de Guzman, Mark Percival O
Current rating: 1472
Record: 2-4
| Grand Prix Melbourne 2012 (DKA limited) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 39 | Stribbles, Glen (1500) | Won 2-0 | +181500 |
| 2sealed | 27 | Grain, Andrew (1748) | Won 2-0 | +231523 |
| 3sealed | 71 | Nicoll, Aaron (1592) | Lost 0-2 | -171506 |
| 4sealed | 156 | Wai, Haw Chuan (1620) | Lost 0-2 | -161490 |
| 5sealed | 152 | Richards, Darian (1485) | Lost 0-2 | -181472 |
| average opponent: 1589record: 2-3 | new rating: 1472 | |||
| Grand Prix Manila 2010 (ROE standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 403 | Matute, Edser (1500) | Lost 0-2 | -181482 |
| record: 0-1 | new rating: 1482 | |||