KNSB FIDE
SW

Siem Westerhof

Rated since January 2023

1647 Classic
1680 Rapid
1714 Blitz

RIVALRY

Not enough games to determine rivalries yet.

The good & the bad

Best wins
GRONHOJ, BENNY 1956
SUMMER PRAGUE OPEN 2026 E - blitz tournament · Wednesday 12 August 2026
POLMAN, J.A.P. (HANS) 1870
12381 Oostelijk snelschaakkampioenschap Groep A · Saturday 3 January 2026
OOSTERINK, H.W. (HENK) 1800
12381 Oostelijk snelschaakkampioenschap Groep A · Saturday 3 January 2026
RAI, A. (ATHARV) 1758
13935 Afdeling Oost, JCC categorie C Groep A · Saturday 6 June 2026
HATTUM VAN, A.H. (LEX) 1750
12381 Oostelijk snelschaakkampioenschap Groep A · Saturday 3 January 2026
Worst losses
HEINER, W.N. (WILLEM) 1416
13935 Afdeling Oost, JCC categorie C Groep A · Saturday 6 June 2026
BERENDS, D. (DANI) 1500
12381 Oostelijk snelschaakkampioenschap Groep A · Saturday 3 January 2026
POKORNY, WYATT 1551
SUMMER PRAGUE OPEN 2026 E - blitz tournament · Wednesday 12 August 2026
BERENDS, C. (COLIN) 1560
12381 Oostelijk snelschaakkampioenschap Groep A · Saturday 3 January 2026
BAKHRU, D. (DEEPESH) 1582
10471 Tata Steel Chess Tournament 2026 Weekendvierkampem · Sunday 18 January 2026
KNSB-Jeugdclubcompetitie 1, ACP Meesterklasse C Thursday 17 September 2026 +1–2=0 +10.1
SUMMER PRAGUE OPEN 2026 - B - FIDE open Friday 7 August 2026 +1–1=2 -4.8
Open NK Schaken 2026 Reserve C Tuesday 21 July 2026 +2–4=2 -9.4
18de BPB Limburg Open 2026 Groep D Friday 22 May 2026 +3–2=1 +17.3
Jeugd Weekendtoernooi Twente Groep A Friday 27 February 2026 +2–2=1 +47.8
85e Daniel Noteboomtoernooi Groep C Friday 20 February 2026 +1–2=1 -23.8
Tata Steel Chess Tournament 2026 Weekendvierkampem Friday 16 January 2026 +1–2=0 -9.0
Oostelijk snelschaakkampioenschap Groep A Saturday 3 January 2026 +10–10=0 +117.6
41. Internationales Boeblinger Open B Friday 26 December 2025 +0–1=0 -5.0
SUMMER PRAGUE OPEN 2026 E - blitz tournament Wednesday 12 August 2026 +3–5=1 -45.5
Afdeling Oost, JCC categorie C Groep A Saturday 6 June 2026 +4–1=0 +33.1
KNSB competitie 2025-2026 Klasse 4 ronde 7 Saturday 20 September 2025 +0–1=0 -3.6

Team Competition

Current team
Doetinchem 1
Klasse 4B · 2025-2026 · 4 games
Past teams
Doetinchem 1
Klasse 5C · 2024-2025
Doetinchem 1
Klasse 5C · 2023-2024

Rating History

Loading rating history...

Peak Ratings

Classic 1656 June 1, 2025
Rapid 1680 Oct. 1, 2026
Blitz 1750 March 1, 2026

Games

Wins 28
Losses 33
Draws 8
Win Rate 41%

Performance by Color

Color Wins Draws Losses Win Rate
White 15 6 15 42%
Black 13 2 18 39%

Recent Matches

Veldhuis, J. (Jasper) (1750) Saturday 26 September 2026 LOSS -13.6
Eswar, A. (Aadith) (1699) Saturday 26 September 2026 WIN +23.7
Nguyen, A. (Anh Khôi) Saturday 26 September 2026 LOSS
Avilova, Yulia (1854) Wednesday 12 August 2026 LOSS -14.3
Parth Pathare (1563) Wednesday 12 August 2026 WIN +10.3
Wojnicz, Marcin (1586) Wednesday 12 August 2026 DRAW -8.7
Kosteas, Frixos Vasileios (1632) Wednesday 12 August 2026 LOSS -26.4
Harasta, Frantisek (1547) Wednesday 12 August 2026 WIN +9.6
Markina, Sofiia (2007) Wednesday 12 August 2026 LOSS -7.4
Gronhoj, Benny (1956) Wednesday 12 August 2026 WIN +30.6
Pokorny, Wyatt (1551) Wednesday 12 August 2026 LOSS -30.3
Vlcek, Marek (1969) Wednesday 12 August 2026 LOSS -8.9
Jefimova, Marija (1522) Monday 10 August 2026 DRAW -5.5
Skalicky, Miroslav (1477) Sunday 9 August 2026 WIN +12.2
Kammova, Natalie (1497) Saturday 8 August 2026 DRAW -6.8
Jun, Robert (1958) Friday 7 August 2026 LOSS -4.8
Beek van der, S. (Simon) (1691) Wednesday 29 July 2026 LOSS -16.1
Doorn, W.J. (Wouter) (1673) Monday 27 July 2026 LOSS -17.1
Booy, W.A. (Willem) (1666) Sunday 26 July 2026 WIN +22.5
Lunek, F. (Ferry) (1707) Saturday 25 July 2026 LOSS -15.3