Kozak, Jakub
Current rating: 1422
Record: 9-17
| Grand Prix Brussels 2020 (pioneer) | starting rating: 1384 | |||
| round | table | opponent (rating) | result | Δrating |
| 2pioneer | 216 | Chierzi, Fabrizio (1334) | Won 2-1 | +171401 |
| 3pioneer | 341 | Melis, Alessandro (1587) | Lost 1-2 | -151386 |
| 4pioneer | 399 | Lin, C. Y. (1468) | Won 2-0 | +201406 |
| 5pioneer | 129 | Hoogstraten, Mark (1727) | Won 2-0 | +231429 |
| 6pioneer | 65 | Nguyen, Thien (1838) | Lost 0-2 | -111418 |
| 7pioneer | 229 | Sucquet, Alexander (1505) | Won 2-1 | +201438 |
| 8pioneer | 109 | Garcia Lerta, Juan Luis (1532) | Lost 0-2 | -161422 |
| top | average opponent: 1570record: 4-3 | new rating: 1422 | ||
| Grand Prix Warsaw 2018 (GRN limited) | starting rating: 1401 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 311 | Riedel, Andreas (1399) | Lost 0-2 | -181383 |
| 3sealed | 687 | Sarosiek, Szymon (1486) | Won 2-1 | +201403 |
| 4sealed | 599 | McGovern, Mark (1641) | Won 2-1 | +221425 |
| 5sealed | 257 | Ehrhardt, Andreas (1742) | Lost 0-2 | -121413 |
| 6sealed | 354 | Bergonzoni, Luca (1735) | Lost 1-2 | -131400 |
| 7sealed | 426 | Almela Torres, Amadeo (1476) | Lost 1-2 | -161384 |
| top | average opponent: 1580record: 2-4 | new rating: 1384 | ||
| Grand Prix Prague 2018 (modern) | starting rating: 1424 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 251 | Steiner, Luca (1518) | Lost 0-2 | -171407 |
| 3modern | 767 | Rentsch, Jari (1825) | Won 2-1 | +261433 |
| 4modern | 543 | Siddik, Ahmed (1512) | Lost 0-2 | -171416 |
| 5modern | 502 | Maier, Jordan (1581) | Lost 1-2 | -151401 |
| top | average opponent: 1609record: 1-3 | new rating: 1401 | ||
| Grand Prix Bologna 2016 (modern) | starting rating: 1474 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 257 | Ferreri, Paolo (1450) | Won 2-1 | +171491 |
| 4modern | 60 | Masini, Alberto (1623) | Lost 0-2 | -151476 |
| 5modern | 474 | Lin, Alessio (1469) | Lost 0-2 | -181458 |
| 6modern | 575 | Hlavac, Miroslav (1532) | Lost 0-2 | -171441 |
| 7modern | 552 | Buchinger, Peter (1476) | Lost 0-2 | -171424 |
| top | average opponent: 1510record: 1-4 | new rating: 1424 | ||
| Grand Prix Krakow 2015 (DTK standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 90 | Wiktorzak, Piotr (1643) | Won 2-1 | +211521 |
| 4standard | 98 | Bruski, Bartosz (1609) | Lost 0-2 | -171504 |
| 5standard | 144 | Chovanec, Jakub (1482) | Lost 0-2 | -181486 |
| 6standard | 244 | Portaro, Alessandro (1834) | Lost 0-2 | -121474 |
| top | average opponent: 1642record: 1-3 | new rating: 1474 | ||