Berkenfield, Jonathan
Current rating: 1465
Record: 4-6
| Grand Prix Miami 2015 (FRF standard) | starting rating: 1503 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 122 | Zajas, Mitchell (1500) | Lost 1-2 | -181485 |
| 2standard | 429 | Smith, Scott D (1482) | Won 2-0 | +181503 |
| 3standard | 475 | Amburgey, Brad (1475) | Lost 0-2 | -181485 |
| 4standard | 595 | Lugo, Luis (1397) | Lost 1-2 | -201465 |
| average opponent: 1464record: 1-3 | new rating: 1465 | |||
| Grand Prix Orlando 2014 (KTK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 338 | Quigley, Sean (1647) | Won 2-0 | +211521 |
| 2sealed | 138 | Williams, Sam (1621) | Lost 0-2 | -171504 |
| 3sealed | 252 | Greene, Phillip (1494) | Won 2-1 | +181522 |
| 4sealed | 313 | King, Brogan (1497) | Won 2-0 | +181540 |
| 5sealed | 185 | Hudgens, Justin (1536) | Lost 1-2 | -181522 |
| 6sealed | 175 | Chieng, Lawrence (1487) | Lost 0-2 | -191503 |
| average opponent: 1547record: 3-3 | new rating: 1503 | |||