Roberts, Zachary L
Current rating: 1557
Record: 6-3
| Grand Prix San Francisco 2007 (Time Spiral block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 177 | Stevenson, Dale A (1500) | Won 2-1 | +181518 |
| 2block | 141 | Sherman, Sam (1518) | Lost 0-2 | -181500 |
| 3block | 139 | Wiser, Robert (1500) | Won 2-0 | +181518 |
| 4block | 194 | Cleary, Alexander W (1518) | Won 2-0 | +181536 |
| 5block | 80 | Edel, Willy (1752) | Won 2-1 | +221558 |
| 6block | 59 | Jen, Ivan (1539) | Won 2-0 | +181576 |
| 7block | 20 | Nguyen, James (1594) | Won 2-0 | +181594 |
| 8block | 8 | Chu, Gim (1582) | Lost 0-2 | -181576 |
| 9block | 53 | Brewer, Morgan T (1558) | Lost 0-0 | -191557 |
| average opponent: 1562record: 6-3 | new rating: 1557 | |||