weidema, Duco
Current rating: 1484
Record: 4-5
| Grand Prix Rotterdam 2009 (CON limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 40 | Siirand, Ahti (1500) | Lost 1-2 | -181482 |
| 2sealed | 190 | Scherpenzeel, Dennis (1482) | Lost 0-2 | -181464 |
| 3sealed | 264 | Been, Iso (1463) | Won 2-0 | +181482 |
| 4sealed | 216 | Tates, Jorrin (1480) | Lost 0-2 | -181464 |
| 5sealed | 233 | Van Orle, Christiaan (1464) | Won 2-0 | +181482 |
| 6sealed | 174 | Wauters, Tom (1496) | Won 2-1 | +181500 |
| 7sealed | 130 | Sonnenschein, Benedikt (1601) | Lost 1-2 | -161484 |
| 8sealed | 115 | Almeras, Xavier (1466) | Lost 0-2 | -181466 |
| 9sealed | 98 | Vanderhaegen, Veerle (1467) | Won 2-1 | +181484 |
| average opponent: 1491record: 4-5 | new rating: 1484 | |||