Koshiba, Norihiko
Current rating: 1449
Record: 85-90-3
- 2004
- 2005
- 2006
- 2007
- 2008
- 2009
- 2011
- 2012
- 2013
- 2014
- 2015
- 2016
- 2017
- 2018
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1470 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 760 | Ogino, Genki (1394) | Lost 0-2 | -191451 |
| 2sealed | 769 | Kubo, Hirotaka (1522) | Lost 1-2 | -171434 |
| 3sealed | 1051 | Huang, Mu Kai (1415) | Won 2-0 | +181452 |
| 4sealed | 834 | Itazu, Boram (1343) | Won 2-1 | +161468 |
| 5sealed | 833 | Chen, Ting-FANG (1420) | Lost 0-2 | -191449 |
| top | average opponent: 1419record: 2-3 | new rating: 1449 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1393 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 10 | Sugiura, Toshitaka (1521) | Won 2-0 | +201413 |
| 2sealed | 270 | Matsubara, Yuuichi (1564) | Lost 1-2 | -151398 |
| 3sealed | 923 | Morimoto, Kiho (1501) | Won 2-0 | +201418 |
| 4sealed | 410 | Ogawa, Daiki (1507) | Won 2-1 | +201438 |
| 5sealed | 449 | Uotsu, Atsushi (1433) | Lost 0-2 | -191419 |
| 6sealed | 418 | Hamasaki, Masayuki (1530) | Lost 1-2 | -161403 |
| 7sealed | 567 | Futada, Takahiro (1532) | Won 2-0 | +211424 |
| 8sealed | 567 | Uno, Yuki (1557) | Won 2-0 | +201444 |
| 9sealed | 348 | Shimada, Katsuhiro (1503) | Won 2-0 | +191463 |
| 10draft | 371 | Matsumura, Hideaki (1533) | Lost 1-2 | -161447 |
| 11draft | 87 | Akasaka, Yasuyuki (1513) | Won 2-0 | +191466 |
| 12draft | 216 | Sakumoto, Kazuki (1561) | Won 2-0 | +191485 |
| 13draft | 137 | Imanishi, Eiji (1652) | Lost 1-2 | -151470 |
| top | average opponent: 1531record: 8-5 | new rating: 1470 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1469 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 395 | Choi, Minseok (1500) | Lost 1-2 | -171452 |
| 4standard | 473 | Nagafuchi, Ei (1500) | Lost 1-2 | -181434 |
| 5standard | 734 | Shibata, Yuuya (1547) | Won 2-1 | +201454 |
| 6standard | 790 | Takato, Toshiyuki (1558) | Lost 1-2 | -161438 |
| 7standard | 780 | Yokoi, Masaki (1632) | Lost 0-2 | -141424 |
| 8standard | 848 | Nakamura, Satoshi0186 (1567) | Lost 0-2 | -161408 |
| 9standard | 805 | Shimamura, Yukihiro (1547) | Lost 1-2 | -151393 |
| top | average opponent: 1550record: 1-6 | new rating: 1393 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 308 | Fujimoto, Daiki (1500) | Lost 1-2 | -171448 |
| 2standard | 1204 | Ikai, Daiki (1481) | Won 2-0 | +191467 |
| 3standard | 1061 | Hanada, Keisuke (1533) | Won 2-1 | +191486 |
| 4standard | 640 | Nishikawa, Yukihide (1516) | Won 2-0 | +181504 |
| 5standard | 555 | Miyazaki, Yuudai (1501) | Lost 1-2 | -181486 |
| 6standard | 839 | Tomizawa, Youhei (1497) | Lost 0-2 | -181468 |
| 7standard | 808 | Shimamura, Kazushige (1466) | Won 2-1 | +181486 |
| 8standard | 849 | Watabe, Jun (1516) | Lost 1-2 | -171469 |
| top | average opponent: 1501record: 4-4 | new rating: 1469 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1450 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 333 | Murakami, Yuuichi (1504) | Lost 0-2 | -171433 |
| 2sealed | 678 | Koyama, Kenta (1762) | Lost 1-2 | -131420 |
