Oosumi, Kei
Current rating: 1408
| Grand Prix Kyoto 2019 (RNA standard) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 435 | Hangyo, Tatsuya (1566) | Draw 1-1 | +21448 |
| 2standard | 504 | Ito, Ryo (1343) | Lost 1-2 | -201428 |
| 3standard | 869 | Sonoda, Kenichi (1300) | Lost 1-2 | -201408 |
| top | average opponent: 1403record: 0-2-1 | new rating: 1408 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1484 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 154 | Kobayashi, Toshio (1442) | Draw 1-1 | -11483 |
| 2modern | 631 | Taniguchi, Yuki (1458) | Lost 1-2 | -181465 |
| 3modern | 1169 | Kondou, Shin (1497) | Lost 0-2 | -181447 |
| 4modern | 1250 | Akimoto, Daichi (1477) | Lost 1-2 | -171430 |
| 5modern | 1263 | Tkg, Tkg (1443) | Won 2-1 | +181448 |
| 6modern | 1147 | Katayama, Yoshimi (1450) | Won 2-0 | +181466 |
| 7modern | 971 | Ikeda, Takeaki (1335) | Lost 1-2 | -201446 |
| 8modern | 909 | Wu, Chen Yen (1466) | Won 2-0 | +181464 |
| 9modern | 751 | Shiraishi, Ryuji (1452) | Lost 1-2 | -181446 |
| top | average opponent: 1447record: 3-5-1 | new rating: 1446 | ||
| Grand Prix Kobe 2014 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 393 | Endou, Hideaki (1500) | Lost 1-2 | -181482 |
| 2modern | 400 | Makino, Yuuichi (1583) | Lost 1-2 | -161466 |
| 3modern | 479 | Kakuta, Yoshitaka (1466) | Won 2-0 | +181484 |
| 4modern | 439 | Fujiwara, Hiroshi (1482) | Draw 1-1 | 01484 |
| top | average opponent: 1508record: 1-2-1 | new rating: 1484 | ||