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Jaap De Koster

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NED · 15 yrs · K=40 · Peak 1784 (Feb 2026)

Best performance: 1923 at Dutch Team Competition 2025-2026 Klasse 5J(Best of 2026)

World #=88521 live334#88,187 publishedNetherlands #=3463

OCT26 Rating

1764

Live Rating

1764.0

Change

0.0

Games Played

0

Rating History · Classical

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Classical games since the October list

No rated standard games this rating periodsince the OCT26 list (Oct 1, 2026)

Last playedScore
Dutch Team Competition 2025-2026 Klasse 5JOct 4, 2025 – Mar 28TPR 19233½/5

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

Event timeline · Classical

2 of 17 events · All years

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.

Rated near Jaap De Koster · Classical

World

  1. #=88521Simiyu Jerry1764.0
  2. #=88521Jan-Geert Meulenkolk1764.0
  3. #=88521Jaap De Koster1764.0
  4. #=88521MUSAKWA OSCAR1764.0
  5. #=88521Marek Urban1764.0

Netherlands

  1. #=3463Peter Kraaijeveld1764.0
  2. #=3463Jan-Geert Meulenkolk1764.0
  3. #=3463Jaap De Koster1764.0
  4. #=3463Teun Loonen1764.0
  5. #=3463Alkan Suicmez1764.0

Live ratings projected from the OCT26 published list · Not affiliated with FIDE