Seidmann, Jonah
Current rating: 1490
Record: 5-6
| Grand Prix London 2016 (KLD limited) | starting rating: 1487 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 484 | Harris, Jonathan (1500) | Won 2-0 | +191506 |
| 2sealed | 84 | Miras, Sergio (1641) | Won 2-0 | +201526 |
| 3sealed | 29 | Krieger, Philipp (1491) | Won 2-0 | +171543 |
| 4sealed | 131 | Baalham, Michael (1598) | Lost 0-2 | -171526 |
| 5sealed | 439 | Thomas, Robin (1541) | Lost 1-2 | -171509 |
| 6sealed | 647 | Chiesa, Richard (1456) | Lost 0-2 | -191490 |
| average opponent: 1538record: 3-3 | new rating: 1490 | |||
| Grand Prix London 2015 (ORI standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 495 | Gillespie, Adam D (1500) | Lost 0-2 | -181482 |
| 2standard | 855 | Nilsson, Rasmus (1803) | Lost 0-2 | -121470 |
| 3standard | 1064 | Bolton, Andrew (1464) | Lost 1-2 | -181452 |
| 4standard | 1069 | Hill, Josh (1446) | Won 2-0 | +171469 |
| 5standard | 1010 | Pitcher, Ian A (1464) | Won 2-0 | +181487 |
| average opponent: 1535record: 2-3 | new rating: 1487 | |||