Kokubun, Takeshi
Current rating: 1734 (#4633)
Record: 70-45-1
| Grand Prix Nagoya 2020 (pioneer) | starting rating: 1634 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 216 | Noguchi, Eita (1500) | Won 2-0 | +151649 |
| 2pioneer | 17 | Choi, Kiho (1533) | Lost 1-2 | -201629 |
| 3pioneer | 614 | Chou, Takayuki (1556) | Won 2-1 | +171646 |
| 4pioneer | 288 | Ota, Masahito (1481) | Won 2-1 | +151661 |
| 5pioneer | 329 | Kuribara, Shuta (1659) | Lost 1-2 | -181643 |
| 6pioneer | 258 | Jung, Yong Hyuk (1680) | Won 2-1 | +181661 |
| 7pioneer | 292 | Okada, Riku (1570) | Won 2-1 | +171678 |
| 8pioneer | 134 | Okita, Akito (1483) | Won 2-1 | +141692 |
| 9pioneer | 131 | Mihara, Yuki (1675) | Lost 0-2 | -181674 |
| 10pioneer | 114 | Kawamura, Naoki (1517) | Won 2-0 | +151689 |
| 11pioneer | 76 | Iizuka, Hirofumi (1532) | Won 2-1 | +151704 |
| 12pioneer | 79 | Arakawa, Tomohiro (1584) | Won 2-1 | +161720 |
| 13pioneer | 37 | Wataya, Yosuke (1619) | Won 2-1 | +161736 |
| 14pioneer | 26 | Yamamoto, Takashi (1590) | Won 2-0 | +161752 |
| 15pioneer | 28 | Nakada, Ryo (1753) | Lost 1-2 | -181734 |
| top | average opponent: 1582record: 11-4 | new rating: 1734 | ||
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1696 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 518 | Naitou, Keisuke (1647) | Lost 0-2 | -191677 |
| 2sealed | 695 | Nakanishi, Takahide (1478) | Lost 1-2 | -221655 |
| 3sealed | 985 | Ohno, Masaki (1464) | Lost 1-2 | -211634 |
| top | average opponent: 1530record: 0-3 | new rating: 1634 | ||
| Grand Prix Kyoto 2019 (RNA standard) | starting rating: 1712 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 56 | Maruyama, Yuichiro (1590) | Won 2-1 | +151727 |
| 4standard | 174 | Matsumoto, Yuki2978 (1990) | Won 2-1 | +231750 |
| 5standard | 55 | Yada, Kazuki (1952) | Lost 1-2 | -141736 |
| 6standard | 126 | Nakamichi, Daisuke (1762) | Lost 0-2 | -181718 |
| 7standard | 301 | Hayashi, Hisaaki (1463) | Lost 0-2 | -221696 |
| top | average opponent: 1751record: 2-3 | new rating: 1696 | ||
| Grand Prix Shizuoka 2018 (standard) (GRN standard) | starting rating: 1704 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 546 | Kazami, Hayato (1487) | Lost 0-2 | -221682 |
| 2standard | 840 | Beppu, Yoshihiro (1341) | Won 2-1 | +121694 |
| 3standard | 860 | Mimura, Takeshi (1498) | Won 2-0 | +151709 |
| 4standard | 667 | Tanaka, Mizuki (1483) | Won 2-0 | +141723 |
| 5standard | 516 | Matsumura, Shinya (1414) | Won 2-0 | +121735 |
| 6standard | 296 | Ootani, Yousuke (1633) | Lost 0-2 | -201715 |
| 7standard | 415 | Iwasaki, Mitsumasa (1480) | Won 2-1 | +141729 |
| 8standard | 288 | Kubota, Muneaki (1755) | Lost 1-2 | -171712 |
| top | average opponent: 1511record: 5-3 | new rating: 1712 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1725 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 708 | Aoki, Ryoya (1541) | Won 2-0 | +151740 |
| 2sealed | 34 | Enatsu, Hiroaki (1512) | Lost 0-2 | -221718 |
| 3sealed | 853 | Saito, Shunsuke (1500) | Won 2-0 | +141732 |
| 4sealed | 552 | Sasaki, Shou (1611) | Won 2-1 | +151747 |
| 5sealed | 374 | Akase, Kousuke (1495) | Won 2-0 | +141761 |
