Zak, Krzysztof
Current rating: 1419
Record: 12-18-2
| Grand Prix Leipzig 2005 (BOK limited) | starting rating: 1430 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 136 | Ceballos, Arturo (1500) | Won 2-1 | +191449 |
| 2sealed | 40 | Kircher, Sebastian (1518) | Won 2-0 | +191468 |
| 3sealed | 42 | Lysak, Zdenek (1738) | Lost 0-2 | -131455 |
| 4sealed | 106 | Smink, Robert (1489) | Lost 1-2 | -171438 |
| 5sealed | 142 | Baierhofer, Horst (1419) | Lost 0-2 | -191419 |
| top | average opponent: 1533record: 2-3 | new rating: 1419 | ||
| Grand Prix Vienna 2004 (COK limited) | starting rating: 1484 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 282 | Fabbrizio, Paolo (1447) | Lost 0-2 | -191465 |
| 2sealed | 325 | Ritzmann, Mathias (1501) | Lost 0-2 | -171448 |
| 3sealed | 413 | Sollner, Christian (1432) | Lost 1-2 | -181430 |
| top | average opponent: 1460record: 0-3 | new rating: 1430 | ||
| Grand Prix Heidelberg 2002 (TOR limited) | starting rating: 1436 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 133 | Cichon, Marco (1500) | Draw 1-1 | +11437 |
| 2sealed | 228 | Hennig, Christoph (1498) | Won 2-1 | +191456 |
| 3sealed | 145 | Weber, Antonin (1612) | Lost 1-2 | -151441 |
| 4sealed | 250 | Hartmann, Urs (1533) | Won 2-1 | +201461 |
| 5sealed | 178 | Ta, Luc (1524) | Won 2-0 | +191480 |
| 6sealed | 102 | Gysser, Marc (1534) | Draw 1-1 | +11481 |
| 7sealed | 122 | Bosler, Fabian (1536) | Lost 1-2 | -171464 |
| 8sealed | 128 | Kopp, Peter (1588) | Won 2-1 | +201484 |
| top | average opponent: 1540record: 4-2-2 | new rating: 1484 | ||
| Grand Prix Warsaw 2001 (Invasion block) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 32 | Liptak, Karoly (1652) | Lost 1-2 | -151449 |
| 2block | 147 | Rieff, Menno (1513) | Lost 1-2 | -171432 |
| 3block | 173 | Bugaenko, Igor (1499) | Lost 0-2 | -161416 |
| 4block | 190 | Szylz, Piotr (1446) | Won 2-1 | +181434 |
| 5block | 159 | Kryvosheiev, Sergii (1465) | Won 2-0 | +191453 |
| 6block | 132 | Koper, Michael (1489) | Won 2-1 | +181471 |
| 7block | 97 | Zalejski, Michal (1482) | Lost 1-2 | -171454 |
| 8block | 105 | Priimagi, Tristan (1480) | Lost 1-2 | -181436 |
| top | average opponent: 1503record: 3-5 | new rating: 1436 | ||
| Grand Prix Prague 2001 (PLS limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 106 | Coka, Petr (1507) | Lost 1-2 | -181482 |
| 2sealed | 203 | Stefan, Jan (1482) | Won 2-0 | +181500 |
| 3sealed | 164 | Vasicek, Martin (1499) | Lost 1-2 | -181482 |
| 4sealed | 191 | Bauer, Tomas (1464) | Lost 0-2 | -181464 |
| 5sealed | 258 | Solich, Michal (1464) | Lost 1-2 | -181446 |
| 6sealed | 236 | Skotnica, Tomas (1446) | Won 2-0 | +181464 |
| 7sealed | 213 | Cerny, Jiri (1467) | Won 2-0 | +181482 |
| 8sealed | 167 | Wojciechowski, Dawid (1480) | Lost 0-2 | -181464 |
| top | average opponent: 1476record: 3-5 | new rating: 1464 | ||