USCF player statistics

Kao, Isabelle Zirong

USCF 31540856New YorkUpdated: Oct 2026

Official US Chess record

Gender: Female
FIDE: FIDE 0
US Chess reported rank: #22,799 national · #2,647 in state
Floor: Regular 150 · Quick 150 · Blitz 136

US Chess record as of Sep 16, 2026

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Regular rating

1,138-5 since Sep 2026

Published rating · Oct 2026 · 11 published updates since Dec 2025

Oct 20261,138 Regular

Compare format

Dec 2025Oct 2026

11 updates in this window · +42 first to last · open points are provisional · guides mark US Chess classes · unpublished months are skipped, not inactivity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

-19 Quick vs Regular
Typical for 1,100–1,199 regular players: -39 (middle half -90 to -9, 2,023 established members). This gap is within the typical range.
-249 Blitz vs Regular
Typical for 1,100–1,199 regular players: -163 (middle half -306 to -52, 365 established members). This gap is within the typical range.

How this rating moves

Between consecutive published observations, provisional included.

Biggest gain: +189; Jan 2026 to Feb 2026
Biggest drop: -132; Feb 2026 to Mar 2026
Longest rise: 2 updates; +223 from Dec 2025 to Feb 2026
Updates that moved: 10 of 10; Latest -5, Sep 2026 to Oct 2026
Typical move: ±76; Mean absolute change; spread ±100.2

Regular rating in context

Oct 2026 update

United States

#29,679of 82,596 rated members · higher than 64%

52,881 lower · 37 same rating · 29,678 higher · ties share a rank

New York

#3,144of 9,044 rated members · higher than 65.1%

5,893 lower · 8 same rating · 3,143 higher · ties share a rank

Where this rating sits · United States

82,596 rated members in 50-point bands · median 800–849 · 7,262 within 100 points of 1,138 (this player included)

Player · 1,138

01,4502,900

1,100–1,149: 1,836 members (2.2%) · highlighted band is the player’s · dashed line is the target

Target 1,150

64.5% below 1,150 (53,296 of 82,596; 64% below 1,138)

Percentile over time · United States

64% higher than · Oct 2026 · rank #29,679 of 82,596

Since Dec 2025
+1.7 pts

Dec 2025Oct 2026

Each month against that month’s active pool, so pool growth and rating drift both count.

How these comparisons are calculated

Chess67 calculations from the Oct 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, with this player at their recorded rating: it is a rating comparison, not a prediction of future rank.

United States statistics New York 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 Kao, Isabelle Zirong
Month	Regular	Quick	Blitz
Oct 2026	1,138-5	1,119-9	889no change
Sep 2026	1,143+108	1,128+113	889no change
Aug 2026	1,035-120	1,015-128	889no change
Jul 2026	1,155-47	1,143-42	889+59
Jun 2026	1,202-56	1,185-30	830no change
May 2026	1,258+69	1,215+54	830no change
Apr 2026	1,189+2	1,161+42	830no change
Mar 2026	1,187-132	1,119-135	830-31
Feb 2026	1,319+189	1,254+149	861-1
Jan 2026	1,130+34	1,105+7	862 P+9 · 23 games
Dec 2025	1,096	1,098	853 P23 games

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