Kumada, Keiichiro
Current rating: 1814 (#1884)
Record: 45-26
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1771 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 262 | Komori, Yuuya (1445) | Won 2-0 | +121783 |
| 3sealed | 448 | Sugimori, Daisuke (1571) | Won 2-1 | +151798 |
| 4sealed | 116 | Yamamoto, Ryoichi (1642) | Lost 1-2 | -211777 |
| 5sealed | 151 | Fujii, Kohei (1736) | Won 2-0 | +171794 |
| 6sealed | 318 | Tinen, Kousuke (1701) | Won 2-0 | +161810 |
| 7sealed | 109 | Kawashima, Masashi (1612) | Lost 0-2 | -211789 |
| 8sealed | 287 | Miyata, Kentaro (1554) | Won 2-1 | +141803 |
| 9sealed | 180 | Honda, Rintaro (1901) | Won 2-0 | +191822 |
| 10draft | 74 | Shiraki, Takahiro (1803) | Won 2-0 | +181840 |
| 11draft | 175 | Takakuwa, Akihiro (1694) | Won 2-1 | +151855 |
| 12draft | 199 | Kaneko, Masayuki3656 (1832) | Lost 1-2 | -181837 |
| 13draft | 12 | Omi, Tatsuya (1579) | Won 2-1 | +131850 |
| 14draft | 12 | Nakamura, Souta (1809) | Lost 0-2 | -181832 |
| 15draft | 12 | Nagai, Mamoru (1842) | Lost 0-2 | -181814 |
| top | average opponent: 1694record: 9-5 | new rating: 1814 | ||
| Grand Prix Yokohama 2019 (modern) | starting rating: 1609 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 659 | Nakano, Kengo (1463) | Won 2-1 | +151624 |
| 2modern | 596 | Okuda, Masateru (1549) | Won 2-0 | +171641 |
| 3modern | 461 | Huang, Han Shen (1587) | Won 2-1 | +171658 |
| 4modern | 32 | Kometani, Yuki (1676) | Won 2-0 | +181676 |
| 5modern | 112 | Nakada, Ryo (1755) | Won 2-1 | +191695 |
| 6modern | 15 | Ma, Noah (1832) | Won 2-0 | +211716 |
| 7modern | 9 | Takano, Kodai (1751) | Lost 0-2 | -181698 |
| 8modern | 74 | Tanaka, Yuuki (1539) | Won 2-0 | +161714 |
| 9modern | 38 | Kageyama, Hiroki (1731) | Won 2-0 | +181732 |
| 10modern | 30 | Boku, Takashi (1764) | Lost 0-2 | -171715 |
| 11modern | 37 | Kyogoku, Kyosuke (1718) | Won 2-0 | +181733 |
| 12modern | 27 | Kawakami, Yuuta (1597) | Won 2-1 | +151748 |
| 13modern | 12 | Kunisato, Ebie (1835) | Won 2-0 | +201768 |
| 14modern | 8 | Wada, Yuki (1958) | Lost 0-2 | -151753 |
| 15modern | 30 | Asaumi, Hiroki (1760) | Won 2-0 | +181771 |
| top | average opponent: 1701record: 12-3 | new rating: 1771 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1513 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 325 | Chiba, Toshiki (1500) | Won 2-1 | +181531 |
| 2sealed | 53 | Ichihara, Daisuke (1521) | Won 2-1 | +181549 |
| 3sealed | 407 | Hashizume, Yuuya (1554) | Won 2-0 | +181567 |
| 4sealed | 240 | Yuda, Yukihiro (1588) | Won 2-0 | +181585 |
| 5sealed | 48 | Kakimoto, Yuki (1496) | Won 2-0 | +171602 |
| 6sealed | 50 | Hasegawa, Kazunari (1834) | Lost 1-2 | -141588 |
| 7sealed | 41 | Kamiya, Kazuhiro (1518) | Won 2-0 | +161604 |
