Guevara, Omar
Current rating: 1463
Record: 2-4
| Grand Prix Porto Alegre 2004 (COK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 4 | Gonzalez, Leandro (1500) | Lost 0-2 | -181482 |
| 2sealed | 137 | Lafuente, Diego (1424) | Lost 0-2 | -191463 |
| 3sealed | 145 | Eduardo M. Alves Santos, Jor (1464) | Won 2-0 | +181481 |
| 4sealed | 136 | Soares, Ubiratan Francamar (1480) | Lost 0-2 | -181463 |
| 5sealed | 147 | Bender, Eduardo (1464) | Won 2-0 | +181481 |
| 6sealed | 118 | Cavalheiro, Mauro Rocha (1482) | Lost 1-2 | -181463 |
| average opponent: 1469record: 2-4 | new rating: 1463 | |||