Ernst, John
Current rating: 1492
Record: 3-4
| Grand Prix Detroit 2019 (M20 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 91 | Fisher, Matt 900 (1500) | Won 2-0 | +181518 |
| 2sealed | 56 | Cripps, Alex (1554) | Won 2-0 | +191537 |
| 3sealed | 83 | Strausman, Shea (1670) | Lost 0-2 | -161521 |
| 4sealed | 186 | Naylor, Andrew (1743) | Lost 1-2 | -141507 |
| 5sealed | 208 | Wagner, Bob (1586) | Won 2-1 | +191526 |
| 6sealed | 150 | Heskett, Jarrod (1630) | Lost 0-2 | -161510 |
| 7sealed | 168 | Galloway, Heidi (1463) | Lost 1-2 | -181492 |
| average opponent: 1592record: 3-4 | new rating: 1492 | |||