KNSB FIDE
KS

Klaas Siewertsen

Rated since January 2023

1484 Classic
1517 Rapid
1503 Blitz

RIVALRY

Nemesis
Bajnath, A. (Amresh)
Games: 3 · Win rate: 100%

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
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 12
Losses 24
Draws 7
Win Rate 28%

Performance by Color

Color Wins Draws Losses Win Rate
White 5 3 12 25%
Black 7 4 12 30%

Recent Matches

Gooijers, R. (Richard) (1369) Sunday 19 July 2026 WIN +7.6
Gooijers, R. (Richard) (1369) Sunday 19 July 2026 WIN +7.6
Peper, J.P.C. (Jeroen) (1848) Saturday 18 July 2026 LOSS -3.1
Peper, J.P.C. (Jeroen) (1848) Saturday 18 July 2026 LOSS -3.1
Bajnath, A. (Amresh) (1436) Friday 17 July 2026 WIN +9.8
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
Kaptein, P.L.W.M. (Peter) (1594) Thursday 16 July 2026 LOSS -9.8
Mangold, L. (Lucas) Wednesday 15 July 2026 WIN
Mangold, L. (Lucas) Wednesday 15 July 2026 WIN
Mesbih, N. (Nael) Tuesday 14 July 2026 WIN
Mesbih, N. (Nael) Tuesday 14 July 2026 WIN
Tulenbayeva, Aliiya (1538) Monday 13 July 2026 LOSS -11.7
Tulenbayeva, Aliiya (1538) Monday 13 July 2026 LOSS -11.7
Pelt, J.A. (Hans) (1726) Sunday 12 July 2026 LOSS -5.8
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
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