Wins
9
Indexed tournament wins
Player record
John Grinnell
Losses
16
Indexed tournament losses
Matches
25
Decisive results
Win rate
36.0%
Across indexed matches
Peak rating
987
Highest rating in the available history.
Biggest upset
Valarezo, Erick
1997 Florida Sunshine State Ga · May 18, 1997 · +588 rating
Open →Biggest loss
Not enough data
No qualifying loss available.
Most frequent opponent
Shahnasarian, Leon
2 matches
Open →Rating trajectory
Published rating movement across recorded events.
Tournament history
7 tournament appearances · synced Aug 8, 2026, 3:32 AM
| Date | Tournament | Rating in | Rating after | Points changed | Record |
|---|---|---|---|---|---|
| Jul 7, 2002 | 2002 U.S. OpenTournament · View matches | 987 | 982 | -5+0 / -5 | 0W / 2L |
| Dec 23, 2001 | 2001 USATT NationalsTournament · View matches | 972 | 987 | +15+15 / 0 | 4W / 1L |
| Jul 8, 2001 | 2001 US Open 3Tournament · View matches | 973 | 972 | -1+1 / -2 | 2W / 2L |
| Dec 17, 2000 | 2000 USATT National ChampionshipTournament · View matches | 973 | 973 | 0+0 / 0 | 0W / 1L |
| Jul 5, 1998 | 1998 US OpenTournament · View matches | 975 | 973 | -2+0 / -2 | 0W / 3L |
| May 18, 1997 | 1997 Florida Sunshine State GaTournament · View matches | 837 | 975 | +138 | 2W / 2L |
| Apr 6, 1997 | South Florida Spring Break OpeTournament · View matches · Initial rating 837 | Unrated | 837 | — | 1W / 5L |
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