Poskin, John
Current rating: 1515
Record: 7-6
| Grand Prix Chicago 2014 (JOU standard) | starting rating: 1519 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 671 | Bridges, Alex (1468) | Won 2-0 | +171536 |
| 2standard | 579 | Barton, Tim (1446) | Won 2-1 | +161552 |
| 3standard | 543 | Johnson, Adam (1622) | Lost 1-2 | -171535 |
| 4standard | 735 | Zeug, Anthony (1452) | Won 2-0 | +171552 |
| 5standard | 585 | Kahn, Max (1519) | Lost 0-2 | -191533 |
| 6standard | 675 | Tignor, Jessica (1517) | Lost 1-2 | -181515 |
| average opponent: 1504record: 3-3 | new rating: 1515 | |||
| Grand Prix Indianapolis 2008 (SHM limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 322 | Ng, Sherwin (1500) | Won 2-0 | +181518 |
| 2sealed | 21 | Colliver, Benjamin (1518) | Lost 0-2 | -181500 |
| 3sealed | 224 | Ward, James (1500) | Won 2-0 | +181518 |
| 4sealed | 190 | Ma, Will (1483) | Lost 0-2 | -191499 |
| 5sealed | 250 | Pimm, Douglas (1562) | Won 2-0 | +201519 |
| 6sealed | 170 | Boeckmann, Trevor (1524) | Won 2-1 | +181537 |
| 7sealed | 171 | Pino, Greg (1537) | Lost 1-2 | -181519 |
| average opponent: 1518record: 4-3 | new rating: 1519 | |||