USCF player statistics

Yoo, Christopher Woojin

USCF 15244943CaliforniaUpdated: Oct 2026
Official US Chess record

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Gender
Male
FIDE title
G
FIDE
FIDE 30909694
US Chess reported rank
#26 national · #4 in state
Floor
Regular 2,200 · Quick 1,900 · Blitz 2,100 · Online Regular 2,100 · Online Quick 2,100 · Online Blitz 2,100

US Chess record as of Sep 15, 2026

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Rating format

Regular rating

2,640-20 since Sep 2026

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

Oct 20262,640 Regular
Dec 2025: 2662Jan 2026: 2662Feb 2026: 2662Mar 2026: 2665Apr 2026: 2667May 2026: 2663Jun 2026: 2657Jul 2026: 2665Aug 2026: 2667Sep 2026: 2660Oct 2026: 2640
Dec 2025Oct 2026
11 updates in this window · -22 first to last · open points are provisional · guides mark US Chess classes · unpublished months are skipped, not inactivity
Overlays their published ratings on the chart; the link keeps the comparison.

Other formats against Regular

  • -452 Quick vs Regular

    No national baseline for this rating band yet.

  • -86 Blitz vs Regular

    No national baseline for this rating band yet.

  • -47 Online Regular vs Regular

    No national baseline for this rating band yet.

  • -270 Online Quick vs Regular

    No national baseline for this rating band yet.

  • -224 Online Blitz vs Regular

    No national baseline for this rating band yet.

How this rating moves

Between consecutive published observations, provisional included.

Biggest gain
+8
Jun 2026 to Jul 2026
Biggest drop
-20
Sep 2026 to Oct 2026
Longest rise
2 updates
+10 from Jun 2026 to Aug 2026
Updates that moved
8 of 10
Latest -20, Sep 2026 to Oct 2026
Typical move
±5
Mean absolute change; spread ±7.7

Regular rating in context

Oct 2026 update

United States

#30of 82,596 rated members · higher than 99.9%

82,566 lower · 1 same rating · 29 higher · ties share a rank

California

#4of 9,083 rated members · higher than 99.9%

9,079 lower · 1 same rating · 3 higher · ties share a rank

Where this rating sits · United States

82,596 rated members in 50-point bands · median 800–849 · 82 within 100 points of 2,640 (this player included)

Player · 2,640
01,4502,900

2,600–2,649: 23 members (0%) · highlighted band is the player’s · dashed line is the target

99.9% below 2,650 (82,570 of 82,596; 99.9% below 2,640)

Percentile over time · United States

99.9% higher than · Oct 2026 · rank #30 of 82,596

Since Dec 2025
0 pts

Dec 2025: higher than 99.9% (rank 23 of 81,102)Jan 2026: higher than 99.9% (rank 23 of 79,487)Feb 2026: higher than 99.9% (rank 23 of 83,940)Mar 2026: higher than 99.9% (rank 22 of 80,605)Apr 2026: higher than 99.9% (rank 23 of 80,831)May 2026: higher than 99.9% (rank 25 of 81,236)Jun 2026: higher than 99.9% (rank 28 of 83,290)Jul 2026: higher than 99.9% (rank 24 of 82,736)Aug 2026: higher than 99.9% (rank 24 of 83,080)Sep 2026: higher than 99.9% (rank 26 of 83,635)Oct 2026: higher than 99.9% (rank 30 of 82,596)
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 Yoo, Christopher Woojin
MonthRegularQuickBlitzOnline RegularOnline QuickOnline Blitz
Oct 20262,640-202,188no change2,554no change2,593no change2,370no change2,416no change
Sep 20262,660-72,188no change2,554-32,593no change2,370no change2,416no change
Aug 20262,667+22,188no change2,557+22,593no change2,370no change2,416no change
Jul 20262,665+82,188no change2,555+222,593no change2,370no change2,416no change
Jun 20262,657-62,188+422,533no change2,593no change2,370no change2,416no change
May 20262,663-42,146no change2,533+12,593no change2,370no change2,416no change
Apr 20262,667+22,146+512,532+92,593no change2,370no change2,416no change
Mar 20262,665+32,095+372,523+52,593no change2,370no change2,416no change
Feb 20262,662no change2,058no change2,518no change2,593no change2,370no change2,416no change
Jan 20262,662no change2,058no change2,518no change2,593no change2,370no change2,416no change
Dec 20252,6622,0582,5182,5932,3702,416
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About these statistics. Built from the monthly USCF rating updates available to Chess67. Ratings change between publications, and a missing month is not inactivity. The official US Chess record has current ratings and tournament history.