Kokubun, Hiroshi
Current rating: 1658
Record: 41-25-1
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1689 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 205 | Kowata, Kyohei (1500) | Lost 1-2 | -221667 |
| 2sealed | 879 | Nagano, Keita (1739) | Won 2-0 | +201687 |
| 3sealed | 562 | Hashimoto, Satoshi 9278 (1507) | Lost 1-2 | -221665 |
| 4sealed | 1072 | Hasegawa, Kazuhiko3707 (1495) | Lost 0-2 | -211644 |
| 5sealed | 941 | Hidaka, Takuya (1419) | Won 2-0 | +141658 |
| top | average opponent: 1532record: 2-3 | new rating: 1658 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1701 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 219 | Itou, Kenta (1534) | Lost 0-2 | -211680 |
| 2standard | 738 | Tamamura, Hideya (1483) | Won 2-0 | +151695 |
| 3standard | 1116 | Nakajima, Hitoshi (1502) | Won 2-1 | +141709 |
| 4standard | 590 | Hattori, Takesi (1459) | Lost 0-2 | -221687 |
| 5standard | 651 | Masahiro, Sotozaki (1488) | Won 2-0 | +141701 |
| 6standard | 796 | Kubo, Yuta (1529) | Won 2-0 | +151716 |
| 7standard | 304 | Kikuchi, Masaki (1541) | Won 2-0 | +151731 |
| 8standard | 188 | Asakura, Takumi (1456) | Lost 1-2 | -231708 |
| 9standard | 451 | Hibino, Yasutaka (1630) | Lost 1-2 | -191689 |
| top | average opponent: 1514record: 5-4 | new rating: 1689 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1743 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 855 | Komiyama, Kouhei (1525) | Lost 1-2 | -221721 |
| 2standard | 1108 | Nomura, Hiroshi (1449) | Won 2-1 | +131734 |
| 3standard | 929 | Hikino, Masaharu (1499) | Won 2-0 | +141748 |
| 4standard | 587 | Mizoguchi, Yuya (1455) | Lost 0-2 | -231725 |
| 5standard | 1059 | Arai, Kazuki (1420) | Lost 1-2 | -241701 |
| top | average opponent: 1470record: 2-3 | new rating: 1701 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1700 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 89 | Shibata, Takeshi (1500) | Won 2-0 | +141714 |
| 2sealed | 330 | Harada, Daisaku (1548) | Lost 1-2 | -211693 |
| 3sealed | 759 | Matsumoto, Masaya (1448) | Won 2-0 | +141707 |
| 4sealed | 655 | Yamanouchi, Takanori (1469) | Won 2-1 | +141721 |
| 5sealed | 525 | Satou, Tsubasa (1677) | Won 2-1 | +171738 |
| 6sealed | 311 | Taniguchi, Hiroaki (1702) | Lost 0-2 | -191719 |
| 7sealed | 445 | Ishii, Taiyo (1551) | Won 2-0 | +151734 |
| 8sealed | 347 | Iwamoto, Yuuki (1526) | Won 2-1 | +141748 |
| 9sealed | 134 | Sano, Keisuke (1471) | Lost 1-2 | -221726 |
| 10draft | 256 | Taniguchi, Hironobu (1547) | Won 2-1 | +141740 |
| 11draft | 166 | Samejima, Ippei (1570) | Lost 1-2 | -211719 |
| 12draft | 348 | Watanabe, Kouhei (1513) | Won 2-1 | +151734 |
| 13draft | 138 | Ohata, Hiroyuki (1568) | Lost 0-2 | -211713 |
| 14draft | 119 | Masuda, Jyunya (1576) | Won 2-1 | +151728 |
| 15draft | 99 | Iwasaki, Mitsumasa (1549) | Won 2-0 | +151743 |
| top | average opponent: 1548record: 10-5 | new rating: 1743 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1666 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 396 | Yamagishi, Kenta (1507) | Won 2-1 | +161682 |
| 2sealed | 291 | Minagawa, Takashi (1518) | Won 2-0 | +151697 |
| 3sealed | 52 | Inuzuka, Satoshi (1683) | Won 2-0 | +171714 |
| 4sealed | 94 | Machida, Takatoshi (1612) | Won 2-0 | +171731 |
| 5sealed | 51 | Fukuoka, Sou (1551) | Lost 1-2 | -221709 |
| 6sealed | 124 | Ueda, Tadahiko (1384) | Won 2-1 | +131722 |
| 7sealed | 66 | Taira, Shunichi (1699) | Won 2-1 | +171739 |
| 8sealed | 14 | Park, Bi-O (1710) | Lost 0-2 | -181721 |
| 9sealed | 78 | Ishida, Shinpei (1573) | Lost 0-2 | -211700 |
| top | average opponent: 1582record: 6-3 | new rating: 1700 | ||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1605 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 908 | Hasegawa, Kazunari (1554) | Draw 1-1 | -11604 |
| 2sealed | 860 | Nakao, Takumi (1500) | Won 2-1 | +161620 |
| 3sealed | 832 | Mizuno, Yuya (1517) | Won 2-0 | +171637 |
| 4sealed | 719 | Liang, Chihwei (1542) | Won 2-0 | +161653 |
| 5sealed | 657 | Oh, Joo Hyun (1645) | Won 2-1 | +181671 |
| 6sealed | 632 | Matubayashi, Kazunori (1569) | Lost 1-2 | -201651 |
| 7sealed | 691 | Komatsu, Isamu (1552) | Won 2-0 | +161667 |
| 8sealed | 650 | Nagai, Mamoru (1755) | Lost 1-2 | -161651 |
| 9sealed | 701 | Itani, Shintaro (1532) | Won 2-1 | +151666 |
| top | average opponent: 1574record: 6-2-1 | new rating: 1666 | ||
| Grand Prix Nagoya 2014 (BNG limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 235 | Ogura, Ryou (1829) | Won 2-1 | +241524 |
| 2sealed | 83 | Satou, Yuji (1518) | Won 2-0 | +181542 |
| 3sealed | 37 | Koyanagi, Takashi (1595) | Lost 0-2 | -171525 |
| 4sealed | 236 | Hoshi, Koutarou (1487) | Won 2-1 | +171542 |
| 5sealed | 87 | Suzuki, Atsushi (1537) | Won 2-0 | +181560 |
| 6sealed | 33 | Wada, Hiroya (1659) | Lost 1-2 | -161544 |
| 7sealed | 94 | Kamata, Kazuhiro (1544) | Won 2-0 | +181562 |
| 8sealed | 125 | Hashimoto, Masatoshi (1597) | Won 2-0 | +181580 |
| 9sealed | 76 | Takeuchi, Akinari (1635) | Won 2-0 | +191599 |
| 10draft | 64 | Wakayama, Shiro (1620) | Won 2-1 | +191618 |
| 11draft | 74 | Park, Bi-O (1642) | Lost 1-2 | -181600 |
| 12draft | 10 | Nanjo, Masashi (1658) | Lost 1-2 | -171583 |
| 13draft | 79 | Kumoura, Daisuke (1803) | Won 2-0 | +221605 |
| 14draft | 14 | Hirooka, Toshiki (1582) | Lost 1-2 | -181587 |
| 15draft | 87 | Sugiyama, Kouichi (1616) | Won 2-1 | +181605 |
| top | average opponent: 1621record: 10-5 | new rating: 1605 | ||