Kumagai, Shigeto
Current rating: 1461
Record: 6-8
| Grand Prix Yokohama 2012 (modern) | starting rating: 1519 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 63 | Nemoto, Daisuke (1500) | Lost 0-2 | -191500 |
| 3modern | 571 | Takeda, Harunobu (1505) | Lost 0-2 | -181482 |
| 4modern | 574 | Horie, Youhei (1483) | Won 2-0 | +181500 |
| 5modern | 444 | Mitsuhashi, Shou (1441) | Lost 1-2 | -191481 |
| 6modern | 469 | Yoshimura, Motoki (1339) | Lost 1-2 | -201461 |
| average opponent: 1454record: 1-4 | new rating: 1461 | |||
| Grand Prix Kobe 2012 (DKA limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 86 | Mochizuki, Yuusuke (1503) | Lost 0-2 | -181482 |
| 2sealed | 390 | Itou, Shin'ya (1481) | Won 2-1 | +181500 |
| 3sealed | 245 | Dobashi, Kyouta (1501) | Won 2-0 | +181518 |
| 4sealed | 192 | Muraoka, Yuki (1648) | Lost 0-2 | -161502 |
| 5sealed | 318 | Amino, Kaoru (1467) | Won 2-0 | +181520 |
| 6sealed | 248 | Mizuno, Nobuyoshi (1497) | Won 2-0 | +171537 |
| 7sealed | 146 | Omori, Tomoaki (1700) | Lost 1-2 | -151522 |
| 8sealed | 189 | Kondo, Hirotsugu (1447) | Won 2-0 | +171539 |
| 9sealed | 166 | Tsurifune, Takashi (1417) | Lost 1-2 | -201519 |
| average opponent: 1518record: 5-4 | new rating: 1519 | |||