| 3sealed | 1158 | Sakurai, Yuuta (1472) | Won 2-0 | +191439 |
| 4sealed | 1101 | Oomori, Shouhei (1482) | Lost 0-2 | -171422 |
| 5sealed | 1093 | Kobayashi, Keitaro (1432) | Won 2-1 | +181440 |
| 6sealed | 900 | Lee, Rick Hup Beng (1765) | Won 2-0 | +241464 |
| 7sealed | 850 | Kobayashi, Kazutaka (1502) | Won 2-1 | +191483 |
| 8sealed | 672 | Tsuchihashi, Takuya (1517) | Lost 1-2 | -181465 |
| top | average opponent: 1555record: 4-4 | new rating: 1465 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 143 | Myjat, Ljuga (1500) | Won 2-0 | +181482 |
| 2sealed | 15 | Nunotani, Kousuke (1516) | Lost 1-2 | -171465 |
| 3sealed | 295 | Kobayashi, Kazutaka (1501) | Lost 1-2 | -181447 |
| 4sealed | 444 | Ogura, Takamasa (1574) | Won 2-0 | +211468 |
| 5sealed | 309 | Kawabata, Yuu (1452) | Won 2-1 | +171485 |
| 6sealed | 248 | Ikeda, Ippei (1483) | Lost 0-2 | -181467 |
| 7sealed | 285 | Igarashi, Takuma (1481) | Lost 0-2 | -171450 |
| top | average opponent: 1501record: 3-4 | new rating: 1450 | ||
| Grand Prix Kyoto 2015 (legacy) | starting rating: 1515 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 263 | Kudou, Shintarou (1500) | Lost 1-2 | -181497 |
| 2legacy | 270 | Oldziey, Kalim (1728) | Lost 0-2 | -141483 |
| 3legacy | 438 | Tasugi, Keigo (1397) | Lost 0-2 | -191464 |
| top | average opponent: 1542record: 0-3 | new rating: 1464 | ||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1577 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 915 | Moriai, Kozue (1532) | Lost 1-2 | -191558 |
| 2sealed | 925 | Yamaguchi, Hiroshi9054 (1466) | Lost 1-2 | -201538 |
| 3sealed | 1069 | Ichikawa, Kenichi (1465) | Lost 0-2 | -191519 |
| 4sealed | 1100 | Makigano, Motohiro (1444) | Won 2-1 | +161535 |
| 5sealed | 1034 | Shiraishi, Shinji (1417) | Lost 0-2 | -201515 |
| top | average opponent: 1465record: 1-4 | new rating: 1515 | ||
| Grand Prix Nagoya 2014 (BNG limited) | starting rating: 1534 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 726 | Shirakawa, Yuhei (1500) | Won 2-0 | +171551 |
| 2sealed | 619 | Kitamoto, Hiroki (1687) | Lost 1-2 | -161535 |
| 3sealed | 814 | Yamagami, Yudai (1562) | Won 2-1 | +191554 |
| 4sealed | 740 | Takagi, Hiroki (1464) | Won 2-0 | +161570 |
| 5sealed | 609 | Matushita, Masakazu (1540) | Won 2-1 | +181588 |
| 6sealed | 595 | Ito, Keigo (1618) | Lost 0-2 | -181570 |
| 7sealed | 617 | Ootsuka, Koutarou (1838) | Won 2-1 | +231593 |
| 8sealed | 606 | Hassaku, Jinpei (1676) | Lost 1-2 | -161577 |
| top | average opponent: 1611record: 5-3 | new rating: 1577 | ||
| Grand Prix Shizuoka 2013 (THS standard) | starting rating: 1557 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 236 | Hasegawa, Tsuguto (1446) | Lost 0-2 | -211536 |
| 2standard | 317 | Katou, Kotarou (1498) | Lost 0-2 | -181518 |
| 3standard | 419 | Kimura, Isao (1395) | Won 2-1 | +161534 |
| 4standard | 340 | Li, Zhexi (1479) | Won 2-1 | +171551 |
| 5standard | 258 | Murae, Ryuji (1724) | Lost 0-2 | -151536 |
| 6standard | 282 | Shirai, Yuusuke (1470) | Won 2-1 | +171553 |
| 7standard | 249 | Maeda, Gaku (1498) | Lost 1-2 | -191534 |
