Koga, Toshimitsu
Current rating: 1659
Record: 30-20-2
| Grand Prix Shizuoka 2018 (standard) (GRN standard) | starting rating: 1654 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 603 | Baba, Fumitaka (1430) | Won 2-1 | +141668 |
| 2standard | 582 | Yamaguchi, Yuuichi (1661) | Won 2-0 | +181686 |
| 3standard | 392 | Mizutani, Yosuke (1798) | Lost 0-2 | -161670 |
| 4standard | 514 | Hasegawa, Atusi (1390) | Won 2-1 | +131683 |
| 5standard | 300 | Matsuda, Hideyuki (1567) | Lost 0-2 | -201663 |
| 6standard | 700 | Seki, Kentaro (1663) | Won 2-1 | +181681 |
| 7standard | 568 | Yoshida, Kenji (1452) | Lost 0-2 | -221659 |
| top | average opponent: 1566record: 4-3 | new rating: 1659 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1710 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 554 | Hotta, Kei (1601) | Won 2-1 | +161726 |
| 2modern | 203 | Nakamura, Yuta (1494) | Won 2-0 | +141740 |
| 3modern | 107 | Takahashi, Tetsuhiro (1641) | Lost 0-2 | -201720 |
| 4modern | 897 | Katou, Takeru (1372) | Lost 1-2 | -241696 |
| 5modern | 726 | Horibe, Kenji (1619) | Lost 1-2 | -201676 |
| 6modern | 906 | Hashimoto, Satoshi (1453) | Lost 0-2 | -221654 |
| top | average opponent: 1530record: 2-4 | new rating: 1654 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1632 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 246 | Tanaka, Masami (1467) | Won 2-0 | +151647 |
| 2standard | 175 | Yamakita, Yuya (1604) | Won 2-1 | +171664 |
| 3standard | 88 | Kozakai, Yukio (1628) | Won 2-1 | +171681 |
| 4standard | 178 | Yoshizawa, Yutaka (1560) | Won 2-0 | +161697 |
| 5standard | 56 | Satou, Naoki7909 (1544) | Won 2-0 | +151712 |
| 6standard | 38 | Nukita, Yosuke (1561) | Won 2-0 | +151727 |
| 7standard | 33 | Sun, Chuan (1867) | Lost 1-2 | -151712 |
| 8standard | 59 | Nogami, Tokio (1562) | Lost 1-2 | -211691 |
| 9standard | 201 | Hasebe, Hironobu (1577) | Won 2-1 | +161707 |
| 10standard | 56 | Tsukagoshi, Tadaki (1780) | Won 2-0 | +201727 |
| 11standard | 30 | Harane, Kenta (1951) | Lost 0-2 | -141713 |
| 12standard | 199 | Kawai, Yusuke (1590) | Won 2-0 | +151728 |
| 13standard | 84 | Yohara, Tosho (1679) | Won 2-0 | +171745 |
| 14standard | 30 | Ito, Masahiro (1718) | Lost 1-2 | -181727 |
| 15standard | 87 | Kobayashi, Kazutaka (1770) | Lost 1-2 | -171710 |
| top | average opponent: 1657record: 10-5 | new rating: 1710 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1468 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 442 | Yutaka, Ryohei (1762) | Won 2-0 | +231491 |
| 2standard | 694 | Gaieski, Ethan (1533) | Lost 0-2 | -171474 |
| 3standard | 1119 | Senba, Fuyuki (1502) | Won 2-1 | +181492 |
| 4standard | 500 | Taya, Hironobu (1457) | Lost 1-2 | -181474 |
| 5standard | 841 | Toyoda, Ryosuke (1419) | Won 2-0 | +171491 |
| 6standard | 626 | Kurakami, Shun (1621) | Won 2-0 | +201511 |
| 7standard | 477 | Katayanagi, Shigehisa (1526) | Won 2-1 | +181529 |
| 8standard | 424 | Kajiya, Tatsuki (1541) | Won 2-1 | +191548 |
| 9standard | 118 | Yukuhiro, Ken (1935) | Lost 1-2 | -121536 |
| 10standard | 255 | Nose, Kouta (1576) | Won 2-0 | +191555 |
| 11standard | 262 | Tsuchida, Shinnosuke (1571) | Won 2-0 | +181573 |
| 12standard | 151 | Nitta, Ryou (1661) | Won 2-0 | +201593 |
| 13standard | 121 | Takeda, Yoshihide (1567) | Won 2-0 | +171610 |
| 14standard | 82 | Hosokawa, Yuya (1784) | Won 2-0 | +221632 |
| 15standard | 51 | Asahara, Akira (1988) | ID | 01632 |
| top | average opponent: 1630record: 11-3-1 | new rating: 1632 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 270 | Kang, Songyong (1483) | Won 2-1 | +181483 |
| 2sealed | 550 | Takakuwa, Akihiro (1635) | Lost 1-2 | -151468 |
| top | average opponent: 1559record: 1-1 | new rating: 1468 | ||
| Grand Prix Kobe 2015 (BFZ standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 441 | Pang, Zhong Chern (1502) | Won 2-0 | +181518 |
| 2standard | 5 | Hanano, Koji (1517) | Lost 1-2 | -181500 |
| 3standard | 771 | Yamamoto, Yuhei (1503) | Lost 0-2 | -181482 |
| 4standard | 1075 | Arase, Kousuke (1481) | Lost 1-2 | -181464 |
| 5standard | 1016 | Hamada, Akira (1547) | Draw 1-1 | +21466 |
| 6standard | 922 | Kikuchi, Takashi (1396) | Won 2-1 | +161482 |
| 7standard | 738 | Shibano, Yuki (1486) | Draw 1-1 | 01482 |
| 8standard | 650 | Asai, Hiroto (1501) | Lost 1-2 | -171465 |
| top | average opponent: 1492record: 2-4-2 | new rating: 1465 | ||