Wins
46
Indexed tournament wins
Player record
Kenneth P. Costa
Losses
51
Indexed tournament losses
Matches
97
Decisive results
Win rate
47.4%
Across indexed matches
Peak rating
1,560
Highest rating in the available history.
Biggest upset
Farhang Ebadypour
US Nationals · Dec 19, 1999 · +264 rating
Open →Biggest loss
Kim Halliday
Waltham February Open RR · Feb 23, 1997 · -187 rating
Open →Most frequent opponent
Doug Pryce
3 matches
Open →Rating trajectory
Published rating movement across recorded events.
Tournament history
12 tournament appearances · synced Aug 26, 2026, 2:25 AM
| Date | Tournament | Rating in | Rating after | Points changed | Record |
|---|---|---|---|---|---|
| Mar 11, 2007 | 2007 Gate City OpenTournament · View matches | 1,544 | 1,560 | +16 | 7W / 1L |
| Feb 18, 2007 | New Hampshire RR OpenTournament · View matches | 1,514 | 1,544 | +30+35 / -5 | 1W / 4L |
| Dec 19, 1999 | US NationalsTournament · View matches · USATT readjusted 1,359 → 1,442 | 1,359 | 1,514 | +72+87 / -15 | 7W / 8L |
| Oct 23, 1999 | Vermont October Open Giant RRTournament · View matches | 1,386 | 1,359 | -27 | 1W / 5L |
| Mar 7, 1999 | 1999 New Hampshire RR OpenTournament · View matches | 1,399 | 1,386 | -13+10 / -23 | 1W / 6L |
| Jan 11, 1998 | 1998 New Hampshire RR OpenTournament · View matches | 1,406 | 1,399 | -7 | 2W / 4L |
| Nov 15, 1997 | 1997 MIT OpenTournament · View matches | 1,398 | 1,406 | +8+8 / 0 | 3W / 0L |
| Nov 2, 1997 | Bay State 1997 Giant RRTournament · View matches | 1,388 | 1,398 | +10+58 / -48 | 5W / 5L |
| Mar 30, 1997 | Waltham March OpenTournament · View matches | 1,373 | 1,388 | +15+25 / -10 | 1W / 7L |
| Feb 23, 1997 | Waltham February Open RRTournament · View matches | 1,323 | 1,373 | +50 | 9W / 6L |
| Oct 27, 1996 | Waltham October Open RRTournament · View matches | 1,369 | 1,323 | -46+5 / -51 | 2W / 2L |
| Jul 7, 1996 | 1996 US OpenTournament · View matches · Initial rating 1,369 | Unrated | 1,369 | — | 7W / 3L |
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