Mantani, Keiji
Current rating: 1659
Record: 69-49
Grand Prix Kobe 2001Grand Prix Kobe 2011Grand Prix Hiroshima 2011Grand Prix Kobe 2012Grand Prix Nagoya 2012Grand Prix Singapore 2013Grand Prix Kuala Lumpur 2014Grand Prix Nagoya 2014Grand Prix Kobe 2014Grand Prix Chiba 2015Grand Prix Singapore 2015Grand Prix Kobe 2015Grand Prix Kobe 2017Grand Prix Kyoto 2017Grand Prix Kyoto 2019
| Grand Prix Kyoto 2019 (RNA standard) | starting rating: 1688 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 114 | Mochizuki, Kazuhiro (1418) | Won 2-0 | +131701 |
| 2standard | 425 | Jinba, Daisuke (1465) | Won 2-0 | +141715 |
| 3standard | 168 | Nakashima, Atsushi (1957) | Lost 0-2 | -131702 |
| 4standard | 383 | Motokawa, Takusa (1518) | Lost 1-2 | -221680 |
| 5standard | 704 | Ikemoto, Syota (1504) | Lost 0-2 | -211659 |
| top | average opponent: 1572record: 2-3 | new rating: 1659 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1744 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 102 | Kimbara, Shohei (1464) | Won 2-0 | +131757 |
| 2sealed | 487 | Furusawa, Reona (1470) | Lost 0-2 | -231734 |
| 3sealed | 718 | Morimine, Seiya (1509) | Lost 1-2 | -221712 |
| 4sealed | 868 | Teramoto, Tsubasa (1400) | Lost 0-2 | -241688 |
| top | average opponent: 1461record: 1-3 | new rating: 1688 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1739 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 129 | Kajimura, Ryu (1468) | Won 2-0 | +131752 |
| 3modern | 45 | Kawabata, Yuji (1604) | Lost 1-2 | -211731 |
| 4modern | 781 | Tsuchiya, Yoshihiro (1358) | Won 2-0 | +121743 |
| 5modern | 288 | Gao, Jun (1557) | Lost 1-2 | -221721 |
| 6modern | 708 | Takahashi, Daichi (1501) | Won 2-1 | +141735 |
| 7modern | 364 | Hirato, Ougi (1770) | Won 2-1 | +191754 |
| 8modern | 171 | Kaga, Hiroyuki (1586) | Won 2-0 | +151769 |
| 9modern | 141 | Hayashi, Daisuke (1696) | Won 2-0 | +161785 |
| 10modern | 78 | Sugita, Wataru (1679) | Lost 1-2 | -191766 |
| 11modern | 265 | Sakurai, Hiromi (1565) | Lost 0-2 | -221744 |
| top | average opponent: 1578record: 6-4 | new rating: 1744 | ||
| Grand Prix Kobe 2015 (BFZ standard) | starting rating: 1768 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 273 | Suzuki, Towa (1445) | Won 2-0 | +121780 |
| 3standard | 457 | Yamashita, Kohji (1167) | Won 2-1 | +81788 |
| 4standard | 167 | Shimada, Masahiko (1656) | Lost 1-2 | -201768 |
| 5standard | 264 | Miyamoto, Hiroya (1694) | Won 2-0 | +171785 |
| 6standard | 115 | Satomura, Shunsuke (1626) | Lost 0-2 | -211764 |
| 7standard | 420 | Sugaya, Hironobu (1837) | Lost 1-2 | -171747 |
| 8standard | 507 | Taniguchi, Reo (1492) | Won 2-1 | +131760 |
| 9standard | 324 | Norikazu, Nishina (1540) | Lost 0-2 | -211739 |
| top | average opponent: 1557record: 4-4 | new rating: 1739 | ||
| Grand Prix Singapore 2015 (modern) | starting rating: 1787 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 107 | Yee Lun Ng, Elon (1536) | Lost 0-2 | -221765 |
| 4modern | 182 | Tan, Frederick (1513) | Lost 1-2 | -231742 |
| 5modern | 364 | Ng, Thengwei (1511) | Won 2-1 | +141756 |
| 6modern | 316 | Loh, James Jie Ling (1515) | Won 2-1 | +141770 |
| 7modern | 116 | Ikawa, Yoshihiko (1892) | Lost 0-2 | -161754 |
| 8modern | 238 | Lim, Yi Xiong Anselm (1527) | Won 2-0 | +141768 |
| top | average opponent: 1582record: 3-3 | new rating: 1768 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1786 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 210 | Oishi, Haruka (1529) | Won 2-0 | +141800 |
