Erwin, Joshua
Current rating: 1430
Record: 3-7
| Grand Prix Phoenix 2018 (modern) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 368 | Webster, Noah (1500) | Lost 0-2 | -171446 |
| 2modern | 378 | Hommy, Ori (1474) | Lost 0-2 | -181428 |
| 3modern | 581 | Stewart, Victory (1464) | Won 2-1 | +191447 |
| 4modern | 444 | Ladner, Jacob (1492) | Won 1-0 | +191466 |
| 5modern | 489 | Kirkpatrick, Greg (1447) | Lost 1-2 | -191447 |
| 6modern | 457 | Eastin, Seth (1486) | Lost 0-2 | -171430 |
| average opponent: 1477record: 2-4 | new rating: 1430 | |||
| Grand Prix Denver 2011 (MBS limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 134 | Eliason, William (1500) | Won 2-0 | +181518 |
| 2sealed | 89 | Raun, Jeffrey (1500) | Lost 0-2 | -181500 |
| 3sealed | 122 | Bellio, Brent (1466) | Lost 0-2 | -191481 |
| 4sealed | 136 | Nelson, John R (1482) | Lost 0-2 | -181463 |
| average opponent: 1487record: 1-3 | new rating: 1463 | |||