Koek, Joris
Current rating: 1431
Record: 5-10
| Grand Prix Bologna 2019 (legacy) | starting rating: 1441 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 187 | Lucania, Andrea (1500) | Lost 1-2 | -161425 |
| 2legacy | 526 | Sajjad, Hamza (1427) | Won 2-0 | +181443 |
| 3legacy | 518 | Elez, Goran (1637) | Won 2-0 | +211464 |
| 4legacy | 412 | Carstensen, Morten (1587) | Lost 1-2 | -161448 |
| 5legacy | 571 | Lebesbye, Torgeir (1477) | Lost 1-2 | -171431 |
| top | average opponent: 1526record: 2-3 | new rating: 1431 | ||
| Grand Prix Birmingham 2018 (leg) (legacy) | starting rating: 1452 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 54 | Jefferys, Eddy (1466) | Lost 0-2 | -181434 |
| 2legacy | 342 | Brazell, Michael (1517) | Won 2-1 | +201454 |
| 3legacy | 300 | Bastiaens, Yannick (1499) | Won 2-1 | +181472 |
| 4legacy | 249 | Krejsa, Tomas (1712) | Lost 1-2 | -131459 |
| 5legacy | 370 | Mcdonald, Joshua (1497) | Lost 1-2 | -181441 |
| top | average opponent: 1538record: 2-3 | new rating: 1441 | ||
| Grand Prix Utrecht 2017 (AER standard) | starting rating: 1488 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 66 | Lehmacher, Max (1500) | Lost 1-2 | -171471 |
| 2standard | 411 | Gomez Galvan, Carlos (1432) | Lost 0-2 | -191452 |
| top | average opponent: 1466record: 0-2 | new rating: 1452 | ||
| Grand Prix Utrecht 2015 (MM2 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 395 | Meyer, Stephan (1752) | Lost 1-2 | -131487 |
| 2sealed | 432 | Taboada De La Fuente, (1480) | Won 2-0 | +171504 |
| 3sealed | 348 | van der End, Martijn (1611) | Lost 0-2 | -161488 |
| top | average opponent: 1615record: 1-2 | new rating: 1488 | ||