Seidenberger, John
Current rating: 1479
Record: 4-6
| Grand Prix Austin 2004 (COK limited) | starting rating: 1489 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 41 | Livingston, Steven (1527) | Won 2-0 | +181507 |
| 5sealed | 20 | Jowers, Kenneth (1598) | Lost 1-2 | -161491 |
| 6sealed | 29 | Zajdner, Mark (1783) | Lost 0-2 | -131478 |
| 7sealed | 72 | Pence, Sammy (1504) | Won 2-1 | +191497 |
| 8sealed | 31 | Hansen, Kevin (1500) | Lost 1-2 | -181479 |
| average opponent: 1582record: 2-3 | new rating: 1479 | |||
| Grand Prix Kansas City 2003 (MRD limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 57 | Schmaltz, Matt (1615) | Won 2-0 | +201520 |
| 5sealed | 28 | Petersen, David (1616) | Lost 0-2 | -161504 |
| 6sealed | 66 | Kaskel, Brent (1501) | Won 2-1 | +181522 |
| 7sealed | 10 | Weeks, James (1589) | Lost 1-2 | -171505 |
| 8sealed | 59 | Rietzl, Paul (1592) | Lost 0-2 | -161489 |
| average opponent: 1583record: 2-3 | new rating: 1489 | |||