| 6sealed | 96 | Ikawa, Yoshihiko (1873) | Lost 1-2 | -161745 |
| 7sealed | 426 | Takano, Natsuki (1542) | Won 2-1 | +141759 |
| 8sealed | 272 | Kamiya, Kazuhiro (1501) | Won 2-0 | +141773 |
| 9sealed | 81 | Sugiyama, Yuya (1909) | Lost 1-2 | -161757 |
| 10draft | 648 | Satou, Takahisa (1545) | Won 2-0 | +141771 |
| 11draft | 643 | Ishizaki, Yoshiki (1636) | Won 2-1 | +161787 |
| 12draft | 642 | Morita, Akira (1647) | Lost 1-2 | -211766 |
| 13draft | 581 | Sato, Motohiko (1718) | Lost 1-2 | -181748 |
| 14draft | 616 | Ishii, Masashi (1446) | Lost 0-2 | -241724 |
| 15draft | 643 | Kubo, Hirotaka (1605) | Lost 1-2 | -201704 |
| top | average opponent: 1605record: 8-7 | new rating: 1704 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1701 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 283 | Ando, Satoru (1419) | Won 2-0 | +131714 |
| 2sealed | 312 | Hasebe, Sho (1610) | Won 2-1 | +161730 |
| 3sealed | 427 | Okuda, Masateru (1599) | Lost 1-2 | -211709 |
| 4sealed | 444 | Higuchi, Jun (1683) | Won 2-1 | +181727 |
| 5sealed | 478 | Mori, Takeshi (1704) | Lost 0-2 | -191708 |
| 6sealed | 655 | Kashiwagi, Yuki (1452) | Won 2-0 | +141722 |
| 7sealed | 426 | Samejima, Ippei (1640) | Draw 1-1 | -21720 |
| 8sealed | 389 | Ohtsu, Minami (1574) | Won 2-1 | +161736 |
| 9sealed | 262 | Igarashi, Hisakazu (1543) | Won 2-0 | +141750 |
| 10draft | 344 | Hada, Nobuto (1734) | Lost 1-2 | -181732 |
| 11draft | 43 | Lee, Jaejeong (1581) | Lost 1-2 | -211711 |
| 12draft | 126 | Hayashi, Masashi (1475) | Won 2-0 | +141725 |
| top | average opponent: 1584record: 7-4-1 | new rating: 1725 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1713 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 378 | Takeuchi, Makoto (1586) | Won 2-1 | +161729 |
| 2standard | 70 | Ainai, Taku (1514) | Lost 0-2 | -221707 |
| 3standard | 1042 | Ikebata, Yusuke (1375) | Lost 1-2 | -241683 |
| 4standard | 1081 | Takemura, Ukyou (1435) | Won 2-0 | +141697 |
| 5standard | 966 | Kaneko, Masayuki (1604) | Lost 1-2 | -201677 |
| 6standard | 897 | Nakai, Kenichiro (1473) | Won 2-0 | +151692 |
| 7standard | 738 | Nobata, Tatsuya (1504) | Won 2-0 | +141706 |
| 8standard | 693 | Murao, Keisuke (1594) | Won 2-1 | +161722 |
| 9standard | 432 | Hashimoto, Keisuke3846 (1524) | Lost 1-2 | -211701 |
| top | average opponent: 1512record: 5-4 | new rating: 1701 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1749 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 480 | Meura, Tomohide (1500) | Lost 1-2 | -221727 |
| 2standard | 812 | Machida, Takahiro (1759) | Won 2-0 | +191746 |
| 3standard | 1059 | Shimizu, Junji (1612) | Lost 0-2 | -211725 |
| 4standard | 1290 | Tokumine, Makoto (1412) | Won 2-0 | +131738 |
| 5standard | 1078 | Yoshihara, Tomoki (1621) | Won 2-0 | +151753 |
| 6standard | 535 | Kudou, Koudai (1570) | Lost 0-2 | -211732 |
| 7standard | 1018 | Harada, Dampei (1692) | Lost 0-2 | -191713 |
| top | average opponent: 1595record: 3-4 | new rating: 1713 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1671 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 50 | Tsukitani, Takashi (1483) | Won 2-0 | +151686 |
