Wins
61
Indexed tournament wins
Player record
Kostkowski, Betty
Losses
336
Indexed tournament losses
Matches
397
Decisive results
Win rate
15.4%
Across indexed matches
Peak rating
963
Highest rating in the available history.
Biggest upset
Summers, Dan
Maryland State Closed · Mar 24, 2001 · +989 rating
Open →Biggest loss
Doctolero, Jordan
Maryland May Circuit - Giant R · May 26, 2001 · -593 rating
Open →Most frequent opponent
Michael Branch
55 matches
Open →Rating trajectory
Published rating movement across recorded events.
Tournament history
61 tournament appearances · synced Aug 13, 2026, 2:38 AM
| Date | Tournament | Rating in | Rating after | Points changed | Record |
|---|---|---|---|---|---|
| Jan 11, 2004 | Maryland CircuitTournament · View matches | 501 | 505 | +4 | 1W / 6L |
| Oct 18, 2003 | Maryland Giant RRTournament · View matches | 481 | 501 | +20 | 2W / 3L |
| Sep 20, 2003 | Maryland Giant RRTournament · View matches | 489 | 481 | -8+0 / -8 | 0W / 5L |
| Jul 26, 2003 | Maryland Giant RRTournament · View matches | 519 | 489 | -30+0 / -30 | 0W / 8L |
| Jun 21, 2003 | Maryland Giant RRTournament · View matches | 555 | 519 | -36+1 / -37 | 1W / 5L |
| May 17, 2003 | Maryland Giant RRTournament · View matches | 544 | 555 | +11+20 / -9 | 3W / 5L |
| May 4, 2003 | Maryland CircuitTournament · View matches | 520 | 544 | +24+32 / -8 | 3W / 2L |
| Apr 6, 2003 | Maryland CircuitTournament · View matches | 507 | 520 | +13+23 / -10 | 2W / 3L |
| Mar 9, 2003 | Maryland CircuitTournament · View matches | 529 | 507 | -22+0 / -22 | 0W / 5L |
| Feb 22, 2003 | Maryland Giant RRTournament · View matches | 521 | 529 | +8+13 / -5 | 1W / 3L |
| Feb 9, 2003 | Maryland CircuitTournament · View matches | 528 | 521 | -7 | 0W / 4L |
| Oct 26, 2002 | Maryland Giant RRTournament · View matches | 550 | 528 | -22 | 0W / 5L |
| Aug 24, 2002 | Maryland Giant RRTournament · View matches | 575 | 550 | -25+0 / -25 | 0W / 11L |
| Jul 27, 2002 | Maryland Giant RRTournament · View matches | 604 | 575 | -29 | 1W / 7L |
| Jun 22, 2002 | Maryland Giant RRTournament · View matches | 605 | 604 | -1+8 / -9 | 2W / 8L |
| May 18, 2002 | Maryland Giant RRTournament · View matches | 566 | 605 | +39+40 / -1 | 2W / 3L |
| Apr 27, 2002 | Maryland State ClosedTournament · View matches | 573 | 566 | -7+0 / -7 | 0W / 4L |
| Mar 23, 2002 | Maryland Giant RRTournament · View matches | 567 | 573 | +6+14 / -8 | 2W / 7L |
| Feb 23, 2002 | Maryland Giant RRTournament · View matches | 590 | 567 | -23 | 2W / 9L |
| Dec 2, 2001 | Maryland December CircuitTournament · View matches | 607 | 590 | -17 | 0W / 6L |