Roberts, William E
Current rating: 1525
Record: 8-7
| Grand Prix Philadelphia 2012 (RTR limited) | starting rating: 1499 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 107 | Mcnally, Kevin P (1500) | Lost 1-2 | -181481 |
| 2sealed | 327 | Williams, Stephen M (1483) | Lost 1-2 | -181463 |
| 3sealed | 407 | Crossey, Jim (1467) | Won 2-0 | +181481 |
| 4sealed | 350 | Watkins, Delmar (1485) | Won 2-0 | +181499 |
| 5sealed | 277 | Cholewa, Marius (1447) | Won 2-1 | +171516 |
| 6sealed | 256 | Castro Mahoney, Roberto (1643) | Won 2-1 | +211537 |
| 7sealed | 138 | Krempels, Craig (1988) | Won 2-0 | +251562 |
| 8sealed | 65 | Rapp, Nicholas (1568) | Lost 0-2 | -181544 |
| 9sealed | 122 | Herr, Briana (1436) | Lost 0-2 | -191525 |
| average opponent: 1557record: 5-4 | new rating: 1525 | |||
| Grand Prix Montreal 2011 (M12 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 128 | Whitsitt, Ryan (1500) | Lost 0-2 | -181482 |
| 2sealed | 223 | Simard, Stephane (1445) | Won 2-0 | +171499 |
| 3sealed | 86 | Robitaille, Guillaume (1500) | Lost 1-2 | -181481 |
| 4sealed | 202 | Perry, Lyndon (1482) | Lost 0-2 | -181463 |
| 5sealed | 224 | Fallarme, Mark (1465) | Won 2-1 | +181481 |
| 6sealed | 165 | Iler, Ryan (1469) | Won 2-1 | +181499 |
| average opponent: 1477record: 3-3 | new rating: 1499 | |||