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Siem Westerhof

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NED · 13 yrs · K=40 · Peak 1659 (By Feb 2026)

Best performance: 1759 at OSBO Snelschaakkampioenschap 2026(Best of 2026)

World #=69409 live, down 1268#68,141 publishedNetherlands #=701Europe #=35689among active players

Blitz rating

1635

FIDE’s November 2026 list. No rated games since, so the live rating is the same.

On FIDE’s list since Feb 2026

How live ratings are calculated

Rating History · Blitz

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Blitz rating 1659 to 1635 since February 2026; peak 1659 by February 2026.

Official rating by month

Each month: the rating, its change from the list before, and the rated games FIDE counted.

ListClassicalBlitz
Nov 20261601, -3, 1 game1635, -14, 10 games
Oct 20261604, 0, 0 games1649, 0, 0 games
Sep 20261604, -2, 4 games1649, -8, 9 games
Aug 20261606, -5, 7 games1657, 0, 0 games
Jul 20261611, +26, 2 games1657, 0, 0 games
Jun 20261585, 0, 0 games1657, 0, 0 games
May 20261585, 0, 0 games1657, 0, 0 games
Apr 20261585, +22, 4 games1657, -2, 0 games
Mar 20261563, -20, 2 games1659, 0, 0 games
Feb 20261583, +20, 2 games1659, 12 games
Jan 20261563, -4, 1 gameunrated
Dec 20251567, -2, 1 gameunrated

Form · Blitz

oldest → latest

Unbeaten in the last 2 games (2 wins), since Oct 25. Longest unbeaten run in 2026: 6 games, Jan 3.

From 65 blitz games on record, the latest on Oct 25.

Blitz games since the November list

No rated blitz games this rating periodsince the NOV26 list (Nov 1, 2026)

Show gamesLast playedScore
NK Snelschaak jeugd 2026 - Groep BCOct 25TPR 16256½/16

The live rating moves only when new rated games are played. Until then it matches the published rating.

Best wins · Blitz

From 31 rated blitz games against rated opponents, 2026

#OpponentRating
1, Benny Gronhoj, Aug 2026 · Summer Prague Open 2026 - E - blitz, 1956*
2, Hans Polman, Jan 2026 · OSBO Snelschaakkampioenschap 2026, 1792
3, Lex Van Hattum, 2 wins, Jan 2026 · OSBO Snelschaakkampioenschap 2026, 1743

* No blitz rating yet, so FIDE rates the game at the player's classical rating.

Event timeline · Blitz

5 events

Events before the current rating period show the performance, not a rating change.

Live events show the rating change; earlier events show the performance rating.

Performance rating by year

YearGamesScoreAvg oppTPR
20263111½17811686

Games count in the month they were played. Each month and year is one performance rating over all of its rated games.

Rated near Siem Westerhof · Blitz

World

  1. #=69409Gaston De La Pena1635.0
  2. #=69409Jan Bargeman1635.0
  3. #=69409Siem Westerhof1635.0
  4. #=69409Mariusz Kulakiewicz1635.0
  5. #=69409Lionel Vaurasi1635.0

Netherlands

  1. #=699Kazem Mollahosseini1636.0
  2. #=701Jan Bargeman1635.0
  3. #=701Siem Westerhof1635.0
  4. #703Kaja Van Buren1634.0
  5. #704Parv Garg1633.0

Live rating: FIDE’s November list plus every rated game played since. Not affiliated with FIDE.