Guth, Mark c
Current rating: 1506
Record: 3-3
| Grand Prix Seattle 2009 (ARB standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 231 | Horlacher, Travis (1518) | Won 2-1 | +181518 |
| 3standard | 20 | Jones, Glenn (1618) | Lost 1-2 | -161502 |
| 4standard | 162 | Alvarado, Joel (1513) | Lost 0-2 | -181484 |
| 5standard | 266 | Baboussis, George (1474) | Won 2-0 | +181502 |
| 6standard | 238 | Schomburg, Dan (1544) | Won 2-0 | +191521 |
| 7standard | 138 | Yu, Jarvis (1697) | Lost 0-2 | -151506 |
| average opponent: 1560record: 3-3 | new rating: 1506 | |||