Guilherme Augusto Borg,
Current rating: 1481
Record: 4-5
| Grand Prix Sao Paulo 2009 (ARB standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 164 | Rodrigo M dos Santos, (1500) | Lost 1-2 | -181482 |
| 2standard | 202 | Rodrigues Puerta, Andrews (1482) | Won 2-1 | +181500 |
| 3standard | 178 | Pedro Paulo Brockveld, (1500) | Won 2-0 | +181518 |
| 4standard | 134 | Francisco Divita, (1516) | Lost 0-2 | -181500 |
| 5standard | 180 | Lopes, Luiz A (1482) | Won 2-0 | +181518 |
| 6standard | 150 | Fernandes Ferraz, Diego (1503) | Lost 0-0 | -191499 |
| 7standard | 163 | Vinicius Santos Rodrig, (1501) | Lost 0-2 | -181481 |
| 8standard | 146 | Diego K Vieira, (1483) | Won 2-0 | +181499 |
| 9standard | 103 | Abeche, Jean Paul (1454) | Lost 0-2 | -181481 |
| average opponent: 1491record: 4-5 | new rating: 1481 | |||