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Jan Kosiarz

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POL · 13 yrs · K=40 · Peak 1445 (Dec 2025)

Best performance: 1420 at Grand Hotel Kielce Chess Open 2025 - Turniej C (U14)(Best of 2025)

World #=538623Poland #=15755among all players, November list

Classical rating

1445

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

On FIDE’s list since Nov 2025 · Inactive on FIDE’s list

How live ratings are calculated

Rating History · Classical

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Classical rating 1444 to 1445 over the last 12 months; peak 1445 in December 2025.

Official rating by month

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

ListClassicalRapidBlitz
Nov 20261445, 0, 0 games1566, 0, 0 games1505, 0, 0 games
Oct 20261445, 0, 0 games1566, 0, 0 games1505, -2, 0 games
Sep 20261445, 0, 0 games1566, 0, 0 games1507, 0, 0 games
Aug 20261445, 0, 0 games1566, 0, 0 games1507, +11, 10 games
Jul 20261445, 0, 0 games1566, 0, 0 games1496, 0, 0 games
Jun 20261445, 0, 0 games1566, 0, 0 games1496, 0, 0 games
May 20261445, 0, 0 games1566, 0, 0 games1496, 0, 0 games
Apr 20261445, +1, 0 games1566, 0, 0 games1496, +2, 0 games
Mar 20261444, -1, 0 games1566, 0, 0 games1494, -2, 0 games
Feb 20261445, 0, 0 games1566, 0, 0 games1496, +5, 0 games
Jan 20261445, 0, 0 games1566, 0, 0 games1491, +1, 0 games
Dec 20251445, +1, 0 games1566, 0, 0 games1490, 0, 0 games

Form · Classical

oldest → latest

From 36 classical games on record, the latest on Oct 10, 2025.

Classical games since the November list

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

Last playedScore
Eliminacje Strefowe do OOM 2026 - C13 (LD-SK)Oct 6, 2025 – Oct 10, 2025TPR 13622½/9

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

Best wins · Classical

From 22 rated classical games against rated opponents, 2024–2025

#OpponentRating
1, Filip Slawski, Jul 2025 · Grand Hotel Kielce Chess Open 2025 - Turniej C (U14), 1514

Event timeline · Classical

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
2025163½15521332
20246115031230

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

Rated near Jan Kosiarz · Classical · November list, all players

World

  1. #=538623Ploutarchos Konnaris1445
  2. #=538623Jozef Kopij1445
  3. #=538623Jan Kosiarz1445
  4. #=538623Magdalena Kosiorek1445
  5. #=538623Polyxeni Kouroukechagia1445

Poland

  1. #=15755Andrzej Denisiewicz1445
  2. #=15755Jakub Rubinowski1445
  3. #=15755Jan Kosiarz1445
  4. #=15775Zdzislaw Brzoza1444
  5. #=15775Mateusz Kotula1444

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