USCF player statistics

Kosminskas, Mark

USCF 13487854IllinoisLatest monthly rating update: Sep 2026

Official US Chess record

Regular rating

459

Provisional rating · Sep 2026

Sep 2026

459 provisional

Compare format

Dec 2025Sep 2026

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Open points are provisional. Lines connect available observations; missing months do not establish inactivity.

10 monthly rating updates in this window

The comparison field

Regular rating in context

Sep 2026 rating update

United States

26.9%

of the comparison population has a lower rating.

22,555 lower41 same rating61,039 higher

Illinois

34.5%

of the comparison population has a lower rating.

1,615 lower2 same rating3,061 higher

Where this rating sits

83,635 rated members · 50-point bands

Median falls in
800–849

10,944 members have ratings within 100 points of 459.

Player · 459

01,4502,900

Highlighted band: player rating · Dashed line: target rating

450–499: 2,720 members (3.2%). Select a band to explore the distribution.

Explore a target rating

Compare a rating with this published population.

Target rating 500

29.6% have ratings below 500.

24,763 of 83,635 members. At 459, the figure is 26.9%.

The population stays fixed. This is a rating comparison, not a prediction of future rank or results.

How these comparisons are calculated

Calculated from the Sep 2026 monthly rating update, using the same population as Chess67’s USCF statistics: US members classified as active in the published monthly records, excluding lifetime-coded records. Includes provisional ratings. These are Chess67 calculations, not official US Chess rankings. “Lower” is strictly lower; ties share a rank. National and state groups overlap. This player is outside that comparison population; no membership rank is assigned.

Explore United States statistics Explore Illinois statistics

Published ratings by month

All available formats. P indicates a provisional rating.

Monthly USCF ratings for Kosminskas, Mark
Month	Regular	Quick
Sep 2026	459 P	383 P
Aug 2026	459 P	383 P
Jul 2026	459 P	383 P
Jun 2026	459 P	383 P
May 2026	459 P	383 P
Apr 2026	459 P	383 P
Mar 2026	459 P	383 P
Feb 2026	459 P	383 P
Jan 2026	459 P	383 P
Dec 2025	459 P	383 P

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