Preskitt, John
Current rating: 1511
| Grand Prix Orlando 2018 (M19 standard) | starting rating: 1487 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 176 | Orellana, Manuel (1770) | Lost 1-2 | -131474 |
| 4standard | 277 | Tietze, Maxwell (1792) | Lost 0-2 | -131461 |
| 5standard | 301 | Cox, Patrick (1667) | Won 2-1 | +221483 |
| 6standard | 169 | Crompton, Chase (1517) | Won 2-0 | +191502 |
| 7standard | 216 | Bolding, Jon (1729) | Won 2-1 | +221524 |
| 8standard | 78 | Kanner, Zack (1834) | Lost 0-2 | -131511 |
| top | average opponent: 1718record: 3-3 | new rating: 1511 | ||
| Grand Prix New Orleans 2003 (extended) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 101 | Bujnowski, Peter (1483) | Lost 1-2 | -181446 |
| 2extended | 97 | Shelli, Robert (1482) | Draw 1-1 | +11447 |
| 3extended | 129 | Helton, Jeremy (1482) | Lost 1-2 | -171430 |
| 4extended | 170 | Shores, Curt (1464) | Won 2-0 | +181448 |
| 5extended | 141 | Tatum, Matthew (1482) | Won 2-0 | +191467 |
| 6extended | 114 | Kinder, Jason (1483) | Lost 1-2 | -181449 |
| 7extended | 102 | Richardson, Logan (1481) | Won 2-0 | +191468 |
| 8extended | 79 | Chounard, Jesse (1519) | Won 1-0 | +191487 |
| top | average opponent: 1485record: 4-3-1 | new rating: 1487 | ||
| Grand Prix Washington DC 1999 (UDS limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 91 | Snead, Chris (1500) | Lost 0-0 | -181482 |
| 2sealed | 146 | Melton, Craig (1482) | Lost 0-0 | -181464 |
| 3sealed | 179 | Bigg, Michael (1463) | Won 0-0 | +181482 |
| 4sealed | 160 | Parkin, Lisa (1482) | Lost 0-0 | -181464 |
| top | average opponent: 1482record: 1-3 | new rating: 1464 | ||