Ferreira, Guilherme
Current rating: 1618
| Grand Prix Madrid 2004 (DST limited) | starting rating: 1595 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 502 | Cardoso, Pedro (1549) | Won 2-0 | +171612 |
| 2sealed | 132 | Moreno, Guido (1518) | Lost 1-2 | -201592 |
| 3sealed | 388 | Atoch, Arnaud (1500) | Won 2-0 | +171609 |
| 4sealed | 167 | Maestro, Valentin (1518) | Lost 1-2 | -201589 |
| 5sealed | 406 | Mondejar Bernal, Jose (1466) | Won 2-0 | +161605 |
| 6sealed | 174 | Martins, Rui 5639 (1520) | Won 2-0 | +161621 |
| 7sealed | 107 | Feijoo, Angel (1535) | Won 2-0 | +171638 |
| 8sealed | 137 | Parra, Sergio (1550) | Lost 0-2 | -201618 |
| top | average opponent: 1520record: 5-3 | new rating: 1618 | ||
| Grand Prix Lisbon 2002 (extended) | starting rating: 1517 | |||
| round | table | opponent (rating) | result | Δrating |
| 2extended | 46 | Carvalho, Ruben (1518) | Won 2-0 | +181535 |
| 3extended | 24 | Sousa, Tiago (1536) | Won 2-1 | +181553 |
| 4extended | 8 | Catarino, Andre (1553) | Won 2-1 | +181571 |
| 5extended | 24 | Bernabeu-Edo, Jesus (1561) | Lost 0-2 | -181553 |
| 6extended | 49 | venancio, filipe (1555) | Won 2-1 | +181571 |
| 7extended | 29 | Lantto, Magnus (1604) | Won 2-0 | +191590 |
| 8extended | 12 | Costa, Frederico (1505) | ID | 01590 |
| 9extended | 9 | Osorio, Joao (1656) | Won 2-1 | +191609 |
| 10extended | 6 | Summersberger, Helmut (1831) | Lost 1-2 | -141595 |
| 11extended | 14 | Felix, Helio (1690) | Won 2-0 | +201615 |
| 12extended | 14 | Giusti, Norberto (1583) | Won 2-1 | +171632 |
| 13extended | 6 | Canavesi, Daniele (1561) | Lost 1-2 | -191613 |
| 14extended | 13 | Cabrera Martinez, Victor (1619) | Lost 1-2 | -181595 |
| top | average opponent: 1598record: 8-4-1 | new rating: 1595 | ||
| Grand Prix Porto 2000 (PCY limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 153 | Aurelio, Sergio (1500) | Won 2-0 | +181518 |
| 2sealed | 123 | Gomes, Julio (1518) | Won 2-0 | +181536 |
| 3sealed | 62 | Castro, Simao (1536) | Lost 0-2 | -181518 |
| 4sealed | 94 | Malveiro, Joao (1531) | Lost 0-0 | -181500 |
| 5sealed | 149 | Rocha, Nelson (1499) | Won 2-0 | +181518 |
| 6sealed | 127 | Silva, Victor (1519) | Won 2-0 | +181536 |
| 7sealed | 79 | Norris, Pete (1494) | Lost 1-2 | -191517 |
| top | average opponent: 1514record: 4-3 | new rating: 1517 | ||