Koster, Jeroen
Current rating: 1373
| Grand Prix Manchester 2016 (SOI standard) | starting rating: 1378 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 94 | Kiourtsoglou, Vasileios (1489) | Won 2-0 | +201398 |
| 2standard | 322 | Drake, George (1518) | Lost 0-2 | -161382 |
| 3standard | 625 | Waters, Mitch (1500) | Lost 0-2 | -161366 |
| 4standard | 742 | Bain, Lee (1430) | Won 2-0 | +201386 |
| 5standard | 559 | Whiting, Luke (1501) | Won 2-0 | +201406 |
| 6standard | 426 | Hart-Bryan, Jordan (1519) | Lost 1-2 | -161390 |
| 7standard | 466 | Corless, Josh (1440) | Lost 0-2 | -171373 |
| top | average opponent: 1485record: 3-4 | new rating: 1373 | ||
| Grand Prix Brussels 2015 (BFZ standard) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 298 | Sierk, Kolja (1446) | Lost 0-0 | -181428 |
| 2standard | 627 | Raffoux, Benjamin (1441) | Lost 0-0 | -181410 |
| 3standard | 919 | Lazarides, Nicolas (1467) | Draw 1-1 | +11411 |
| 4standard | 880 | Friedli, Johan (1503) | Lost 1-2 | -161395 |
| 5standard | 843 | Aleksandrov, Juri (1463) | Lost 0-1 | -171378 |
| top | average opponent: 1464record: 0-4-1 | new rating: 1378 | ||
| Grand Prix Utrecht 2015 (MM2 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 281 | Boulic, Audren (1473) | Lost 0-2 | -181482 |
| 2sealed | 564 | Wu, King-Yip (1492) | Won 2-0 | +181500 |
| 3sealed | 364 | Ulker, Zeynel (1482) | Draw 1-1 | -11499 |
| 4sealed | 443 | Van Herreweghe, Gertjan (1501) | Lost 0-2 | -181481 |
| 5sealed | 503 | Ivanov, Anton (1512) | Lost 1-2 | -171464 |
| 6sealed | 447 | Dirven, Tim (1464) | Lost 0-2 | -181446 |
| top | average opponent: 1487record: 1-4-1 | new rating: 1446 | ||