Okada, Koichi
Current rating: 1409
Record: 0-5
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 530 | Takenaka, Shunsuke (1398) | Lost 1-2 | -201462 |
| 2sealed | 828 | Tamura, Shunpei (1472) | Lost 1-2 | -181444 |
| 3sealed | 1047 | Watanabe, Takeshi (1445) | Lost 1-2 | -181426 |
| 4sealed | 1115 | Aizawa, Tamotsu (1444) | Lost 0-2 | -171409 |
| average opponent: 1440record: 0-4 | new rating: 1409 | |||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 420 | Yoshida, Keitaro (1480) | Lost 0-2 | -181482 |
| record: 0-1 | new rating: 1482 | |||