Zwart, Jan Willem
Current rating: 1506
Record: 11-11
| Grand Prix Rotterdam 2009 (CON limited) | starting rating: 1507 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 161 | Orluff, Casper (1500) | Won 2-0 | +181525 |
| 2sealed | 150 | Spacek, Pavel (1642) | Lost 0-2 | -161509 |
| 3sealed | 164 | Faber, Enne (1440) | Lost 1-2 | -191490 |
| 4sealed | 208 | Limneos, Marc (1429) | Won 2-0 | +171507 |
| 5sealed | 141 | Martire, Roque (1499) | Won 2-1 | +181525 |
| 6sealed | 106 | Illig, Jerome (1495) | Lost 0-2 | -191506 |
| top | average opponent: 1501record: 3-3 | new rating: 1506 | ||
| Grand Prix Brussels 2008 (SHM limited) | starting rating: 1524 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 45 | D'Hooge, Rob (1483) | Won 2-0 | +181542 |
| 3sealed | 20 | Scheinin, Martin (1744) | Lost 1-2 | -151527 |
| 4sealed | 217 | Bouwen, Jef (1476) | Lost 0-2 | -191508 |
| 5sealed | 224 | De Waegeneer, Joran (1455) | Won 2-0 | +171525 |
| 6sealed | 185 | Thirapathi, Yohann (1504) | Lost 1-2 | -181507 |
| top | average opponent: 1532record: 2-3 | new rating: 1507 | ||
| Grand Prix Dortmund 2006 (GPT limited) | starting rating: 1505 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 101 | Zaadstra, David (1500) | Lost 1-2 | -181487 |
| 2sealed | 155 | Enevoldsen, Thomas (1542) | Won 2-1 | +191506 |
| 3sealed | 116 | Raker, Sascha (1608) | Won 2-1 | +201526 |
| 4sealed | 108 | Adams, George (1507) | Won 2-0 | +181544 |
| 5sealed | 90 | Fanghaenel, Alex (1475) | Lost 1-2 | -201524 |
| top | average opponent: 1526record: 3-2 | new rating: 1524 | ||
| Grand Prix Eindhoven 2005 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 4extended | 72 | Dannowski, Carsten (1500) | Won 2-0 | +181518 |
| 5extended | 44 | Hayek, Mikulas (1518) | Won 2-0 | +181536 |
| 6extended | 24 | Massat, Nicolas (1660) | Lost 0-2 | -161520 |
| 7extended | 49 | Wiedenbein, Holger (1626) | Won 2-1 | +201540 |
| 8extended | 18 | Nahodil, Petr (1636) | Lost 0-2 | -161524 |
| 9extended | 59 | Milio, Emanuele (1490) | Lost 1-2 | -191505 |
| top | average opponent: 1572record: 3-3 | new rating: 1505 | ||