USCF player statistics
Rosenstock, Ephraim M
Official US Chess record- Top rated · #71 in California (Blitz)
- Top rated · #39 in California (Online Blitz)
- Top rated · #63 in California (Quick)
- Top rated · #90 in California (Regular)
- Fastest rising · #58 in California (Blitz)
- FIDE
- FIDE 39935809
Regular rating
Published rating · Sep 2026 · 10 published updates since Dec 2025
Other formats against Regular
-134 Quick vs Regular
No national baseline for this rating band yet.
-154 Blitz vs Regular
No national baseline for this rating band yet.
-694 Online Regular vs Regular (provisional)
No national baseline for this rating band yet.
-699 Online Quick vs Regular (provisional)
No national baseline for this rating band yet.
-226 Online Blitz vs Regular (provisional)
No national baseline for this rating band yet.
How this rating moves
Between consecutive published observations, provisional included.
- Biggest gain
- +21
- Aug 2026 to Sep 2026
- Biggest drop
- -5
- Mar 2026 to Apr 2026
- Longest rise
- 4 updates
- +40 from May 2026 to Sep 2026
- Updates that moved
- 7 of 9
- Latest +21, Aug 2026 to Sep 2026
- Typical move
- ±7
- Mean absolute change; spread ±7.7
Regular rating in context
United States
#449of 83,635 rated members · higher than 99.4%
83,184 lower · 3 same rating · 448 higher · ties share a rank
California
#90of 9,051 rated members · higher than 99%
8,961 lower · 1 same rating · 89 higher · ties share a rank
Where this rating sits · United States
83,635 rated members in 50-point bands · median 800–849 · 739 within 100 points of 2,304 (this player included)
2,300–2,349: 157 members (0.1%) · highlighted band is the player’s · dashed line is the target
99.6% below 2,350 (83,324 of 83,635; 99.4% below 2,304)
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 | Online Regular | Online Quick | Online Blitz |
|---|---|---|---|---|---|---|
| Sep 2026 | 2,304+21 | 2,170+26 | 2,150+8 | 1,610 Pno change · 13 games | 1,605 Pno change · 24 games | 2,078 Pno change · 19 games |
| Aug 2026 | 2,283+7 | 2,144+10 | 2,142no change | 1,610 Pno change · 13 games | 1,605 Pno change · 24 games | 2,078 P-34 · 19 games |
| Jul 2026 | 2,276+2 | 2,134no change | 2,142+19 | 1,610 Pno change · 13 games | 1,605 Pno change · 24 games | 2,112 Pno change · 17 games |
| Jun 2026 | 2,274+10 | 2,134+5 | 2,123no change | 1,610 Pno change · 13 games | 1,605 Pno change · 24 games | 2,112 Pno change · 17 games |
| May 2026 | 2,264no change | 2,129no change | 2,123no change | 1,610 Pno change · 13 games | 1,605 Pno change · 24 games | 2,112 Pno change · 17 games |
| Apr 2026 | 2,264-5 | 2,129-14 | 2,123no change | 1,610 Pno change · 13 games | 1,605 Pno change · 24 games | 2,112 Pno change · 17 games |
| Mar 2026 | 2,269+8 | 2,143+5 | 2,123no change | 1,610 Pno change · 13 games | 1,605 Pno change · 24 games | 2,112 Pno change · 17 games |
| Feb 2026 | 2,261+11 | 2,138+2 | 2,123-7 | 1,610 Pno change · 13 games | 1,605 Pno change · 24 games | 2,112 Pno change · 17 games |
| Jan 2026 | 2,250no change | 2,136no change | 2,130+12 | 1,610 Pno change · 13 games | 1,605 Pno change · 24 games | 2,112 Pno change · 17 games |
| Dec 2025 | 2,250 | 2,136 | 2,118 | 1,610 P13 games | 1,605 P24 games | 2,112 P17 games |