Tozuka, Kouta
Current rating: 1658
Record: 88-68-2
- 2005
- 2008
- 2010
- 2011
- 2012
- 2013
- 2015
- 2016
- 2017
- 2018
- 2019
| Grand Prix Yokohama 2019 (modern) | starting rating: 1678 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 601 | Koshiishi, Tadahito (1535) | Lost 0-2 | -201658 |
| top | record: 0-1 | new rating: 1658 | ||
| Grand Prix Shizuoka 2018 (legacy) (legacy) | starting rating: 1691 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 307 | Kaneko, Yasuki (1543) | Won 2-1 | +151706 |
| 2legacy | 171 | Wada, Toshinori (1460) | Won 2-1 | +141720 |
| 3legacy | 105 | Kuriyama, Takuya (1440) | Lost 1-2 | -231697 |
| 4legacy | 272 | Nagata, Satoshi (1542) | Won 2-1 | +151712 |
| 5legacy | 149 | Takeuchi, Ryota (1800) | Lost 1-2 | -161696 |
| 6legacy | 280 | Matsumoto, Fumiya (1727) | Lost 1-2 | -181678 |
| top | average opponent: 1585record: 3-3 | new rating: 1678 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1669 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 114 | Akase, Kousuke (1491) | Won 2-1 | +141683 |
| 2sealed | 474 | Sakaguchi, Takuya (1475) | Won 2-0 | +151698 |
| 3sealed | 526 | Takatsuka, Yuuki (1554) | Lost 1-2 | -211677 |
| 4sealed | 616 | Hirayama, Hideyuki (1592) | Won 2-0 | +171694 |
| 5sealed | 453 | Nisio, Tomoyasu (1609) | Won 2-1 | +161710 |
| 6sealed | 104 | Matsumura, Toshikazu (1664) | Lost 1-2 | -191691 |
| top | average opponent: 1564record: 4-2 | new rating: 1691 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1686 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 568 | Kitaoka, Takaaki (1723) | Lost 0-2 | -171669 |
| top | record: 0-1 | new rating: 1669 | ||
| Grand Prix Chiba 2016 (legacy) | starting rating: 1740 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 352 | Takeda, Kengo (1539) | Won 2-1 | +141754 |
| 4legacy | 212 | Okuno, Ryota (1552) | Lost 1-2 | -211733 |
| 5legacy | 530 | Shiota, Akihiko (1612) | Won 2-1 | +161749 |
| 6legacy | 116 | Xiao, Han (1669) | Lost 1-2 | -201729 |
| 7legacy | 435 | Odaki, Rei (1550) | Lost 1-2 | -211708 |
| 8legacy | 669 | Noguchi, Takeshi (1482) | Lost 0-2 | -221686 |
| top | average opponent: 1568record: 2-4 | new rating: 1686 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1682 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 493 | Hayashi, Shingo (1465) | Lost 1-2 | -221660 |
| 3standard | 1249 | Kevis, Jeremy (1642) | Won 2-1 | +181678 |
| 4standard | 418 | Hui, Yew Woh (1513) | Lost 1-2 | -211657 |
| 5standard | 1237 | Yokoyama, Kenichi (1417) | Won 2-0 | +141671 |
| 6standard | 889 | Okada, Yoshikazu (1621) | Won 2-0 | +171688 |
| 7standard | 402 | Nakamura, Toshiya (1535) | Won 2-0 | +151703 |
| 8standard | 315 | Kakuta, Taisuke (1600) | Lost 1-2 | -201683 |
| 9standard | 456 | Suzuki, Kotarou (1512) | Won 2-1 | +151698 |
| 10standard | 301 | Nishizawa, Yasuhide (1662) | Won 2-0 | +181716 |
| 11standard | 153 | Takeda, Kendo (1570) | Won 2-0 | +151731 |
| 12standard | 123 | Chiba, Takato (1615) | Won 2-1 | +161747 |
| 13standard | 131 | Tinen, Kousuke (1633) | Draw 1-1 | -21745 |
| 14standard | 99 | Yoshimoto, Masanobu (1596) | Won 2-1 | +151760 |
| 15standard | 69 | Kataoka, Hiroaki (1652) | Lost 0-2 | -201740 |
| top | average opponent: 1574record: 9-4-1 | new rating: 1740 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1696 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 561 | Hara, Hiroyuki (1517) | Won 2-0 | +151711 |
| 3sealed | 2 | Aoki, Ryoya (1445) | Lost 0-2 | -231688 |
