Kumagai, Shinichi
Current rating: 1622
Record: 44-30-4 (GP) / 2-4-1 (professional)
| Grand Prix Niigata 2005 (Kamigawa block) | starting rating: 1601 | |||
| round | table | opponent (rating) | result | Δrating |
| 2block | 91 | Suzuki, Ryuuichi (1455) | Won 2-1 | +151616 |
| 3block | 17 | Iizuka, Shun (1695) | Lost 1-2 | -161600 |
| 4block | 82 | Suzuki, Akiyoshi (1519) | Won 2-1 | +161616 |
| 5block | 57 | Honnami, Tomoyuki (1603) | Won 2-1 | +181634 |
| 6block | 62 | Oiso, Masashi (2161) | Lost 0-2 | -91625 |
| 7block | 86 | Yamashita, Hiroki (1536) | Lost 1-2 | -201605 |
| 8block | 85 | Yoshino, Eiichi (1557) | Won 2-1 | +171622 |
| top | average opponent: 1646record: 4-3 | new rating: 1622 | ||
| Grand Prix Yokohama 2004 (COK limited) | starting rating: 1624 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 20 | Igarashi, Daisuke (1500) | Draw 1-1 | -21622 |
| 2sealed | 193 | Aita, Shunji (1481) | Lost 1-2 | -211601 |
| top | average opponent: 1491record: 0-1-1 | new rating: 1601 | ||
| Grand Prix Nagoya 2004 (5DN standard) | starting rating: 1583 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 181 | Natsume, Seishiro (1491) | Won 2-1 | +161599 |
| 3standard | 66 | Kubota, Kenta (1656) | Lost 0-2 | -171582 |
| 4standard | 205 | Kanayama, Daisuke (1610) | Won 2-0 | +181600 |
| 5standard | 156 | Mitsuya, Kazuhiko (1829) | Lost 1-2 | -131587 |
| 6standard | 215 | Doi, Yuki (1519) | Won 2-1 | +161603 |
| 7standard | 143 | Fujita, Tsuyoshi (1843) | Won 2-0 | +231626 |
| 8standard | 97 | Mouri, Tomonori (1593) | Won 2-0 | +171643 |
| 9standard | 32 | Sakashita, Yoshiyuki (1581) | Lost 0-2 | -191624 |
| top | average opponent: 1640record: 5-3 | new rating: 1624 | ||
| Grand Prix Shizuoka 2003 (MRD limited) | starting rating: 1650 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 173 | Kataoka, Asami (1652) | Lost 1-2 | -181632 |
| 3sealed | 213 | Chijimi, Keiichi (1595) | Lost 1-2 | -191613 |
| 4sealed | 235 | Tsuchiya, Yasuhide (1435) | Lost 0-2 | -211592 |
| 5sealed | 231 | Watanabe, Masami (1466) | Won 2-0 | +151607 |
| 6sealed | 167 | Yamashita, Hiroki (1449) | Lost 0-2 | -201587 |
| 7sealed | 155 | Saito, Tomoya (1443) | Won 2-1 | +151602 |
| 8sealed | 117 | Nakamura, Kiyonari (1526) | Lost 0-2 | -191583 |
| top | average opponent: 1509record: 2-5 | new rating: 1583 | ||
| Grand Prix Yokohama 2003 (Onslaught block) | starting rating: 1685 | |||
| round | table | opponent (rating) | result | Δrating |
| 2block | 51 | Kim, Sung-Mook (1462) | Won 2-1 | +141699 |
| 3block | 34 | Miyamori, Masaei (1539) | Won 2-1 | +151714 |
| 4block | 62 | Kobayashi, Kota (1553) | Won 2-1 | +151729 |
| 5block | 31 | Takano, Yasuhiro (1580) | Lost 1-2 | -201709 |
| 6block | 87 | Oohira, Kenta (1522) | Won 2-1 | +141723 |
| 7block | 46 | Sutou, Takuo (1536) | Won 2-1 | +151738 |
| 8block | 15 | Ohara, Yoshirou (1594) | Lost 1-2 | -211717 |
| 9block | 50 | Kozakai, Yukio (1595) | Lost 1-2 | -201697 |
| 10block | 77 | Konagai, Ryota (1554) | Won 2-1 | +151712 |
| 11block | 37 | Mutou, Kouhei (1550) | Lost 1-2 | -211691 |
| 12block | 60 | Fujioka, Kazuki (1499) | Lost 0-2 | -211670 |
| 13block | 88 | Miyajima, Yoshitaka (1535) | Lost 1-2 | -201650 |
| top | average opponent: 1543record: 6-6 | new rating: 1650 | ||
| Grand Prix Kyoto 2003 (LGN limited) | starting rating: 1646 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 31 | Omori, Ken'ichirou (1466) | Draw 1-1 | -31643 |
| 3sealed | 106 | Le Goff, Loys (1483) | Draw 1-1 | -31640 |
| 4sealed | 186 | Kuroda, Toshiyuki (1618) | Lost 0-2 | -191621 |
| 5sealed | 215 | Shigehara, Toshinori (1501) | Won 2-0 | +161637 |
| 6sealed | 159 | Kasuga, Shohei (1519) | Won 2-1 | +161653 |
