Sumsky, Stefan
Current rating: 1554
Record: 6-3
| Grand Prix Boston-Worcester 2012 (M13 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 459 | Ryan, Matt V (1500) | Won 2-0 | +181518 |
| 2sealed | 188 | DeRoche, Chris (1631) | Won 2-0 | +201538 |
| 3sealed | 43 | Droggitis, Dustin (1519) | Lost 0-2 | -181520 |
| 4sealed | 255 | Pelletier, Jared (1449) | Won 2-0 | +161536 |
| 5sealed | 375 | Schibanoff, Justin (1495) | Lost 0-2 | -181518 |
| 6sealed | 280 | Barrette, Julien (1560) | Won 2-0 | +181536 |
| 7sealed | 323 | Tyson, Bryant (1512) | Won 2-0 | +181554 |
| 8sealed | 223 | Avilla, Anthony (1552) | Lost 0-2 | -181536 |
| 9sealed | 206 | Santone, Gregory (1540) | Won 2-0 | +181554 |
| average opponent: 1529record: 6-3 | new rating: 1554 | |||