Korff, Johannes
Current rating: 1536
Record: 13-13-3
| Grand Prix Prague 2017 (AER limited) | starting rating: 1522 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 493 | Zabsky, Matej (1500) | Won 2-1 | +181540 |
| 2sealed | 209 | Semenov, Petr (1772) | Won 2-1 | +221562 |
| 3sealed | 402 | Casamenti, Alessandro (1864) | Lost 1-2 | -131549 |
| 4sealed | 527 | Staniucha, Tymoteusz (1771) | Won 2-1 | +221571 |
| 5sealed | 398 | Nacsa, Zsofia (1543) | Lost 0-2 | -181553 |
| 6sealed | 571 | Galensa, Maximilian (1641) | Lost 0-2 | -161537 |
| 7sealed | 641 | Kalmar, Robert (1507) | Draw 1-1 | -11536 |
| top | average opponent: 1657record: 3-3-1 | new rating: 1536 | ||
| Grand Prix Barcelona 2016 (SOI limited) | starting rating: 1536 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 417 | Grossl Melean, Joshua (1522) | Won 1-0 | +181554 |
| 2sealed | 351 | Costa, Nuno (1822) | Lost 0-2 | -131541 |
| 3sealed | 807 | Laznovsky, Martin (1720) | Won 2-0 | +211562 |
| 4sealed | 613 | Dominiak, Krzysztof (1493) | Lost 0-2 | -191543 |
| 5sealed | 695 | Van Leeuwen, Vincent (1493) | Lost 0-2 | -191524 |
| 6sealed | 798 | Horcajo, Adrian (1474) | Won 2-1 | +171541 |
| 7sealed | 561 | Zobel, Sebastian (1506) | Lost 0-2 | -191522 |
| top | average opponent: 1576record: 3-4 | new rating: 1522 | ||
| Grand Prix Utrecht 2015 (MM2 limited) | starting rating: 1579 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 2237 | Hartjes, Jacques (1500) | Lost 0-2 | -201559 |
| 2sealed | 2378 | Varennes, Elodie (1376) | Won 2-0 | +151574 |
| 3sealed | 2244 | van der Steenhoven, Rob (1624) | Lost 1-2 | -171557 |
| 4sealed | 2307 | Koers, Kenta (1410) | Lost 1-2 | -211536 |
| top | average opponent: 1477record: 1-3 | new rating: 1536 | ||
| Grand Prix Lisbon 2012 (RTR limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 517 | Marques, Eurico (1557) | Draw 1-1 | +11501 |
| 5sealed | 549 | Batista, Luis (1617) | Won 1-0 | +201521 |
| 6sealed | 523 | Battiscombe, Peter (1542) | Draw 1-1 | +11522 |
| 7sealed | 562 | Dagen, Pierre (2003) | Won 2-0 | +261548 |
| 8sealed | 536 | Del Moral Leon, Antonio (1569) | Won 2-0 | +181566 |
| 9sealed | 641 | Maia, Jose Maria (1600) | ID | 01566 |
| 10draft | 55 | Martinez, Alexis (1823) | Lost 0-2 | -131553 |
| 11draft | 2 | Ramalho, Bruno Miguel (1536) | Won 2-0 | +171570 |
| 12draft | 61 | Boelens, Jasper (1679) | Lost 1-2 | -161554 |
| 13draft | 25 | Pinto-Bello, Andres (1633) | Lost 0-2 | -161538 |
| 14draft | 38 | Dipsar, Sureyya (1823) | Won 2-0 | +231561 |
| 15draft | 60 | Pinto, Tiago (1566) | Won 2-0 | +181579 |
| top | average opponent: 1662record: 6-3-3 | new rating: 1579 | ||