Wins
232
Indexed tournament wins
Player record
Sean Koster
Losses
316
Indexed tournament losses
Matches
548
Decisive results
Win rate
42.3%
Across indexed matches
Peak rating
1,907
Highest rating in the available history.
Biggest upset
Connell, Grant
2017 Arizona Open & Giant RR · Feb 18, 2017 · +529 rating
Open →Biggest loss
Shikhare, Rudra
North-West La Open 2** Sanctioned Tournament · Nov 18, 2018 · -601 rating
Open →Most frequent opponent
Mike Burg
13 matches
Open →Rating trajectory
Published rating movement across recorded events.
Tournament history
62 tournament appearances · synced Aug 7, 2026, 8:40 PM
| Date | Tournament | Rating in | Rating after | Points changed | Record |
|---|---|---|---|---|---|
| Nov 3, 2019 | 2019 TT&M Spooky OpenTournament · View matches | 1,882 | 1,753 | -129+3 / -132 | 8W / 8L |
| Sep 28, 2019 | LATTA Open September 2019Tournament · View matches | 1,907 | 1,876 | -31+1 / -32 | 1W / 5L |
| Sep 28, 2019 | 2019 Best of the West OpenTournament · View matches | 1,876 | 1,882 | +6+11 / -5 | 2W / 1L |
| Sep 8, 2019 | 2019 TT&M September RRTournament · View matches · USATT readjusted 1,730 → 1,884 | 1,730 | 1,907 | +23+32 / -9 | 6W / 2L |
| Aug 24, 2019 | LATTA Open August 2019Tournament · View matches | 1,701 | 1,730 | +29+50 / -21 | 1W / 8L |
| Jul 27, 2019 | 2019 Arizona Sizzler OpenTournament · View matches | 1,699 | 1,701 | +2+4 / -2 | 2W / 4L |
| Jun 30, 2019 | 2019 US NationalsTournament · View matches | 1,672 | 1,699 | +27+65 / -38 | 9W / 16L |
| May 18, 2019 | 2019 Arizona Closed (AZ State Championship)Tournament · View matches | 1,644 | 1,672 | +28+49 / -21 | 8W / 8L |
| Apr 6, 2019 | 2019 TT&M April Team OpenTournament · View matches | 1,720 | 1,644 | -76+3 / -79 | 6W / 10L |
| Mar 2, 2019 | 2019 Arizona Open & Giant Round RobinTournament · View matches | 1,703 | 1,720 | +17+42 / -25 | 7W / 6L |
| Jan 27, 2019 | 2019 TT&M Royal Rumble Tournament · View matches | 1,723 | 1,703 | -20+2 / -22 | 3W / 5L |
| Dec 8, 2018 | 2018 Valley of the Sun OpenTournament · View matches | 1,722 | 1,723 | +1+2 / -1 | 1W / 2L |
| Nov 18, 2018 | North-West La Open 2** Sanctioned TournamentTournament · View matches | 1,812 | 1,722 | -90+2 / -92 | 4W / 5L |
| Oct 27, 2018 | Westchester October 2018 OpenTournament · View matches · USATT readjusted 1,695 → 1,757 | 1,695 | 1,812 | +55+58 / -3 | 2W / 6L |
| Sep 29, 2018 | 2018 Best of the West OpenTournament · View matches | 1,695 | 1,695 | 0+0 / 0 | 0W / 3L |
| Sep 1, 2018 | 2018 JOOLA LA Open TournamentTournament · View matches | 1,699 | 1,695 | -4+53 / -57 | 2W / 6L |
| Jul 28, 2018 | 2018 Arizona Sizzler OpenTournament · View matches | 1,730 | 1,699 | -31+13 / -44 | 4W / 8L |
| Jul 2, 2018 | US Nationals Tournament · View matches | 1,686 | 1,730 | +44+105 / -61 | 8W / 9L |
| Jun 10, 2018 | 2018 TT&M JUNE ROUND ROBINTournament · View matches | 1,653 | 1,686 | +33+35 / -2 | 3W / 5L |
| May 12, 2018 | San Diego Open 10K TournamentTournament · View matches | 1,669 | 1,653 | -16+0 / -16 | 0W / 6L |