Iwata, Sou
Current rating: 1477
Record: 53-63-1
Grand Prix Kobe 2015Grand Prix Nagoya 2016Grand Prix Tokyo 2016Grand Prix Chiba 2016Grand Prix Shizuoka 2017Grand Prix Kobe 2017Grand Prix Kyoto 2017Grand Prix Chiba 2018Grand Prix Shizuoka 2018 (legacy)Grand Prix Shizuoka 2018 (standard)Grand Prix Yokohama 2019Grand Prix Chiba 2019Grand Prix Nagoya 2019Grand Prix Nagoya 2020
| Grand Prix Nagoya 2020 (pioneer) | starting rating: 1488 | |||
| round | table | opponent (rating) | result | Δrating |
| 2pioneer | 76 | Miyake, Hideyuki (1830) | Lost 0-2 | -121476 |
| 3pioneer | 510 | Suganuma, Kouhei (1500) | Lost 1-2 | -181458 |
| 4pioneer | 716 | Akita, Ryosuke (1428) | Won 2-0 | +181476 |
| 5pioneer | 468 | Kaga, Hiroyuki (1515) | Won 2-1 | +181494 |
| 6pioneer | 284 | Amemiya, Kouhei (1602) | Lost 1-2 | -161478 |
| 7pioneer | 437 | Tse, Cloudy (1474) | Won 2-0 | +181496 |
| 8pioneer | 294 | Yaegasi, Naoki (1443) | Lost 0-2 | -191477 |
| top | average opponent: 1542record: 3-4 | new rating: 1477 | ||
| Grand Prix Nagoya 2019 (ELD standard) | starting rating: 1421 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 175 | Esuga, Yuuki (1425) | Won 2-1 | +181439 |
| 3standard | 438 | Sakadani, Naoki (1518) | Won 2-0 | +191458 |
| 4standard | 187 | Matsumura, Toshikazu (1682) | Won 2-1 | +221480 |
| 5standard | 55 | Fujiya, Takahiro (1635) | Lost 1-2 | -151465 |
| 6standard | 248 | Kamo, Kyouhei (1547) | Won 2-1 | +191484 |
| 7standard | 51 | Tanabe, Mikiyasu (1637) | Won 2-0 | +211505 |
| 8standard | 47 | Kurata, Shintaro (1688) | Lost 1-2 | -141491 |
| 9standard | 172 | Ichimura, Yuji (1585) | Lost 0-2 | -171474 |
| 10standard | 155 | Itou, Shougo (1809) | Won 2-1 | +241498 |
| 11standard | 130 | Hirano, Mikita (1704) | Won 2-1 | +221520 |
| 12standard | 69 | Sasaki, Tsutomu (1641) | Lost 0-2 | -161504 |
| 13standard | 101 | Abe, Michio (1536) | Won 2-0 | +191523 |
| 14standard | 64 | Nagoya, Ryouta (1495) | Lost 0-2 | -191504 |
| 15standard | 98 | Iwasaki, Takashi (1599) | Lost 1-2 | -161488 |
| top | average opponent: 1607record: 8-6 | new rating: 1488 | ||
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1467 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 409 | Kikuchi, Masaki (1543) | Lost 1-2 | -161451 |
| 3sealed | 936 | Sim, Chapman (1733) | Lost 1-2 | -131438 |
| 4sealed | 917 | Yamashina, Yusuke (1481) | Lost 0-2 | -171421 |
| top | average opponent: 1586record: 0-3 | new rating: 1421 | ||
| Grand Prix Yokohama 2019 (modern) | starting rating: 1450 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 448 | Okano, Toshiya (1726) | Lost 1-2 | -131437 |
| 4modern | 603 | Hara, Ryota (1527) | Won 2-1 | +201457 |
| 5modern | 521 | Aoki, Shunji (1527) | Lost 0-2 | -171440 |
| 6modern | 476 | Hong, Jungmo (1527) | Won 2-1 | +201460 |
| 7modern | 428 | Ono, Takuya (1512) | Won 2-0 | +191479 |
| 8modern | 233 | Shimizu, Ryouta (1686) | Won 2-0 | +221501 |
| 9modern | 151 | Takemura, Daichi (1564) | Lost 0-2 | -171484 |
| 10modern | 158 | Shen, Yufei (1579) | Lost 0-2 | -171467 |
| top | average opponent: 1581record: 4-4 | new rating: 1467 | ||
| Grand Prix Shizuoka 2018 (standard) (GRN standard) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 529 | Higaki, Motohide (1649) | Won 2-0 | +211503 |
| 4standard | 355 | Kobayasi, Tomoya (1784) | Lost 0-2 | -131490 |
| 5standard | 443 | Okuyama, Sanshirou (1406) | Lost 0-2 | -191471 |
| 6standard | 669 | Ma, Junjie (1452) | Won 2-0 | +181489 |
| 7standard | 475 | Takimoto, Yusuke (1583) | Won 2-1 | +191508 |
| 8standard | 395 | Nishi, Eiichi (1509) | Won 2-0 | +181526 |
| 9standard | 88 | Hoshide, Naonari (1624) | Lost 1-2 | -161510 |
| 10standard | 127 | Matsuyama, Ryousuke (1651) | Lost 1-2 | -151495 |
| 11standard | 167 | Ichikawa, Takayoshi (1658) | Lost 1-2 | -151480 |
| 12standard | 167 | Nakamura, Yuu (1485) | Won 2-1 | +181498 |
| 13standard | 153 | Arunrattananukul, Paween (1500) | Lost 1-2 | -181480 |
| 14standard | 141 | Nagano, Keita (1693) | Lost 0-2 | -141466 |
| 15standard | 140 | Goshima, Akito (1626) | Lost 0-2 | -161450 |