| 2sealed | 100 | Hamano, Kouhei (1502) | Won 2-0 | +141700 |
| 3sealed | 295 | Nakanishi, Yutaka (1560) | Won 2-1 | +161716 |
| 4sealed | 90 | Matsuda, Yukio (1517) | Won 2-0 | +141730 |
| 5sealed | 118 | Iwase, Akira (1726) | Won 2-0 | +181748 |
| 6sealed | 10 | Maruo, Yuuta (1759) | Won 2-0 | +181766 |
| 7sealed | 35 | Miyazono, Takeshi (1830) | Won 2-1 | +191785 |
| 8sealed | 6 | Taniguchi, Reo (1587) | Lost 1-2 | -211764 |
| 9sealed | 53 | Kojima, Daiki (1647) | Won 2-0 | +161780 |
| 10draft | 165 | Hirose, Yoshiyuki (1605) | Lost 0-2 | -211759 |
| 11draft | 6 | Kitauchi, Kazuya (1645) | Lost 0-2 | -201739 |
| 12draft | 244 | Haji, Satoshi (1636) | Lost 0-2 | -201719 |
| 13draft | 316 | Kabashima, Takuya (1579) | Won 2-0 | +151734 |
| 14draft | 212 | Choi, Jaekyoo (1581) | Won 2-0 | +151749 |
| top | average opponent: 1618record: 10-4 | new rating: 1749 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1639 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1023 | Hattori, Yoshiki (1500) | Won 2-1 | +161655 |
| 2sealed | 1174 | Fukuda, Tatsuya (1515) | Won 2-1 | +151670 |
| 3sealed | 823 | Handa, Takuya (1498) | Won 2-0 | +151685 |
| 4sealed | 858 | Ichige, Kouhei (1553) | Lost 0-2 | -201665 |
| 5sealed | 879 | Fujita, Yoshito (1535) | Won 2-0 | +151680 |
| 6sealed | 935 | Sasaki, Yasuhiro (1579) | Won 2-1 | +161696 |
| 7sealed | 855 | Itou, Satoru (1678) | Won 2-1 | +181714 |
| 8sealed | 828 | Sone, Shuhei (1527) | Lost 0-2 | -211693 |
| 9sealed | 896 | Miyoshi, Yasufumi (1493) | Lost 1-2 | -221671 |
| top | average opponent: 1542record: 6-3 | new rating: 1671 | ||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1458 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 869 | Ohtuka, Shinnosuke (1500) | Won 2-1 | +191477 |
| 2sealed | 646 | Moore, David [USA] (1514) | Lost 1-2 | -181459 |
| 3sealed | 863 | Ito, Ken (1690) | Lost 1-2 | -141445 |
| 4sealed | 1009 | Itou, Daiki (1427) | Won 2-1 | +181463 |
| 5sealed | 918 | Mialaret, Gary (1504) | Won 2-0 | +191482 |
| 6sealed | 811 | Shimano, Yusuke (1520) | Won 2-0 | +181500 |
| 7sealed | 789 | Sato, Koji (1493) | Won 2-0 | +181518 |
| 8sealed | 682 | Nishihara, Hideyuki (1559) | Won 2-0 | +191537 |
| 9sealed | 633 | Kawakami, Tetsuya (1584) | Won 2-1 | +191556 |
| 10draft | 78 | Ishiguro, Satoshi (1587) | Won 2-1 | +181574 |
| 11draft | 104 | Fukudome, Yuu (1622) | Won 2-1 | +191593 |
| 12draft | 41 | Miyano, Shinichi (1631) | Won 2-1 | +191612 |
| 13draft | 101 | Sun, Bo (1873) | Lost 1-2 | -131599 |
| 14draft | 54 | Hori, Masataka (1620) | Won 2-0 | +181617 |
| 15draft | 24 | Ushio, Atsushi (1841) | Won 2-0 | +221639 |
| top | average opponent: 1598record: 12-3 | new rating: 1639 | ||
| Grand Prix Yokohama 2012 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 219 | Yoshida, Mitsutaka (1200) | Lost 0-2 | -231477 |
| 2modern | 647 | Takeuchi, Shuuji (1449) | Won 2-1 | +171494 |
| 3modern | 394 | Yamada, Takaaki (1500) | Lost 1-2 | -181476 |
| 4modern | 583 | Ishihara, Akiho (1447) | Lost 0-2 | -181458 |
| top | average opponent: 1399record: 1-3 | new rating: 1458 | ||