Kamstra, Yorben
Current rating: 1448
Record: 4-7-1
| Grand Prix Amsterdam 2011 (legacy) | starting rating: 1480 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 96 | Van Aarst, Patrick (1500) | Won 2-0 | +181498 |
| 2legacy | 96 | Speckmann, Marcel (1568) | Lost 0-2 | -171481 |
| 3legacy | 96 | Dziegel, Bruno (1522) | Won 2-1 | +191500 |
| 4legacy | 96 | Doucet, Niels (1565) | Lost 1-2 | -171483 |
| 5legacy | 96 | Becker, Mattias (1520) | Lost 0-2 | -171466 |
| 6legacy | 96 | Slikker, Joey (1482) | Lost 1-2 | -181448 |
| average opponent: 1526record: 2-4 | new rating: 1448 | |||
| Grand Prix Brussels 2010 (WWK standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 633 | Stolte, Jakob (1373) | Won 2-1 | +161516 |
| 2standard | 744 | Lange, Robert (1524) | Lost 0-2 | -181498 |
| 3standard | 744 | Baldus, Michael (1522) | Lost 1-2 | -181480 |
| 4standard | 744 | Illan Franco, Sebastian (1481) | Draw 1-1 | 01480 |
| 5standard | 744 | Kunz, Markus (1405) | Lost 1-2 | -191461 |
| 6standard | 744 | Rac, Robert (1501) | Won 2-1 | +191480 |
| average opponent: 1468record: 2-3-1 | new rating: 1480 | |||