Katz, Billy
Current rating: 1498
Record: 3-3
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 198 | Johnson, James (1465) | Lost 0-2 | -191481 |
| 2sealed | 227 | Castillo-Vergara, Franklyn (1481) | Won 2-1 | +181499 |
| 3sealed | 243 | Mulrooney, Ryan P (1484) | Lost 0-2 | -181481 |
| 4sealed | 274 | Rider, Derek (1430) | Won 2-1 | +171498 |
| 5sealed | 182 | Crane, Patrick (1464) | Won 2-1 | +181516 |
| 6sealed | 148 | Peterson, Joe M (1519) | Lost 1-2 | -181498 |
| average opponent: 1474record: 3-3 | new rating: 1498 | |||