Katayama, Kojiro
Current rating: 1404
Record: 3-8
| Grand Prix Nagoya 2019 (ELD standard) | starting rating: 1499 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 414 | Matsushima, Tsutomu (1328) | Lost 1-2 | -211478 |
| 2standard | 506 | Onishi, Akira (1505) | Lost 0-2 | -181460 |
| 3standard | 823 | Kuno, Michihiro (1463) | Lost 1-2 | -181442 |
| 4standard | 816 | Mukai, Koudai (1452) | Lost 1-2 | -181424 |
| 5standard | 786 | Iwata, Seiya (1310) | Lost 1-2 | -201404 |
| average opponent: 1411record: 0-5 | new rating: 1404 | |||
| Grand Prix Shizuoka 2018 (standard) (GRN standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 688 | Kubo, Yuya7609 (1500) | Won 2-0 | +181518 |
| 2standard | 491 | Yamaguchi, Takahiro (1429) | Won 2-0 | +161534 |
| 3standard | 382 | Kishi, Daiko (1431) | Lost 0-2 | -201514 |
| 4standard | 652 | Shirahata, Gen (1508) | Won 2-1 | +181532 |
| 5standard | 387 | Komatsubara, Fumiya (1543) | Lost 0-2 | -171515 |
| 6standard | 596 | Usui, Mitsuru (1635) | Lost 1-2 | -161499 |
| average opponent: 1507record: 3-3 | new rating: 1499 | |||