Matsumoto, Keiichiro
Current rating: 1557
Record: 39-42-1
| Regional Championships Aichi 2023 (pioneer) | starting rating: 1552 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 3 | Atsuji, Makoto (1541) | Lost 1-2 | -191533 |
| 2pioneer | 79 | Ogawa, Yusuke (1402) | Won 2-0 | +161549 |
| 3pioneer | 54 | Inoue, Toru (2099) | Lost 0-2 | -91540 |
| 4pioneer | 90 | Cho, Jae Seok (1592) | Won 2-1 | +191559 |
| 5pioneer | 41 | Kong, Sangjoon (1592) | Lost 0-2 | -171542 |
| 6pioneer | 74 | kamezaki, sho (1559) | Draw 1-1 | 01542 |
| 7pioneer | 65 | Tezuka, Yu (1346) | Won 2-1 | +151557 |
| top | average opponent: 1590record: 3-3-1 | new rating: 1557 | ||
| Regional Championships Chiba 2023 (pioneer) | starting rating: 1525 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 101 | Adachi, Ryosuke (1713) | Won 2-0 | +211546 |
| 2pioneer | 33 | Kono, Toru (1728) | Lost 1-2 | -151531 |
| 3pioneer | 41 | Matsuda, Yuki (1579) | Won 2-0 | +191550 |
| 4pioneer | 19 | Ito, Keita (1521) | Lost 0-2 | -181532 |
| 5pioneer | 69 | sohsuke, yamada (1507) | Won 2-0 | +171549 |
| 6pioneer | 47 | Honda, Rintaro (1797) | Lost 1-2 | -131536 |
| 7pioneer | 48 | Yokomizo, Gouki (1429) | Won 2-0 | +161552 |
| top | average opponent: 1611record: 4-3 | new rating: 1552 | ||
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1577 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 151 | Nagao, Shunsuke (1736) | Lost 1-2 | -151562 |
| 4sealed | 592 | Kobayashi, Takuro (1520) | Lost 1-2 | -191543 |
| 5sealed | 839 | Iiduka, Kazuhiko (1499) | Lost 0-2 | -181525 |
| top | average opponent: 1585record: 0-3 | new rating: 1525 | ||
| Grand Prix Yokohama 2019 (modern) | starting rating: 1580 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 486 | Ma, Noah (1789) | Lost 1-2 | -141566 |
| 4modern | 317 | Haruta, Takatsugu (1416) | Won 2-0 | +151581 |
| 5modern | 240 | Yamamura, Toshiki (1560) | Lost 0-2 | -181563 |
| 6modern | 581 | Masaki, Toshihiko (1526) | Won 2-0 | +171580 |
| 7modern | 392 | Watanabe, Kai (1558) | Lost 0-2 | -181562 |
| 8modern | 379 | Satou, Yoshinobu (1434) | Won 2-0 | +151577 |
| top | average opponent: 1547record: 3-3 | new rating: 1577 | ||
| Grand Prix Kyoto 2019 (RNA standard) | starting rating: 1547 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 387 | Akimoto, Taiki (1484) | Lost 0-2 | -201527 |
| 4standard | 658 | Osaka, Yusuke (1510) | Won 2-1 | +181545 |
| 5standard | 220 | Setsompop, Mingrerk (1522) | Won 2-0 | +181563 |
| 6standard | 264 | Xu, Siying (1839) | Won 2-1 | +231586 |
| 7standard | 160 | Winner, Fabian (1678) | Lost 0-2 | -171569 |
| 8standard | 114 | Omi, Tatsuya (1522) | Won 2-0 | +171586 |
| 9standard | 170 | Ishikawa, Takahiro (1725) | Won 2-1 | +211607 |
| 10standard | 69 | Honda, Okihisa (1666) | Lost 1-2 | -171590 |
| 11standard | 154 | Nagao, Yasutaka (1802) | Lost 1-2 | -141576 |
| 12standard | 165 | Yamada, Hiroki (1685) | Won 2-1 | +201596 |
| 13standard | 115 | Takeshita, Toru (1720) | Lost 1-2 | -161580 |
| top | average opponent: 1650record: 6-5 | new rating: 1580 | ||
| Grand Prix Shizuoka 2018 (legacy) (legacy) | starting rating: 1433 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 180 | Wu, Kuang (1546) | Won 2-0 | +201453 |
| 4legacy | 56 | Kawabata, Shou8056 (1548) | Lost 0-2 | -161437 |
| 5legacy | 145 | Furuichi, Takenori (1528) | Won 2-0 | +201457 |
| 6legacy | 44 | Kamachi, Naoki (1646) | Lost 0-2 | -151442 |
| 7legacy | 255 | Aoyama, Shun (1537) | Won 2-1 | +201462 |
| 8legacy | 88 | Suzuki, Takahiro 9351 (1553) | Won 2-0 | +191481 |
