SV

Siebren Vulker

Rated since May 2025

623 Rapid

RIVALRY

Nemesis
Daalmans Scherpenisse, F. (Faas)
Games: 3 · Win rate: 33%
Kryptonite
Bosma, L. (Lasse)
Games: 4 · Win rate: 0%
Easy Target
Chen, J. (Jason)
Games: 3 · Win rate: 67%

The good & the bad

Best wins
QUARATI, M. (MARINO) 841
12335 GrandPrix Alphen Groep A · Saturday 29 November 2025
DAALMANS SCHERPENISSE, F. (FAAS) 682
13342 JCC-E Leidse Schaakbond Ronde 123 · Saturday 21 March 2026
SOSEF, A.J. (AIDEN) 636
11673 GrandPrix Philidor Leiden Groep A · Saturday 3 January 2026
ALTINISIK, I. (INCI) 617
12773 PK-E van de Leidse Schaakbond Groep B · Sunday 11 January 2026
GOMES, B. (BENJAMIN-DEAN) 613
11678 GrandPrix LSG Groep A · Saturday 6 June 2026
Worst losses
CHEN, J. (JASON) 420
12773 PK-E van de Leidse Schaakbond Groep B · Sunday 11 January 2026
LI, B. (BINHAO) 470
12773 PK-E van de Leidse Schaakbond Groep B · Sunday 11 January 2026
GUPTA, K. (KAVISH) 478
9312 GrandPrix Philidor Leiden Groep A · Saturday 4 January 2025
NOOM, D. (DAVID) 502
11673 GrandPrix Philidor Leiden Groep A · Saturday 3 January 2026
BOUMAN, T. (THIJMEN) 505
11674 GrandPrix De Vrijpionnen Voorhout Groep A · Saturday 14 February 2026
No FIDE-rated tournaments found.
GrandPrix LSG Groep A Saturday 6 June 2026 +4–1=1 +52.8
JCC-E Leidse Schaakbond Ronde 456 Saturday 21 March 2026 +0–3=0 -20.5
JCC-E Leidse Schaakbond Ronde 123 Saturday 21 March 2026 +1–2=0 +12.4
GrandPrix Leiderdorp Groep A Sunday 15 March 2026 +0–5=1 -55.1
GrandPrix De Vrijpionnen Voorhout Groep A Saturday 14 February 2026 +2–5=0 -5.9
PK-E van de Leidse Schaakbond Groep B Sunday 11 January 2026 +4–3=0 -19.5
GrandPrix Philidor Leiden Groep A Saturday 3 January 2026 +2–4=1 -4.7
GrandPrix Alphen Groep A Saturday 29 November 2025 +4–2=1 +58.9
GrandPrix Op Eigen Wieken Groep A Saturday 18 October 2025 +3–3=1 +61.9
GrandPrix SV Voorschoten Groep A Sunday 21 September 2025 +1–6=0 -124.6
GrandPrix AAS Groep A Saturday 12 April 2025 +2–2=1 -130.2
GrandPrix SV Voorschoten Groep A Sunday 23 March 2025 +5–1=1 +177.5
GrandPrix de Vrijpionnen Voorhout Groep A Saturday 1 March 2025 +2–2=2 +74.0
GrandPrix Philidor Leiden Groep A Saturday 4 January 2025 +2–4=1 -199.0

Rating History

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Peak Ratings

Rapid 623 July 1, 2026

Games

Wins 32
Losses 43
Draws 10
Win Rate 38%

Performance by Color

Color Wins Draws Losses Win Rate
White 12 3 27 29%
Black 20 7 16 47%

Recent Matches

Ruiter, T. (Tobias) (468) Saturday 6 June 2026 WIN +15.0
Pajak, L. (Leon) (561) Saturday 6 June 2026 DRAW +0.1
Reitsema, W. (Wout) (549) Saturday 6 June 2026 LOSS -20.6
Suarez, L. (Lucas) (539) Saturday 6 June 2026 WIN +18.8
Geelen, L. (Lucas) (499) Saturday 6 June 2026 WIN +16.6
Gomes, B. (Benjamin-Dean) (613) Saturday 6 June 2026 WIN +22.9
Bosma, L. (Lasse) (949) Saturday 21 March 2026 LOSS -4.3
Mu, S. (Stephen) (827) Saturday 21 March 2026 LOSS -8.3
Daalmans Scherpenisse, F. (Faas) (835) Saturday 21 March 2026 LOSS -7.9
Bosma, L. (Lasse) (949) Saturday 21 March 2026 LOSS -4.3
Mu, S. (Stephen) (827) Saturday 21 March 2026 LOSS -8.3
Daalmans Scherpenisse, F. (Faas) (682) Saturday 21 March 2026 WIN +24.9
Berg van den, S.J. (Sylven) (572) Sunday 15 March 2026 LOSS -21.2
Zaaijer, B. (Bas) (909) Sunday 15 March 2026 LOSS -5.4
Dijk van, T. (Timo) (614) Sunday 15 March 2026 LOSS -18.8
Mcqueary-Ennis, E. (Evan) (1036) Sunday 15 March 2026 LOSS -2.4
Hulst van der, B. (Bram) (935) Sunday 15 March 2026 DRAW +15.4
Beijers, E.L.O. (Eskil) (544) Sunday 15 March 2026 LOSS -22.7
Bouman, T. (Thijmen) (505) Saturday 14 February 2026 LOSS -24.6
Jagt van der, L. (Levi) (789) Saturday 14 February 2026 LOSS -9.7