Kubo, Sachiko
Current rating: 1493
Record: 3-3
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 655 | Yajima, Yasunori (1401) | Lost 0-2 | -201480 |
| 2sealed | 862 | Tsuchiya, Yoshihiro (1311) | Lost 1-2 | -211459 |
| 3sealed | 1120 | Takahashi, Satoshi (1465) | Lost 0-2 | -181441 |
| 4sealed | 1137 | Ohshiba, Atsushi (1349) | Won 2-1 | +171458 |
| 5sealed | 999 | Ariga, Takayuki (1463) | Won 2-0 | +181476 |
| 6sealed | 800 | Yamaguchi, Hiroshi9054 (1466) | Won 2-0 | +171493 |
| average opponent: 1409record: 3-3 | new rating: 1493 | |||