Dekoster, Yoann
Current rating: 1524
Record: 6-5
| Grand Prix Paris 2004 (COK limited) | starting rating: 1501 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 66 | Cuneo, Vincent (1633) | Won 2-1 | +201521 |
| 2sealed | 143 | Ossapofsky, Reinhold (1517) | Lost 1-2 | -181503 |
| 3sealed | 138 | Preuss, Karl-Heinz (1485) | Won 2-0 | +181521 |
| 4sealed | 98 | Lemey, Maarten (1517) | Won 2-0 | +181539 |
| 5sealed | 90 | Delattre, Olivier (1536) | Won 2-0 | +181557 |
| 6sealed | 82 | Yvon, Guillaume (1548) | Lost 1-2 | -181539 |
| 7sealed | 110 | Caumes, Benjamin (1720) | Lost 0-2 | -151524 |
| average opponent: 1565record: 4-3 | new rating: 1524 | |||
| Grand Prix Lyon 2003 (MRD limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 163 | Libralesso, Pierrick (1500) | Won 2-1 | +181518 |
| 2sealed | 150 | Masson, Mathieu (1574) | Won 2-1 | +191537 |
| 3sealed | 93 | Cazenave, Julien (1537) | Lost 1-2 | -181519 |
| 4sealed | 182 | Galimov, Oleg (1518) | Lost 1-2 | -181501 |
| average opponent: 1532record: 2-2 | new rating: 1501 | |||