Sieber, Jan
Current rating: 1450
Record: 5-8
| Grand Prix Prague 2003 (LGN limited) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 51 | Schreiber, Christoph (1500) | Won 2-1 | +191483 |
| 2sealed | 28 | Saluda, Stanislaw (1520) | Lost 1-2 | -171466 |
| 3sealed | 202 | Valyi Nagy, Gabor (1466) | Lost 1-2 | -181448 |
| 4sealed | 356 | Panchartek, Zbysek (1483) | Won 2-0 | +181466 |
| 5sealed | 267 | Broer, Jan (1543) | Lost 1-2 | -161450 |
| average opponent: 1502record: 2-3 | new rating: 1450 | |||
| Grand Prix Prague 2001 (PLS limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 138 | Slunecko, Ondrej (1500) | Won 2-0 | +181518 |
| 2sealed | 101 | Platzer, Lubos (1518) | Lost 0-2 | -181500 |
| 3sealed | 215 | Showers, Chris (1493) | Lost 1-2 | -181482 |
| 4sealed | 244 | Vogler, Sebastian (1482) | Lost 0-2 | -181464 |
| 5sealed | 238 | Jan, Zikes (1465) | Won 2-0 | +181482 |
| 6sealed | 219 | Gruber, Tobias (1547) | Lost 1-2 | -171465 |
| 7sealed | 217 | Jan, Hlad (1464) | Lost 1-2 | -181447 |
| 8sealed | 182 | Gobel, Jindrich (1414) | Won 2-0 | +171464 |
| average opponent: 1485record: 3-5 | new rating: 1464 | |||