Ronczka, Jacek
Current rating: 1563
Record: 24-20
| Grand Prix Krakow 2019 (M20 limited) | starting rating: 1567 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 449 | Babek, Oskar (1443) | Lost 0-2 | -211546 |
| 2sealed | 563 | Rembowski, Rafal (1413) | Won 2-0 | +161562 |
| 3sealed | 364 | Kosmalski, Dawid (1502) | Won 2-0 | +171579 |
| 4sealed | 156 | Bach, Wolfgang (1832) | Won 2-0 | +221601 |
| 5sealed | 152 | Mirkin, Kyrylo (1497) | Won 2-1 | +171618 |
| 6sealed | 119 | Bialek, Szymon (1595) | Lost 0-2 | -191599 |
| 7sealed | 223 | Ratilainen, Tomi (1666) | Lost 1-2 | -171582 |
| 8sealed | 352 | Hummel, Konstantin (1483) | Lost 1-2 | -191563 |
| top | average opponent: 1554record: 4-4 | new rating: 1563 | ||
| Grand Prix Warsaw 2016 (KLD standard) | starting rating: 1546 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 38 | Chmielewski, Damian (1500) | Won 2-0 | +171563 |
| 2standard | 179 | Szpac, Andrzej (1575) | Lost 1-2 | -181545 |
| 3standard | 394 | Przybylski, Michal (1499) | Won 2-1 | +171562 |
| 4standard | 325 | Volpi, Mattia (1676) | Won 2-0 | +211583 |
| 5standard | 234 | Lissowski, Mateusz (1561) | Lost 1-2 | -191564 |
| 6standard | 222 | Polkowski, Grzegorz (1530) | Lost 1-2 | -181546 |
| 7standard | 347 | Lee, Dongkyu (1574) | Lost 1-2 | -181528 |
| 8standard | 368 | Erenyi, Jakub (1700) | Won 2-0 | +211549 |
| 9standard | 298 | Jemiolek, Jakub (1522) | Won 2-0 | +181567 |
| top | average opponent: 1571record: 5-4 | new rating: 1567 | ||
| Grand Prix Krakow 2015 (DTK standard) | starting rating: 1537 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 26 | Bohuslav, Robert (1447) | Lost 0-2 | -201517 |
| 2standard | 361 | Lorenc, Krzysztof (1537) | Won 2-1 | +191536 |
| 3standard | 436 | Maks, Maciej (1500) | Lost 0-2 | -191517 |
| 4standard | 453 | Gorski, Bartlomiej (1481) | Won 2-1 | +171534 |
| 5standard | 412 | Ciach, Maciej (1567) | Lost 0-2 | -171517 |
| 6standard | 435 | Bucholc, Filip (1441) | Won 2-0 | +171534 |
| 7standard | 307 | Mikula, Andreas (1411) | Lost 1-2 | -211513 |
| 8standard | 319 | Piszcz, Tomasz (1474) | Won 2-1 | +181531 |
| 9standard | 254 | Demmel, Christian (1383) | Won 2-0 | +151546 |
| top | average opponent: 1471record: 5-4 | new rating: 1546 | ||
| Grand Prix Warsaw 2014 (JOU limited) | starting rating: 1526 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 253 | Serdtsev, Leonid (1474) | Won 2-0 | +171543 |
| 2sealed | 90 | Palaskevic, Nikita (1521) | Lost 1-2 | -191524 |
| 3sealed | 318 | Grefling, Jakub (1488) | Won 2-0 | +181542 |
| 4sealed | 144 | Chovanec, Jakub (1505) | Lost 1-2 | -191523 |
| 5sealed | 282 | Maciukiewicz, Marcin (1423) | Won 2-1 | +161539 |
| 6sealed | 5 | Karlsson, Markus (1543) | Lost 1-2 | -181521 |
| 7sealed | 299 | Ben-Yami, Jotham (1490) | Lost 0-0 | -181503 |
| 8sealed | 282 | Vermeiren, Yves (1372) | Won 2-0 | +151518 |
| 9sealed | 60 | Nowak, Przemyslaw (1557) | Won 2-0 | +191537 |
| top | average opponent: 1486record: 5-4 | new rating: 1537 | ||
| Grand Prix Warsaw 2013 (M14 standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 26 | Tent, Leander (1500) | Won 2-0 | +181518 |
| 2standard | 219 | Hodzic, Said (1667) | Lost 1-2 | -151503 |
| 3standard | 285 | Gybas, Jan (1447) | Lost 0-2 | -191484 |
| 4standard | 380 | Kobielski, Mateusz (1482) | Won 2-1 | +181502 |
| 5standard | 408 | Bocian, Lukasz (1436) | Won 2-1 | +161518 |
| 6standard | 335 | Mares, Jiri (1550) | Won 2-1 | +191537 |
| 7standard | 160 | Utter-Leyton, Josh (2001) | Won 2-1 | +261563 |
| 8standard | 88 | Vejdelek, Roman (1553) | Lost 0-2 | -181545 |
| 9standard | 135 | Picot, Pierre (1485) | Lost 1-2 | -191526 |
| top | average opponent: 1569record: 5-4 | new rating: 1526 | ||