Arita, Kouichirou
Current rating: 1631
Record: 28-24-3 (GP) / 8-8 (professional)
| Grand Prix Shizuoka 2018 (legacy) (legacy) | starting rating: 1596 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 94 | Higuchi, Akashi (1676) | Won 2-0 | +191615 |
| 4legacy | 12 | Kaku, Tomohiro (1653) | Won 2-1 | +191634 |
| 5legacy | 38 | Zhang, Hongqiang (1692) | Won 2-0 | +191653 |
| 6legacy | 18 | Yukuhiro, Ken (2087) | Won 2-1 | +261679 |
| 7legacy | 11 | Watanabe, Shogo5163 (1610) | Lost 1-2 | -201659 |
| 8legacy | 27 | Nakanishi, Kazuki (1502) | Won 2-0 | +161675 |
| 9legacy | 25 | Katayama, Ryuichi (1591) | Lost 1-2 | -201655 |
| 10legacy | 56 | Yamabe, Kazumi (1445) | Lost 1-2 | -221633 |
| 11legacy | 60 | Noto, Kohei (1502) | Lost 1-2 | -201613 |
| 12legacy | 85 | Yako, Ryuichi (1616) | Won 2-0 | +181631 |
| top | average opponent: 1637record: 6-4 | new rating: 1631 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1650 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 62 | Tachibana, Kentarou (1583) | Won 2-0 | +171667 |
| 4standard | 13 | Mutou, Masaya (1537) | Won 2-0 | +161683 |
| 5standard | 8 | Itagaki, Yota (1527) | Won 2-1 | +151698 |
| 6standard | 46 | Ehara, Kouta (1596) | Won 2-0 | +161714 |
| 7standard | 26 | Matsumura, Takehiko (1616) | Lost 1-2 | -201694 |
| 8standard | 26 | Takemura, Yuuki (1566) | Lost 0-2 | -201674 |
| 9standard | 118 | Morofuji, Takuma (2074) | Lost 1-2 | -111663 |
| 10standard | 255 | Nishiyama, Naoki (1558) | Lost 1-2 | -201643 |
| 11standard | 355 | Iijima, Shin (1561) | Lost 0-2 | -191624 |
| 12standard | 352 | Yamagata, Hiroki (1520) | Lost 1-2 | -201604 |
| 13standard | 337 | Miyanishi, Makoto (1477) | Won 2-0 | +151619 |
| 14standard | 289 | Murase, Tatsuya (1457) | Draw 1-1 | -21617 |
| 15standard | 276 | Makigano, Motohiro (1478) | Lost 0-2 | -211596 |
| top | average opponent: 1581record: 5-7-1 | new rating: 1596 | ||
| Grand Prix Chiba 2016 (legacy) | starting rating: 1552 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 72 | Kamei, Kazuhiko (1424) | Won 2-1 | +161568 |
| 4legacy | 61 | Kato, Kensuke (1701) | Lost 1-2 | -161552 |
| 5legacy | 272 | Tuda, Yoshiyuki (1498) | Won 2-0 | +171569 |
| 6legacy | 261 | Yoshida, Atsushi (1500) | Won 2-0 | +171586 |
| 7legacy | 113 | Sugaya, Hironobu (1794) | Won 2-0 | +221608 |
| 8legacy | 102 | Ikarashi, Satoru (1548) | Lost 1-2 | -191589 |
| 9legacy | 157 | Ishiguro, Tetsuya (1530) | Won 2-0 | +171606 |
| 10legacy | 51 | Katou, Yuki (1591) | Won 2-1 | +171623 |
| 11legacy | 90 | Kim, Sang-eun (1849) | Won 2-0 | +221645 |
| 12legacy | 32 | Shigeta, Hajime (1644) | Won 2-1 | +181663 |
| 13legacy | 15 | Omori, Ken'ichirou (1954) | Lost 0-2 | -131650 |
| 14legacy | 25 | Kobayashi, Yuuki (1713) | Won 2-0 | +201670 |
| 15legacy | 42 | Sakuramoto, Takashi (1606) | Lost 1-2 | -201650 |
