KNSB FIDE
KS

Klaas Siewertsen

Rated since January 2023

1517 Rapid

RIVALRY

Not enough games to determine rivalries yet.

The good & the bad

Best wins
FLIKWEERT, C. (CEES) 1719
13978 SGA Rapidcompetitie 2026 4e Klasse voorronde · Wednesday 20 May 2026
KOOLSTRA, J.R. (JAN) 1607
13647 SGA Competitie 2025-2026 Viertallen ronde 6 en 7 · Monday 30 March 2026
BAJNATH, A. (AMRESH) 1436
13749 Amsterdam Chess Festival 2026 + NK Studenten Klassiek Groep C · Friday 17 July 2026
GOOIJERS, R. (RICHARD) 1369
13749 Amsterdam Chess Festival 2026 + NK Studenten Klassiek Groep C · Sunday 19 July 2026
JANSWEIJER, M. (MAARTEN) 1200
11616 UniClass Science Park Amsterdam Schaaktoernooi Groep C · Friday 11 July 2025
Worst losses
BOORDER DE, M. (MARK) 1425
11357 SGA Competitie 2024-2025 Viertallen ronde 8 en 9 · Monday 12 May 2025
GULAVE, D. (DEVRAN) 1460
11647 De Volewijckers Weekendvierkamp 2025 Groep 11 · Saturday 5 July 2025
LOVISOTTO, K. (KEVIN) 1490
12486 SGA Competitie 2025-2026 Bronzen Beker ronde 1 · Tuesday 11 November 2025
TULENBAYEVA, ALIIYA 1538
13749 Amsterdam Chess Festival 2026 + NK Studenten Klassiek Groep C · Monday 13 July 2026
LAGRAND, T.H.M. (DICK) 1573
11647 De Volewijckers Weekendvierkamp 2025 Groep 11 · Saturday 5 July 2025
Amsterdam Chess Festival 2026 + NK Studenten Klassiek Groep C Saturday 11 July 2026 +4–5=0 -17.6
UniClass Science Park Amsterdam Schaaktoernooi Groep C Saturday 5 July 2025 +2–3=3 -7.1
Het Volewijckers weekend-vierkamp Groep K Friday 3 July 2026 +0–2=1 -13.7
SGA Rapidcompetitie 2026 4e Klasse voorronde Monday 18 May 2026 +1–2=0 +2.0
SGA Competitie 2025-2026 Viertallen ronde 7 Wednesday 1 October 2025 +0–1=0 -4.3
SGA Competitie 2025-2026 Viertallen ronde 6 en 7 Wednesday 1 October 2025 +1–0=0 +16.1
SGA Competitie 2025-2026 Viertallen ronde 4 en 5 Wednesday 1 October 2025 +0–1=1 -7.6
SGA Competitie 2025-2026 Viertallen ronde 3 Wednesday 1 October 2025 +0–0=1 +4.0
SGA Competitie 2025-2026 Bronzen Beker ronde 1 Wednesday 1 October 2025 +0–1=0 -13.6
SGA Competitie 2025-2026 Viertallen ronde 1 en 2 Wednesday 1 October 2025 +0–0=1 +7.4
De Volewijckers Weekendvierkamp 2025 Groep 11 Friday 4 July 2025 +0–3=0 -27.2
SGA Competitie 2024-2025 Viertallen ronde 8 en 9 Monday 30 September 2024 +0–1=0 -17.2

Team Competition

Current teams
WSC
Bronzen Beker · 2025-2026 · 1 game
WSC 1
Viertallen · 2025-2026 · 6 games
Past teams
WSC 1
Viertallen · 2024-2025
WSC 1
Viertallen · 2023-2024

Rating History

Loading rating history...

Peak Ratings

Classic 1638 April 1, 2024
Rapid 1517 July 1, 2026
Blitz 1503 March 1, 2026

Games

Wins 8
Losses 19
Draws 7
Win Rate 24%

Performance by Color

Color Wins Draws Losses Win Rate
White 4 3 9 25%
Black 4 4 10 22%

Recent Matches

Gooijers, R. (Richard) (1369) Sunday 19 July 2026 WIN +7.6
Peper, J.P.C. (Jeroen) (1848) Saturday 18 July 2026 LOSS -3.1
Bajnath, A. (Amresh) (1436) Friday 17 July 2026 WIN +9.8
Kaptein, P.L.W.M. (Peter) (1594) Thursday 16 July 2026 LOSS -9.8
Mangold, L. (Lucas) Wednesday 15 July 2026 WIN
Mesbih, N. (Nael) Tuesday 14 July 2026 WIN
Tulenbayeva, Aliiya (1538) Monday 13 July 2026 LOSS -11.7
Pelt, J.A. (Hans) (1726) Sunday 12 July 2026 LOSS -5.8
Gaalen van, J.M. (Jakob) (1766) Saturday 11 July 2026 LOSS -4.8
Bhutani, G. (Granth) (1603) Saturday 4 July 2026 LOSS -4.7
Melchers, B.J. (Bert-Jan) (1523) Saturday 4 July 2026 DRAW +0.3
Bergshoeff, G. (Bert) (1611) Friday 3 July 2026 LOSS -9.2
Flikweert, C. (Cees) (1719) Wednesday 20 May 2026 WIN +19.0
Knoester, N.P.C. (Klaas) (1657) Wednesday 20 May 2026 LOSS -7.9
Eusman, R.M. (Ruben) (1618) Wednesday 20 May 2026 LOSS -9.1
Ersöz, B.H. (Baris) (1631) Tuesday 19 May 2026 LOSS -4.3
Koolstra, J.R. (Jan) (1607) Monday 30 March 2026 WIN +16.1
Eusman, R.M. (Ruben) (1658) Tuesday 24 February 2026 LOSS -7.6
Spiekerman, E. (Emile) Thursday 5 February 2026 DRAW
Beekhuis, L. (Lennart) (1624) Tuesday 2 December 2025 DRAW +4.0