Koike, Masaya
Current rating: 1564
Record: 8-5
| Grand Prix Yokohama 2019 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 580 | Oda, Kouichi (1530) | Lost 0-2 | -171483 |
| 2modern | 670 | Kuroyanagi, Hirohito (1309) | Won 2-1 | +141497 |
| 3modern | 560 | Murata, Shunya (1471) | Won 2-0 | +181515 |
| 4modern | 574 | Matsuyama, Ryousuke (1725) | Won 2-1 | +221537 |
| 5modern | 218 | Chen, Xinrong (1718) | Won 2-1 | +211558 |
| 6modern | 275 | Fukunaga, Keisuke (1657) | Won 2-0 | +201578 |
| 7modern | 193 | Minoura, Takeshi (1535) | Won 2-1 | +171595 |
| 8modern | 82 | Miyake, Kyohei (1837) | Won 2-1 | +221617 |
| 9modern | 46 | Maki, Hidekazu (1753) | Lost 0-2 | -151602 |
| 10modern | 68 | Yamano, Tatsuto (1375) | Won 2-0 | +141616 |
| 11modern | 92 | Mishina, Ryota (1631) | Lost 0-2 | -181598 |
| 12modern | 92 | Mizuno, Yusuke (1707) | Lost 1-2 | -161582 |
| 13modern | 149 | Shen, Yufei (1602) | Lost 1-2 | -181564 |
| average opponent: 1604record: 8-5 | new rating: 1564 | |||