| 4sealed | 751 | Tsuji, Naoto (1535) | Won 2-0 | +151703 |
| 5sealed | 349 | Katakai, Masaki (1537) | Lost 0-2 | -211682 |
| top | average opponent: 1508record: 2-2 | new rating: 1682 | ||
| Grand Prix Kyoto 2015 (legacy) | starting rating: 1661 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 641 | Nakamura, Keisuke (1631) | Lost 1-2 | -191642 |
| 4legacy | 752 | Takai, Yuta (1538) | Won 2-1 | +161658 |
| 5legacy | 673 | Asai, Ryutaro (1598) | Won 2-0 | +171675 |
| 6legacy | 615 | Hangyo, Tatsuya (1548) | Won 2-0 | +161691 |
| 7legacy | 559 | Hirata, Koutatsu (1580) | Won 2-0 | +161707 |
| 8legacy | 510 | Omi, Tatsuya (1620) | Won 2-0 | +161723 |
| 9legacy | 508 | Saitou, Nobuo (1562) | Lost 0-2 | -211702 |
| 10legacy | 52 | Minegishi, Takuya (1593) | Won 2-1 | +161718 |
| 11legacy | 64 | Tsuruoka, Shouta (1802) | Won 2-1 | +201738 |
| 12legacy | 22 | Oonishi, Takahisa (1657) | Won 2-1 | +161754 |
| 13legacy | 6 | Miyazono, Takeshi (1732) | Lost 0-2 | -181736 |
| 14legacy | 33 | Yokoya, Hajime (1685) | Lost 1-2 | -191717 |
| 15legacy | 43 | Fujimoto, Youzou (1556) | Lost 0-2 | -211696 |
| top | average opponent: 1623record: 8-5 | new rating: 1696 | ||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1566 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 35 | Sudou, Kanoi (1500) | Won 2-1 | +171583 |
| 2sealed | 96 | Katsu, Masahiro (1386) | Lost 0-2 | -211562 |
| 3sealed | 427 | Oomori, Yasutomo (1498) | Won 2-0 | +171579 |
| 4sealed | 329 | Schwenk, Ryan (1267) | Won 2-1 | +121591 |
| 5sealed | 99 | Muranishi, Fumiya (1503) | Won 2-0 | +161607 |
| 6sealed | 46 | Ono, Masayuki (1469) | Won 2-1 | +161623 |
| 7sealed | 38 | Kajiwara, Shou (1576) | Won 2-0 | +171640 |
| 8sealed | 19 | Miyama, Hirozumi (1588) | Won 2-0 | +171657 |
| 9sealed | 14 | Imai, Satoshi (1741) | Won 2-1 | +201677 |
| 10draft | 9 | Yoshizumi, Tomohiro (1642) | Lost 0-2 | -191658 |
| 12draft | 34 | Takao, Akinao (1753) | Won 2-1 | +201678 |
| 13draft | 100 | Yabuta, Junichi (1798) | Lost 1-2 | -161662 |
| 14draft | 103 | Fujimori, Masayoshi (1666) | Won 2-0 | +181680 |
| 15draft | 33 | Ueda, Daisuke (1608) | Lost 1-2 | -191661 |
| top | average opponent: 1571record: 10-4 | new rating: 1661 | ||
| Grand Prix Shizuoka 2013 (THS standard) | starting rating: 1557 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 248 | Uesugi, Fumiya (1507) | Won 2-1 | +171574 |
| 2standard | 122 | Seko, Kazuki (1517) | Won 2-0 | +171591 |
| 3standard | 59 | Toyota, Kazuhisa (1495) | Lost 0-2 | -201571 |
| 4standard | 221 | Ishino, Takuya5590 (1483) | Won 2-1 | +171588 |
| 5standard | 104 | Anada, Takashi (1531) | Won 2-1 | +171605 |
| 6standard | 85 | Matsubara, Ichiro (1574) | Lost 1-2 | -191586 |
| 7standard | 125 | Hayakawa, Hikaru (1505) | Lost 0-2 | -201566 |
| top | average opponent: 1516record: 4-3 | new rating: 1566 | ||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1600 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 719 | Tsukamoto, Masato (1464) | Lost 1-2 | -201580 |
| 5sealed | 800 | Tsukamoto, Tatsushi (1453) | Won 2-1 | +151595 |
| 6sealed | 721 | Kanazawa, Takuya (1557) | Lost 1-2 | -181577 |
| 7sealed | 763 | Tazawa, Kazuho (1472) | Lost 1-2 | -201557 |
| top | average opponent: 1486record: 1-3 | new rating: 1557 | ||
| Grand Prix Nagoya 2012 (RTR standard) | starting rating: 1663 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 311 | Okita, Yuji (1596) | Lost 1-2 | -191644 |
| 3standard | 439 | Kuroda, Ryuhei (1482) | Lost 1-2 | -211623 |
