USCF player statistics

Guerrero, William

USCF 33056437IllinoisLatest monthly rating update: Sep 2026

FIDE: FIDE 343097319

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Regular rating

1,072+120 since Aug 2026

Published rating · Sep 2026 · 5 published updates since May 2026

Sep 20261,072 Regular

Compare format

May 2026Sep 2026

5 updates in this window · open points are provisional · guides mark US Chess classes · unpublished months are skipped, not inactivity

Compare with another playerOverlays their published ratings on the chart; the link keeps the comparison.

Other formats against Regular

-23 Quick vs Regular
No national baseline for this rating band yet.
+67 Blitz vs Regular
No national baseline for this rating band yet.

How this rating moves

Between consecutive published observations, provisional included.

Biggest gain: +120; Aug 2026 to Sep 2026
Biggest drop: -33; Jun 2026 to Jul 2026
Longest rise: 2 updates; +141 from Jul 2026 to Sep 2026
Updates that moved: 4 of 4; Latest +120, Aug 2026 to Sep 2026
Typical move: ±47; Mean absolute change; spread ±67.7

Regular rating in context

Sep 2026 update

United States

61.5%of the comparison population has a lower rating.

51,508 lower · 43 same rating · 32,084 higher

Illinois

69.1%of the comparison population has a lower rating.

3,234 lower · 1 same rating · 1,443 higher

Where this rating sits · United States

83,635 rated members in 50-point bands · median 800–849 · 7,592 within 100 points of 1,072

Player · 1,072

01,4502,900

1,050–1,099: 1,855 members (2.2%) · highlighted band is the player’s · dashed line is the target

Target 1,100

62.8% below 1,100 (52,555 of 83,635; 61.5% below 1,072)

How these comparisons are calculated

Chess67 calculations from the Sep 2026 monthly rating update, using the same population as the USCF statistics pages: US members classified as active in the published monthly records, excluding lifetime-coded records, provisional ratings included. Ties share a rank; “lower” is strictly lower; national and state groups overlap. The target explorer keeps the population fixed: it is a rating comparison, not a prediction of future rank. This player is outside that comparison population; no membership rank is assigned.

United States statistics Illinois statistics

Published ratings by month

P marks a provisional rating; the small figure is the change since the previous published observation.

Monthly USCF ratings for Guerrero, William
Month	Regular	Quick	Blitz
Sep 2026	1,072+120	1,049+133	1,139+53
Aug 2026	952+21	916+27	1,086+192
Jul 2026	931-33	889-47	894-3
Jun 2026	964-12	936 P-32 · 24 games	897+25
May 2026	976 P9 games	968 P9 games	872 P20 games