USCF player statistics

Rosenstock, Ephraim M

USCF 30265844CaliforniaUpdated: Oct 2026

Official US Chess record

Gender: Male
FIDE: FIDE 39935809
US Chess reported rank: #421 national · #35 in state
Floor: Regular 2,100 · Quick 1,900 · Blitz 1,900 · Online Regular 100 · Online Quick 100 · Online Blitz 100
Rated games: Online Regular 13 · Online Quick 24 · Online Blitz 19

US Chess record as of Sep 15, 2026

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Regular rating

2,286-18 since Sep 2026

Published rating · Oct 2026 · 11 published updates since Dec 2025

Oct 20262,286 Regular

Compare format

Dec 2025Oct 2026

11 updates in this window · +36 first to last · open points are provisional · guides mark US Chess classes · unpublished months are skipped, not inactivity

Compare with another playerOverlays their published ratings on the chart; the link keeps the comparison.

Other formats against Regular

-148 Quick vs Regular
Typical for 2,200–2,299 regular players: -170 (middle half -248 to -94, 546 established members). This gap is within the typical range.
-134 Blitz vs Regular
Typical for 2,200–2,299 regular players: -172 (middle half -283 to -91, 399 established members). This gap is within the typical range.
-676 Online Regular vs Regular (provisional)
Typical for 2,200–2,299 regular players: -357 (middle half -577 to -184, 146 established members). This gap is below the typical range.
-681 Online Quick vs Regular (provisional)
Typical for 2,200–2,299 regular players: -323 (middle half -580 to -160, 138 established members). This gap is below the typical range.
-208 Online Blitz vs Regular (provisional)
Typical for 2,200–2,299 regular players: -231 (middle half -373 to -107, 122 established members). This gap is within the typical range.

How this rating moves

Between consecutive published observations, provisional included.

Biggest gain: +21; Aug 2026 to Sep 2026
Biggest drop: -18; Sep 2026 to Oct 2026
Longest rise: 4 updates; +40 from May 2026 to Sep 2026
Updates that moved: 8 of 10; Latest -18, Sep 2026 to Oct 2026
Typical move: ±8; Mean absolute change; spread ±10.5

Regular rating in context

Oct 2026 update

United States

#506of 82,596 rated members · higher than 99.3%

82,083 lower · 8 same rating · 505 higher · ties share a rank

California

#97of 9,083 rated members · higher than 98.9%

8,984 lower · 3 same rating · 96 higher · ties share a rank

Where this rating sits · United States

82,596 rated members in 50-point bands · median 800–849 · 977 within 100 points of 2,286 (this player included)

Player · 2,286

01,4502,900

2,250–2,299: 184 members (0.2%) · highlighted band is the player’s · dashed line is the target

Target 2,300

99.4% below 2,300 (82,133 of 82,596; 99.3% below 2,286)

Percentile over time · United States

99.3% higher than · Oct 2026 · rank #506 of 82,596

Since Dec 2025
+0.1 pts

Dec 2025Oct 2026

Each month against that month’s active pool, so pool growth and rating drift both count.

How these comparisons are calculated

Chess67 calculations from the Oct 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.

United States statistics California statistics

Published ratings by month

P marks a provisional rating; the small figure is the change since the previous published observation.

Monthly USCF ratings for Rosenstock, Ephraim M
Month	Regular	Quick	Blitz	Online Regular	Online Quick	Online Blitz
Oct 2026	2,286-18	2,138-32	2,152+2	1,610 Pno change · 13 games	1,605 Pno change · 24 games	2,078 Pno change · 19 games
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

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