| 4standard | 585 | Yoshizawa, Hiromi (1358) | Lost 1-2 | -231600 |
| top | average opponent: 1478record: 0-3 | new rating: 1600 | ||
| Grand Prix Yokohama 2012 (modern) | starting rating: 1627 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 417 | Kurosawa, Hiroki (1500) | Lost 1-2 | -211606 |
| 2modern | 439 | Toshida, Shin'ichi (1352) | Won 2-0 | +141620 |
| 3modern | 390 | Uchida, Hiroki (1464) | Won 2-1 | +151635 |
| 4modern | 439 | Okamoto, Yuuma (1587) | Won 2-0 | +171652 |
| 5modern | 199 | Abe, Yusuke (1514) | Lost 0-2 | -201632 |
| 6modern | 423 | Michiki, Kimihiko (1515) | Won 2-0 | +151647 |
| 7modern | 293 | Hori, Naomi (1502) | Won 2-0 | +161663 |
| 8modern | 106 | Terada, Shuuhei (1638) | Won 2-0 | +171680 |
| 9modern | 71 | Ikedo, Masakazu (1722) | Lost 1-2 | -171663 |
| top | average opponent: 1533record: 6-3 | new rating: 1663 | ||
| Grand Prix Kobe 2012 (DKA limited) | starting rating: 1640 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 126 | Wada, Takahide (1484) | Won 2-0 | +151655 |
| 3sealed | 88 | Urasawa, Taiji (1468) | Won 2-1 | +151670 |
| 4sealed | 132 | Ueda, Katsuya (1645) | Lost 1-2 | -191651 |
| 5sealed | 242 | Fukuta, Shingo (1538) | Won 2-1 | +161667 |
| 6sealed | 49 | Shinzato, Kazuaki (1539) | Lost 0-2 | -201647 |
| 7sealed | 185 | Sasaki, Tsuyoshi (1519) | Lost 1-2 | -201627 |
| top | average opponent: 1532record: 3-3 | new rating: 1627 | ||
| Grand Prix Hiroshima 2011 (ISD standard) | starting rating: 1631 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 60 | Hiyoshi, Tatsuhiko (1501) | Lost 1-2 | -201611 |
| 3standard | 171 | Nishimoto, Kouhei (1536) | Won 2-0 | +161627 |
| 4standard | 192 | Nakaoka, Koshiro (1529) | Lost 1-2 | -191608 |
| 5standard | 256 | Lemmon, Andrew (1486) | Won 2-1 | +151623 |
| 6standard | 231 | Shiwaku, Tsuyoshi (1743) | Won 2-1 | +211644 |
| 7standard | 107 | Tonouchi, Keita (1564) | Won 2-0 | +161660 |
| 8standard | 98 | Tasaki, Yasuhiro (1541) | Lost 1-2 | -201640 |
| top | average opponent: 1557record: 4-3 | new rating: 1640 | ||
| Grand Prix Kobe 2011 (extended) | starting rating: 1663 | |||
| round | table | opponent (rating) | result | Δrating |
| 4extended | 23 | Shoji, Kenta (1638) | Won 2-1 | +171680 |
| 5extended | 3 | Juza, Martin (1997) | Lost 1-2 | -121668 |
| 6extended | 59 | Minobe, Yoshihiro (1650) | Lost 0-2 | -191649 |
| 7extended | 140 | Matsuda, Issui (1631) | Lost 0-2 | -181631 |
| top | average opponent: 1729record: 1-3 | new rating: 1631 | ||
| Grand Prix Sendai 2010 (ROE standard) | starting rating: 1681 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 115 | Fujiya, Jun (1515) | Draw 1-1 | -31678 |
| 3standard | 121 | Tanaka, Kouichi (1570) | Won 2-0 | +161694 |
| 4standard | 130 | Date, Hideyuki (1543) | Lost 1-2 | -201674 |
| 5standard | 201 | Ono, Takaya (1518) | Won 2-1 | +151689 |
| 6standard | 134 | Okano, Yoshiki (1544) | Won 2-0 | +151704 |
| 7standard | 80 | Nagai, Mamoru (1505) | Lost 0-2 | -211683 |
| 8standard | 148 | Ashikaga, Masatoshi (1577) | Lost 0-2 | -201663 |
| top | average opponent: 1539record: 3-3-1 | new rating: 1663 | ||
| Grand Prix Yokohama 2010 (extended) | starting rating: 1621 | |||
| round | table | opponent (rating) | result | Δrating |
| 4extended | 115 | Kawada, Chihiro (1663) | Won 2-0 | +181639 |
| 5extended | 1 | Suzuki, Keisuke (1636) | Won 2-1 | +181657 |
| 6extended | 17 | Fukuta, Shingo (1739) | Won 2-0 | +201677 |
| 7extended | 8 | Kim, Min-su (Japan) (1754) | Lost 1-2 | -171660 |
