Pekkonen, Tatu
Current rating: 1498
Record: 4-4
| Grand Prix Helsinki 2004 (COK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 23 | Vettenranta, Leif (1395) | Won 2-1 | +161516 |
| 2sealed | 74 | Pirttiniemi, Seppo (1518) | Lost 0-2 | -181498 |
| 3sealed | 84 | Kellomaki, Timo (1501) | Won 2-1 | +181516 |
| 4sealed | 94 | Roinisto, Mika (1434) | Won 2-0 | +171533 |
| 5sealed | 60 | Aaltonen, Sebastian (1542) | Won 2-1 | +181551 |
| 6sealed | 22 | Harkonen, Jarno (1650) | Lost 0-2 | -161535 |
| 7sealed | 77 | Lindqvist, Kristoffer (1571) | Lost 1-2 | -181517 |
| 8sealed | 79 | Kovelo, Ville (1469) | Lost 1-2 | -191498 |
| average opponent: 1510record: 4-4 | new rating: 1498 | |||