Persoh, Derek
Current rating: 1501
Record: 2-2-1
| Grand Prix Vienna 1999 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 39 | Zwettler, Andreas (1500) | Lost 0-0 | -181482 |
| 2extended | 158 | Brglez, Andrej (1482) | Won 0-0 | +181500 |
| 3extended | 101 | Pernstich, Christian (1500) | Draw 0-0 | 01500 |
| 4extended | 108 | Nilsen, Thomas An (1500) | Won 0-0 | +181518 |
| 5extended | 72 | Ladra, Lukas (1551) | Lost 0-0 | -171501 |
| average opponent: 1507record: 2-2-1 | new rating: 1501 | |||