Guillaume, Cornelis
Current rating: 1444
Record: 1-4-2
| Grand Prix Rotterdam 2009 (CON limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 433 | Vicaire, Sebastien (1500) | Draw 1-1 | 01500 |
| 2sealed | 571 | Zehm, Wolfgang (1481) | Won 2-1 | +181518 |
| 3sealed | 505 | Vogin, David (1542) | Lost 0-2 | -181500 |
| 4sealed | 591 | Houssaini, Sammy (1548) | Draw 1-1 | +11501 |
| 5sealed | 618 | Ren, Xi (1498) | Lost 1-2 | -181483 |
| 6sealed | 598 | Brinks, Eric (1322) | Lost 1-2 | -211462 |
| 7sealed | 567 | Dorliat, Max (1461) | Lost 0-2 | -181444 |
| average opponent: 1479record: 1-4-2 | new rating: 1444 | |||