Marin, Guilherme
Current rating: 1450
Record: 3-6
| Grand Prix Porto Alegre 2004 (COK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 105 | Campana, Rubens (1554) | Won 2-1 | +191519 |
| 5sealed | 8 | Coqueiro, Rafael S (1433) | Lost 0-2 | -201499 |
| 6sealed | 39 | Gouvea de Oliveira, Adilson (1542) | Lost 0-2 | -171482 |
| 7sealed | 47 | Santos, Renato (1504) | Won 2-0 | +191501 |
| 8rochester | 15 | Sampaio, Cassiano (1537) | Lost 1-2 | -181483 |
| 9rochester | 2 | Sakugawa Tobaru, Marco (1523) | Won 2-0 | +191502 |
| 10rochester | 26 | Vianna, Bruno (1527) | Lost 0-2 | -181484 |
| 11rochester | 13 | Silveira, Robson (1504) | Lost 1-2 | -171467 |
| 13rochester | 27 | Dominguez, Alejandro (1558) | Lost 0-2 | -171450 |
| average opponent: 1520record: 3-6 | new rating: 1450 | |||