Costa, Joao
Current rating: 1514
Record: 24-27-3
| Grand Prix Brussels 2020 (pioneer) | starting rating: 1476 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 309 | Meurisse, Julien (1518) | Lost 0-2 | -171459 |
| 2pioneer | 515 | Chaine, Arthur (1469) | Lost 0-2 | -181441 |
| 3pioneer | 773 | Manhaval, Baptiste (1534) | Lost 1-2 | -161425 |
| 4pioneer | 795 | Kaurin, Magne Kristian (1466) | Won 2-0 | +191444 |
| 5pioneer | 713 | Perpete, Fabrice (1486) | Won 2-1 | +181462 |
| 6pioneer | 564 | Hungenberg, Timo (1515) | Won 2-0 | +191481 |
| 7pioneer | 471 | Muller, Moritz (1326) | Won 2-1 | +161497 |
| 8pioneer | 342 | Taylor, Ceri (1478) | Won 2-0 | +171514 |
| top | average opponent: 1474record: 5-3 | new rating: 1514 | ||
| Grand Prix London 2016 (KLD limited) | starting rating: 1445 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 256 | Mizerak, Peter (1575) | Lost 1-2 | -151430 |
| 2sealed | 907 | Ireland, Peter (1464) | Won 2-0 | +181448 |
| 3sealed | 723 | Tosi, Roberto (1456) | Won 2-0 | +181466 |
| 4sealed | 484 | Brett, Philip (1463) | Won 2-0 | +181484 |
| 5sealed | 240 | de Graaff, Claes (1671) | Lost 0-2 | -141470 |
| 6sealed | 682 | Saiyasely, Liking (1686) | Lost 0-2 | -141456 |
| 7sealed | 590 | Au, Nathan Xun-Ling (1517) | Won 2-0 | +191475 |
| 8sealed | 550 | Rowan, Ellis (1521) | Lost 0-2 | -171458 |
| 9sealed | 594 | Perl, Jakob (1496) | Won 2-0 | +181476 |
| top | average opponent: 1539record: 5-4 | new rating: 1476 | ||
| Grand Prix Milan 2014 (JOU limited) | starting rating: 1412 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 47 | Favier, Laurent (1466) | Lost 0-2 | -171395 |
| 2sealed | 430 | Rohm, Markus (1454) | Won 1-0 | +191414 |
| 3sealed | 450 | Fichera, Giovanni (1477) | Won 2-0 | +191433 |
| 4sealed | 335 | Campos, Paulo (1661) | Won 2-0 | +221455 |
| 5sealed | 101 | Tobiasch, Marc (1669) | Won 2-0 | +221477 |
| 6sealed | 83 | Grieco, Piermatteo (1521) | Lost 0-2 | -171460 |
| 7sealed | 138 | Barry, Olivier (1688) | Lost 1-2 | -141446 |
| 8sealed | 179 | Moeken, Ed (1291) | Lost 1-2 | -211425 |
| 9sealed | 128 | Valverde Calero, Fernando (1547) | Won 2-1 | +201445 |
| top | average opponent: 1530record: 5-4 | new rating: 1445 | ||
| Grand Prix Paris 2014 (legacy) | starting rating: 1379 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 109 | Van Heel, Jeroen (1534) | Draw 1-1 | +31382 |
| 4legacy | 306 | De Sando, Tomasso (1532) | Won 2-0 | +211403 |
| 5legacy | 102 | Debureau, Theauld (1404) | Lost 0-2 | -181385 |
| 6legacy | 221 | Campanario, Israel (1465) | Lost 0-2 | -171368 |
| 7legacy | 349 | Puissant, Benjamin (1568) | Won 2-1 | +221390 |
| 8legacy | 234 | Matkoski, Mikko (1538) | Won 2-1 | +201410 |
| 9legacy | 110 | Pape, Frederik (1492) | Draw 1-1 | +21412 |
| top | average opponent: 1505record: 3-2-2 | new rating: 1412 | ||
| Grand Prix Valencia 2013 (THS limited) | starting rating: 1383 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 221 | Alcantara, Adrian (1668) | Lost 0-2 | -131370 |
| 4sealed | 221 | Portillo, Ivan (1509) | Lost 0-2 | -151355 |
| 5sealed | 221 | Rubi, Oscar (1454) | Won 2-1 | +201375 |
| 6sealed | 93 | Paricio Perez, Adria (1485) | Won 2-1 | +201395 |
| 7sealed | 221 | Brito, Jorge (1539) | Lost 0-2 | -161379 |
| top | average opponent: 1531record: 2-3 | new rating: 1379 | ||
| Grand Prix Lisbon 2012 (RTR limited) | starting rating: 1435 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 61 | Laclaverie, Laurent (1433) | Lost 0-2 | -181417 |
| 2sealed | 237 | Merlo, Gianluca (1468) | Lost 0-2 | -171400 |
| 3sealed | 274 | Oliveira, Afonso (1467) | Lost 0-2 | -171383 |
| top | average opponent: 1456record: 0-3 | new rating: 1383 | ||
| Grand Prix Barcelona 2006 (GPT limited) | starting rating: 1450 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 93 | Dorle, Anthony (1466) | Lost 0-0 | -171433 |
| 2sealed | 257 | Martin, Oscar (1482) | Won 2-1 | +191452 |
| 3sealed | 183 | Vallejo Pascual, Inigo (1485) | Draw 1-1 | 01452 |
| 4sealed | 169 | Samblas, Carlos (1501) | Lost 0-2 | -171435 |
| top | average opponent: 1483record: 1-2-1 | new rating: 1435 | ||
| Grand Prix Lisbon 2005 (BOK limited) | starting rating: 1466 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 154 | Nunn, Richard (1448) | Lost 0-2 | -181448 |
| 2sealed | 217 | Santos, Antonio (1482) | Won 2-0 | +191467 |
| 3sealed | 188 | Cavaleiro, Pedro (1499) | Lost 0-2 | -181449 |
| 4sealed | 220 | Santos, Claudio 810 (1482) | Won 2-1 | +191468 |
| 5sealed | 119 | Fernandes, Marco (1502) | Lost 0-2 | -181450 |
| top | average opponent: 1483record: 2-3 | new rating: 1450 | ||
| Grand Prix Madrid 2004 (DST limited) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 371 | Martin Bernardi, Pablo (1554) | Won 2-1 | +201484 |
| 2sealed | 115 | Martins, Antonio (1518) | Lost 0-2 | -181466 |
| top | average opponent: 1536record: 1-1 | new rating: 1466 | ||
| Grand Prix Porto 2000 (PCY limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 143 | Liste, Jesus (1500) | Lost 1-2 | -181482 |
| 2sealed | 182 | Pontes, ??? (1482) | Lost 0-2 | -181464 |
| top | average opponent: 1491record: 0-2 | new rating: 1464 | ||