Format
HS
Hemlock, Sebastian Koh
🇺🇸FIDE 39952282· Male· United States of America· Born in 2011
Follow Sebastian Koh HemlockTrack his monthly FIDE ratings, games, tournaments and more.
Sebastian Koh Hemlock, a 15-year-old American player, is rated 1630 — his current career high. He plays occasionally (9 games in the last 12 months). Recent standard appearances include 2026 April Marshall Premier FIDE - U2000, 56th Annual National Chess Congress - U2000, and 56th Annual National Chess Congress - U2200. Also played 2 blitz events (including Marshall FIDE Blitz 57) recently.
Current rating
1630
Standard
Rpd—·Blz1792
All-time high
1630
at best
May 2026 · age 15
May 2026 · age 15
Activity
12
games / yr avg. · ≈1/mo
9 past 12 mo · ≈1/mo
classical only
Moderately active
classical only
Moderately active
Signature stat
#135,168
#135,168 · players worldwide · of 216,808
Career timeline
5 entries2026
All-time peak 1630
at age 15
May 2026
Crossed 1600
at age 15
Jan 2026
Crossed 1500
at age 15
Jan 2026
Crossed 1400
at age 15
Jan 2026
First FIDE rating
1614 · at age 15
Jan 2026
Standard rating history
Last 12 months — activity & highlights
Top opponent
Evolution
—
Tournaments
3
14 games
Score
6.5/ 1446.4%
5W4D5L
Top 3 wins
Top 3 losses
Last 12 months — tournaments
3 events| Event | Date | Score | Rank | Perf | Δ Elo |
|---|---|---|---|---|---|
Open Swiss | Apr 2026 | 1.5/2 | #29 | 1782 | +17.2 |
Open Swiss | Nov 2025 | 2.5/3 | #75 | 1491 | 0.0 |
Open Swiss | Nov 2025 | 2.5/3 | #73 | 1491 | 0.0 |
Hot streak: 3 tournaments without losing Elo.
Rankings
/
United States of America
#4,023
out of 5,412 players
Americas
#16,641
in continent
World
#135,160
out of 400,000+
National ranking
Europe & World
Europe
World
United States of America
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| ... | ||
| 4023 | 1,630 | |
Americas
| 1 | 🇺🇸Follow Hikaru NakamuraTrack their monthly FIDE ratings, games, tournaments and more. | 2,792 |
| 2 | 🇺🇸Follow Fabiano CaruanaTrack their monthly FIDE ratings, games, tournaments and more. | 2,788 |
| 3 | 🇺🇸Follow Wesley SoTrack their monthly FIDE ratings, games, tournaments and more. | 2,754 |
| 4 | 🇺🇸Follow Leinier Dominguez PerezTrack their monthly FIDE ratings, games, tournaments and more. | 2,732 |
| 5 | 🇺🇸Follow Hans Moke NiemannTrack their monthly FIDE ratings, games, tournaments and more. | 2,728 |
| 6 | 🇺🇸Follow Levon AronianTrack their monthly FIDE ratings, games, tournaments and more. | 2,724 |
| 7 | 🇺🇸Follow Awonder LiangTrack their monthly FIDE ratings, games, tournaments and more. | 2,718 |
| 8 | 🇺🇸Follow Samuel SevianTrack their monthly FIDE ratings, games, tournaments and more. | 2,696 |
| 9 | 🇺🇸Follow Jeffery XiongTrack their monthly FIDE ratings, games, tournaments and more. | 2,656 |
| 10 | 🇺🇸Follow Ray RobsonTrack their monthly FIDE ratings, games, tournaments and more. | 2,653 |
| ... | ||
| 16641 | 1,630 | |
World
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| 9 | 🇺🇸Follow Wesley SoTrack their monthly FIDE ratings, games, tournaments and more. | 2,754 |
| 10 | 🇨🇳Follow Yi WeiTrack their monthly FIDE ratings, games, tournaments and more. | 2,753 |
| ... | ||
| 135160 | 1,630 | |