Koszewski, Mateusz
Current rating: 1544
Record: 15-13-2
| Grand Prix Paris 2015 (DTK standard) | starting rating: 1561 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 70 | Vasseur, Emmanuel (1500) | Draw 1-1 | -11560 |
| 2standard | 301 | Adam, Christos (1442) | Won 2-0 | +151575 |
| 3standard | 337 | Beenen, Gregory (1518) | Draw 1-1 | -11574 |
| 4standard | 459 | Schwarz, Sascha (1876) | Lost 0-2 | -121562 |
| 5standard | 542 | Hebert, Christophe (1560) | Lost 1-2 | -181544 |
| top | average opponent: 1579record: 1-2-2 | new rating: 1544 | ||
| Grand Prix Krakow 2015 (DTK standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 78 | Mieczkowski, Jaroslaw (1459) | Lost 0-2 | -191481 |
| 2standard | 317 | Barrass, Sophie (1511) | Won 2-1 | +191500 |
| 3standard | 442 | Siwarski, Lukasz (1448) | Won 2-0 | +171517 |
| 4standard | 194 | Capinski, Rafal (1509) | Won 2-0 | +181535 |
| 5standard | 75 | Arushanyan, Arsen (1663) | Won 2-1 | +201555 |
| 6standard | 131 | Takagi, Piotr (1567) | Won 2-1 | +181573 |
| 7standard | 70 | Brozek, Jan (1752) | Lost 1-2 | -141559 |
| 8standard | 261 | Nabil, Mohamed (1581) | Lost 0-2 | -181541 |
| 9standard | 184 | Schetka, Evgeny (1627) | Won 2-0 | +201561 |
| top | average opponent: 1569record: 6-3 | new rating: 1561 | ||
| Grand Prix Stockholm 2014 (KTK standard) | starting rating: 1523 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 213 | Hallavo, Ville (1451) | Won 2-1 | +171540 |
| 2standard | 128 | Edstein, Robert (1518) | Won 2-1 | +181558 |
| 3standard | 27 | Bardh, Simon (1528) | Lost 0-2 | -191539 |
| 4standard | 170 | Basoni, Federico (1508) | Lost 1-2 | -191520 |
| 5standard | 295 | Azpillaga, Martin (1467) | Won 2-0 | +171537 |
| 6standard | 283 | Hedstrom, Arvid (1485) | Lost 0-2 | -191518 |
| 7standard | 289 | Hedin, Viktor (1505) | Lost 0-2 | -181500 |
| top | average opponent: 1495record: 3-4 | new rating: 1500 | ||
| Grand Prix Prague 2013 (M14 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 33 | Szenasi, Csaba (1695) | Lost 0-2 | -141486 |
| 2sealed | 501 | Rietzschel, Tobias (1482) | Won 2-0 | +171503 |
| 3sealed | 357 | Von Der Ohe, Timon (1500) | Lost 1-2 | -181485 |
| 4sealed | 532 | Blank, Oliver (1474) | Won 2-1 | +181503 |
| 5sealed | 541 | Kinzel, Martin (1498) | Lost 0-2 | -181485 |
| 6sealed | 541 | Fiala, Patrik (1481) | Won 2-0 | +181503 |
| 7sealed | 432 | Franke, Tim (1507) | Lost 0-2 | -181485 |
| 8sealed | 389 | Graba, Bartlomiej (1558) | Won 2-1 | +191504 |
| 9sealed | 281 | Sedivy, Jan (1550) | Won 2-1 | +191523 |
| top | average opponent: 1527record: 5-4 | new rating: 1523 | ||