Kosierowski, Johnathan
Current rating: 1430
Record: 2-6
| Grand Prix Phoenix 2018 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 427 | Avila, Anthony (1500) | Lost 0-2 | -181482 |
| 2modern | 357 | Ross, Skyler (1506) | Lost 0-2 | -181464 |
| 3modern | 608 | Page, Benjamin (1555) | Lost 0-2 | -161448 |
| 4modern | 626 | Wolff, Nick (1446) | Won 2-1 | +181466 |
| 5modern | 543 | Paini, Brady (1463) | Lost 1-2 | -181448 |
| 6modern | 504 | Sackett, Tiffany (1423) | Won 2-1 | +181466 |
| 7modern | 390 | Kenealy, Deglin (1468) | Lost 0-2 | -181448 |
| 8modern | 350 | Rice, Newel (1448) | Lost 1-2 | -181430 |
| average opponent: 1476record: 2-6 | new rating: 1430 | |||