Kumayabu, Katuhiro
Current rating: 1543
Record: 12-10
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1484 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 298 | Takechi, Takumi (1424) | Lost 0-2 | -191465 |
| 2sealed | 825 | Omuta, Shoya (1482) | Won 2-1 | +191484 |
| 3sealed | 893 | Katou, Yuusuke3333 (1460) | Lost 1-2 | -191465 |
| 4sealed | 1146 | Ookubo, Yoshirou (1480) | Won 2-1 | +191484 |
| 5sealed | 903 | Udagawa, Yuuya (1417) | Won 2-0 | +161500 |
| 6sealed | 460 | Pearse, Christian (1496) | Won 2-1 | +181518 |
| 7sealed | 380 | Terasawa, Yu (1559) | Won 2-0 | +191537 |
| 8sealed | 181 | Wang, Jung Kab (1494) | Won 2-0 | +171554 |
| 9sealed | 208 | Ikebata, Ryou (1675) | Lost 1-2 | -161538 |
| 10draft | 87 | Tay, Jun Hao (1790) | Lost 0-2 | -131525 |
| 11draft | 275 | Izaki, Yuji (1531) | Lost 1-2 | -181507 |
| 13draft | 205 | Ikeda, Takahiro (1555) | Won 2-1 | +191526 |
| 14draft | 193 | Koike, Yuta (1481) | Won 2-0 | +171543 |
| average opponent: 1526record: 8-5 | new rating: 1543 | |||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 95 | Takano, Hirokazu (1538) | Won 2-0 | +191519 |
| 2sealed | 245 | Kurata, Takayuki (1451) | Lost 0-2 | -201499 |
| 3sealed | 381 | Mizuno, Soichiro (1465) | Lost 0-2 | -181481 |
| 4sealed | 437 | Tsushima, Shinichirou (1493) | Won 2-1 | +181499 |
| 5sealed | 246 | Inamura, Sachio (1504) | Lost 1-2 | -181481 |
| 6sealed | 325 | Yoshida, Kazuhiro (1483) | Won 2-1 | +181499 |
| 7sealed | 254 | Yoshida, Akihiko (1569) | Lost 1-2 | -171482 |
| 8sealed | 227 | Tanaka, Keita (1502) | Won 2-1 | +191501 |
| 9sealed | 169 | Tsujikawa, Taiga (1594) | Lost 1-2 | -171484 |
| average opponent: 1511record: 4-5 | new rating: 1484 | |||