Koebke, William
Current rating: 1526
Record: 10-9-1
| Grand Prix Madison 2015 (BFZ limited) | starting rating: 1505 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 184 | Johnson, Raymond (1500) | Lost 1-2 | -191486 |
| 2sealed | 421 | Do, Terrance (1482) | Won 2-0 | +181504 |
| 3sealed | 464 | Nerling, Brad (1500) | Won 2-0 | +181522 |
| 4sealed | 250 | Chodara, Kenton (1519) | Won 2-0 | +181540 |
| 5sealed | 154 | Beger, Justin (1538) | Won 2-0 | +181558 |
| 6sealed | 94 | Hobbs, Sean (1578) | Lost 1-2 | -171541 |
| 7sealed | 171 | Heilicher, Ethan (1750) | Lost 1-2 | -151526 |
| top | average opponent: 1552record: 4-3 | new rating: 1526 | ||
| Grand Prix Oklahoma City 2015 (modern) | starting rating: 1505 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 150 | Gregory, Jacob (1446) | Lost 0-2 | -191486 |
| 2modern | 531 | Wagstaff, Zac (1467) | Won 2-0 | +171503 |
| 3modern | 439 | Cowe, Patrick (1601) | Draw 0-0 | +21505 |
| 4modern | 402 | Bierig, Braden (1555) | Won 2-0 | +191524 |
| 5modern | 1036 | Jones, Derek (1444) | Lost 0-2 | -191505 |
| top | average opponent: 1503record: 2-2-1 | new rating: 1505 | ||
| Grand Prix Las Vegas 2015 (2) (MM2 limited) | starting rating: 1523 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 254 | Lin, Patricia (1500) | Lost 0-2 | -181505 |
| top | record: 0-1 | new rating: 1505 | ||
| Grand Prix New Jersey 2014 (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 58 | Wong, Simon (1500) | Lost 0-2 | -181482 |
| 2legacy | 530 | Russo, James (1481) | Won 2-0 | +181500 |
| 3legacy | 330 | Frado, Jean-Louis (1587) | Lost 1-2 | -161484 |
| 4legacy | 547 | Novins, Michael (1445) | Won 2-1 | +171501 |
| 5legacy | 446 | Alikaya, Zeki (1494) | Won 2-1 | +181519 |
| 6legacy | 369 | Morey, David (1521) | Won 2-1 | +181537 |
| 7legacy | 194 | O'Donnell, Devon (1781) | Lost 0-2 | -141523 |
| top | average opponent: 1544record: 4-3 | new rating: 1523 | ||