Dekker, Marc
Current rating: 1452
| Grand Prix Rotterdam 2009 (CON limited) | starting rating: 1469 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 58 | Krabbenbos, Esther (1446) | Won 2-0 | +181487 |
| 2sealed | 17 | Saveau, Thomas (1493) | Lost 0-2 | -181469 |
| 3sealed | 194 | de Haan, Floris 0247 (1500) | Lost 0-2 | -171452 |
| top | average opponent: 1480record: 1-2 | new rating: 1452 | ||
| Grand Prix Eindhoven 2005 (extended) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 87 | Rotstejn, Thimon (1500) | Won 2-1 | +191500 |
| 2extended | 132 | Jurk, Rainer (1518) | Lost 1-2 | -181482 |
| 3extended | 212 | Bruno, Luca (1464) | Lost 0-2 | -181464 |
| 4extended | 363 | Schoonderwoerd, Robin (1483) | Won 2-1 | +181482 |
| 5extended | 305 | Unfried, Jorg (1787) | Lost 0-2 | -131469 |
| top | average opponent: 1550record: 2-3 | new rating: 1469 | ||
| Grand Prix Vienna 2004 (COK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 227 | Surynek, Tomas T (1500) | Won 2-0 | +181518 |
| 2sealed | 2 | Mazzurco, Carlo (1523) | Won 2-0 | +181536 |
| 3sealed | 124 | Delvaux, Charles (1821) | Lost 0-2 | -131523 |
| 4sealed | 285 | Weber, Thomas (1319) | Won 2-1 | +141537 |
| 5sealed | 138 | Dvoracek, Dominik (1446) | Lost 0-2 | -191518 |
| 6sealed | 257 | Rogowska Borys, Dorota (1491) | Lost 0-2 | -191499 |
| 7sealed | 250 | Fajmon, Milan (1496) | Lost 0-2 | -181481 |
| top | average opponent: 1514record: 3-4 | new rating: 1481 | ||