Zijlstra, Erwin
Current rating: 1494
Record: 6-6-1
| Grand Prix Amsterdam 2011 (legacy) | starting rating: 1534 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 703 | Kuiper, Steven (1500) | Lost 1-2 | -191515 |
| 2legacy | 935 | Teubner, Christoph D (1482) | Draw 1-1 | -11514 |
| 3legacy | 934 | Piipponen, Marko (1483) | Lost 1-2 | -181496 |
| 4legacy | 1025 | Nicolayev, Roman A (1463) | Won 2-0 | +171513 |
| 5legacy | 956 | Vey, Alexander (1449) | Lost 0-2 | -191494 |
| average opponent: 1475record: 1-3-1 | new rating: 1494 | |||
| Grand Prix Eindhoven 2005 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 199 | D'Hooge, Rob (1482) | Won 2-0 | +181518 |
| 2extended | 7 | Walther, Nico (1518) | Won 2-1 | +181536 |
| 3extended | 143 | Daems, Oliver (1560) | Won 2-1 | +181554 |
| 4extended | 104 | Lhomme, Steeve (1539) | Won 2-1 | +181572 |
| 5extended | 13 | Pollack, Frank (1480) | Won 2-0 | +161588 |
| 6extended | 4 | Snijdewind, Ruben (1545) | Lost 0-2 | -191569 |
| 7extended | 31 | Pesie, Pieter (1529) | Lost 1-2 | -181551 |
| 8extended | 59 | Roelofs, Frank (1602) | Lost 1-2 | -171534 |
| average opponent: 1532record: 5-3 | new rating: 1534 | |||