Ishihara, Koji
Current rating: 1574
Record: 53-48 (GP) / 1-4 (professional)
| Players Tour Nagoya 2020 (pioneer) | starting rating: 1621 | |||
| round | table | opponent (rating) | result | Δrating |
| 1draft | 60 | Bai, Hualin (1763) | Lost 0-2 | -161605 |
| 2draft | 21 | John, Julian (1783) | Lost 0-2 | -141591 |
| 3draft | 78 | Fujiwara, Mizuki (1602) | Won 2-1 | +181609 |
| 4pioneer | 60 | Fung, Chun Sing (1763) | Lost 0-2 | -151594 |
| 5pioneer | 79 | Choi, Minsu (1519) | Lost 0-2 | -201574 |
| top | average opponent: 1686record: 1-4 | new rating: 1574 | ||
| Grand Prix Nagoya 2019 (ELD standard) | starting rating: 1594 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 291 | Kishi, Daiko (1492) | Won 2-1 | +161610 |
| 4standard | 219 | Yoshida, Yutarou (1567) | Lost 0-2 | -191591 |
| 5standard | 219 | Suganuma, Kathuhiro (1395) | Won 2-0 | +151606 |
| 6standard | 219 | Goryo, Akira (1675) | Won 2-1 | +191625 |
| 7standard | 108 | Sugiyama, Yuu (1760) | Won 2-0 | +211646 |
| 8standard | 46 | Urasaki, Takayuki (1788) | Lost 1-2 | -161630 |
| 9standard | 124 | Ibushi, Shotaro (1597) | Won 2-1 | +171647 |
| 10standard | 81 | Inui, Takashi (1591) | Lost 1-2 | -191628 |
| 11standard | 117 | Koizumi, Yuma (1667) | Lost 1-2 | -171611 |
| 12standard | 114 | Hosokawa, Yuya (1965) | Lost 1-2 | -121599 |
| 13standard | 128 | Ikeda, Hiroaki (1688) | Won 2-1 | +201619 |
| 14standard | 116 | Ma, Noah (1819) | Lost 1-2 | -141605 |
| 15standard | 110 | Nakayama, Satoshi (1505) | Won 2-1 | +161621 |
| top | average opponent: 1654record: 7-6 | new rating: 1621 | ||
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1590 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 29 | De Rosa, Antonino (2100) | Won 2-0 | +261616 |
| 4sealed | 59 | Izumi, Keita (1556) | Lost 0-2 | -191597 |
| 5sealed | 435 | Sakamoto, Akihito (1533) | Lost 0-2 | -191578 |
| 6sealed | 534 | Nakayama, Munetoshi (1428) | Won 2-1 | +151593 |
| 7sealed | 436 | Suzuki, Yuta 8270 (1500) | Won 2-0 | +171610 |
| 8sealed | 323 | Nakai, Yutaka (1741) | Lost 1-2 | -161594 |
| top | average opponent: 1643record: 3-3 | new rating: 1594 | ||
| Grand Prix Yokohama 2019 (modern) | starting rating: 1575 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 202 | Nagata, Satoshi (1485) | Won 2-1 | +161591 |
| 4modern | 215 | Suzuki, Akira3942 (1571) | Won 2-0 | +181609 |
| 5modern | 34 | Takano, Kodai (1717) | Lost 1-2 | -161593 |
| 6modern | 133 | Shibue, Takahiro (1296) | Won 2-0 | +121605 |
| 7modern | 152 | Takaya, Akio (1546) | Won 2-0 | +171622 |
| 8modern | 22 | Watanabe, Maki (1646) | Won 2-0 | +191641 |
| 9modern | 29 | Kondo, Shogo (1661) | Lost 1-2 | -181623 |
| 10modern | 103 | Seo, Kenta (1638) | Lost 1-2 | -181605 |
| 11modern | 138 | Nakano, Akinori (1656) | Lost 1-2 | -171588 |
| 12modern | 156 | Suzuki, Kazuto (1561) | Won 2-1 | +181606 |
| 13modern | 135 | Oda, Hideto (1639) | Lost 1-2 | -181588 |
