Ostmann, Mark
Current rating: 1360
Record: 4-12
| Grand Prix Brussels 2020 (pioneer) | starting rating: 1430 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 396 | Jungjohann, Marc (1500) | Lost 0-2 | -171413 |
| 2pioneer | 480 | Bone, Constantin (1482) | Won 2-0 | +191432 |
| 3pioneer | 445 | Pedrero, Yves (1426) | Lost 0-2 | -181414 |
| 4pioneer | 747 | Paty, Jeremie (1350) | Lost 0-2 | -191395 |
| 5pioneer | 672 | Maillet, Gilles (1462) | Lost 1-2 | -171378 |
| 6pioneer | 620 | Luc, Laurencon (1442) | Won 2-1 | +191397 |
| 7pioneer | 481 | Piegsa, David (1427) | Lost 1-2 | -171380 |
| 8pioneer | 418 | Chierzi, Fabrizio (1281) | Lost 1-2 | -201360 |
| average opponent: 1421record: 2-6 | new rating: 1360 | |||
| Grand Prix Strasbourg 2019 (RNA limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 369 | Quinzain, Guillaume (1500) | Lost 1-2 | -181482 |
| 2sealed | 579 | Reibel, Alexis (1482) | Lost 0-2 | -181464 |
| 3sealed | 730 | Weber, Patrick (1463) | Lost 1-2 | -181446 |
| 4sealed | 742 | Terroy, Cyril (1675) | Lost 0-2 | -141432 |
| 5sealed | 667 | Regnault, Lea (1319) | Won 2-0 | +161448 |
| 6sealed | 569 | Goepel, Michael (1434) | Won 2-0 | +181466 |
| 7sealed | 473 | Desportes, Gabriel (1461) | Lost 0-2 | -181448 |
| 8sealed | 410 | Giangrandi, Filippo (1438) | Lost 1-2 | -181430 |
| average opponent: 1471record: 2-6 | new rating: 1430 | |||