KNSB FIDE
SW

Sebastiaan van Westerop

Rated since January 2023

1927 Classic
1954 Rapid
1954 Blitz

RIVALRY

Not enough games to determine rivalries yet.

The good & the bad

Best wins
FRAIKIN, E.H. (ERIC) 1983
8281 Tata Steel Chess Tournament 2025 Tienkampen · Sunday 26 January 2025
CRUYFF, R. (RAF) 1977
10943 SGA Competitie 2024-2025 1e Klasse A ronde 5 en 6 · Thursday 27 February 2025
HEUVEL VAN DEN, R. (ROB) 1969
12593 KNSB competitie 2025-2026 Klasse 4 ronde 5 · Saturday 13 December 2025
HOEFSLOOT, N. (NIELS) 1960
11044 SGA Competitie 2024-2025 Zilveren Beker kwartfinale · Thursday 6 March 2025
COHN, S. (SAMUEL) 1947
8281 Tata Steel Chess Tournament 2025 Tienkampen · Friday 24 January 2025
Worst losses
BUSCHMAN, R. (ROB) 1621
6968 KNSB competitie 2022-2023 Klasse 5 ronde 7 · Saturday 1 April 2023
WITTE DE, W. (WIEBE) 1757
6418 Tata Steel Chess Tournament 2023 Tienkampen · Monday 23 January 2023
GAGNEPAIN, L. (LAURENT) 1763
7620 Tata Steel Chess Tournament 2024 Tienkampen · Friday 19 January 2024
DREWES, B.A. (BENNO) 1775
6236 KNSB competitie 2022-2023 Klasse 5 ronde 4 · Saturday 17 December 2022
KERSTEN, P. (PETER) 1786
13404 SGA Competitie 2025-2026 2e Klasse B ronde 5 en 6 · Friday 27 February 2026
Tata Steel Chess Tournament 2026 Tienkampen Friday 16 January 2026 +4–1=4 +29.8
Tata Steel Chess Tournament 2025 Tienkampen Friday 17 January 2025 +2–4=2 +5.6
Tata Steel Chess Tournament 2024 Tienkampen Friday 12 January 2024 +6–3=0 +42.5
Tata Steel Chess Tournament 2023 Tienkampen Friday 13 January 2023 +4–1=0 +30.5
SGA Competitie 2025-2026 2e Klasse B ronde 7 Wednesday 1 October 2025 +0–1=0 -14.1
SGA Competitie 2025-2026 2e Klasse B ronde 5 en 6 Wednesday 1 October 2025 +0–2=2 -51.2
SGA Competitie 2025-2026 2e Klasse B ronde 4 Wednesday 1 October 2025 +1–0=0 +4.8
SGA Competitie 2025-2026 2e Klasse B ronde 3 en 5 Wednesday 1 October 2025 +1–0=0 +10.3
SGA Competitie 2025-2026 2e Klasse B ronde 1 Wednesday 1 October 2025 +1–1=0 +7.3
KNSB competitie 2025-2026 Klasse 4 ronde 9 Saturday 20 September 2025 +0–1=0 -12.9
KNSB competitie 2025-2026 Klasse 4 ronde 8 Saturday 20 September 2025 +2–0=0 +22.4
KNSB competitie 2025-2026 Klasse 4 ronde 7 Saturday 20 September 2025 +0–0=1 +0.7
KNSB competitie 2025-2026 Klasse 4 ronde 5 Saturday 20 September 2025 +1–0=0 +14.7
KNSB competitie 2025-2026 Klasse 4 ronde 3 Saturday 20 September 2025 +0–1=0 -10.2
KNSB competitie 2025-2026 Klasse 4 ronde 2 Saturday 20 September 2025 +0–0=1 -3.1
KNSB competitie 2025-2026 Klasse 4 ronde 1 Saturday 20 September 2025 +0–0=1 -3.0
SGA Competitie 2024-2025 1e Klasse A ronde 6 en 7 Monday 30 September 2024 +0–0=1 -0.7
SGA Competitie 2024-2025 1e Klasse A ronde 5 en 6 Monday 30 September 2024 +1–1=0 +1.8
SGA Competitie 2024-2025 Zilveren Beker kwartfinale Monday 30 September 2024 +1–0=0 +14.8
SGA Competitie 2024-2025 Zilveren Beker kwartfinale Monday 30 September 2024 +0–1=0
SGA Competitie 2024-2025 1e Klasse A ronde 4 Monday 30 September 2024 +1–0=0 +11.1
SGA Competitie 2024-2025 1e Klasse A ronde 3 Monday 30 September 2024 +1–0=0 +12.1
SGA Competitie 2024-2025 1e Klasse A ronde 2 en 3 Monday 30 September 2024 +0–1=0 -10.8
SGA Competitie 2024-2025 1e Klasse A ronde 1 Monday 30 September 2024 +1–0=0 +8.5
KNSB competitie 2024-2025 Klasse 5 ronde 7 Saturday 21 September 2024 +0–0=1 -4.0
KNSB competitie 2024-2025 Klasse 5 ronde 6 Saturday 21 September 2024 +1–0=0 +9.8
KNSB competitie 2024-2025 Klasse 5 ronde 4 Saturday 21 September 2024 +1–0=0 +6.1
KNSB competitie 2024-2025 Klasse 5 ronde 3 Saturday 21 September 2024 +1–0=0 +11.4
KNSB competitie 2024-2025 Klasse 5 ronde 2 Saturday 21 September 2024 +0–0=1 -2.4
SGA Competitie 2023-2024 1e Klasse B ronde 7 Sunday 1 October 2023 +0–1=0 -11.6
SGA Competitie 2023-2024 Zilveren Beker halve finale Sunday 1 October 2023 +0–1=0 -14.6
SGA Competitie 2023-2024 1e Klasse B ronde 6 en 7 Sunday 1 October 2023 +0–1=0 -13.3
SGA Competitie 2023-2024 1e Klasse B ronde 5 Sunday 1 October 2023 +0–1=0 -15.2
SGA Competitie 2023-2024 Zilveren Beker kwartfinale Sunday 1 October 2023 +1–0=0 +7.1
SGA Competitie 2023-2024 1e Klasse B ronde 4 Sunday 1 October 2023 +0–1=0 -6.0
SGA Competitie 2023-2024 Zilveren Beker ronde 1 en 2 Sunday 1 October 2023 +1–0=0 +12.7
SGA Competitie 2023-2024 1e Klasse B ronde 1 Sunday 1 October 2023 +0–0=1 +4.7
KNSB competitie 2023-2024 Klasse 5 ronde 6 Saturday 16 September 2023 +1–0=0
KNSB competitie 2023-2024 Klasse 5 ronde 5 Saturday 16 September 2023 +1–0=0 +8.9
KNSB competitie 2023-2024 Klasse 5 ronde 4 Saturday 16 September 2023 +1–0=0 +14.0
KNSB competitie 2023-2024 Klasse 5 ronde 3 Saturday 16 September 2023 +1–0=0 +8.4
KNSB competitie 2023-2024 Klasse 5 ronde 2 Saturday 16 September 2023 +1–0=0 +0.8
KNSB competitie 2023-2024 Klasse 5 ronde 1 Saturday 16 September 2023 +0–0=1 +1.5
SGA Competitie 2022-2023 1e Klasse A ronde 5 en 7 Saturday 1 October 2022 +0–0=1 -1.8
SGA Competitie 2022-2023 1e Klasse A ronde 6 Saturday 1 October 2022 +0–0=1 -3.7
SGA Competitie 2022-2023 1e Klasse A ronde 4 Saturday 1 October 2022 +0–0=1 +1.0
SGA Competitie 2022-2023 1e Klasse A ronde 3 Saturday 1 October 2022 +0–1=0 -11.4
KNSB competitie 2022-2023 Klasse 5 ronde 7 Saturday 17 September 2022 +0–1=0 -17.4
KNSB competitie 2022-2023 Klasse 5 ronde 6 Saturday 17 September 2022 +1–0=0
KNSB competitie 2022-2023 Klasse 5 ronde 5 Saturday 17 September 2022 +0–1=0 -8.1
KNSB competitie 2022-2023 Klasse 5 ronde 4 Saturday 17 September 2022 +0–1=0 -12.5