| top | average opponent: 1642record: 9-4 | new rating: 1650 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1548 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 109 | Kobayashi, Kazutaka (Kyoto) (1518) | Lost 0-2 | -191529 |
| 3standard | 1130 | Shioiri, Hiroki (1500) | Won 2-0 | +181547 |
| 4standard | 867 | Nagahama, Ryo (1441) | Won 2-1 | +161563 |
| 5standard | 650 | Sakurai, Yoshinori (1537) | Won 2-0 | +171580 |
| 6standard | 260 | Kakimoto, Keigo (1590) | Won 2-0 | +181598 |
| 7standard | 125 | Kawasaki, Keita (1958) | Lost 1-2 | -111587 |
| 8standard | 241 | Kidera, Seita (1659) | Lost 1-2 | -171570 |
| 9standard | 483 | Yamamoto, Takahiro (1562) | Won 2-1 | +181588 |
| 10standard | 460 | Yoshida, Akihiko (1646) | Lost 0-2 | -171571 |
| 11standard | 396 | Nishimura, Yoshiyasu (1534) | Lost 1-2 | -191552 |
| top | average opponent: 1594record: 5-5 | new rating: 1552 | ||
| Grand Prix Kobe 2015 (BFZ standard) | starting rating: 1534 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 339 | Akabane, Shu (1400) | Lost 0-2 | -201514 |
| 3standard | 957 | Kitahara, Shinichi (1499) | Draw 1-1 | -11513 |
| 4standard | 818 | Maitani, Shintarou (1433) | Won 2-0 | +171530 |
| 5standard | 550 | Sasaki, Kazuo (1461) | Won 2-0 | +171547 |
| 6standard | 364 | Akada, Yasunori (1600) | Draw 1-1 | +11548 |
| top | average opponent: 1479record: 2-1-2 | new rating: 1548 | ||
| Pro Tour Magic Origins (ORI standard) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1draft | 189 | Anteri, Fabrizio (1961) | Won 2-1 | +271491 |
| 2draft | 176 | Utter-Leyton, Josh (1981) | Lost 0-2 | -101481 |
| 3draft | 145 | Little, Dustin (1474) | Won 2-0 | +181499 |
| 4standard | 45 | Lee, Brian (1684) | Lost 1-2 | -151484 |
| 5standard | 88 | Oliveira Graichen, Leonardo (1632) | Won 2-0 | +211505 |
| 6standard | 46 | Turtenwald, Owen (2017) | Lost 0-2 | -91496 |
| 7standard | 112 | Al Takrouri, Karim (1524) | Won 2-0 | +181514 |
| 8standard | 60 | Rubin, Steve (2018) | Lost 1-2 | -91505 |
| 9draft | 74 | Sim, Chapman (1873) | Lost 1-2 | -121493 |
| 10draft | 43 | Umehara, Kei (1843) | Lost 0-2 | -121481 |
| 11draft | 117 | Longhurst, Kenneth (1578) | Won 2-0 | +201501 |
| 12standard | 101 | Bastecki, Alex (1548) | Lost 1-2 | -171484 |
| 13standard | 107 | Magalhaes, Edgar (1893) | Lost 1-2 | -111473 |
| 14standard | 106 | Goldsmith, Dylan (1653) | Won 2-0 | +211494 |
| 15standard | 91 | Ruiz Martin, Daniel (1672) | Won 2-0 | +211515 |
| 16standard | 83 | Thompson, Sean (1560) | Won 2-1 | +191534 |
| top | average opponent: 1744record: 8-8 | new rating: 1534 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 54 | Moriki, Tomohiro (1541) | Lost 1-2 | -171483 |
| 3sealed | 406 | Suzumura, Keisuke (1580) | Lost 0-2 | -161467 |
| 4sealed | 467 | Nagase, Yuuichi (1333) | Won 2-0 | +151482 |
| 5sealed | 284 | Kiyama, Yoshiaki (1500) | Lost 0-2 | -181464 |
| top | average opponent: 1489record: 1-3 | new rating: 1464 | ||