Wins
350
Indexed tournament wins
Player record
Hiroshi Koshimoto
Losses
981
Indexed tournament losses
Matches
1,331
Decisive results
Win rate
26.3%
Across indexed matches
Peak rating
1,672
Highest rating in the available history.
Biggest upset
Rowe, Larry
US Nationals · Dec 18, 1994 · +662 rating
Open →Biggest loss
Trudell, Robert
Colorado River Open · Mar 28, 1999 · -658 rating
Open →Most frequent opponent
Al Miller
9 matches
Open →Rating trajectory
Published rating movement across recorded events.
Tournament history
113 tournament appearances · synced Aug 8, 2026, 3:34 AM
| Date | Tournament | Rating in | Rating after | Points changed | Record |
|---|---|---|---|---|---|
| Aug 26, 2007 | Pacific Coast OpenTournament · View matches | 1,485 | 1,519 | +34+65 / -31 | 5W / 13L |
| Jul 7, 2007 | U.S. Open ChampionshipsTournament · View matches | 1,505 | 1,485 | -20+7 / -27 | 6W / 16L |
| Jul 1, 2007 | California State OpenTournament · View matches · USATT readjusted 1,362 → 1,513 | 1,362 | 1,505 | -8+70 / -78 | 5W / 15L |
| Jun 3, 2007 | Meiklejohn North American SeniTournament · View matches | 1,434 | 1,362 | -72+16 / -88 | 4W / 10L |
| Apr 10, 2007 | Golden Western OpenTournament · View matches | 1,404 | 1,434 | +30+47 / -17 | 5W / 15L |
| Mar 25, 2007 | The 2007 John Schneider MemoriTournament · View matches | 1,416 | 1,404 | -12+0 / -12 | 0W / 9L |
| Dec 16, 2006 | U.S. National ChampionshipsTournament · View matches | 1,575 | 1,416 | -159 | 3W / 13L |
| Aug 27, 2006 | Pacific Coast OpenTournament · View matches | 1,536 | 1,575 | +39+81 / -42 | 10W / 17L |
| Jul 8, 2006 | U.S. OpenTournament · View matches | 1,388 | 1,536 | +148 | 6W / 16L |
| Jun 25, 2006 | California State OpenTournament · View matches | 1,430 | 1,388 | -42 | 5W / 16L |
| Jun 4, 2006 | Meiklejohn North American SeniorsTournament · View matches | 1,482 | 1,430 | -52+1 / -53 | 3W / 8L |
| Mar 26, 2006 | Golden Western OpenTournament · View matches | 1,393 | 1,482 | +89 | 8W / 18L |
| Dec 17, 2005 | 2005 US Nationals ChampionshipTournament · View matches | 1,533 | 1,393 | -140 | 1W / 15L |
| Aug 28, 2005 | Pacific Coast OpenTournament · View matches | 1,510 | 1,533 | +23+83 / -60 | 6W / 7L |
| Jul 10, 2005 | US OpenTournament · View matches | 1,489 | 1,510 | +21+68 / -47 | 6W / 15L |
| Jun 26, 2005 | California OpenTournament · View matches | 1,454 | 1,489 | +35+76 / -41 | 6W / 16L |
| Jun 5, 2005 | Meiklejohn National Seniors OpTournament · View matches | 1,489 | 1,454 | -35+26 / -61 | 5W / 9L |
| Mar 27, 2005 | Golden Western StatesTournament · View matches | 1,487 | 1,489 | +2+77 / -75 | 6W / 10L |
| Feb 20, 2005 | Lechi/West Covina TTC OpenTournament · View matches | 1,575 | 1,487 | -88 | 5W / 13L |
| Jan 29, 2005 | Power Pong January OpenTournament · View matches | 1,477 | 1,575 | +98 | 4W / 7L |
1–20 of 113
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