Duncan, Charles
Current rating: 1396
Record: 0-6
| Grand Prix Oklahoma City 2017 (modern) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 323 | Perry, Eddie (1445) | Lost 0-2 | -181428 |
| 3modern | 408 | Dillon, Kyle (1500) | Lost 0-2 | -171411 |
| 4modern | 524 | Rice, Remington (1560) | Lost 0-2 | -151396 |
| average opponent: 1501record: 0-3 | new rating: 1396 | |||
| Grand Prix Oklahoma City 2013 (THS limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 186 | Richardson, Alex (1500) | Lost 0-2 | -181482 |
| 2sealed | 481 | Woodward, Brent (1482) | Lost 0-2 | -181464 |
| 3sealed | 569 | Granzyk, Steve (1464) | Lost 0-2 | -181446 |
| average opponent: 1482record: 0-3 | new rating: 1446 | |||