Kosierkiewicz, Ernest
Current rating: 1451
Record: 15-23-2
| Grand Prix Krakow 2019 (M20 limited) | starting rating: 1466 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 257 | Glizniewicz, Piotr (1544) | Won 2-1 | +201486 |
| 4sealed | 93 | Grefling, Jakub (1562) | Won 2-0 | +191505 |
| 5sealed | 9 | Li, Nick (2015) | Lost 1-2 | -91496 |
| 6sealed | 128 | Silva, Ernesto (1556) | Lost 1-2 | -171479 |
| 7sealed | 238 | Fries, Stefan (1915) | Lost 1-2 | -111468 |
| 8sealed | 347 | Riman, Vit (1539) | Lost 0-2 | -171451 |
| top | average opponent: 1688record: 2-4 | new rating: 1451 | ||
| Grand Prix Warsaw 2018 (GRN limited) | starting rating: 1401 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 163 | Zapadka, Michal (1500) | Won 2-1 | +201421 |
| 2sealed | 2 | Johansson, Jens (1666) | Lost 1-2 | -141407 |
| 3sealed | 633 | Makowsky-Stoll, Oliver (1551) | Won 2-1 | +211428 |
| 4sealed | 423 | Maturana, Are (1504) | Won 2-0 | +191447 |
| 5sealed | 132 | Koziel, Mariusz (1550) | Draw 1-1 | +21449 |
| 6sealed | 262 | Kildal, Marius (1550) | Won 2-1 | +201469 |
| 7sealed | 158 | Staciwa, Marcin (1850) | Won 2-1 | +251494 |
| 8sealed | 94 | Kyhn, Benjamin (1581) | Won 2-1 | +191513 |
| 9sealed | 58 | Garcia Marquez, Ivan (1607) | Lost 1-2 | -161497 |
| 10draft | 231 | Hermite, Thomas (1728) | Lost 1-2 | -141483 |
| 11draft | 376 | Pancini, Marco (1754) | Lost 0-2 | -131470 |
| 13draft | 351 | Riegel, Julian (1626) | Lost 0-2 | -151455 |
| 14draft | 235 | Hansen, Martin (1704) | Won 2-1 | +221477 |
| 15draft | 296 | Penko, Matic (1884) | Lost 1-2 | -111466 |
| top | average opponent: 1647record: 7-6-1 | new rating: 1466 | ||
| Grand Prix Prague 2015 (ORI standard) | starting rating: 1422 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 337 | Makowski, Kamil (1567) | Won 2-0 | +211443 |
| 2standard | 172 | Piatkiewicz, Pawel (1500) | Won 2-0 | +191462 |
| 3standard | 226 | Ciuci, Matteo (1564) | Lost 0-2 | -161446 |
| 4standard | 382 | Marchesotti, Daniele (1479) | Draw 1-1 | 01446 |
| 5standard | 340 | Perfetti, Matteo (1522) | Won 2-0 | +201466 |
| 6standard | 209 | Brunner, Christopher (1644) | Lost 1-2 | -151451 |
| 7standard | 331 | Poroszkai, Laszlo (1604) | Lost 1-2 | -151436 |
| 8standard | 342 | Kamper, Robert (1445) | Lost 0-2 | -181418 |
| 9standard | 318 | Meyer, Patrick (1490) | Lost 1-2 | -171401 |
| top | average opponent: 1535record: 3-5-1 | new rating: 1401 | ||
| Grand Prix Krakow 2015 (DTK standard) | starting rating: 1472 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 254 | Sorum, Tore Johan (1437) | Lost 1-2 | -181454 |
| 4standard | 293 | Szymanski, Marek (1444) | Lost 0-2 | -181436 |
| 5standard | 319 | Szczotka, Kacper (1487) | Lost 0-2 | -171419 |
| 6standard | 406 | Grygierczyk, Mariusz (1480) | Lost 1-2 | -171402 |
| 7standard | 395 | Ofmanski, Michal (1445) | Won 2-0 | +181420 |
| 8standard | 320 | Kwiecien, Pawel (1454) | Won 2-0 | +191439 |
| 9standard | 250 | Steinbeiss, Alexander (1497) | Lost 0-2 | -171422 |
| top | average opponent: 1464record: 2-5 | new rating: 1422 | ||
| Grand Prix Prague 2014 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 292 | Lysek, Andrzej (1684) | Won 2-1 | +211521 |
| 3modern | 187 | Jahoda, Jakub (1731) | Lost 0-2 | -141507 |
| 4modern | 232 | Hribek, Michal (1607) | Lost 0-2 | -161491 |
| 5modern | 433 | Toepler, Ruben (1467) | Lost 1-2 | -191472 |
| top | average opponent: 1622record: 1-3 | new rating: 1472 | ||