Grollman, Joseph L
Current rating: 1481
Record: 6-7
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1517 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 432 | Droggitis, Dustin (1462) | Won 2-1 | +171534 |
| 3sealed | 526 | Leavitt, David (1537) | Lost 1-2 | -181516 |
| 4sealed | 614 | Patelakis, Steve (1576) | Lost 0-2 | -171499 |
| 5sealed | 656 | Hsu, Mike (1509) | Lost 1-2 | -181481 |
| average opponent: 1521record: 1-3 | new rating: 1481 | |||
| Grand Prix Columbus 2007 (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 65 | Johnston, Vincent (1500) | Won 2-0 | +181518 |
| 2legacy | 144 | Lepage, Brandon (1482) | Lost 0-2 | -191499 |
| 3legacy | 239 | rawson, buddy (1500) | Lost 0-2 | -181481 |
| 4legacy | 330 | Selivorstov, Nikita (1481) | Lost 1-2 | -181463 |
| 5legacy | 352 | Hawkins, Chris (1464) | Won 2-0 | +181481 |
| 6legacy | 314 | Colina, Carlos D (1480) | Won 2-0 | +181499 |
| 7legacy | 234 | Uhler, Adam (1499) | Lost 0-2 | -181481 |
| 8legacy | 219 | Williams, Joshua A (1480) | Won 2-0 | +181499 |
| 9legacy | 168 | Sorensen, Allen R (1470) | Won 2-1 | +181517 |
| average opponent: 1484record: 5-4 | new rating: 1517 | |||