Seiwada, Koyo
Current rating: 1456
Record: 16-21-1
| Regional Championships Chiba 2023 (pioneer) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 6 | Murakami, Kazuya3837 (1889) | Won 2-1 | +251508 |
| 2pioneer | 8 | Ide, Kazushige (1532) | Lost 1-2 | -171491 |
| 3pioneer | 54 | JANG, HYUNDEOK (1552) | Lost 0-2 | -171474 |
| 4pioneer | 87 | Ozawa, Takeshi (1921) | Won 2-1 | +261500 |
| 5pioneer | 54 | Kim, Jeong Heon (1530) | Lost 0-2 | -181482 |
| 6pioneer | 75 | Murae, Ryuji (2002) | Lost 1-2 | -91473 |
| 7pioneer | 73 | Uechi, Shintaro (1517) | Lost 1-2 | -171456 |
| top | average opponent: 1706record: 2-5 | new rating: 1456 | ||
| Grand Prix Shizuoka 2018 (legacy) (legacy) | starting rating: 1502 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 389 | Takashima, Fumito (1461) | Draw 1-1 | 01502 |
| 2legacy | 341 | Ito, Kensuke (1339) | Won 2-1 | +151517 |
| 3legacy | 295 | Saito, Fumiya (1525) | Lost 1-2 | -181499 |
| 4legacy | 432 | Sakamoto, Kensuke (1446) | Won 2-0 | +171516 |
| 5legacy | 300 | Sagawa, Zen (1466) | Won 2-0 | +171533 |
| 6legacy | 182 | Heshiki, Tomohiro (1596) | Lost 1-2 | -171516 |
| 7legacy | 297 | Yang, Chen Han (1534) | Lost 1-2 | -181498 |
| 8legacy | 328 | Hiroi, Genki (1666) | Lost 0-2 | -151483 |
| top | average opponent: 1504record: 3-4-1 | new rating: 1483 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1493 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 220 | Kumazawa, Takanori (1426) | Won 2-0 | +171510 |
| 2sealed | 366 | Ebihara, Hirotaka (1665) | Won 2-1 | +211531 |
| 3sealed | 210 | Nose, Shunsuke (1863) | Lost 1-2 | -131518 |
| 4sealed | 715 | Kamikawa, Takuya (1484) | Won 2-1 | +181536 |
| 5sealed | 501 | Funahashi, Shun (1596) | Lost 0-2 | -171519 |
| 6sealed | 434 | Sibata, Kouji (1581) | Lost 0-2 | -171502 |
| 7sealed | 546 | Okamoto, Ryo (1657) | Lost 1-2 | -151487 |
| 8sealed | 541 | Itazu, Boram (1351) | Won 2-1 | +151502 |
| top | average opponent: 1578record: 4-4 | new rating: 1502 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1462 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 540 | Kubota, Koki (1462) | Won 2-0 | +181480 |
| 2modern | 122 | Fukushima, Shingo (1516) | Won 2-0 | +191499 |
| 3modern | 347 | Kawaguchi, Tetsu (1648) | Won 2-0 | +211520 |
| 4modern | 44 | Limsakdakul, Wathanyu (1489) | Lost 1-2 | -191501 |
| 5modern | 454 | Chiba, Takato (1679) | Lost 1-2 | -151486 |
| 6modern | 764 | Sukigara, Ryoma (1515) | Won 2-1 | +191505 |
| 7modern | 297 | Ishihara, Atsushi (1643) | Lost 1-2 | -161489 |
| 8modern | 720 | Kiyonaga, Sho (1610) | Lost 1-2 | -151474 |
| 9modern | 735 | Yasufuku, Akihiro (1551) | Won 2-1 | +191493 |
| top | average opponent: 1568record: 5-4 | new rating: 1493 | ||
| Grand Prix Chiba 2016 (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 470 | Sasaki, Kenji (1500) | Lost 1-2 | -181482 |
| 2legacy | 687 | Aramoto, Keita (1481) | Lost 0-2 | -181464 |
| 3legacy | 1066 | Kousaka, Hitoshi (1379) | Won 2-0 | +161480 |
| 4legacy | 954 | Oyama, Takumi (1451) | Lost 1-2 | -181462 |
| 5legacy | 1042 | Gale, Adam (1506) | Won 2-1 | +191481 |
| 6legacy | 956 | Sakaida, Yuuki (1465) | Lost 0-2 | -191462 |
| top | average opponent: 1464record: 2-4 | new rating: 1462 | ||