Sieslak, Piotr
Current rating: 1379
Record: 1-8-1
| Grand Prix Warsaw 2014 (JOU limited) | starting rating: 1429 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 143 | Guesnel, Quentin (1434) | Lost 0-2 | -181411 |
| 2sealed | 342 | Rohman, Nicklas (1379) | Lost 0-2 | -191392 |
| 3sealed | 446 | Segues Blanco, Carles (1464) | Won 2-1 | +201412 |
| 4sealed | 426 | Paalvast, Mike (1487) | Lost 1-2 | -171395 |
| 5sealed | 397 | Toltsch, Roman (1511) | Lost 0-2 | -161379 |
| average opponent: 1455record: 1-4 | new rating: 1379 | |||
| Grand Prix Warsaw 2013 (M14 standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 144 | Takagi, Piotr (1500) | Lost 0-2 | -181482 |
| 2standard | 299 | Oswald, Wolfgang (1483) | Lost 0-2 | -181464 |
| 3standard | 370 | Rudkowski, Krzysztof (1508) | Lost 0-2 | -171447 |
| 4standard | 480 | Komsta, Franek (1450) | Draw 1-1 | 01447 |
| 5standard | 459 | Karlsson, Malthe (1445) | Lost 0-2 | -181429 |
| average opponent: 1477record: 0-4-1 | new rating: 1429 | |||