USCF player statistics
Koh, Isaac
Official US Chess record- FIDE
- FIDE 39931323
Regular rating
Published rating · Sep 2026 · 10 published updates since Dec 2025
Other formats against Regular
-417 Quick vs Regular (provisional)
No national baseline for this rating band yet.
-31 Blitz vs Regular
No national baseline for this rating band yet.
How this rating moves
Between consecutive published observations, provisional included.
- Biggest gain
- +278
- Jul 2026 to Aug 2026
- Biggest drop
- —
- No drop between published updates yet
- Longest rise
- 1 update
- +278 from Jul 2026 to Aug 2026
- Current run
- 1 update
- Unchanged since Aug 2026
- Typical move
- ±31
- Mean absolute change; spread ±92.7
Regular rating in context
United States
#9,041of 83,635 rated members · higher than 89.1%
74,564 lower · 31 same rating · 9,040 higher · ties share a rank
Illinois
#386of 4,678 rated members · higher than 91.7%
4,291 lower · 2 same rating · 385 higher · ties share a rank
Where this rating sits · United States
83,635 rated members in 50-point bands · median 800–849 · 5,905 within 100 points of 1,747 (this player included)
1,700–1,749: 1,684 members (2%) · highlighted band is the player’s · dashed line is the target
89.2% below 1,750 (74,637 of 83,635; 89.1% below 1,747)
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 | 1,747no change | 1,330 Pno change · 19 games | 1,716no change |
| Aug 2026 | 1,747+278 | 1,330 P+216 · 19 games | 1,716+277 |
| Jul 2026 | 1,469no change | 1,114 Pno change · 14 games | 1,439no change |
| Jun 2026 | 1,469no change | 1,114 Pno change · 14 games | 1,439no change |
| May 2026 | 1,469no change | 1,114 Pno change · 14 games | 1,439no change |
| Apr 2026 | 1,469no change | 1,114 Pno change · 14 games | 1,439no change |
| Mar 2026 | 1,469no change | 1,114 Pno change · 14 games | 1,439no change |
| Feb 2026 | 1,469no change | 1,114 Pno change · 14 games | 1,439no change |
| Jan 2026 | 1,469no change | 1,114 Pno change · 14 games | 1,439no change |
| Dec 2025 | 1,469 | 1,114 P14 games | 1,439 |