Kosonen, Jona
Current rating: 1416
Record: 2-7
| Grand Prix Oslo 2001 (Invasion block) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 4block | 3 | Batbukt, Morten (1500) | Lost 0-2 | -171429 |
| 5block | 36 | Skjetne, Endre Helgesen (1488) | Lost 1-2 | -171412 |
| 6block | 56 | Keibel, Karsten (1522) | Lost 1-2 | -161396 |
| 7block | 71 | Nilssen, Jan Olav (1501) | Won 2-1 | +201416 |
| average opponent: 1503record: 1-3 | new rating: 1416 | |||
| Grand Prix Helsinki 2000 (INV limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 116 | Salovaara, Jussi (1521) | Lost 1-2 | -181482 |
| 2sealed | 129 | Erasaari, Olli (1482) | Lost 0-2 | -181464 |
| 3sealed | 148 | Kuusela, Juho (1464) | Won 2-0 | +181482 |
| 4sealed | 115 | Karmanov, Dmitry (1482) | Lost 1-2 | -181464 |
| 5sealed | 154 | Karhula, Aleksi (1464) | Lost 0-2 | -181446 |
| average opponent: 1483record: 1-4 | new rating: 1446 | |||