| top | average opponent: 1502record: 3-4 | new rating: 1534 | ||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1511 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 309 | Ngan, Wing Ming (1420) | Won 2-0 | +161527 |
| 2sealed | 202 | Yoshizumi, Satoshi (1518) | Won 2-0 | +181545 |
| 3sealed | 38 | Okamoto, Yuuma (1583) | Won 2-1 | +191564 |
| 4sealed | 68 | Nakanishi, Yutaka (1504) | Won 2-1 | +171581 |
| 5sealed | 12 | Nakai, Sunao (1479) | Won 2-0 | +161597 |
| 6sealed | 1 | Tamai, Yuno (1506) | Lost 1-2 | -201577 |
| 7sealed | 76 | Toriuchi, Daizo (1564) | Lost 1-2 | -181559 |
| 8sealed | 221 | Okada, Kou (1550) | Won 2-1 | +181577 |
| 9sealed | 242 | Takahashi, Ryou (1459) | Lost 1-2 | -201557 |
| top | average opponent: 1509record: 6-3 | new rating: 1557 | ||
| Grand Prix Yokohama 2012 (modern) | starting rating: 1550 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 90 | Kitabayashi, Takashi (1587) | Draw 1-1 | +11551 |
| 3modern | 277 | Yonekura, Takumi (1518) | Lost 1-2 | -191532 |
| 4modern | 469 | Abe, Tooru (1471) | Draw 1-1 | -11531 |
| 5modern | 562 | Matsunami, Shohei (1498) | Lost 1-2 | -191512 |
| 6modern | 548 | Hatai, Eiichirou (1464) | Won 2-0 | +171529 |
| 7modern | 419 | Kato, Ryuta (1498) | Lost 1-2 | -181511 |
| top | average opponent: 1506record: 1-3-2 | new rating: 1511 | ||
| Grand Prix Kobe 2012 (DKA limited) | starting rating: 1593 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 149 | Yuusuke I, (1500) | Won 2-1 | +161609 |
| 2sealed | 174 | Chan, Carlson Kar Fatt (1536) | Lost 1-2 | -191590 |
| 3sealed | 367 | Kubomi, Yusuke (1457) | Lost 1-2 | -211569 |
| 4sealed | 483 | Okamoto, Teppei (1480) | Lost 1-2 | -191550 |
| top | average opponent: 1493record: 1-3 | new rating: 1550 | ||
| Grand Prix Kobe 2011 (extended) | starting rating: 1576 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 197 | Saitou, Daisuke (1446) | Won 2-0 | +161592 |
| 2extended | 78 | Kubouchi, Naoki (1743) | Lost 0-2 | -151577 |
| 3extended | 186 | Saitou, Eiji (1542) | Won 2-1 | +171594 |
| 4extended | 151 | N., Ryo (1517) | Won 2-1 | +161610 |
| 5extended | 134 | Yanagizawa, Kazutoyo (1388) | Won 2-0 | +141624 |
| 6extended | 48 | Shiozu, Ryouma (1864) | Lost 1-2 | -131611 |
| 7extended | 137 | Okada, Takuya (1618) | Lost 0-2 | -181593 |
| top | average opponent: 1588record: 4-3 | new rating: 1593 | ||
| Grand Prix Kitakyushu 2009 (ZEN limited) | starting rating: 1497 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 24 | Shitakubo, Hiroyuki (1500) | Lost 1-2 | -181479 |
| 2sealed | 133 | Takahashi, Ryou (1396) | Won 2-0 | +171496 |
| 3sealed | 106 | Uesugi, Fumiya (1474) | Won 2-0 | +171513 |
| 4sealed | 145 | Imura, Satoshi (1637) | Lost 0-2 | -151498 |
| 5sealed | 146 | Mukuno, Yuuji (1681) | Won 2-0 | +211519 |
| 6sealed | 146 | Matsumoto, Hiroshi (1568) | Won 2-1 | +191538 |
| 7sealed | 101 | Wang, Ming Chee (1665) | Won 2-0 | +201558 |
| 8sealed | 50 | Saito, Takaya (1719) | Won 2-0 | +211579 |
| 9draft | 23 | Suzuki, Ryuuichi (1445) | Won 2-1 | +161595 |
| 10draft | 39 | Furutate, Mikihiko (1545) | Won 2-1 | +171612 |
| 11draft | 15 | Moriya, Jun (1733) | Lost 1-2 | -161596 |
