Joao Marcos Aquino,
Current rating: 1504
Record: 3-3
| Grand Prix Sao Paulo 2009 (ARB standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 74 | Oliveira Vieira Basili, Samuel (1536) | Won 2-0 | +191519 |
| 4standard | 32 | Waiss Pulvirenti, Eduardo (1553) | Lost 0-2 | -181501 |
| 5standard | 56 | Rocha, Christian J (1522) | Won 2-0 | +191520 |
| 6standard | 58 | Monsalve, Andres (1539) | Lost 0-0 | -181502 |
| 7standard | 134 | Betschart, Mauro (1513) | Won 2-1 | +181520 |
| 8standard | 88 | Fonseca, Guilherme (1602) | Lost 0-2 | -161504 |
| average opponent: 1544record: 3-3 | new rating: 1504 | |||