Wins
11
Indexed tournament wins
Player record
Peterkin, William
Losses
5
Indexed tournament losses
Matches
16
Decisive results
Win rate
68.8%
Across indexed matches
Peak rating
604
Highest rating in the available history.
Biggest upset
Chapman, Sean
New York State Open Junior Cha · Jun 9, 2007 · +234 rating
Open →Biggest loss
Not enough data
No qualifying loss available.
Most frequent opponent
Cuartas, Kevin
3 matches
Open →Rating trajectory
Published rating movement across recorded events.
Tournament history
3 tournament appearances · synced Aug 9, 2026, 2:32 AM
| Date | Tournament | Rating in | Rating after | Points changed | Record |
|---|---|---|---|---|---|
| Apr 19, 2008 | New York State Open Junior ChampionshipTournament · View matches | 601 | 604 | +3 | 1W / 4L |
| Jun 9, 2007 | New York State Open Junior ChaTournament · View matches | 513 | 601 | +88 | 4W / 0L |
| Feb 17, 2007 | Long Island Open Junior ChampiTournament · View matches · Initial rating 513 | Unrated | 513 | — | 6W / 1L |
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