Kumagai, Hiroaki
Current rating: 1506
Record: 10-11-3
| Grand Prix Kobe 2012 (DKA limited) | starting rating: 1489 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 140 | Kenji W., (1500) | Lost 0-2 | -181471 |
| 2sealed | 434 | Iwamizu, Kendou (1482) | Won 2-1 | +181489 |
| 3sealed | 418 | Kiyokawa, Hidetoshi (1470) | Won 2-1 | +181507 |
| 4sealed | 223 | Kubouchi, Hayato (1495) | Draw 1-1 | -11506 |
| 5sealed | 248 | Katou, Daisuke (1485) | Won 2-0 | +181524 |
| 6sealed | 164 | Tanaka, Akira (1524) | Lost 1-2 | -181506 |
| top | average opponent: 1493record: 3-2-1 | new rating: 1506 | ||
| Grand Prix Kobe 2008 (Lorwyn block) | starting rating: 1434 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 148 | Murakami, Yuuki (1684) | Won 2-1 | +221456 |
| 2block | 26 | Ito, Shinichi (1546) | Lost 0-2 | -161440 |
| 3block | 222 | Tanaka, Ryouhei (1501) | Won 2-1 | +191459 |
| 4block | 212 | Nishiwaki, Akito (1557) | Lost 0-2 | -161443 |
| 5block | 262 | Yamashita, Kouhei (1534) | Won 2-1 | +191462 |
| 6block | 212 | hanada, masato (1518) | Won 2-0 | +191481 |
| 7block | 148 | Takagi, Takeshi (1712) | Won 2-0 | +231504 |
| 8block | 110 | Nakamura, Yuichiro (1668) | Lost 1-2 | -151489 |
| top | average opponent: 1590record: 5-3 | new rating: 1489 | ||
| Grand Prix Shizuoka 2001 (ODY limited) | starting rating: 1431 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 18 | Tsushima, Yusuke (1498) | Won 2-1 | +191450 |
| 2sealed | 16 | Nadachi, Shinji (1500) | Draw 1-1 | +11451 |
| 3sealed | 114 | Yasufuku, Akihiro (1500) | Lost 0-2 | -171434 |
| top | average opponent: 1499record: 1-1-1 | new rating: 1434 | ||
| Grand Prix Kobe 2001 (Invasion block) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 256 | Nemoto, Takashi (1538) | Lost 1-2 | -171466 |
| 2block | 407 | Tamaki, Kensuke (1482) | Lost 0-2 | -171449 |
| 3block | 626 | Yoshioka, Tetsuya (1464) | Lost 0-2 | -181431 |
| top | average opponent: 1495record: 0-3 | new rating: 1431 | ||
| Grand Prix Hiroshima 2001 (INV limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 77 | Nakamura, Fumihiko (1500) | Lost 0-2 | -181482 |
| 2sealed | 150 | Sugita, Toshihiko (1480) | Lost 1-2 | -181464 |
| 3sealed | 176 | Inami, Kazuyuki (1464) | Won 2-0 | +181482 |
| 4sealed | 178 | Yamasaki, Yudai (1551) | Draw 1-1 | +11483 |
| top | average opponent: 1499record: 1-2-1 | new rating: 1483 | ||