Keijzer, Duncan
Current rating: 1473
| Grand Prix Amsterdam 2011 (legacy) | starting rating: 1511 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 865 | Berdou, Dennis (1487) | Lost 0-2 | -191492 |
| 2legacy | 922 | Repeto Loaiza, Pedro Jose (1446) | Lost 1-2 | -181474 |
| 3legacy | 954 | Cuvelier, Jeroen (1454) | Won 2-1 | +171491 |
| 4legacy | 924 | Elon, Raviv (1485) | Won 2-0 | +181509 |
| 5legacy | 916 | Pfitzner, Lutz (1495) | Lost 0-2 | -181491 |
| 6legacy | 894 | David, Vincent (1482) | Lost 0-2 | -181473 |
| 7legacy | 905 | Moes, Bastiaan (1464) | Won 2-0 | +181491 |
| 8legacy | 829 | Koch, Andreas (1500) | Lost 1-2 | -181473 |
| top | average opponent: 1476record: 3-5 | new rating: 1473 | ||
| Grand Prix Chicago 2009 (legacy) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 4legacy | 68 | Tabler, Michael (1500) | Won 2-0 | +181499 |
| 5legacy | 37 | Collora, Anthony P (1571) | Won 2-0 | +191518 |
| 6legacy | 12 | Khanin, Alex (1588) | Won 2-0 | +201538 |
| 7legacy | 9 | Vidugiris, Gaudenis (1706) | Lost 0-2 | -151523 |
| 8legacy | 34 | Gacioch, Daniel (1561) | Won 2-1 | +181541 |
| 9legacy | 10 | Temple, George (1554) | Draw 1-1 | +11542 |
| 10legacy | 16 | Andersen, Christoffer (1630) | Won 2-0 | +191561 |
| 11legacy | 10 | Carpenter, Brad (1596) | Lost 0-2 | -171544 |
| 12legacy | 25 | Diaz Diaz, Pablo David (1617) | Lost 1-2 | -171527 |
| 13legacy | 40 | Barbeau, Jeremy (1619) | Lost 0-2 | -161511 |
| top | average opponent: 1594record: 5-4-1 | new rating: 1511 | ||
| Grand Prix Rotterdam 2009 (CON limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 21 | Emmanuel, Delaunoy (1479) | Lost 0-2 | -181482 |
| 2sealed | 233 | Kleingeld, Hajo (1482) | Won 2-1 | +181500 |
| 3sealed | 216 | Hild, Greg (1504) | Won 2-1 | +181518 |
| 4sealed | 151 | Lamberto, Damien (1464) | Lost 1-2 | -191499 |
| 5sealed | 171 | Siirand, Ahti (1500) | Lost 1-2 | -181481 |
| top | average opponent: 1486record: 2-3 | new rating: 1481 | ||