| 8sealed | 45 | Watanabe, Yuta 8061 (1559) | Lost 1-2 | -181586 |
| 9sealed | 98 | Obitsu, Youtarou (1752) | Lost 0-2 | -151571 |
| 10draft | 595 | Shimoyama, Masatoshi (1677) | Lost 1-2 | -161555 |
| 11draft | 594 | Agemura, Shota (1497) | Won 2-1 | +161571 |
| 12draft | 595 | Koide, Yukua (1565) | Lost 0-2 | -181553 |
| 13draft | 593 | Hashimoto, Satoshi 9278 (1540) | Won 2-0 | +181571 |
| 14draft | 587 | Nakamura, Yuya (1675) | Won 2-1 | +201591 |
| 15draft | 580 | Shibata, Yuuki (1567) | Won 2-1 | +181609 |
| top | average opponent: 1590record: 10-5 | new rating: 1609 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1536 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 96 | Nakajima, Hiroki (1335) | Won 2-1 | +151551 |
| 2standard | 617 | Bae, Sanghoon (1531) | Lost 0-1 | -191532 |
| 3standard | 1155 | Kokubun, Taiki (1501) | Lost 0-2 | -181514 |
| 4standard | 1375 | Mizukoshi, Hideyuki (1432) | Won 2-1 | +161530 |
| 5standard | 1011 | Ogasawara, Kan (1498) | Won 2-0 | +181548 |
| 6standard | 908 | Konndou, Hiromi (1517) | Won 2-0 | +171565 |
| 7standard | 452 | Perez, Ruben (1802) | Lost 1-2 | -141551 |
| 8standard | 795 | Maikhu, Suripat (1500) | Lost 0-2 | -191532 |
| 9standard | 725 | Umezawa, Hitoshi (1462) | Lost 0-2 | -191513 |
| top | average opponent: 1509record: 4-5 | new rating: 1513 | ||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1523 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 330 | Hanano, Tetsuaki (1500) | Won 2-0 | +181541 |
| 2sealed | 258 | Katsu, Masahiro (1315) | Won 2-0 | +131554 |
| 3sealed | 24 | Kotouge, Tatsuya (1668) | Lost 1-2 | -151539 |
| 4sealed | 159 | Ohara, Takashi (1543) | Lost 0-2 | -181521 |
| 5sealed | 375 | Kaneko, Masayuki (1535) | Won 2-0 | +181539 |
| 6sealed | 194 | Arai, Yuuya (1518) | Won 2-0 | +171556 |
| 7sealed | 109 | Kamei, Kazuhiko (1396) | Lost 0-2 | -201536 |
| 8sealed | 317 | Choi, Suouk (1541) | Won 2-1 | +181554 |
| 9sealed | 322 | Morita, Susumu (1585) | Lost 1-2 | -181536 |
| top | average opponent: 1511record: 5-4 | new rating: 1536 | ||
| Grand Prix Yokohama 2010 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 203 | Kinoshita, Tomohiro (1500) | Won 2-0 | +181518 |
| 2extended | 4 | Kawai, Yusuke (1568) | Won 2-0 | +191537 |
| 3extended | 71 | Mitsui, Hideo (1392) | Won 2-0 | +151552 |
| 4extended | 48 | Kiuchi, Satoru (1500) | Lost 1-2 | -191533 |
| 5extended | 69 | Kudo, Hiroshi (1485) | Won 2-0 | +171550 |
| 6extended | 78 | Nakano, Yoshitaka (1898) | Lost 1-2 | -111539 |
| 7extended | 115 | Yasuda, Masayuki (1611) | Lost 0-2 | -171522 |
| 8extended | 14 | Ueda, Katsuya (1652) | Won 2-1 | +201542 |
| 9extended | 122 | Umehara, Kei (1470) | Lost 1-2 | -191523 |
| top | average opponent: 1564record: 5-4 | new rating: 1523 | ||