Markwith, Kenneth
Current rating: 1403
Record: 9-17
| Grand Prix Orlando 2017 (AER limited) | starting rating: 1402 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 911 | Shipman, Stephen (1392) | Won 2-1 | +181420 |
| 2sealed | 582 | Wells, John F (1500) | Lost 1-2 | -171403 |
| 3sealed | 914 | Culotta, Martin (1526) | Won 2-1 | +201423 |
| 4sealed | 826 | Beeghly, Devin (1571) | Lost 1-2 | -151408 |
| 5sealed | 1005 | Nguyen, Minh (1608) | Lost 0-2 | -141394 |
| 6sealed | 1035 | Sullivan, Craig (1450) | Won 2-1 | +191413 |
| 7sealed | 888 | Wellinger, Serafin (1910) | Lost 0-2 | -101403 |
| top | average opponent: 1565record: 3-4 | new rating: 1403 | ||
| Grand Prix Atlanta 2016 (KLD limited) | starting rating: 1397 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 906 | Patel, Karan (1566) | Lost 1-2 | -151382 |
| 2sealed | 1099 | Armstrong, Lance (1488) | Won 2-0 | +201402 |
| 3sealed | 1007 | Hagman, Aaron (1481) | Won 2-0 | +191421 |
| 4sealed | 784 | Lanceford, Graham (1690) | Lost 1-2 | -131408 |
| 5sealed | 1099 | Waller, Phillip (1455) | Won 2-0 | +191427 |
| 6sealed | 800 | Perez Jr., Raymond (1818) | Lost 0-2 | -111416 |
| 7sealed | 1017 | Pendergast, Thomas (1645) | Lost 0-2 | -141402 |
| top | average opponent: 1592record: 3-4 | new rating: 1402 | ||
| Grand Prix Atlanta 2011 (extended) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 488 | Frederick, Ray R (1520) | Lost 1-2 | -171429 |
| 2extended | 573 | Bates, Daniel A (1482) | Lost 1-2 | -171412 |
| 3extended | 616 | Lanzo, Nic J (1445) | Won 2-0 | +191431 |
| 4extended | 620 | Clary, Kenneth (1491) | Lost 1-2 | -171414 |
| 5extended | 648 | Rarie, Calvin (1465) | Lost 1-2 | -171397 |
| top | average opponent: 1481record: 1-4 | new rating: 1397 | ||
| Grand Prix Atlanta 2008 (ALA limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 113 | Izsak, Gabby (1500) | Lost 1-2 | -181482 |
| 2sealed | 185 | Paumgardhen, Ian (1482) | Lost 0-2 | -181464 |
| 3sealed | 269 | Graham, Chelsea (1464) | Won 2-0 | +181482 |
| 4sealed | 255 | Bollinger, Ian (1482) | Won 2-1 | +181500 |
| 5sealed | 180 | Childs, Ryan (1500) | Lost 0-2 | -181482 |
| 6sealed | 193 | Parker, James R (1481) | Lost 1-2 | -181464 |
| 7sealed | 171 | Lanceford, Vincent (1465) | Lost 1-2 | -181446 |
| top | average opponent: 1482record: 2-5 | new rating: 1446 | ||