Duchock, Jonathan
Current rating: 1479
| Grand Prix New Jersey 2019 (RNA limited) | starting rating: 1518 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 294 | Meisner, David (1500) | Won 2-1 | +171535 |
| 2sealed | 311 | Kleinman, Neal (1548) | Lost 1-2 | -171518 |
| 3sealed | 543 | Thomas, Rob (1417) | Lost 1-2 | -201498 |
| 4sealed | 493 | Wheatley, Josiah (1439) | Lost 0-2 | -191479 |
| top | average opponent: 1476record: 1-3 | new rating: 1479 | ||
| Grand Prix New Jersey 2017 (lim) (XLN limited) | starting rating: 1498 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 15 | Bonuzzi, Matteo (1500) | Lost 0-2 | -181480 |
| 2sealed | 407 | Scheffler, Robert (1423) | Won 2-0 | +171497 |
| 3sealed | 370 | Chadda, Krishan (1508) | Won 2-0 | +191516 |
| 4sealed | 152 | Muniz, Jorge (1608) | Lost 1-2 | -171499 |
| 5sealed | 273 | Lee, Dustin (1444) | Won 2-0 | +171516 |
| 6sealed | 312 | McCullough, John (1536) | Won 2-0 | +191535 |
| 7sealed | 173 | Neal, Stephen (1783) | Won 2-1 | +221557 |
| 8sealed | 155 | Della Grotte, Kevin (1481) | Lost 0-2 | -191538 |
| 9sealed | 199 | Card, Garry (1432) | Lost 1-2 | -201518 |
| top | average opponent: 1524record: 5-4 | new rating: 1518 | ||
| Grand Prix Nashville 2010 (SOM limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 178 | Odom, Mitch (1464) | Lost 0-2 | -191481 |
| 2sealed | 267 | Smith III, Floyd (1447) | Won 2-1 | +181499 |
| 3sealed | 132 | Rivera, Ruthie (1504) | Won 2-1 | +181517 |
| 4sealed | 152 | Higgins, Brian J (1453) | Lost 1-2 | -191498 |
| 5sealed | 253 | Ori, Ryan (1469) | Lost 0-2 | -191479 |
| 6sealed | 215 | Legler, Tad (1550) | Draw 1-1 | +11480 |
| 7sealed | 169 | Barrett, Lance C (1482) | Won 2-0 | +181498 |
| top | average opponent: 1481record: 3-3-1 | new rating: 1498 | ||