| 8extended | 90 | Nakada, Ryo (1550) | Lost 0-2 | -201640 |
| 9extended | 79 | Sato, Takatoshi (1687) | Won 2-0 | +191659 |
| 10extended | 47 | Toshida, Shin'ichi (1451) | Won 2-1 | +141673 |
| 11extended | 25 | Wachi, Shinya (1712) | Lost 0-2 | -171656 |
| 12extended | 46 | Nagashima, Makoto (1760) | Won 2-1 | +201676 |
| 13extended | 23 | Yamashita, Hidetoshi (1749) | Lost 0-2 | -171659 |
| 14extended | 40 | Kibler, Brian (1889) | Won 2-1 | +221681 |
| 15extended | 22 | Shingai, Sara (1718) | ID | 01681 |
| top | average opponent: 1692record: 7-4-1 | new rating: 1681 | ||
| Grand Prix Okayama 2008 (ALA limited) | starting rating: 1602 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 238 | Deyama, Hirofumi (1313) | Lost 1-2 | -231579 |
| 3sealed | 243 | Umehara, Kei (1461) | Won 2-0 | +161595 |
| 4sealed | 258 | Takeda, Shinya (1467) | Won 2-0 | +151610 |
| 5sealed | 166 | Hayashi, Takatomo (1601) | Won 2-0 | +181628 |
| 6sealed | 3 | Tanabe, Kazuya (1307) | Won 2-0 | +131641 |
| 7sealed | 38 | Fuji, Yuusuke (1534) | Lost 1-2 | -201621 |
| top | average opponent: 1447record: 4-2 | new rating: 1621 | ||
| Grand Prix Kobe 2008 (Lorwyn block) | starting rating: 1567 | |||
| round | table | opponent (rating) | result | Δrating |
| 2block | 184 | Sasaki, Yuusuke (1557) | Won 2-0 | +181585 |
| 3block | 21 | Hayasaki, Yusuke (1554) | Won 2-1 | +171602 |
| 4block | 80 | Morisaki, Nobuki (1500) | Won 2-1 | +161618 |
| 5block | 31 | Uto, Yoshihiko (1557) | Lost 1-2 | -191599 |
| 6block | 97 | Sakurai, Taiki (1533) | Won 2-1 | +171616 |
| 7block | 46 | Asano, Jun'ya (1572) | Won 2-0 | +171633 |
| 8block | 33 | Shimizu, Akihiro (1680) | Won 2-0 | +191652 |
| 9block | 4 | Sawada, Ken (1653) | Lost 0-2 | -181634 |
| 10block | 19 | Ito, Atsushi (1490) | Won 2-1 | +151649 |
| 11block | 12 | Nakamura, Shuhei (1980) | Lost 1-2 | -121637 |
| 12block | 29 | Tashiro, Kouichi (1623) | Lost 1-2 | -181619 |
| 13block | 44 | Hayashi, Shinsuke (1729) | Lost 1-2 | -161603 |
| 14block | 47 | Jitsukawa, Naofumi (1597) | Lost 1-2 | -181585 |
| 15block | 17 | Nagaoka, Makoto (1544) | Won 2-0 | +171602 |
| top | average opponent: 1612record: 8-6 | new rating: 1602 | ||
| Grand Prix Shizuoka 2008 (MOR standard) | starting rating: 1524 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 177 | Hoshino, Shinsuke (1518) | Lost 1-2 | -181506 |
| 3standard | 248 | Hayashi, Masataka (1480) | Won 2-1 | +171523 |
| 4standard | 186 | Omori, Ken'ichirou (1528) | Lost 1-2 | -181505 |
| 5standard | 282 | Shouyama, Youhei (1589) | Won 2-0 | +201525 |
| 6standard | 126 | Matsumoto, Fumiya (1599) | Won 2-0 | +191544 |
| 7standard | 103 | Nakamura, Yusuke (1598) | Won 2-1 | +191563 |
| 8standard | 165 | Anan, Go (1718) | Won 2-1 | +211584 |
| 9standard | 155 | Tamura, Ryo (1632) | Lost 1-2 | -171567 |
| top | average opponent: 1583record: 5-3 | new rating: 1567 | ||
| Grand Prix Niigata 2005 (Kamigawa block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 18 | Miyasaka, Takeshi (1511) | Won 2-0 | +181518 |
| 2block | 2 | Nikkuni, Fumihito (1647) | Lost 0-2 | -151503 |
| 3block | 147 | Suzuki, Kenta (1580) | Won 2-0 | +191522 |
| 4block | 120 | Fujii, Hidekazu (1514) | Lost 0-2 | -181504 |
| 5block | 153 | Suzuki, Ryuuichi (1441) | Won 2-1 | +171521 |
| 6block | 103 | Anazawa, Yoshikazu (1660) | Won 2-0 | +201541 |
| 7block | 92 | Takagi, Yui (1569) | Lost 1-2 | -171524 |
| top | average opponent: 1560record: 4-3 | new rating: 1524 | ||