| 12draft | 17 | Sugita, Toshihiko (1545) | Won 2-0 | +171613 |
| 13draft | 12 | Nitta, Kazuta (1596) | Lost 1-2 | -181595 |
| 14draft | 16 | Miyaoka, Hiroyuki (1568) | Lost 1-2 | -191576 |
| top | average opponent: 1577record: 9-5 | new rating: 1576 | ||
| Grand Prix Niigata 2009 (M10 limited) | starting rating: 1538 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 198 | Furujou, Takashi (1432) | Lost 0-2 | -201518 |
| 2sealed | 238 | Yoshizawa, Takuya (1500) | Lost 0-2 | -191499 |
| 3sealed | 291 | Takahashi, Tsutomu (1464) | Won 2-0 | +181517 |
| 4sealed | 280 | Takami, Yuuta (1432) | Lost 0-2 | -201497 |
| top | average opponent: 1457record: 1-3 | new rating: 1497 | ||
| Grand Prix Kobe 2009 (extended) | starting rating: 1536 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 156 | Yamano, Tomoya (1687) | Won 2-1 | +201556 |
| 2extended | 102 | Oonishi, Tatsuya (1458) | Won 2-0 | +171573 |
| 3extended | 53 | Chiba, Akio (1610) | Lost 0-2 | -181555 |
| 4extended | 114 | Motoyama, Kazuhiko (1646) | Lost 1-2 | -161539 |
| 5extended | 202 | Prananta, Nico (1499) | Won 2-1 | +171556 |
| 6extended | 136 | Kanemura, Akihiko (1524) | Lost 0-2 | -181538 |
| top | average opponent: 1571record: 3-3 | new rating: 1538 | ||
| Grand Prix Okayama 2008 (ALA limited) | starting rating: 1493 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 200 | Tanaka, Atsushi (1627) | Won 0-0 | +201513 |
| 2sealed | 70 | Yokoi, Masaki (1745) | Won 2-1 | +221535 |
| 3sealed | 64 | Takahashi, Jun ya (1603) | Lost 0-2 | -171518 |
| 4sealed | 112 | Ootsuka, Junki (1471) | Won 2-0 | +181536 |
| 5sealed | 90 | Yoshinaga, Mitsuteru (1566) | Won 2-1 | +181554 |
| 6sealed | 24 | Fukuta, Shingo (1521) | Lost 0-2 | -181536 |
| top | average opponent: 1589record: 4-2 | new rating: 1536 | ||
| Grand Prix Shizuoka 2008 (MOR standard) | starting rating: 1511 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 14 | Harada, Daisaku (1621) | Won 2-1 | +201531 |
| 2standard | 4 | Ohige, Tatsuya (1484) | Lost 0-2 | -191512 |
| 3standard | 203 | Abe, Ken'Ichi (1481) | Lost 0-2 | -181494 |
| 4standard | 314 | Sugawara, Hajime (1484) | Won 2-1 | +171511 |
| 5standard | 244 | Fuji, Yuusuke (1472) | Lost 0-2 | -181493 |
| top | average opponent: 1508record: 2-3 | new rating: 1493 | ||
| Grand Prix Kitakyushu 2007 (LRW limited) | starting rating: 1508 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 6 | Hayashi, Nobuyoshi (1517) | Lost 1-2 | -181490 |
| 2sealed | 118 | Shiraishi, Kenji (1443) | Won 2-0 | +171507 |
| 3sealed | 109 | Baba, Yasunori (1646) | Won 2-0 | +201527 |
| 4sealed | 110 | Murakami, Norichika (1678) | Won 2-1 | +211548 |
| 5sealed | 56 | Aoyama, Katsuhiko (1539) | Lost 0-2 | -181530 |
| 6sealed | 75 | Takebayashi, Tomo (1472) | Lost 0-2 | -191511 |
| top | average opponent: 1549record: 3-3 | new rating: 1511 | ||
| Grand Prix Kyoto 2007 (PLC standard) | starting rating: 1528 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 157 | Yoshida, Ryuu (1464) | Won 2-0 | +171545 |
| 2standard | 96 | Sugimoto, Masayuki (1484) | Won 2-0 | +171562 |
| 3standard | 1 | Takahashi, Yuta (1652) | Lost 1-2 | -161546 |
