Koshiba, Toshiaki
Current rating: 1445
Record: 2-5
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 169 | Masuda, Hiroki (1504) | Lost 0-2 | -181482 |
| 2sealed | 617 | Sezume, Akihiro (1479) | Lost 1-2 | -181464 |
| 3sealed | 1105 | Nonaka, Shouhei (1388) | Lost 0-2 | -191445 |
| 4sealed | 1118 | Takahashi, Kazuhiro (1477) | Won 2-1 | +181463 |
| 5sealed | 950 | Shiina, Daisuke (1450) | Won 2-0 | +181481 |
| 6sealed | 873 | Murata, Tomoaki (1511) | Lost 1-2 | -171464 |
| 7sealed | 836 | Asai, Tetsuya (1427) | Lost 0-2 | -191445 |
| average opponent: 1462record: 2-5 | new rating: 1445 | |||