USCF player statistics
Lee, Oisin Duffy
Official US Chess recordRegular rating
Published rating · Sep 2026 · 10 published updates since Dec 2025
Other formats against Regular
-2 Quick vs Regular
No national baseline for this rating band yet.
How this rating moves
Between consecutive published observations, provisional included.
- Biggest gain
- +95
- Jun 2026 to Jul 2026
- Biggest drop
- -54
- Mar 2026 to Apr 2026
- Longest rise
- 1 update
- +95 from Jun 2026 to Jul 2026
- Current run
- 2 updates
- Unchanged since Jul 2026
- Typical move
- ±25
- Mean absolute change; spread ±40.2
Regular rating in context
United States
14.4%of the comparison population has a lower rating.
12,094 lower · 52 same rating · 71,489 higher
Where this rating sits · United States
83,635 rated members in 50-point bands · median 800–849 · 10,120 within 100 points of 263
250–299: 2,532 members (3%) · highlighted band is the player’s · dashed line is the target
16.6% below 300 (13,947 of 83,635; 14.4% below 263)
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.
Published ratings by month
P marks a provisional rating; the small figure is the change since the previous published observation.
| Month | Regular | Quick |
|---|---|---|
| Sep 2026 | 263no change | 261no change |
| Aug 2026 | 263no change | 261no change |
| Jul 2026 | 263+95 | 261+96 |
| Jun 2026 | 168no change | 165no change |
| May 2026 | 168+4 | 165+2 |
| Apr 2026 | 164-54 | 163-54 |
| Mar 2026 | 218 P+40 · 24 games | 217 P+39 · 24 games |
| Feb 2026 | 178 Pno change · 24 games | 178 Pno change · 24 games |
| Jan 2026 | 178 P+28 · 20 games | 178 P+29 · 20 games |
| Dec 2025 | 150 P20 games | 149 P20 games |