Kosonen, Jaakko
Current rating: 1415
| Grand Prix Copenhagen 2019 (MH1 limited) | starting rating: 1439 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 34 | Sairanen, Benjamin (1526) | Lost 0-2 | -171422 |
| 2sealed | 364 | Espenhein, Rune (1675) | Lost 1-2 | -131409 |
| 3sealed | 608 | Larssen, Daniel (1465) | Won 2-0 | +191428 |
| 4sealed | 536 | Puri, Daniele (1693) | Lost 0-2 | -131415 |
| top | average opponent: 1589record: 1-3 | new rating: 1415 | ||
| Grand Prix Stockholm 2018 (modern) | starting rating: 1430 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 141 | Cottell, Douglas (1500) | Lost 0-2 | -171413 |
| 2modern | 314 | Racz, Gabor (1479) | Lost 0-2 | -171396 |
| 3modern | 557 | Hansson-Bergen, Mattias (1463) | Lost 1-2 | -171379 |
| 4modern | 603 | Kohler, Johan (1445) | Won 2-1 | +201399 |
| 5modern | 536 | Bistrom, Frans (1462) | Won 2-0 | +191418 |
| 6modern | 449 | Sanfridsson, Peter (1476) | Won 2-0 | +191437 |
| 7modern | 308 | Fischer, Sven (1484) | Won 2-1 | +191456 |
| 8modern | 256 | Asbrink, Romis (1527) | Lost 1-2 | -171439 |
| top | average opponent: 1480record: 4-4 | new rating: 1439 | ||
| Grand Prix Copenhagen 2017 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 123 | Sjoo, Rasmus (1500) | Lost 0-2 | -181482 |
| 2modern | 603 | Michelsen, Mark (1675) | Lost 0-2 | -151467 |
| 3modern | 840 | Skotte, Mark (1456) | Lost 0-2 | -181449 |
| 4modern | 890 | Huber, Andreas (1359) | Lost 0-2 | -191430 |
| top | average opponent: 1497record: 0-4 | new rating: 1430 | ||