Castro, Mario
Current rating: 1483
Record: 3-4
| Grand Prix Costa Rica 2012 (M13 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 2 | Calvo, Javier (1500) | Won 2-1 | +181518 |
| 3sealed | 6 | Esquivel Nunez, Luis (1518) | Lost 0-2 | -181500 |
| 4sealed | 75 | Mendez, Esteban (1501) | Won 2-1 | +181518 |
| 5sealed | 36 | Garita, Pablo (1519) | Lost 0-2 | -181500 |
| 6sealed | 61 | Cowan, John William (1568) | Lost 0-2 | -171483 |
| 7sealed | 102 | Cordon, Diego (1483) | Lost 0-2 | -181465 |
| 8sealed | 98 | De Arco, Carlos (1467) | Won 2-1 | +181483 |
| average opponent: 1508record: 3-4 | new rating: 1483 | |||