| 9legacy | 80 | Ikki, Notsu (1583) | Lost 0-2 | -161465 |
| 10legacy | 114 | Mendero Jr, Samuel (1573) | Lost 1-2 | -161449 |
| 11legacy | 105 | Kamioka, Masayuki (1592) | Won 2-1 | +211470 |
| 12legacy | 100 | Oshima, Shimpei (1465) | Won 2-0 | +181488 |
| 13legacy | 81 | Nakajima, Jun (1504) | Won 2-1 | +181506 |
| 14legacy | 64 | Murakami, Yuuki (1664) | Won 2-0 | +211527 |
| 15legacy | 46 | Matsuda, Hiroki (1617) | Won 2-1 | +201547 |
| top | average opponent: 1566record: 9-4 | new rating: 1547 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1479 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 279 | Saeki, Katsuhisa (1768) | Lost 1-2 | -121467 |
| 4sealed | 743 | Oda, Bumpei (1552) | Lost 1-2 | -171450 |
| 5sealed | 754 | Mitsunaga, Yuki (1512) | Lost 0-2 | -171433 |
| top | average opponent: 1611record: 0-3 | new rating: 1433 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1424 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 287 | Igarashi, Hisakazu (1498) | Lost 0-2 | -171407 |
| 3sealed | 595 | Sakaguchi, Takuya (1460) | Won 2-1 | +191426 |
| 4sealed | 440 | Hashimoto, Satoshi (1505) | Won 2-1 | +201446 |
| 5sealed | 501 | Matsushita, Masayoshi (1611) | Won 2-1 | +211467 |
| 6sealed | 315 | Kamioka, Masayuki (1603) | Won 2-1 | +201487 |
| 7sealed | 192 | Nose, Shunsuke (1881) | Won 2-1 | +251512 |
| 8sealed | 79 | Yamamoto, Kentaro (2066) | Lost 0-2 | -91503 |
| 9sealed | 106 | Meng, Chao Ching (1484) | Won 2-0 | +181521 |
| 10draft | 33 | Kawatsu, Shunsuke (1456) | Lost 1-2 | -201501 |
| 11draft | 119 | Kanno, Atsushi (1625) | Lost 0-2 | -151486 |
| 12draft | 239 | Fujii, Takashi (1626) | Won 2-0 | +201506 |
| 13draft | 46 | Deng, Yunan (1691) | Lost 0-2 | -141492 |
| 14draft | 166 | Yasuda, Masayuki (1824) | Lost 1-2 | -131479 |
| top | average opponent: 1641record: 7-6 | new rating: 1479 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1434 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 586 | Ikeda, Tomokazu (1427) | Lost 1-2 | -181416 |
| 4standard | 844 | Okubo, Yoshihiko (1517) | Lost 0-2 | -161400 |
| 5standard | 669 | Nakamura, Yusuke9351 (1465) | Lost 1-2 | -171383 |
| 6standard | 902 | Sekizawa, Shougo (1466) | Won 2-1 | +201403 |
| 7standard | 898 | Ikeda, Hiroaki (1543) | Won 2-1 | +201423 |
| 8standard | 514 | Yoshimoto, Takashi (1360) | Won 2-0 | +171440 |
| 9standard | 557 | Oikawa, Takaaki (1535) | Lost 0-2 | -161424 |
| top | average opponent: 1473record: 3-4 | new rating: 1424 | ||
| Grand Prix Chiba 2016 (legacy) | starting rating: 1449 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 51 | Okuno, Ryota (1500) | Lost 0-2 | -171432 |
| 2legacy | 761 | Sato, Ryoji (1473) | Lost 1-2 | -171415 |
| 3legacy | 1086 | Muroya, Issei (1437) | Won 2-1 | +181433 |
| 4legacy | 1051 | Nystrom, Sebastian (1449) | Lost 1-2 | -171416 |
| 5legacy | 1044 | Satho, Kai (1451) | Won 2-1 | +181434 |
| top | average opponent: 1462record: 2-3 | new rating: 1434 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 425 | Hori, Naomi (1452) | Lost 1-2 | -191481 |
| 2standard | 804 | Arai, Kohei (1482) | Lost 1-2 | -181463 |
| 3standard | 1451 | Ryuta, Ebisawa (1463) | Lost 1-2 | -181445 |
| 5standard | 1411 | Kobayashi, Saiki (1468) | Won 2-0 | +191464 |
| 6standard | 1124 | Tsutiya, Yukihiro (1498) | Won 2-1 | +181482 |
| 7standard | 843 | Koizumi, Yuma (1506) | Lost 0-2 | -171465 |
| 8standard | 925 | Kawabata, Yuji (1613) | Lost 1-2 | -161449 |
| top | average opponent: 1497record: 2-5 | new rating: 1449 | ||