Powell, John A
Current rating: 1464
Record: 1-3
| Grand Prix Washington DC 2010 (ROE standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 49 | Mathis, Jason D (1500) | Won 2-1 | +181518 |
| 2standard | 161 | Neitzelt, Nicholas (1518) | Lost 0-2 | -181500 |
| 3standard | 175 | Giaquinto, Frank (1519) | Lost 0-2 | -181482 |
| 4standard | 350 | Mccullough, Matthew (1482) | Lost 0-2 | -181464 |
| average opponent: 1505record: 1-3 | new rating: 1464 | |||