guilherme v cohen,
Current rating: 1485
Record: 1-2-1
| Grand Prix Sao Paulo 2009 (ARB standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 13 | Koga, Bruno (1536) | Draw 1-1 | +11501 |
| 4standard | 90 | Guilherme Freitas, (1536) | Won 2-1 | +181519 |
| 5standard | 43 | Gennari Souza, Juliano (1580) | Lost 1-2 | -171502 |
| 6standard | 98 | Bassetti, Carlos (1552) | Lost 0-0 | -171485 |
| average opponent: 1551record: 1-2-1 | new rating: 1485 | |||