Kosaka, Ryohei
Current rating: 1535
Record: 56-65-2
- 2013
- 2014
- 2015
- 2016
- 2017
- 2018
- 2019
- 2020
| Grand Prix Nagoya 2020 (pioneer) | starting rating: 1548 | |||
| round | table | opponent (rating) | result | Δrating |
| 3pioneer | 314 | Sugimoto, Takashi (1544) | Won 2-0 | +181566 |
| 4pioneer | 96 | Sawada, Tetsushi (1631) | Won 2-1 | +191585 |
| 5pioneer | 12 | Omi, Tatsuya (1617) | Lost 0-2 | -171568 |
| 6pioneer | 78 | Kim, Kyungho (1576) | Lost 1-2 | -181550 |
| 7pioneer | 156 | Furuya, Youhei (1734) | Lost 1-2 | -151535 |
| top | average opponent: 1620record: 2-3 | new rating: 1535 | ||
| Grand Prix Nagoya 2019 (ELD standard) | starting rating: 1551 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 258 | Mihara, Takuya (1447) | Draw 1-1 | -21549 |
| 3standard | 471 | Mizuno, Yuya (1404) | Won 2-0 | +151564 |
| 4standard | 242 | Iwatsuki, Takanori (1595) | Won 2-1 | +191583 |
| 5standard | 120 | Takakura, Shinichirou (1642) | Won 2-0 | +191602 |
| 6standard | 56 | Yanaseko, Kentarou (1613) | Lost 1-2 | -181584 |
| 7standard | 175 | Harada, Ryoichi (1539) | Lost 1-2 | -191565 |
| 8standard | 294 | Yoshikawa, Hidenobu (1598) | Lost 1-2 | -171548 |
| top | average opponent: 1548record: 3-3-1 | new rating: 1548 | ||
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1430 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 130 | Ookawai, Yuu (1442) | Won 2-1 | +181448 |
| 3sealed | 435 | Asano, Kurenai (1647) | Won 2-0 | +221470 |
| 4sealed | 74 | Katsuragi, Atsushi (1591) | Won 2-0 | +201490 |
| 5sealed | 79 | Okita, Akito (1475) | Won 2-0 | +181508 |
| 6sealed | 24 | Takakura, Shinichirou (1493) | Won 2-1 | +181526 |
| 7sealed | 22 | Ishikawa, Masahide (1856) | Won 2-0 | +231549 |
| 8sealed | 3 | Wa, Ho (1724) | Won 2-1 | +221571 |
| 9sealed | 5 | Liu, Yuchen (2004) | Won 2-0 | +251596 |
| 10draft | 104 | Han, Bing (2035) | Lost 0-2 | -101586 |
| 11draft | 101 | Kashima, Akihiro (1800) | Lost 1-2 | -151571 |
| 12draft | 103 | Wang, Alfred (1640) | Won 2-1 | +201591 |
| 13draft | 102 | Mitsui, Hideo (1824) | Lost 1-2 | -141577 |
| 14draft | 4 | Yoshino, Kohei (1728) | Lost 1-2 | -151562 |
| 15draft | 124 | Zhi, Yimin (1982) | Lost 0-2 | -111551 |
| top | average opponent: 1732record: 9-5 | new rating: 1551 | ||
| Grand Prix Yokohama 2019 (modern) | starting rating: 1449 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 407 | Nishita, Taro (1518) | Lost 0-2 | -161433 |
| 3modern | 718 | Ikeda, Hidenari (1467) | Lost 0-2 | -181415 |
| 4modern | 983 | Ishikawa, Yusuke (1464) | Won 2-1 | +191434 |
| 5modern | 775 | Komizo, Kouichi (1208) | Won 2-0 | +141448 |
| 6modern | 428 | Yamasaki, Yuuta (1447) | Lost 0-2 | -181430 |
| top | average opponent: 1421record: 2-3 | new rating: 1430 | ||
| Grand Prix Kyoto 2019 (RNA standard) | starting rating: 1451 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 322 | Takafuji, Masato (1591) | Won 2-0 | +201471 |
| 3standard | 443 | Tsao, Wen-Hung (1536) | Lost 1-2 | -171454 |
| 4standard | 287 | Wada, Yuki (1895) | Lost 0-2 | -101444 |
| 5standard | 711 | Hirase, Gun (1632) | Won 2-1 | +211465 |
| 6standard | 510 | Sawada, Taku (1519) | Lost 1-2 | -171448 |
| 7standard | 499 | Murata, Futoshi (1466) | Won 2-0 | +191467 |
| 8standard | 356 | Xu, Yuantai (1517) | Lost 0-2 | -181449 |
| top | average opponent: 1594record: 3-4 | new rating: 1449 | ||
| Grand Prix Shizuoka 2018 (standard) (GRN standard) | starting rating: 1400 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 224 | Tanaka, Takayuki5764 (1506) | Won 2-1 | +201420 |
| 2standard | 190 | Itakura, Kenichi (1471) | Lost 0-2 | -171403 |