| 7sealed | 116 | Iwade, Takashi (1566) | Won 2-1 | +161669 |
| 8sealed | 50 | Yamada, Hiroki (1543) | Won 2-0 | +161685 |
| top | average opponent: 1528record: 4-1-2 | new rating: 1685 | ||
| Grand Prix Hiroshima 2003 (extended) | starting rating: 1701 | |||
| round | table | opponent (rating) | result | Δrating |
| 4extended | 41 | Okamoto, Jin (1900) | Lost 0-2 | -151686 |
| 5extended | 68 | Nishimura, Norihito (1536) | Lost 1-2 | -201666 |
| 6extended | 90 | Yamada, Tsutomu (1567) | Lost 0-2 | -201646 |
| top | average opponent: 1668record: 0-3 | new rating: 1646 | ||
| Pro Tour Houston 2002 (extended) | starting rating: 1733 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 37 | Oomens, Wessel (1634) | Lost 0-2 | -191714 |
| 2extended | 172 | Remie, Jeroen (1976) | Draw 1-1 | +41718 |
| 3extended | 130 | Mandel, Danny (1724) | Lost 1-2 | -181700 |
| 4extended | 155 | Herzog, Nicolai (1768) | Won 2-1 | +201720 |
| 5extended | 121 | Okamoto, Jin (1882) | Lost 0-2 | -161704 |
| 6extended | 117 | Chai, Royce Ming Huang (1770) | Lost 0-2 | -161688 |
| 7extended | 106 | Gattolin, Stefano (1410) | Won 2-1 | +131701 |
| top | average opponent: 1738record: 2-4-1 | new rating: 1701 | ||
| Grand Prix Utsunomiya 2002 (ONS rochester) | starting rating: 1769 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 154 | Fukai, Koichi (1500) | Lost 1-2 | -231746 |
| 2sealed | 218 | Karube, Ryo (1517) | Lost 1-2 | -221724 |
| 3sealed | 295 | Kobayashi, Masafumi (1464) | Won 2-0 | +141738 |
| 4sealed | 259 | Katsuta, Souichi (1482) | Won 2-0 | +131751 |
| 5sealed | 137 | Suzuki, Sadao (1500) | Won 2-0 | +141765 |
| 6sealed | 148 | Yamada, Hiroki (1496) | Lost 1-2 | -231742 |
| 7sealed | 123 | Gorny, Danny (1466) | Lost 0-2 | -231719 |
| 8sealed | 78 | Kammerzelt, Shawn (1521) | Won 2-1 | +141733 |
| top | average opponent: 1493record: 4-4 | new rating: 1733 | ||
| Grand Prix Sapporo 2002 (Odyssey block) | starting rating: 1537 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 92 | Mihara, Takumi (1463) | Won 2-0 | +171554 |
| 2block | 69 | Mizui, Shota (1439) | Lost 1-2 | -201534 |
| 3block | 124 | Kawaguchi, Masashi (1500) | Won 2-1 | +171551 |
| 4block | 76 | Ono, Ippei (1515) | Won 2-0 | +181569 |
| 5block | 30 | Kato, Atsushi (1536) | Won 2-0 | +171586 |
| 6block | 28 | Imai, Kimio (1493) | Draw 1-1 | -21584 |
| 7block | 37 | Yasufuku, Akihiro (1548) | Won 2-1 | +181602 |
| 8block | 77 | Okamoto, Jin (1903) | Won 2-0 | +231625 |
| 9block | 16 | Shibata, Yuuki (1575) | Won 2-1 | +171642 |
| 10block | 3 | Mayaguchi, Masaru (1594) | Won 2-0 | +171659 |
| 11block | 16 | Takasaki, Yuichi (1613) | Won 2-0 | +171676 |
| 12block | 9 | Minami, Masashi (1700) | Won 2-1 | +191695 |
| 13block | 11 | Kinoshita, Junichi (1733) | Won 2-0 | +181713 |
| 14block | 19 | Nakamura, Satoshi (1753) | ID | 01713 |
| Qblock | Hirosawa, Yuuta (1669) | Won 2-1 | +181731 | |
| Sblock | Nakamura, Satoshi (1769) | Won 2-1 | +181749 | |
| Fblock | Morita, Masahiko (1852) | Won 2-1 | +201769 | |
| top | average opponent: 1627record: 14-1-2 | new rating: 1769 | ||
| Grand Prix Sendai 2001 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 25 | Kiso, Keisuke (1500) | Won 2-1 | +181518 |
| 2extended | 77 | Akita, Naoto (1537) | Lost 1-2 | -181500 |
| 3extended | 121 | Chino, Masakazu (1500) | Won 2-0 | +181518 |
| 4extended | 66 | Nakamura, Satoshi (1592) | Lost 0-2 | -161502 |
| 5extended | 135 | Kitano, Tetsuya (1497) | Won 2-0 | +181520 |
| 6extended | 114 | Shudo, Masanori (1519) | Won 2-1 | +181538 |
| 7extended | 68 | Suzuki, Takayuki (1536) | Won 2-0 | +181556 |
| 8extended | 39 | Sugiki, Takafumi (1538) | Lost 0-2 | -191537 |
| top | average opponent: 1528record: 5-3 | new rating: 1537 | ||