Costa, Ronald
Current rating: 1384
| Grand Prix Liverpool 2017 (XLN limited) | starting rating: 1402 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 95 | Hammersley, Lee (1425) | Lost 0-2 | -181384 |
| top | record: 0-1 | new rating: 1384 | ||
| Grand Prix London 2016 (KLD limited) | starting rating: 1427 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 297 | Benczedi, Jozsef (1656) | Lost 0-2 | -141413 |
| 2sealed | 433 | Buse, Jan (1482) | Draw 1-1 | +21415 |
| 3sealed | 1052 | Tait, Sophie (1482) | Won 2-1 | +191434 |
| 4sealed | 794 | Hoydonckx, Yves (1581) | Lost 1-2 | -151419 |
| 5sealed | 938 | Mampaey, Herwig (1504) | Lost 1-2 | -171402 |
| top | average opponent: 1541record: 1-3-1 | new rating: 1402 | ||
| Grand Prix Manchester 2016 (SOI standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 439 | Smith, Timothy (1527) | Lost 0-2 | -181482 |
| 2standard | 582 | Beamish, Cody (1389) | Lost 0-2 | -191463 |
| 3standard | 785 | Pouwels, Patrick (1488) | Lost 1-2 | -181445 |
| 4standard | 804 | Larkman, Christopher (1446) | Lost 1-2 | -181427 |
| top | average opponent: 1463record: 0-4 | new rating: 1427 | ||