Koster, Rob
Current rating: 1510
Record: 18-17-2
| Grand Prix Copenhagen 2018 (DOM standard) | starting rating: 1587 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 85 | Sorensen, Mattias (1517) | Lost 1-2 | -191568 |
| 3standard | 211 | Rogild, Johan (1500) | Won 2-0 | +171585 |
| 4standard | 133 | Silvestre, Vicent (1712) | Lost 1-2 | -161569 |
| 5standard | 291 | Wessels, Dimitri (1502) | Lost 0-2 | -191550 |
| 6standard | 275 | Bluchet, Damien (1440) | Lost 1-2 | -201530 |
| 7standard | 270 | Axelson, Oskar (1427) | Lost 0-2 | -201510 |
| top | average opponent: 1516record: 1-5 | new rating: 1510 | ||
| Grand Prix Lyon 2018 (modern) | starting rating: 1546 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 610 | Romay, Lucas (1701) | Lost 0-2 | -161530 |
| 2modern | 818 | Berthoux, Jeremy (1786) | Won 2-1 | +231553 |
| 3modern | 656 | Kuntz, Thomas (1502) | Lost 1-2 | -191534 |
| 4modern | 908 | Chardon, Raphael (1481) | Won 2-1 | +171551 |
| 5modern | 507 | Mazzarese, Romain (1542) | Won 2-0 | +181569 |
| 6modern | 328 | Fagot, Alexandre (1511) | Won 2-1 | +171586 |
| 7modern | 224 | Soumet, Arnaud (1778) | Lost 1-2 | -151571 |
| 8modern | 377 | Boonen, Lars (1454) | Won 2-1 | +161587 |
| top | average opponent: 1594record: 5-3 | new rating: 1587 | ||
| Grand Prix London 2018 (RIX limited) | starting rating: 1514 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 481 | Rowe, Clive (1446) | Lost 0-2 | -191495 |
| 2sealed | 590 | Horlock, Rhys (1591) | Lost 0-2 | -161479 |
| 3sealed | 908 | Schonthal, Jannik (1465) | Lost 1-2 | -181461 |
| 4sealed | 939 | Powell, Robert (1451) | Won 2-0 | +171478 |
| 5sealed | 847 | Puschmann, Daniel (1463) | Won 2-0 | +181496 |
| 6sealed | 698 | Curto, Eduardo (1416) | Won 2-1 | +171513 |
| 7sealed | 490 | Kopfli, Hugo (1465) | Won 2-0 | +171530 |
| 8sealed | 436 | Trotobas, Bastien (1414) | Won 2-1 | +161546 |
| top | average opponent: 1464record: 5-3 | new rating: 1546 | ||
| Grand Prix Birmingham 2017 (modern) | starting rating: 1516 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 476 | Pettersen, Bjorn-Andreas (1500) | Draw 1-1 | 01516 |
| 2modern | 427 | Esguevillas, Luis (1511) | Won 0-0 | +181534 |
| 3modern | 380 | Berglund, Bjorn (1485) | Lost 0-2 | -191515 |
| 4modern | 561 | Burger, Martin (1536) | Lost 0-2 | -181497 |
| 5modern | 676 | Sumner, Dean (1482) | Won 2-1 | +181515 |
| 6modern | 522 | Hartley, James (1629) | Lost 1-2 | -161499 |
| 7modern | 610 | Bouquet, Yves (1442) | Won 2-0 | +171516 |
| 8modern | 489 | Voces Alvarez, Luis (1476) | Won 2-1 | +171533 |
| 9modern | 376 | Theobalds, Graham (1474) | Lost 0-2 | -191514 |
| top | average opponent: 1504record: 4-4-1 | new rating: 1514 | ||
| Grand Prix Utrecht 2014 (M15 standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 211 | Stremer, Jens (1500) | Won 2-0 | +181518 |
| 2standard | 202 | Dineva, Stella (1434) | Lost 1-2 | -201498 |
| 3standard | 479 | Noorlander, Niels (1743) | Won 2-0 | +231521 |
| 4standard | 230 | Sacco, Sergio (1286) | Draw 1-1 | -41517 |
| 5standard | 327 | Farber, Florian (1520) | Won 2-0 | +181535 |
| 6standard | 202 | Pereira, Jordao (1511) | Lost 0-2 | -191516 |
| top | average opponent: 1499record: 3-2-1 | new rating: 1516 | ||