| 3sealed | 39 | Choi, Kiho (1457) | Won 2-0 | +121812 |
| 4sealed | 114 | Matsubara, Shingo (1563) | Won 2-0 | +131825 |
| 5sealed | 41 | Oonishi, Takahisa (1636) | Lost 1-2 | -211804 |
| 6sealed | 41 | Shigehisa, Tetsuya (1561) | Won 2-0 | +131817 |
| 7sealed | 84 | Bachura, Miroslav (1606) | Won 2-1 | +151832 |
| 8sealed | 30 | Horiuchi, Makoto (1596) | Lost 0-2 | -231809 |
| 9sealed | 72 | Nishiyama, Takashi (1578) | Lost 1-2 | -221787 |
| top | average opponent: 1566record: 5-3 | new rating: 1787 | ||
| Grand Prix Kobe 2014 (modern) | starting rating: 1707 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 151 | Kirito, Keisuke (1689) | Won 2-0 | +171724 |
| 4modern | 65 | Sato, Tatsuo (1519) | Won 2-1 | +151739 |
| 5modern | 44 | Takao, Shota (1907) | Won 2-0 | +211760 |
| 6modern | 61 | Cho, Kou (1800) | Lost 0-2 | -181742 |
| 7modern | 100 | Mori, Katsuhiro (2058) | Won 2-0 | +241766 |
| 8modern | 58 | Terada, Shuuhei (1737) | Won 2-1 | +171783 |
| 9modern | 57 | Matsuda, Issui (1753) | Lost 0-2 | -181765 |
| 10modern | 65 | Hino, Yoshiaki (1634) | Lost 1-2 | -201745 |
| 11modern | 89 | Sato, Kazuhito (1516) | Lost 0-2 | -231722 |
| 12modern | 119 | Kawaguchi, Tetsu (1508) | Won 2-0 | +151737 |
| 13modern | 106 | Oldziey, Kalim (1748) | Won 2-1 | +181755 |
| 14modern | 75 | Satou, Ryota (1660) | Won 2-0 | +161771 |
| 15modern | 61 | Ozawa, Koji (1613) | Won 2-0 | +151786 |
| top | average opponent: 1703record: 9-4 | new rating: 1786 | ||
| Grand Prix Nagoya 2014 (BNG limited) | starting rating: 1684 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 138 | Murata, Toshiaki (1825) | Lost 1-2 | -151669 |
| 3sealed | 313 | Suzuki, Masaya (1414) | Won 2-0 | +131682 |
| 4sealed | 273 | Urano, Syouhei (1483) | Won 2-0 | +151697 |
| 5sealed | 109 | Yoshimori, Sho (1725) | Won 2-1 | +181715 |
| 6sealed | 61 | Koyama, Masashi (1593) | Lost 1-2 | -201695 |
| 7sealed | 107 | Hagiwara, Masakatsu (1604) | Won 2-1 | +161711 |
| 8sealed | 102 | Hasegawa, Kazunari (1550) | Won 2-0 | +151726 |
| 9sealed | 70 | Yuasa, Kentarou (1637) | Lost 0-2 | -191707 |
| top | average opponent: 1604record: 5-3 | new rating: 1707 | ||
| Grand Prix Kuala Lumpur 2014 (THS limited) | starting rating: 1603 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 292 | Lee, Kaifa (1555) | Lost 0-2 | -191584 |
| 2sealed | 338 | Md Noor, Noor Afandi (1507) | Lost 1-2 | -191565 |
| 3sealed | 384 | Choo, Yong Han (1961) | Won 2-0 | +241589 |
| 4sealed | 394 | Ibrahim, Khairil (1478) | Won 2-0 | +161605 |
| 5sealed | 252 | Phoon, John (1499) | Won 2-0 | +161621 |
| 6sealed | 248 | Tan, Kuan Ming Kevin (1518) | Won 2-0 | +171638 |
| 7sealed | 167 | Tan, Freddy (1532) | Won 2-1 | +161654 |
| 8sealed | 122 | Wong, Nicholas Jonathan (1792) | Won 2-1 | +201674 |
| 9sealed | 62 | Lim, Yong Chin (1536) | Won 2-0 | +161690 |
| 10draft | 50 | Liu, Zuoren (1604) | Won 2-0 | +161706 |
| 11draft | 10 | Tang, Ker An Timothy (1625) | Won 2-1 | +171723 |
| 12draft | 22 | Sim, Chapman (1817) | Lost 1-2 | -171706 |
| 13draft | 57 | Amundsen, Rune (1688) | Lost 0-2 | -181688 |
| 14draft | 5 | Sushkov, Vasily (1586) | Won 2-0 | +161704 |
| 15draft | 30 | Eing Yung, Lee (1594) | Lost 1-2 | -201684 |
| top | average opponent: 1620record: 10-5 | new rating: 1684 | ||
| Grand Prix Singapore 2013 (RTR limited) | starting rating: 1591 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 260 | Chew, Mickey Kian Ngia (1500) | Won 2-1 | +171608 |