Rating History

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Peak Ratings

Classic 1968 March 1, 2026
Rapid 1968 March 1, 2026
Blitz 1968 March 1, 2026

Games

Wins 38
Losses 27
Draws 19
Win Rate 45%

Performance by Color

Color Wins Draws Losses Win Rate
White 21 11 13 47%
Black 17 8 14 44%

Recent Matches

Doorn, D.J. (Daniel) (1907) Thursday 23 April 2026 LOSS -14.1
Nie van, J. (Jonathan) (1944) Saturday 11 April 2026 LOSS -12.9
Heima, H.J.M. (Henny) (1691) Monday 16 March 2026 DRAW -8.4
Heima, H.J.M. (Henny) (1691) Monday 16 March 2026 DRAW -8.4
Ozkoc, S. (Serkan) (1931) Saturday 7 March 2026 WIN +11.2
Ozkoc, S. (Serkan) (1931) Saturday 7 March 2026 WIN +11.2
Kersten, P. (Peter) (1786) Friday 27 February 2026 LOSS -17.2
Kersten, P. (Peter) (1786) Friday 27 February 2026 LOSS -17.2
Someren van, R. (Rob) (1948) Saturday 7 February 2026 DRAW +0.7
Riet van der, E.J. (Ernst) (1903) Sunday 1 February 2026 WIN +11.8
Pasti, F. (Fabio) (1921) Saturday 31 January 2026 LOSS -12.5
Bautista, K.C. (Keith) (1926) Friday 30 January 2026 DRAW +0.1
Hendriks, J.P.E.M. (Jos) (1875) Wednesday 28 January 2026 WIN +10.9
CM Croes, O. (Octavio) (1827) Tuesday 27 January 2026 WIN +9.2
Graaf, J. (Jeroen) (1908) Monday 26 January 2026 DRAW -0.5
Qazi, Rafeh (1935) Sunday 25 January 2026 WIN +13.0
Bax, A.J. (Martijn) (1882) Saturday 24 January 2026 DRAW -1.4
Heijlman, M. (Martin) (1897) Friday 23 January 2026 DRAW -0.9
Duifhuis, T. (Tom) (1673) Monday 12 January 2026 WIN +4.8
Heuvel van den, R. (Rob) (1969) Saturday 13 December 2025 WIN +14.7