Obregon Morales, Jose Donaldo
Current rating: 1414
Record: 1-6
| Grand Prix Mexico City 2018 (GRN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 27 | Diaz Torres, Saul (1500) | Lost 0-2 | -181482 |
| 2sealed | 110 | Castro Gonzalez, Alfonso (1483) | Won 2-0 | +181500 |
| 3sealed | 134 | Trevino Gonzalez, Daniel (1517) | Lost 0-2 | -181482 |
| 4sealed | 181 | Malquichagua, Manuel (1605) | Lost 0-2 | -151467 |
| 5sealed | 175 | Sanchez, Omar (1537) | Lost 0-2 | -171450 |
| 6sealed | 163 | Sanchez Gaos, Rodrigo (1449) | Lost 1-2 | -181432 |
| 7sealed | 146 | Castano Collazos, Eduardo (1452) | Lost 1-2 | -181414 |
| average opponent: 1506record: 1-6 | new rating: 1414 | |||