Costa, Joao Miguel
Current rating: 1507
Record: 15-17
| Grand Prix Lisbon 2012 (RTR limited) | starting rating: 1422 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 60 | Giner, Pablo (1647) | Won 2-0 | +221444 |
| 2sealed | 22 | Pina, Nilton (1440) | Lost 1-2 | -181426 |
| 3sealed | 190 | Magnell, Stian Marcuss (1547) | Lost 1-2 | -161410 |
| 4sealed | 246 | Batista, Marco (1483) | Won 2-0 | +201430 |
| 5sealed | 191 | Da Silva, Ruben (1530) | Won 2-0 | +191449 |
| 6sealed | 126 | Espenes, Vidar (1574) | Won 2-0 | +211470 |
| 7sealed | 144 | Pestov, Evgeny (1483) | Won 2-1 | +181488 |
| 8sealed | 59 | Rega, Guido (1538) | Won 2-1 | +191507 |
| 9sealed | 38 | Araujo, Miguel (1612) | Won 2-0 | +201527 |
| 10draft | 39 | Koornneef, Kenny (1678) | Lost 1-2 | -151512 |
| 11draft | 9 | Le Bot, Philippe (1705) | Won 2-1 | +211533 |
| 12draft | 68 | Moreira, Maximo (1743) | Lost 1-2 | -141519 |
| 13draft | 71 | Lucena, Daniel (1651) | Lost 1-2 | -161503 |
| 14draft | 41 | Saval Marhuenda, Alberto (1557) | Won 2-1 | +191522 |
| 15draft | 74 | Bertoni, Nicolas (1663) | Lost 1-2 | -151507 |
| top | average opponent: 1590record: 9-6 | new rating: 1507 | ||
| Grand Prix Madrid 2012 (DKA limited) | starting rating: 1430 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 671 | Diez Morales, Daniel (1431) | Lost 1-2 | -181412 |
| 2sealed | 792 | Novoa, Jesus (1449) | Lost 0-2 | -171395 |
| 3sealed | 857 | Santos, Luis 2530 (1463) | Won 2-1 | +191414 |
| 4sealed | 885 | Ortiz de Zarate, Javier (1581) | Won 2-1 | +211435 |
| 5sealed | 820 | Bouchery, Aymeric (1464) | Lost 0-2 | -181417 |
| 6sealed | 827 | Polenne, Vincent (1443) | Lost 1-2 | -171400 |
| 7sealed | 825 | Gozzo, Alessandro (1538) | Lost 0-2 | -161384 |
| 8sealed | 797 | Leon Espinosa, Daniel (1443) | Won 2-1 | +191403 |
| 9sealed | 760 | Frutos, Ocana (1445) | Won 2-0 | +191422 |
| top | average opponent: 1473record: 4-5 | new rating: 1422 | ||
| Grand Prix Madrid 2008 (EVE limited) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 102 | Munoz, Omar (1464) | Won 2-0 | +181481 |
| 2sealed | 55 | Auvray, Johann (1497) | Lost 0-2 | -171464 |
| 3sealed | 236 | Miguel, Andres (1548) | Lost 0-2 | -171447 |
| 4sealed | 274 | Pitt, Edmund (1483) | Lost 1-2 | -171430 |
| top | average opponent: 1498record: 1-3 | new rating: 1430 | ||
| Grand Prix Lisbon 2005 (BOK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 75 | Hernandez, Ruben [ESP] (1479) | Won 2-1 | +181518 |
| 2sealed | 131 | Pina, Bonifacio Olimpio (1503) | Lost 0-2 | -191499 |
| 3sealed | 172 | Serra, Sergio (1500) | Lost 1-2 | -181481 |
| 4sealed | 216 | Pinto, Miguel (1482) | Lost 0-2 | -181463 |
| top | average opponent: 1491record: 1-3 | new rating: 1463 | ||