| 4standard | 205 | Matsumoto, Masataka (1523) | Lost 1-2 | -191527 |
| 5standard | 221 | Kumano, Haruyasu (1499) | Won 2-0 | +181545 |
| 6standard | 218 | Okamura, Hideki (1538) | Lost 0-2 | -181527 |
| 7standard | 183 | Minoue, Hiroyuki (1515) | Lost 0-2 | -191508 |
| 8standard | 187 | Mito, Mitsukuni (1464) | Draw 1-1 | 01508 |
| top | average opponent: 1517record: 3-4-1 | new rating: 1508 | ||
| Grand Prix Hiroshima 2006 (CSP limited) | starting rating: 1533 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 116 | Ooyama, Masaya (1500) | Lost 0-2 | -191514 |
| 2sealed | 117 | Shindo, Yoshiya (1441) | Won 2-0 | +171531 |
| 3sealed | 107 | Nakazuka, Yuuki (1515) | Lost 1-2 | -191512 |
| 4sealed | 155 | Sugiura, Kiyohiro (1459) | Won 2-1 | +171529 |
| 5sealed | 107 | Nakano, Tomohito (1501) | Won 2-1 | +181547 |
| 6sealed | 86 | Takahashi, Jun ya (1504) | Lost 1-2 | -191528 |
| 7sealed | 109 | Kougo, Toshihide (1572) | Lost 1-2 | -171511 |
| 8sealed | 6 | Nakao, Munenari (1480) | Won 2-0 | +171528 |
| top | average opponent: 1496record: 4-4 | new rating: 1528 | ||
| Grand Prix Kitakyushu 2005 (extended) | starting rating: 1517 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 16 | Yamamoto, Takayuki (1436) | Won 2-0 | +161533 |
| 2extended | 57 | Nagaoka, Kazunori (1536) | Lost 1-2 | -181515 |
| 3extended | 50 | Kobayashi, Masanori (1582) | Lost 0-2 | -171498 |
| 4extended | 110 | Toshimi, Hirokazu (1442) | Won 2-0 | +171515 |
| 5extended | 84 | Sugama, Hideichi (1528) | Lost 1-2 | -171498 |
| 6extended | 88 | Yanagizawa, Kazutoyo (1448) | Won 2-0 | +171515 |
| 7extended | 75 | Kawate, Junpei (1503) | Won 2-1 | +181533 |
| top | average opponent: 1496record: 4-3 | new rating: 1533 | ||
| Grand Prix Yokohama 2004 (COK limited) | starting rating: 1478 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 124 | Matsushima, Kouji (1458) | Won 2-0 | +181496 |
| 2sealed | 130 | Yoshida, Tomoyuki (1517) | Lost 0-2 | -181478 |
| 3sealed | 233 | Takemura, Kazunori (1469) | Won 2-1 | +181496 |
| 4sealed | 115 | Onoda, Hikaru (1471) | Won 2-0 | +181514 |
| 5sealed | 128 | Taniguchi, Manabu (1512) | Lost 0-2 | -181496 |
| 6sealed | 153 | Aoki, Ryousuke (1530) | Won 2-0 | +181514 |
| 7sealed | 99 | Harada, Hiroaki (1520) | Won 2-0 | +181532 |
| 8sealed | 40 | Fuma, Masaharu (1661) | Lost 1-2 | -151517 |
| top | average opponent: 1517record: 5-3 | new rating: 1517 | ||
| Grand Prix Nagoya 2004 (5DN standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 16 | Miyazaki, Rintarou (1455) | Lost 1-2 | -191481 |
| 2standard | 290 | Mito, Takehiro (1484) | Won 2-1 | +181499 |
| 3standard | 271 | Tanaka, Takami (1500) | Lost 1-2 | -181481 |
| 4standard | 337 | Noguchi, Masami (1461) | Lost 1-2 | -181463 |
| 5standard | 390 | Nihashi, Yuuta (1434) | Lost 0-2 | -191444 |
| 6standard | 357 | Kawasumi, Kazuki (1446) | Won 2-0 | +181462 |
| 7standard | 275 | Wakae, Akio (1365) | Won 2-0 | +171479 |
| 8standard | 209 | Ikeda, Naoto (1460) | Won 2-0 | +171496 |
| 9standard | 164 | Inanaga, Nobuyuki (1496) | Lost 1-2 | -181478 |
| top | average opponent: 1456record: 4-5 | new rating: 1478 | ||