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 |
|---|---|---|---|---|---|
| Apr 28, 2007 | Maryland Giant RRTournament · View matches | 429 | 436 | +7+8 / -1 | 3W / 3L |
| Apr 15, 2007 | Maryland CircuitTournament · View matches | 450 | 429 | -21 | 2W / 4L |
| Mar 24, 2007 | Maryland Giant RRTournament · View matches | 444 | 450 | +6+6 / 0 | 1W / 8L |
| Mar 4, 2007 | Maryland CircuitTournament · View matches | 466 | 444 | -22+4 / -26 | 1W / 3L |
| Aug 26, 2006 | Maryland Giant RRTournament · View matches | 433 | 466 | +33+35 / -2 | 3W / 6L |
| Feb 25, 2006 | Maryland Giant RRTournament · View matches | 445 | 433 | -12+0 / -12 | 0W / 8L |
| Nov 19, 2005 | Maryland Giant RRTournament · View matches | 444 | 445 | +1+6 / -5 | 1W / 11L |
| Oct 29, 2005 | Maryland Giant RRTournament · View matches | 456 | 444 | -12+0 / -12 | 0W / 9L |
| May 21, 2005 | Maryland Giant RRTournament · View matches | 468 | 456 | -12 | 2W / 6L |
| May 15, 2005 | Maryland CircuitTournament · View matches | 439 | 468 | +29+32 / -3 | 2W / 4L |
| Mar 19, 2005 | Maryland Giant RRTournament · View matches | 445 | 439 | -6+0 / -6 | 0W / 5L |
| Sep 18, 2004 | Maryland Giant RRTournament · View matches | 455 | 445 | -10+0 / -10 | 0W / 8L |
| Sep 5, 2004 | Maryland CircuitTournament · View matches | 444 | 455 | +11 | 2W / 3L |
| Aug 21, 2004 | Maryland Giant RRTournament · View matches | 451 | 444 | -7+0 / -7 | 0W / 10L |
| Jul 24, 2004 | Maryland Giant RRTournament · View matches | 459 | 451 | -8+0 / -8 | 0W / 9L |
| May 15, 2004 | Maryland Giant RRTournament · View matches | 478 | 459 | -19 | 1W / 9L |
| May 2, 2004 | Maryland CircuitTournament · View matches | 494 | 478 | -16+0 / -16 | 0W / 6L |
| Mar 20, 2004 | Maryland Giant RRTournament · View matches | 510 | 494 | -16+0 / -16 | 0W / 6L |
| Mar 7, 2004 | Maryland CircuitTournament · View matches | 497 | 510 | +13 | 2W / 2L |
| Feb 21, 2004 | Maryland Giant RRTournament · View matches | 505 | 497 | -8+0 / -8 | 0W / 9L |
1–20 of 61
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