| 3standard | 705 | Tanaka, Kento (1661) | Won 2-1 | +231426 |
| 4standard | 647 | Ma, Haobo (1463) | Won 2-1 | +181444 |
| 5standard | 455 | Demura, Mitsuhiro (1396) | Won 2-1 | +181462 |
| 6standard | 394 | Tsukahara, Kazuto (1720) | Won 2-1 | +221484 |
| 7standard | 258 | Ojima, Toshiaki (1470) | Lost 1-2 | -181466 |
| 8standard | 351 | Watanabe, Takefumi (1611) | Lost 1-2 | -151451 |
| top | average opponent: 1537record: 5-3 | new rating: 1451 | ||
| Grand Prix Shizuoka 2018 (legacy) (legacy) | starting rating: 1411 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 36 | Kudo, Amiru (1483) | Won 2-1 | +191430 |
| 2legacy | 66 | Ideue, Yuuki (1510) | Lost 0-2 | -161414 |
| 3legacy | 474 | Hirosawa, Yuki (1363) | Lost 1-2 | -191395 |
| 4legacy | 502 | Shiozaki, Ryota (1486) | Won 2-0 | +201415 |
| 5legacy | 518 | Makino, Hiroyuki (1622) | Lost 1-2 | -151400 |
| top | average opponent: 1493record: 2-3 | new rating: 1400 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1347 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 523 | Abe, Takashi (1751) | Won 2-1 | +251372 |
| 2sealed | 539 | Miyajima, Kenichi (1518) | Lost 0-2 | -151357 |
| 3sealed | 824 | Sato, Takatoshi (1752) | Lost 0-2 | -121345 |
| 4sealed | 990 | Ogawa, Yusuke (1486) | Won 2-1 | +211366 |
| 5sealed | 740 | Onoue, Masanobu (1507) | Won 2-1 | +211387 |
| 6sealed | 573 | Imai, Kenta (1650) | Won 2-0 | +221409 |
| 7sealed | 350 | Hasegawa, Shinpei (1345) | Won 2-1 | +171426 |
| 8sealed | 257 | Iino, Ryuji (1595) | Lost 0-2 | -151411 |
| top | average opponent: 1575record: 5-3 | new rating: 1411 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1364 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 536 | Nagafuchi, Takayuki (1463) | Won 2-1 | +191383 |
| 2sealed | 102 | Yokota, Masaaki (1532) | Lost 0-2 | -151368 |
| 3sealed | 638 | Naitou, Takashi (1736) | Lost 0-2 | -111357 |
| 4sealed | 1035 | Egawa, Mitsuki (1483) | Lost 1-2 | -161341 |
| 5sealed | 996 | Yanagawa, Hironori (1463) | Won 2-0 | +201361 |
| 6sealed | 907 | Katagiri, Shinichi (1575) | Lost 0-2 | -141347 |
| top | average opponent: 1542record: 2-4 | new rating: 1347 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1386 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 202 | Johnson, Patrick 2 (1524) | Lost 1-2 | -161370 |
| 2modern | 767 | Sato, Yusuke (1532) | Lost 0-2 | -151355 |
| 3modern | 1242 | Hirai, Kento (1544) | Lost 1-2 | -141341 |
| 4modern | 1266 | Itoh, Yoshio (1346) | Lost 0-2 | -181323 |
| 5modern | 1286 | Ihara, Akihiro (1285) | Won 2-0 | +171340 |
| 6modern | 1185 | Tamamura, Hideya (1451) | Won 2-1 | +201360 |
| 7modern | 1048 | Uemura, Kousuke (1462) | Won 2-1 | +201380 |
| 8modern | 854 | Yoshida, Kazuaki (1475) | Lost 1-2 | -161364 |
| top | average opponent: 1452record: 3-5 | new rating: 1364 | ||
| Grand Prix Chiba 2016 (legacy) | starting rating: 1345 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 105 | Kuroda, Akihiro (1468) | Lost 0-2 | -161329 |
| 2legacy | 618 | Ueno, Kota (1537) | Lost 0-2 | -141315 |
| 3legacy | 1038 | Ogata, Kenji (1386) | Won 2-0 | +191334 |
| 4legacy | 848 | Maekawa, Takamori (1453) | Won 2-0 | +201354 |
| 5legacy | 888 | Toyohara, Eisuke (1411) | Won 2-1 | +191373 |
| 6legacy | 582 | Takahashi, Kento (1522) | Lost 1-2 | -151358 |
| 7legacy | 796 | Owada, Kazuya (1433) | Won 2-0 | +201378 |
| 8legacy | 551 | Yamagami, Yudai (1710) | Lost 1-2 | -131365 |
| 9legacy | 641 | Imai, Chisato (1499) | Won 2-0 | +211386 |
| top | average opponent: 1491record: 5-4 | new rating: 1386 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1431 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 830 | Nihei, Shougo (1501) | Lost 1-2 | -171414 |
