Petersen, Steven A
Current rating: 1485
Record: 3-4
| Grand Prix Minneapolis 2009 (ZEN limited) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 90 | Fredrickson, Josh (1499) | Won 2-0 | +181501 |
| 2sealed | 33 | Marquis, Dustin (1604) | Lost 0-2 | -161485 |
| average opponent: 1552record: 1-1 | new rating: 1485 | |||
| Grand Prix Chicago 2009 (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 301 | Lewandowski, Jeremy (1500) | Won 2-0 | +181518 |
| 3legacy | 141 | Steadman, Pete J (1534) | Won 2-1 | +181536 |
| 4legacy | 28 | Elias, Matthew H (1588) | Lost 0-2 | -171519 |
| 5legacy | 150 | Johnson, Peter J (1536) | Lost 0-2 | -171502 |
| 6legacy | 328 | Weihe, Sean (1474) | Lost 0-2 | -191483 |
| average opponent: 1526record: 2-3 | new rating: 1483 | |||