USCF player statistics
Ganderia, Rosbe
Official US Chess recordRegular rating
Published rating · Sep 2026 · 10 published updates since Dec 2025
Other formats against Regular
+9 Quick vs Regular
No national baseline for this rating band yet.
-443 Online Quick vs Regular (provisional)
No national baseline for this rating band yet.
How this rating moves
Between consecutive published observations, provisional included.
- Biggest gain
- +1
- Jan 2026 to Feb 2026
- Biggest drop
- -1
- Feb 2026 to Mar 2026
- Longest rise
- 1 update
- +1 from Jan 2026 to Feb 2026
- Current run
- 6 updates
- Unchanged since Mar 2026
- Typical move
- ±0
- Mean absolute change; spread ±0.5
Regular rating in context
United States
38.8%of the comparison population has a lower rating.
32,485 lower · 54 same rating · 51,096 higher
Where this rating sits · United States
83,635 rated members in 50-point bands · median 800–849 · 10,295 within 100 points of 643
600–649: 2,641 members (3.1%) · highlighted band is the player’s · dashed line is the target
39.2% below 650 (32,836 of 83,635; 38.8% below 643)
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 | Online Quick |
|---|---|---|---|
| Sep 2026 | 643no change | 652no change | 200 Pno change · 16 games |
| Aug 2026 | 643no change | 652no change | 200 Pno change · 16 games |
| Jul 2026 | 643no change | 652no change | 200 Pno change · 16 games |
| Jun 2026 | 643no change | 652no change | 200 Pno change · 16 games |
| May 2026 | 643no change | 652no change | 200 Pno change · 16 games |
| Apr 2026 | 643no change | 652no change | 200 Pno change · 16 games |
| Mar 2026 | 643-1 | 652no change | 200 Pno change · 16 games |
| Feb 2026 | 644+1 | 652no change | 200 Pno change · 16 games |
| Jan 2026 | 643no change | 652no change | 200 Pno change · 16 games |
| Dec 2025 | 643 | 652 | 200 P16 games |