| 2standard | 1109 | Mizuno, Akimitsu (1189) | Lost 1-2 | -221392 |
| 3standard | 1556 | Shibuya, Yoshio (1437) | Won 2-0 | +191411 |
| 4standard | 1130 | Fujita, Gensho (1489) | Won 2-0 | +191430 |
| 5standard | 790 | Dai, XiaoChen (1431) | Lost 0-2 | -181412 |
| 6standard | 1270 | Hashikami, Taisuke (1477) | Lost 1-2 | -171395 |
| 7standard | 1193 | Kawai, Yusuke (1499) | Lost 1-2 | -161379 |
| 8standard | 1068 | Fukuda, Kouta (1445) | Lost 0-2 | -161363 |
| 9standard | 894 | Tanaka, Akiho (1392) | Lost 1-2 | -181345 |
| top | average opponent: 1429record: 2-7 | new rating: 1345 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1435 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 603 | Kagami, Takuya (1511) | Lost 0-2 | -161419 |
| 2sealed | 771 | Fujiwara, Ryuki (1546) | Lost 0-2 | -161403 |
| 3sealed | 1138 | Ihara, Keita (1411) | Won 2-0 | +181421 |
| 4sealed | 1011 | Terauchi, Takayuki (1482) | Won 2-1 | +191440 |
| 5sealed | 628 | Morimoto, Asataka (1531) | Won 2-0 | +201460 |
| 6sealed | 653 | Hata, Hirotaka (1625) | Won 2-0 | +211481 |
| 7sealed | 407 | Shibata, Yuuya (1544) | Lost 1-2 | -171464 |
| 8sealed | 474 | Moriya, Erika (1495) | Lost 1-2 | -181446 |
| 9sealed | 608 | Satou, Takahisa (1571) | Lost 0-2 | -151431 |
| top | average opponent: 1524record: 4-5 | new rating: 1431 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1471 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 151 | Horibe, Satoshi (1444) | Lost 0-2 | -181453 |
| 4sealed | 165 | Soeda, Kohei (1487) | Lost 0-2 | -181435 |
| top | average opponent: 1466record: 0-2 | new rating: 1435 | ||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 371 | Yagyu, Naoya (1500) | Won 2-0 | +191500 |
| 2sealed | 197 | Kanazawa, Shuu (1546) | Lost 0-2 | -181482 |
| 3sealed | 400 | Hayashi, Shinsuke (1859) | Lost 0-2 | -111471 |
| top | average opponent: 1635record: 1-2 | new rating: 1471 | ||
| Grand Prix Kobe 2014 (modern) | starting rating: 1498 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 702 | Nakata, Tatsuya (1567) | Lost 0-2 | -161482 |
| 2modern | 1127 | Watanabe, Masahito (1482) | Won 2-0 | +181500 |
| 3modern | 1044 | Ueta, Kazuaki (1501) | Won 2-0 | +181518 |
| 4modern | 916 | Matsuda, Yoshiaki (1499) | Won 2-1 | +171535 |
| 5modern | 873 | Yabuta, Junichi (1669) | Lost 1-2 | -151520 |
| 6modern | 960 | Yoshimoto, Masashi (1520) | Lost 1-2 | -181502 |
| 7modern | 941 | Inoue, Yuusuke (1585) | Lost 1-2 | -171485 |
| 8modern | 941 | Kamei, Hidenori (1382) | Lost 0-2 | -201465 |
| 9modern | 943 | Fujiwara, Kazuto (1353) | Won 2-0 | +161481 |
| top | average opponent: 1507record: 4-5 | new rating: 1481 | ||
| Grand Prix Nagoya 2014 (BNG limited) | starting rating: 1516 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 768 | Ishii, Masashi (1428) | Draw 1-1 | -21514 |
| 2sealed | 715 | Mashima, Mitsuharu (1722) | Lost 1-2 | -141500 |
| 3sealed | 859 | Futakami, Maika (1482) | Won 2-0 | +181518 |
| 4sealed | 787 | Nakamura, Kimikazu (1441) | Lost 0-2 | -201498 |
| top | average opponent: 1518record: 1-2-1 | new rating: 1498 | ||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 959 | Watanabe, Tetsuo (1411) | Won 2-0 | +161516 |
| 2sealed | 669 | Minagawa, Daisuke (1544) | Lost 0-2 | -171499 |
| 3sealed | 886 | Matsuda, Kenji (1463) | Won 2-0 | +171516 |
| 4sealed | 894 | Ueda, Shota (1517) | Won 2-1 | +181534 |
| 5sealed | 877 | Nakazono, Kouya (1516) | Lost 1-2 | -181516 |
| top | average opponent: 1490record: 3-2 | new rating: 1516 | ||