USCF player statistics
Kao, Isabelle Zirong
Official US Chess record- FIDE
- FIDE 0
Regular rating
Published rating · Sep 2026 · 10 published updates since Dec 2025
Other formats against Regular
-15 Quick vs Regular
No national baseline for this rating band yet.
-254 Blitz vs Regular
No national baseline for this rating band yet.
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
- 9 of 9
- Latest +108, Aug 2026 to Sep 2026
- Typical move
- ±84
- Mean absolute change; spread ±106.2
Regular rating in context
United States
#29,450of 83,635 rated members · higher than 64.7%
54,147 lower · 39 same rating · 29,449 higher · ties share a rank
New York
#3,199of 9,415 rated members · higher than 65.9%
6,212 lower · 5 same rating · 3,198 higher · ties share a rank
Where this rating sits · United States
83,635 rated members in 50-point bands · median 800–849 · 7,271 within 100 points of 1,143 (this player included)
1,100–1,149: 1,828 members (2.1%) · highlighted band is the player’s · dashed line is the target
65% below 1,150 (54,383 of 83,635; 64.7% below 1,143)
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, with this player at their recorded rating: it is a rating comparison, not a prediction of future rank.
Published ratings by month
P marks a provisional rating; the small figure is the change since the previous published observation.
| Month | Regular | Quick | Blitz |
|---|---|---|---|
| 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 |