Sumida, Grant
Current rating: 1468
Record: 4-6
| Grand Prix Oakland 2010 (extended) | starting rating: 1523 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 192 | Hornung, David (1500) | Lost 0-2 | -181505 |
| 2extended | 301 | Sadd, Harrison (1500) | Lost 0-2 | -181487 |
| 3extended | 305 | Van Winkle, Chris (1464) | Lost 1-2 | -191468 |
| average opponent: 1488record: 0-3 | new rating: 1468 | |||
| Grand Prix Salt Lake City 2005 (Kamigawa block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 68 | Woodard, Eric (1500) | Won 2-1 | +181518 |
| 2block | 38 | Erwin, Adam (1482) | Won 2-0 | +171535 |
| 3block | 23 | Jayne, Brett (1536) | Won 2-0 | +181553 |
| 4block | 32 | Thompson, Gerry (1794) | Won 2-0 | +231576 |
| 5block | 4 | Cheon, Paul (1590) | Lost 0-2 | -181558 |
| 6block | 20 | Postlethwait, William (1641) | Lost 0-2 | -171541 |
| 7block | 44 | Hatfield, Ty (1535) | Lost 0-2 | -181523 |
| average opponent: 1582record: 4-3 | new rating: 1523 | |||