Koarata Da Costa, Willian Rafael
Current rating: 1576
Record: 20-17-2
| Grand Prix Houston 2016 (OGW standard) | starting rating: 1571 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 377 | Neighbors, Sebastian (1485) | Won 2-0 | +161587 |
| 3standard | 321 | Cheng, Patrick (1536) | Lost 1-2 | -191568 |
| 4standard | 483 | Ramos, Julian (1459) | Won 2-1 | +161584 |
| 5standard | 207 | Steuer, Nathan (1704) | Won 2-0 | +201604 |
| 6standard | 109 | Gottstein, Jeff (1622) | Lost 1-2 | -171587 |
| 7standard | 208 | McIntosh, John (1683) | Won 2-1 | +201607 |
| 8standard | 103 | Glenn, Andrew (1580) | Lost 0-2 | -191588 |
| 9standard | 197 | Griffith, Ethan (1544) | Won 2-1 | +171605 |
| 10standard | 171 | Winters, Troi (1510) | Won 2-1 | +161621 |
| 11standard | 167 | Hollman, Peter (1514) | Lost 1-2 | -191602 |
| 12standard | 158 | Solis, Juan (1590) | Lost 0-2 | -191583 |
| 13standard | 172 | Neal, Stephen (1839) | Won 2-1 | +231606 |
| 14standard | 146 | Casatti, Vagner William (2008) | Lost 1-2 | -111595 |
| 15standard | 157 | Polanco, Jorge (1554) | Lost 0-2 | -191576 |
| top | average opponent: 1616record: 7-7 | new rating: 1576 | ||
| Grand Prix Mexico City 2016 (OGW limited) | starting rating: 1516 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 112 | Gutierrez Jimenez, Felix German (1500) | Won 2-0 | +181534 |
| 2sealed | 95 | Orlanzzini Arreguin, Diego (1518) | Draw 1-1 | 01534 |
| 3sealed | 160 | Navarro Rangel, Salvador (1518) | Won 2-1 | +171551 |
| 4sealed | 82 | Melecio, Jose Carlos (1537) | Draw 1-1 | 01551 |
| 5sealed | 149 | Dominguez Cruz, Jorge Hugo (1518) | Lost 1-2 | -191532 |
| 6sealed | 212 | Grecida Avila, Ramses Leonardo de la Lanza (1519) | Lost 1-2 | -181514 |
| 7sealed | 261 | Hubbard, Pablo (1483) | Won 2-0 | +181532 |
| 8sealed | 205 | Torres, Jonathan (1572) | Won 2-0 | +181550 |
| 9sealed | 155 | de Castro, Leonardo (1681) | Won 2-1 | +211571 |
| top | average opponent: 1538record: 5-2-2 | new rating: 1571 | ||
| Grand Prix Porto Alegre 2015 (modern) | starting rating: 1444 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 66 | Salla, Augusto (1500) | Lost 0-2 | -171427 |
| 2modern | 234 | De Albuquerque Frassy, Igor (1482) | Won 2-0 | +191446 |
| 3modern | 276 | Lixandrao, Murilo Luis (1565) | Lost 1-2 | -151431 |
| 4modern | 276 | Coutinho, Marcelo (1585) | Won 2-0 | +201451 |
| 5modern | 200 | Fonseca, Pedro (1506) | Won 2-0 | +191470 |
| 6modern | 171 | Cartechini, Mariano (1762) | Lost 0-2 | -131457 |
| 7modern | 196 | Arntz, Estevao Rudi (1603) | Won 2-0 | +211478 |
| 8modern | 130 | Prais, Raphael (1518) | Won 2-0 | +191497 |
| 9modern | 85 | Pena Congregado, Nahuel (1573) | Won 2-0 | +191516 |
| top | average opponent: 1566record: 6-3 | new rating: 1516 | ||
| Grand Prix Sao Paulo 2015 (DTK standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 295 | Pessis Carneiro Kern, Robson (1529) | Lost 0-2 | -171483 |
| 2standard | 460 | Gaspar, Carlos Jose (1482) | Won 2-0 | +181501 |
| 3standard | 395 | Fama Marinho, Diego (1381) | Lost 1-2 | -211480 |
| 4standard | 513 | de Souza Pedro Junior, Ednei (1483) | Won 2-0 | +181498 |
| 5standard | 291 | Mokarzel Baldassin, Bruno (1446) | Lost 1-2 | -191479 |
| 6standard | 428 | Sanches, Gregorio (1482) | Lost 0-2 | -181461 |
| 7standard | 382 | Montini, Fabio A (1508) | Lost 0-2 | -171444 |
| top | average opponent: 1473record: 2-5 | new rating: 1444 | ||