Puijk, Koen
Current rating: 1550
Record: 9-7
| Grand Prix Brussels 2018 (M19 standard) | starting rating: 1507 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 200 | Huepper, Florian (1575) | Won 2-1 | +191526 |
| 2standard | 84 | Brunetti, Alessandro (1505) | Lost 1-2 | -181508 |
| 3standard | 441 | Schrijvers, Hans (1715) | Lost 0-2 | -151493 |
| 4standard | 458 | Collins, James (1423) | Won 2-0 | +171510 |
| 5standard | 403 | Romano, Simone (1499) | Won 2-0 | +181528 |
| 6standard | 255 | Dijt, Sven (1643) | Lost 1-2 | -161512 |
| 7standard | 333 | Bartolini, Marco (1518) | Won 2-0 | +181530 |
| 8standard | 220 | Fliegel, Lukasz (1632) | Won 2-0 | +201550 |
| average opponent: 1564record: 5-3 | new rating: 1550 | |||
| Grand Prix Copenhagen 2018 (DOM standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 130 | Reinula, Joosep (1500) | Won 2-1 | +181518 |
| 2standard | 126 | Romero-Bagger, Victor (1518) | Won 2-1 | +181536 |
| 3standard | 104 | Proll, Markus (1479) | Won 2-0 | +171553 |
| 4standard | 25 | Calf, David (1867) | Lost 0-2 | -121541 |
| 5standard | 74 | Tornstrom, Lauri (1528) | Lost 0-2 | -191522 |
| 6standard | 159 | Nuttall, Daniel (1586) | Lost 1-2 | -171505 |
| 7standard | 197 | Soberg, Sebastian (1421) | Won 2-0 | +171522 |
| 8standard | 157 | Campbell, Gary (1685) | Lost 0-2 | -151507 |
| average opponent: 1573record: 4-4 | new rating: 1507 | |||