Miyakoshi, Soichi
Current rating: 1448
Record: 5-8
| Grand Prix Chiba 2016 (legacy) | starting rating: 1524 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 548 | Kaneko, Masayuki4374 (1500) | Lost 0-2 | -191505 |
| 2legacy | 676 | Watanabe, Kazutaka (1465) | Lost 0-2 | -181487 |
| 3legacy | 1064 | Sakata, Atsushi (1463) | Lost 1-2 | -191468 |
| 4legacy | 1118 | Goto, Kosuke (1451) | Lost 0-2 | -181450 |
| 5legacy | 1139 | Endo, Takatomo (1357) | Won 2-0 | +161466 |
| 6legacy | 1041 | Watanabe, Ryouta3802 (1445) | Lost 0-2 | -181448 |
| average opponent: 1447record: 1-5 | new rating: 1448 | |||
| Grand Prix Yokohama 2012 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 389 | Sato, Kazuhito (1500) | Won 2-1 | +181518 |
| 2modern | 355 | Suda, Makoto (1504) | Won 2-0 | +181536 |
| 3modern | 106 | Date, Norikuni (1613) | Lost 1-2 | -171519 |
| 4modern | 289 | Endo, Jun'Ichi (1640) | Won 2-1 | +201539 |
| 5modern | 221 | Endo, Ryota (1865) | Lost 0-2 | -121527 |
| 6modern | 272 | Ueda, Daisuke (1453) | Lost 1-2 | -191508 |
| 7modern | 382 | Ito, Akira (1398) | Won 2-1 | +161524 |
| average opponent: 1568record: 4-3 | new rating: 1524 | |||