Del Rosario, Derek
Current rating: 1529
Record: 0-0 (GP) / 4-3 (professional)
| Pro Tour Chicago 1999 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 115 | Schneiders, Felix (1486) | Lost 0-2 | -181482 |
| 2extended | 149 | Connolly, Joe (1482) | Won 2-0 | +181500 |
| 3extended | 125 | Clegg, Daniel (1677) | Won 2-0 | +211521 |
| 4extended | 33 | Nishiwaki, Masahiro (1489) | Lost 0-2 | -191502 |
| 5extended | 108 | Nduati, Michael (1490) | Won 2-0 | +181520 |
| 6extended | 76 | Labarre, Nicolas (1773) | Won 2-0 | +231543 |
| 7extended | 46 | Krakower, Gary (1775) | Lost 0-2 | -141529 |
| average opponent: 1596record: 4-3 | new rating: 1529 | |||