Piskorz, Jan
Current rating: 1526
Record: 8-7
| Grand Prix Warsaw 2014 (JOU limited) | starting rating: 1517 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 183 | Kmet, Adam (1495) | Lost 1-2 | -181499 |
| 2sealed | 322 | Wilk, Piotr (1481) | Won 2-1 | +171516 |
| 3sealed | 399 | Buczkowski, Sylwester (1485) | Lost 0-2 | -181498 |
| 4sealed | 396 | Kopec, Mateusz (1631) | Won 2-0 | +201518 |
| 5sealed | 259 | Liebner, Jan (1625) | Won 2-0 | +201538 |
| 6sealed | 165 | Dickmann, Fabian (1869) | Lost 1-2 | -121526 |
| average opponent: 1598record: 3-3 | new rating: 1526 | |||
| Grand Prix Prague 2013 (M14 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 92 | Ketzl, Tomas (1500) | Lost 1-2 | -181482 |
| 2sealed | 442 | Schmittbuettner, Markus (1446) | Won 2-0 | +171499 |
| 3sealed | 452 | Polok, Przemyslaw (1428) | Won 2-0 | +171516 |
| 4sealed | 309 | Gerhardt, Rostislav (1478) | Won 2-1 | +171533 |
| 5sealed | 294 | Broinger, Francis (1594) | Lost 0-2 | -171516 |
| 6sealed | 341 | Huber, David (1397) | Won 2-0 | +161532 |
| 7sealed | 191 | Artamonova, Maria (1723) | Lost 0-2 | -141518 |
| 8sealed | 253 | Klein, Kora (1472) | Lost 0-2 | -191499 |
| 9sealed | 292 | Kuhmel, Danny (1515) | Won 2-0 | +181517 |
| average opponent: 1506record: 5-4 | new rating: 1517 | |||