Ullmann, Collin
Current rating: 1506
Record: 2-2
| Grand Prix Detroit 2013 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 177 | Chung, Brian T (1592) | Lost 1-2 | -161484 |
| 2modern | 410 | Eichenberg, William (1537) | Won 0-0 | +191503 |
| 3modern | 54 | Maurmeier, Ralph (1699) | Lost 1-2 | -151488 |
| 4modern | 181 | Zweifel, Josh J (1464) | Won 2-1 | +181506 |
| average opponent: 1573record: 2-2 | new rating: 1506 | |||