Sielski, Piotr
Current rating: 1424
Record: 25-38
| Grand Prix Krakow 2019 (M20 limited) | starting rating: 1402 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 397 | Choma, Filip (1500) | Won 2-0 | +201422 |
| 2sealed | 466 | Lindgren, Tommi (1726) | Won 2-1 | +231445 |
| 3sealed | 263 | Oliveros, Carlos (1715) | Lost 1-2 | -131432 |
| 4sealed | 290 | Szyk, Andrzej (1492) | Won 2-0 | +191451 |
| 5sealed | 169 | Cupal, Dominik (1700) | Lost 0-2 | -131438 |
| 6sealed | 237 | Muller, Tomas (1667) | Lost 0-2 | -141424 |
| top | average opponent: 1633record: 3-3 | new rating: 1424 | ||
| Grand Prix Prague 2019 (UMA limited) | starting rating: 1359 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 363 | De Haan, Rob (1731) | Lost 1-2 | -111348 |
| 4sealed | 696 | Schreck, Alexander (1729) | Won 2-0 | +241372 |
| 5sealed | 330 | Karesvuori, Karo (1728) | Won 2-0 | +251397 |
| 6sealed | 202 | Tomelitsch, Patrick (1840) | Won 2-0 | +251422 |
| 7sealed | 47 | Rinehart-Jones, Charlie (1849) | Lost 0-2 | -101412 |
| 8sealed | 154 | Nuijten, Julien (1925) | Lost 0-2 | -101402 |
| top | average opponent: 1800record: 3-3 | new rating: 1402 | ||
| Grand Prix Warsaw 2018 (GRN limited) | starting rating: 1400 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 294 | Luty, Leszek (1759) | Won 2-1 | +241424 |
| 2sealed | 398 | Wrobel, Lukasz (1518) | Lost 1-2 | -161408 |
| 3sealed | 688 | Graenge, Martin (1499) | Lost 0-2 | -161392 |
| 4sealed | 791 | Banasik, Marek (1466) | Lost 0-2 | -171375 |
| 5sealed | 765 | Reymondin, Achille (1507) | Lost 0-2 | -161359 |
| top | average opponent: 1550record: 1-4 | new rating: 1359 | ||
| Grand Prix Prague 2014 (modern) | starting rating: 1357 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 322 | Nielsen, Fredrik (1461) | Won 2-0 | +201377 |
| 2modern | 27 | Ferrari, Stefano (1586) | Won 2-1 | +211398 |
| 3modern | 291 | Lewandowski, Bartlomiej (1543) | Lost 0-2 | -151383 |
| 4modern | 218 | Prystav, Fabian (1395) | Lost 0-2 | -181365 |
| 5modern | 386 | Van Goethem, Stijn (1799) | Won 2-0 | +261391 |
| 6modern | 232 | Keller, Stephan (1531) | Won 2-1 | +201411 |
| 7modern | 284 | Herrero, Ignacio (1502) | Lost 0-2 | -161395 |
| 8modern | 302 | Thorsboe Lundblad, Asger (1556) | Lost 0-2 | -151380 |
| 9modern | 301 | Borsari, Andrea (1497) | Won 2-1 | +201400 |
| top | average opponent: 1541record: 5-4 | new rating: 1400 | ||
| Grand Prix Warsaw 2013 (M14 standard) | starting rating: 1392 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 24 | Pilorz, Michal (1500) | Lost 0-2 | -161376 |
| 2standard | 270 | Stawicki, Bartek (1484) | Won 2-0 | +201396 |
| 3standard | 242 | Glied, Tamas (1810) | Lost 0-1 | -111385 |
| 4standard | 431 | Dawid, Pascal (1449) | Lost 1-2 | -171368 |
| 5standard | 427 | Miczajka, Marek (1448) | Lost 0-2 | -161352 |
| 6standard | 441 | Bergsma, Dennis (1431) | Won 2-0 | +191371 |
| 7standard | 367 | Kulczynski, Kamil (1563) | Lost 0-2 | -141357 |
| top | average opponent: 1527record: 2-5 | new rating: 1357 | ||
| Grand Prix Lille 2012 (DKA standard) | starting rating: 1376 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 666 | Pietkiewicz, Tomasz (1516) | Won 2-0 | +211397 |
| 3standard | 513 | Wuensche, Daniel (1518) | Lost 0-2 | -161381 |
| 4standard | 654 | Roux, Mickael (1483) | Lost 0-2 | -161365 |
| 5standard | 756 | Beaumecker, Mickael (1467) | Lost 0-2 | -161349 |
| 6standard | 765 | Bondon, Pierre (1447) | Won 2-0 | +191368 |
| 7standard | 720 | Le Frioux, Yann (1506) | Won 2-0 | +211389 |
| 8standard | 659 | Portnoe, Loic (1533) | Lost 0-2 | -161373 |
| 9standard | 680 | Espargiliere, Bastien (1410) | Won 2-0 | +191392 |
| top | average opponent: 1485record: 4-4 | new rating: 1392 | ||
| Grand Prix Milan 2011 (ISD limited) | starting rating: 1395 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 520 | Espenlaub, Edward (1558) | Lost 0-2 | -151380 |
| 5sealed | 676 | Couceiro, Joao (1537) | Won 2-1 | +211401 |
| 6sealed | 560 | Delisi, Riccardo (1499) | Won 2-1 | +201421 |
| 7sealed | 552 | Skiba, Jacek (1644) | Lost 1-2 | -141407 |
| 8sealed | 569 | De Nicola, Giacomo (1515) | Lost 1-2 | -161391 |
| 9sealed | 622 | Sauvain, Romain (1569) | Lost 0-2 | -151376 |
| top | average opponent: 1553record: 2-4 | new rating: 1376 | ||
| Grand Prix Prague 2009 (M10 limited) | starting rating: 1462 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 218 | Janak, Tomas (1617) | Lost 1-2 | -151447 |
| 2sealed | 256 | Komora, Martin (1480) | Won 2-1 | +181465 |
| 3sealed | 193 | Markov, Daniel (1449) | Lost 0-2 | -181447 |
| 4sealed | 335 | Hajek, Radim (1481) | Lost 0-2 | -171430 |
| 5sealed | 315 | Wojcik, Maciej (1469) | Lost 0-2 | -181412 |
| 6sealed | 280 | Knap, Cestmir (1445) | Won 2-0 | +191431 |
| 7sealed | 219 | Kovacs, Szilveszter (1416) | Lost 1-2 | -181413 |
| 8sealed | 184 | Jemiolek, Jakub (1445) | Lost 1-2 | -181395 |
| top | average opponent: 1475record: 2-6 | new rating: 1395 | ||
| Grand Prix Hanover 2009 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 470 | Hinkel, Thomas (1492) | Won 2-1 | +181518 |
| 2extended | 447 | Clara, Pere (1518) | Lost 0-2 | -181500 |
| 3extended | 500 | Lange, Philipp (1502) | Lost 0-2 | -181482 |
| 4extended | 606 | Wong, Chen Win (1449) | Lost 0-2 | -191463 |
| 5extended | 586 | Bohler, Marius (1466) | Won 2-0 | +181481 |
| 6extended | 568 | Wouters, Robin (1437) | Lost 0-2 | -181463 |
| 7extended | 552 | Chomen, Detlef (1463) | Lost 0-2 | -181445 |
| 8extended | 531 | Durr-frederiksen, Kenneth (1415) | Won 2-1 | +171462 |
| top | average opponent: 1468record: 3-5 | new rating: 1462 | ||