Mabbatt, Joe
Current rating: 1504
Record: 5-5
| Grand Prix Seattle-Tacoma 2012 (DKA limited) | starting rating: 1506 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 239 | Anderson, Andrew (1500) | Won 2-1 | +171523 |
| 2sealed | 125 | Adams, Brogan (1518) | Lost 1-2 | -181505 |
| 3sealed | 214 | Pierce, Drew (1501) | Won 2-1 | +181523 |
| 4sealed | 324 | Tuttle, Brad (1479) | Lost 1-2 | -191504 |
| average opponent: 1499record: 2-2 | new rating: 1504 | |||
| Grand Prix Portland 2010 (M11 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 307 | Pettinger, Kevin (1456) | Won 2-1 | +171517 |
| 2sealed | 203 | Shears, Brett (1706) | Won 2-0 | +221539 |
| 3sealed | 71 | Phelps, Michael (1665) | Lost 0-2 | -161523 |
| 4sealed | 376 | Konrady, Benjamin W (1615) | Won 2-0 | +201543 |
| 5sealed | 249 | Meyer, Mark (1460) | Lost 0-2 | -201523 |
| 6sealed | 230 | Moore, Aron (1550) | Lost 1-2 | -171506 |
| average opponent: 1575record: 3-3 | new rating: 1506 | |||