| 2sealed | 136 | Sudibyo, Chrisandi (1503) | Won 2-1 | +161624 |
| 3sealed | 77 | Tan, Steven (1644) | Lost 0-2 | -181606 |
| 4sealed | 234 | Nge, Nicholas Jing Sho (1520) | Won 2-0 | +171623 |
| 5sealed | 126 | Feng, Kuo (1519) | Lost 0-2 | -201603 |
| top | average opponent: 1537record: 3-2 | new rating: 1603 | ||
| Grand Prix Nagoya 2012 (RTR standard) | starting rating: 1564 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 101 | Yamasita, Akinori (1482) | Won 2-0 | +161580 |
| 2standard | 161 | Sugisawa, Tsuyoshi (1564) | Lost 0-2 | -181562 |
| 3standard | 454 | Uesugi, Fumiya (1414) | Won 2-0 | +151577 |
| 4standard | 475 | Fukui, Shunsuke (1492) | Won 2-0 | +171594 |
| 5standard | 348 | Takahashi, Kazuya (1578) | Won 2-1 | +171611 |
| 6standard | 221 | Shimada, Atsuki (1660) | Lost 0-2 | -171594 |
| 7standard | 294 | Nomura, Takeshi (1537) | Won 2-0 | +171611 |
| 8standard | 141 | Takibana, Hitoshi (1516) | Lost 0-2 | -201591 |
| top | average opponent: 1530record: 5-3 | new rating: 1591 | ||
| Grand Prix Kobe 2012 (DKA limited) | starting rating: 1601 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 44 | Ito, Hayato (1518) | Lost 0-2 | -191582 |
| 3sealed | 263 | Kawaguchi, Takahiro (1472) | Won 2-0 | +161598 |
| 4sealed | 199 | Moriya, Toshihiko (1629) | Lost 1-2 | -171581 |
| 5sealed | 281 | Sanno, Naoki (1640) | Lost 0-2 | -171564 |
| top | average opponent: 1565record: 1-3 | new rating: 1564 | ||
| Grand Prix Hiroshima 2011 (ISD standard) | starting rating: 1563 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 242 | Ikeda, Naoto (1311) | Won 2-0 | +141577 |
| 2standard | 46 | Kusunoki, Hiroyuki (1518) | Won 2-0 | +171594 |
| 3standard | 27 | Nagami, Youichi (1542) | Won 2-1 | +171611 |
| 4standard | 74 | Oohashi, Toshiya (1604) | Lost 0-2 | -181593 |
| 5standard | 148 | Narumiya, Ryuuma (1516) | Won 2-1 | +161609 |
| 6standard | 79 | Fujita, Osamu (1938) | Won 2-1 | +241633 |
| 7standard | 56 | Morita, Masahiko (1956) | Lost 1-2 | -121621 |
| 8standard | 120 | Tokoro, Masanori (1552) | Lost 0-2 | -201601 |
| top | average opponent: 1617record: 5-3 | new rating: 1601 | ||
| Grand Prix Kobe 2011 (extended) | starting rating: 1553 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 45 | Tajima, Kenji (1459) | Won 2-0 | +161569 |
| 2extended | 60 | Kawashita, Makoto (1518) | Lost 0-2 | -191550 |
| 3extended | 174 | Izumi, Kimiaki (1515) | Lost 0-2 | -191531 |
| 4extended | 250 | Takada, Ryo (1320) | Won 2-0 | +151546 |
| 5extended | 168 | Ootani, Tomohiro (1501) | Won 1-0 | +171563 |
| 6extended | 155 | Oodan, Takeshi (1563) | Won 2-1 | +181581 |
| 7extended | 67 | Kusadani, Takehiko (1612) | Lost 0-2 | -181563 |
| top | average opponent: 1498record: 4-3 | new rating: 1563 | ||
| Grand Prix Kobe 2001 (Invasion block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 424 | Ozaki, Youichirou (1500) | Won 2-0 | +181518 |
| 2block | 171 | Terasawa, Kazuya (1500) | Lost 0-2 | -181500 |
| 3block | 360 | Mizuno, Sho (1500) | Won 2-0 | +181518 |
| 4block | 379 | Nakai, Nobuyuki (1499) | Won 2-1 | +171535 |
| 5block | 210 | Aoki, Haruchika (1536) | Won 2-1 | +181553 |
| 6block | 76 | Ito, Kenta (1519) | Won 2-1 | +181571 |
| 7block | 59 | Kageyama, Kiyotomo (1563) | Lost 0-2 | -181553 |
| 8block | 76 | Horiuchi, Kohei (1553) | Won 2-1 | +181571 |
| 9block | 93 | Mochiduki, Masashi (1572) | Lost 1-2 | -181553 |
| top | average opponent: 1527record: 6-3 | new rating: 1553 | ||