Marquez, Guillermo
Current rating: 1379
Record: 4-11
| Grand Prix Lisbon 2005 (BOK limited) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 197 | Moreira, Miguel (1462) | Won 2-0 | +181482 |
| 2sealed | 26 | Henriques, Bruno (1535) | Lost 0-2 | -171465 |
| 3sealed | 189 | Vicente Ferrer, Ricardo (1582) | Lost 1-2 | -161449 |
| 4sealed | 201 | Pinheiro, Nelson (1482) | Lost 0-2 | -171432 |
| 5sealed | 216 | Silva, Ivo (1461) | Lost 1-2 | -181414 |
| 6sealed | 202 | Martins, Goncalo (1445) | Lost 1-2 | -171397 |
| 7sealed | 173 | Silva, Diogo 2482 (1427) | Lost 0-2 | -181379 |
| average opponent: 1485record: 1-6 | new rating: 1379 | |||
| Grand Prix Seville 2003 (LGN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 322 | Nogueira, Pedro (1500) | Won 2-0 | +181518 |
| 2sealed | 121 | Vidal, Juan (1563) | Lost 0-2 | -171501 |
| 3sealed | 173 | Ventura, Carlos (1501) | Won 2-0 | +181519 |
| 4sealed | 173 | Fernandez Bonilla, Luis (1518) | Won 2-1 | +181537 |
| 5sealed | 77 | Galbany, Jordi (1520) | Lost 1-2 | -181519 |
| 6sealed | 154 | Company Bernal, Miquel (1488) | Lost 1-2 | -191500 |
| 7sealed | 149 | Vazquez, Francisco Javier (1501) | Lost 1-2 | -181482 |
| 8sealed | 158 | Moreno, David (1482) | Lost 0-2 | -181464 |
| average opponent: 1509record: 3-5 | new rating: 1464 | |||