceColorOpponentResultLink
Dec 2, 2025
OTB - LichessBroadcast
Zecha, Oscar(1982)
L—
Dec 2, 2025
OTB - LichessBroadcast
Zecha, Oscar
L—
May 12, 2024
OTB - LichessBroadcast
Elferink, Leon(1827)
D—
May 12, 2024
OTB - LichessBroadcast
Elferink, Leon(1827)
D—
Aug 5, 2023
OTB - TWIC
FMDauner, Benedikt(2377)
L—
Aug 5, 2023
OTB - TWIC
FMDauner, Benedikt(2377)
L—
Jul 30, 2017
OTB - PGNMentor
GMDgebuadze, Alexandre(2524)
L—
Jul 30, 2017
OTB - PGN-Mentor
GMDgebuadze, Alexandre(2524)
L—
Jul 23, 2017
OTB - LumbrasGigaBase
Geboers, Jimmy(1852)
L—
Jul 23, 2017
OTB - LumbrasGigaBase
Geboers, Jimmy(1852)
L—

Research Jan Willem Koelmans’s games and opening repertoire

Jan Willem Koelmans is rated 1850 in standard, 1822 in rapid, 1894 in blitz by FIDE. Jan Willem Koelmans plays for Netherlands.

Jan Willem Koelmans has FIDE ID 1011588.

Check the official FIDE record for ratings and identity. It is not a complete archive of game moves.

Use the openings as White and Black to identify recurring choices in the available games. Follow a branch into the repertoire explorer and inspect example games in the game history. Dates, time controls and sources affect which patterns are relevant to your next match.

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