Costello, Anthony
Current rating: 1404
Record: 4-10
| Grand Prix Seattle 2019 (MH1 limited) | starting rating: 1453 | |||
| round | table | opponent (rating) | result | Δrating |
| A1sealed | 419 | Meinershagen, Riley (1440) | Lost 0-2 | -181435 |
| A2sealed | 538 | Cole, Michael (1509) | Lost 0-2 | -171418 |
| A3sealed | 450 | Herzog, Cameron (1601) | Lost 1-2 | -141404 |
| top | average opponent: 1517record: 0-3 | new rating: 1404 | ||
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1450 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 57 | Simoneau, Danny R (1538) | Won 2-0 | +201470 |
| 3sealed | 40 | Ledford, Mitchell (1484) | Lost 1-2 | -181452 |
| 4sealed | 184 | Williams, Justin (1469) | Won 2-0 | +181470 |
| 5sealed | 64 | Roman, Andrew (1536) | Lost 1-2 | -171453 |
| top | average opponent: 1507record: 2-2 | new rating: 1453 | ||
| Grand Prix Boston 2005 (extended) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 134 | Kowal, Brian (1561) | Lost 0-2 | -171447 |
| 2extended | 254 | Denham, Matthew (1482) | Won 2-1 | +191466 |
| 3extended | 142 | Badillo, Rogelio (1567) | Lost 0-2 | -161450 |
| top | average opponent: 1537record: 1-2 | new rating: 1450 | ||
| Grand Prix Boston 2003 (LGN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 177 | Sherman, Aaron (1500) | Won 2-1 | +181518 |
| 2sealed | 106 | Melillo, Mario (1499) | Lost 1-2 | -181500 |
| 3sealed | 140 | Mackenzie, Andrei (1500) | Lost 0-2 | -181482 |
| 4sealed | 211 | Pastore, Mateo (1482) | Lost 1-2 | -181464 |
| top | average opponent: 1495record: 1-3 | new rating: 1464 | ||