Petersell, Olgerd
Current rating: 1501
Record: 4-4
| Grand Prix Helsinki 2004 (COK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 41 | Lunkka, Kalle (1500) | Won 2-1 | +181518 |
| 2sealed | 38 | Pedersen, Soren (1591) | Won 2-1 | +191537 |
| 3sealed | 28 | Tagunov, Denis (1580) | Lost 0-2 | -171520 |
| 4sealed | 100 | Lehnert, Heiko (1524) | Lost 0-2 | -181502 |
| 5sealed | 143 | Tuomi, Sami (1450) | Lost 1-2 | -191483 |
| 6sealed | 132 | Jokinen, Kosti (1481) | Lost 1-2 | -181465 |
| 7sealed | 136 | Sillanpaa, Tuomo (1467) | Won 2-0 | +181483 |
| 8sealed | 106 | Ruppell, Timo (1481) | Won 2-0 | +181501 |
| average opponent: 1509record: 4-4 | new rating: 1501 | |||