| 14modern | 166 | Arai, Shogo (1674) | Lost 1-2 | -161572 |
| 15modern | 149 | Izumisawa, Ryo (1562) | Won 2-1 | +181590 |
| top | average opponent: 1589record: 7-6 | new rating: 1590 | ||
| Grand Prix Kyoto 2019 (RNA standard) | starting rating: 1582 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 364 | Danjo, Hiroyuki (1459) | Won 2-0 | +161598 |
| 4standard | 248 | Ataka, Kazuma (1552) | Lost 0-2 | -191579 |
| 5standard | 273 | Tsujimoto, Shingo (1498) | Won 2-0 | +171596 |
| 6standard | 81 | Hoshino, Tomoyuki (1558) | Won 2-0 | +171613 |
| 7standard | 61 | Aizawa, Tamotsu (1547) | Lost 1-2 | -191594 |
| 8standard | 246 | Yamaguchi, Takuya (1518) | Lost 1-2 | -191575 |
| top | average opponent: 1522record: 3-3 | new rating: 1575 | ||
| Grand Prix Shizuoka 2018 (standard) (GRN standard) | starting rating: 1626 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 512 | Ishino, Takuya (1440) | Lost 1-2 | -221604 |
| 4standard | 424 | Ozawa, Kensuke (1521) | Won 2-1 | +171621 |
| 5standard | 395 | Matsuura, Gen (1467) | Lost 0-2 | -211600 |
| 6standard | 683 | Nishimoto, Takuya (1629) | Lost 1-2 | -181582 |
| top | average opponent: 1514record: 1-3 | new rating: 1582 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1556 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 264 | Tsutsumi, Yukihiro (1467) | Won 2-1 | +161572 |
| 4sealed | 153 | Takahashi, Yuto (1661) | Won 2-0 | +201592 |
| 5sealed | 76 | Kiyonaga, Sho (1590) | Won 2-0 | +181610 |
| 6sealed | 48 | Maki, Ryosuke (1579) | Won 2-0 | +171627 |
| 7sealed | 9 | Nanba, Naoya (1772) | Lost 0-2 | -151612 |
| 8sealed | 105 | Saeki, Katsuhisa (1810) | Lost 0-2 | -151597 |
| 9sealed | 151 | Shiraishi, Makoto (1595) | Lost 1-2 | -181579 |
| 10draft | 635 | Nobukiyo, Yasuaki (1585) | Won 2-0 | +181597 |
| 11draft | 580 | Hasebe, Shunichi (1665) | Won 2-1 | +201617 |
| 12draft | 632 | Kamo, Riki (1772) | Won 2-1 | +201637 |
| 13draft | 693 | Takano, Hayato (1613) | Lost 1-2 | -181619 |
| 14draft | 709 | Horiuchi, Makoto (1788) | Won 2-0 | +211640 |
| 15draft | 555 | Murakami, Yuki (1836) | Lost 0-2 | -141626 |
| top | average opponent: 1672record: 8-5 | new rating: 1626 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1606 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 504 | Nose, Koji (1791) | Won 2-0 | +221628 |
| 4sealed | 98 | Miyata, Haruka (1592) | Lost 0-2 | -191609 |
| 5sealed | 394 | Kyo, Ifu (1641) | Lost 0-2 | -171592 |
| 6sealed | 579 | Mituyasu, Yuki (1560) | Lost 0-2 | -191573 |
| 7sealed | 579 | Yoshimura, Genki (1611) | Lost 0-2 | -171556 |
| top | average opponent: 1639record: 1-4 | new rating: 1556 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1572 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 618 | Siagian, Yohannes (1398) | Won 2-1 | +151587 |
| 4modern | 65 | Nagae, Nobuyasu (1530) | Won 2-0 | +171604 |
| 5modern | 134 | Kojima, Tatuya (1759) | Won 2-0 | +211625 |
