USCF player statistics
Mast, Thomas
Official US Chess recordRegular rating
Provisional rating · Sep 2026 · 3 published updates since Jul 2026
Other formats against Regular
+10 Quick vs Regular (provisional)
No national baseline for this rating band yet.
How this rating moves
Between consecutive published observations, provisional included.
- Biggest gain
- +149
- Jul 2026 to Aug 2026
- Biggest drop
- -18
- Aug 2026 to Sep 2026
- Longest rise
- 1 update
- +149 from Jul 2026 to Aug 2026
- Updates that moved
- 2 of 2
- Latest -18, Aug 2026 to Sep 2026
- Typical move
- ±84
- Mean absolute change; spread ±118.1
Regular rating in context
United States
#72,068of 83,635 rated members · higher than 13.7%
11,526 lower · 42 same rating · 72,067 higher · ties share a rank
California
#7,976of 9,051 rated members · higher than 11.8%
1,071 lower · 5 same rating · 7,975 higher · ties share a rank
Where this rating sits · United States
83,635 rated members in 50-point bands · median 800–849 · 9,995 within 100 points of 252 (this player included)
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; 13.7% below 252)
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 |
|---|---|---|
| Sep 2026 | 252 P-18 · 11 games | 262 P-27 · 11 games |
| Aug 2026 | 270 P+149 · 9 games | 289 P+145 · 9 games |
| Jul 2026 | 121 P4 games | 144 P4 games |
| Jun 2026 | — | — |