| 6modern | 8 | Chiba, Akio (2041) | Lost 0-2 | -111614 |
| 7modern | 131 | Kuo, Tzu-Ching (1865) | Won 2-1 | +221636 |
| 8modern | 135 | Saitou, Ryuuga (1987) | Won 2-1 | +251661 |
| 9modern | 56 | Matsui, Hisataka (1813) | Lost 0-2 | -161645 |
| 10modern | 97 | Ichikawa, Norikazu (1668) | Lost 1-2 | -171628 |
| 11modern | 129 | Nagata, Satoshi (1435) | Lost 0-2 | -221606 |
| top | average opponent: 1722record: 5-4 | new rating: 1606 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1578 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 47 | Yamada, Mitsuhiro (1521) | Lost 1-2 | -191559 |
| 3standard | 996 | Mihashi, Takanobu (1540) | Won 2-0 | +181577 |
| 4standard | 493 | Obitsu, Kimihiko (1528) | Lost 0-2 | -191558 |
| 5standard | 964 | Sotarou, Wada (1482) | Lost 1-2 | -191539 |
| 6standard | 979 | Ishida, Ryouhei (1554) | Won 2-1 | +181557 |
| 7standard | 918 | Houjo, Chihiro (1383) | Won 2-0 | +151572 |
| 8standard | 708 | Daizo, Motoe (1525) | Won 2-1 | +171589 |
| 9standard | 385 | Oohashi, Keisuke (1647) | Lost 0-2 | -171572 |
| top | average opponent: 1523record: 4-4 | new rating: 1572 | ||
| Grand Prix Chiba 2016 (legacy) | starting rating: 1532 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 24 | Tateishi, Yutarou (1517) | Won 2-0 | +171549 |
| 2legacy | 404 | Nishida, Wataru (1506) | Won 2-0 | +181567 |
| 3legacy | 368 | Kobayasi, Tomoya (1549) | Won 2-1 | +171584 |
| 4legacy | 114 | Nagai, Mamoru (1701) | Lost 0-1 | -161568 |
| 5legacy | 238 | Kajitani, Akinobu (1616) | Lost 1-2 | -171551 |
| 6legacy | 606 | Koike, Katsutoshi (1457) | Lost 0-2 | -191532 |
| 7legacy | 601 | Tsuruoka, Hiroaki (1556) | Won 2-0 | +181550 |
| 8legacy | 440 | Kisa, Takakazu (1526) | Won 2-0 | +181568 |
| 9legacy | 319 | Flck Elck, Takumi (1541) | Won 2-1 | +171585 |
| 10legacy | 330 | Yoshino, Takaaki (1503) | Lost 0-2 | -191566 |
| 11legacy | 325 | Kitamura, Gaku (1476) | Lost 0-2 | -201546 |
| 12legacy | 323 | Mizoguchi, Satoru (1453) | Lost 0-2 | -201526 |
| 13legacy | 306 | Hamachiyo, Takahiro (1483) | Won 2-1 | +171543 |
| 14legacy | 280 | Nishimura, Masami (1533) | Won 2-0 | +181561 |
| 15legacy | 253 | Sano, Kouki (1518) | Won 2-0 | +171578 |
| top | average opponent: 1529record: 9-6 | new rating: 1578 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 745 | Muronoi, Shin (1500) | Won 2-0 | +181518 |
| 2sealed | 199 | Fujita, Osamu (1783) | Lost 0-2 | -131505 |
| 3sealed | 974 | Terauchi, Takayuki (1500) | Won 2-1 | +181523 |
| 4sealed | 489 | Fujii, Daisuke (1625) | Lost 1-2 | -161507 |
| 5sealed | 653 | Minoshima, Daijiro (1497) | Won 2-0 | +171524 |
| 6sealed | 613 | Murata, Ryousuke (1603) | Lost 0-2 | -161508 |
| 7sealed | 768 | Kasuga, Ryosuke (1816) | Won 2-1 | +231531 |
| 8sealed | 515 | Mitsuyasu, Hidetoshi (1546) | Won 2-1 | +181549 |
| 9sealed | 405 | Masuda, Jyunya (1560) | Lost 0-2 | -171532 |
| top | average opponent: 1603record: 5-4 | new rating: 1532 | ||