| top | average opponent: 1586record: 5-8 | new rating: 1450 | ||
| Grand Prix Shizuoka 2018 (legacy) (legacy) | starting rating: 1472 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 199 | Suzuki, Takahiro 9351 (1535) | Lost 1-2 | -171455 |
| 4legacy | 377 | Miyanishi, Makoto (1585) | Won 2-1 | +201475 |
| 5legacy | 284 | Arreza, Quinn Norli (1610) | Won 2-1 | +211496 |
| 6legacy | 86 | Fujikura, Akinori (1713) | Lost 0-2 | -141482 |
| 7legacy | 235 | Ikeda, Yuuki (1612) | Won 2-1 | +201502 |
| 8legacy | 150 | Ushijima, Syun (1421) | Lost 1-2 | -201482 |
| top | average opponent: 1579record: 3-3 | new rating: 1482 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1450 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 315 | Noumi, Tomoaki (1502) | Won 2-1 | +191469 |
| 4sealed | 22 | Muraoka, Hideaki (1540) | Won 2-0 | +191488 |
| 5sealed | 8 | Honda, Rintaro (1799) | Lost 1-2 | -121476 |
| 6sealed | 287 | Lai, Pak Yin (1734) | Won 2-1 | +221498 |
| 7sealed | 147 | Nishida, Makoto (1600) | Lost 1-2 | -161482 |
| 8sealed | 202 | Lee, Shi Tian (1933) | Lost 0-2 | -101472 |
| top | average opponent: 1685record: 3-3 | new rating: 1472 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1486 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 164 | Furuya, Satoshi (1216) | Lost 0-2 | -231463 |
| 4sealed | 405 | Arimatsu, Naoto (1520) | Lost 0-2 | -171446 |
| 5sealed | 606 | Murata, Tetsuhiro (1477) | Draw 1-1 | 01446 |
| 6sealed | 748 | Goto, Kosuke (1437) | Won 2-0 | +181464 |
| 7sealed | 540 | Tomita, Naoki (1633) | Lost 0-2 | -151449 |
| 8sealed | 674 | Taki, Mayumi (1476) | Lost 1-2 | -171432 |
| 9sealed | 635 | Takahashi, Toshirou (1437) | Won 2-1 | +181450 |
| top | average opponent: 1457record: 2-4-1 | new rating: 1450 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1563 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 242 | Minamizuka, Yuusuke (1629) | Lost 0-2 | -171546 |
| 3modern | 893 | Mizue, Youta (1555) | Lost 0-2 | -181528 |
| 4modern | 947 | Nakahara, Hiroki (1482) | Lost 1-2 | -181510 |
| 5modern | 1244 | Osakabe, Masakazu (1429) | Lost 1-2 | -201490 |
| 6modern | 1192 | Torii, Yuto (1507) | Won 2-0 | +181508 |
| 7modern | 1019 | Saito, Tomoyuki (1382) | Lost 0-2 | -201488 |
| 8modern | 919 | Okuhara, Yuuki (1547) | Won 2-0 | +191507 |
| 9modern | 763 | Okunaga, Yuuki (1309) | Lost 0-2 | -211486 |
| top | average opponent: 1480record: 2-6 | new rating: 1486 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1459 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 427 | Tamai, Yuno (1563) | Lost 0-2 | -161443 |
| 3standard | 825 | Yamasaki, Taro (1499) | Lost 1-2 | -171426 |
| 4standard | 1084 | Sonoda, Takayuki (1357) | Won 2-0 | +171443 |
| 5standard | 849 | Kunisada, Shougo (1494) | Won 2-0 | +191462 |
| 6standard | 604 | Nakada, Ryo (1671) | Won 2-1 | +221484 |
| 7standard | 464 | Ohno, Isao (1705) | Won 2-1 | +221506 |
| 8standard | 185 | Yoshikawa, Yuta (1664) | Won 2-1 | +211527 |
| 9standard | 192 | Takeshita, Toru (1743) | Won 2-0 | +211548 |
| 10standard | 109 | Takahira, Shunsuke (1842) | Won 2-0 | +241572 |
| 11standard | 81 | Saito, Shinya (1761) | Lost 0-2 | -151557 |
| 12standard | 147 | Iwasaki, Takashi (1569) | Lost 0-2 | -181539 |
| 13standard | 191 | Han, Yi (1610) | Won 2-1 | +201559 |
| 14standard | 171 | Hosoi, Ippei (1753) | Won 2-0 | +211580 |
| 15standard | 113 | Kobayashi, Ryohei (1631) | Lost 1-2 | -171563 |
| top | average opponent: 1633record: 9-5 | new rating: 1563 | ||
| Grand Prix Chiba 2016 (legacy) | starting rating: 1487 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 326 | Hayashida, Yoshiyuki (1518) | Lost 1-2 | -171470 |
| 3legacy | 645 | Yamada, Michihiro (1465) | Won 2-0 | +171487 |
| 4legacy | 645 | Hongou, Satoshi (1479) | Won 2-0 | +181505 |
| 5legacy | 247 | Calderon, Andrew (1825) | Lost 1-2 | -121493 |
| 6legacy | 596 | Sue, Ryoichi (1516) | Lost 1-2 | -181475 |
| 7legacy | 623 | Yoshida, Kenji (1507) | Lost 0-2 | -171458 |
| 8legacy | 717 | Mikami, Noriaki (1516) | Lost 1-2 | -171441 |
| 9legacy | 711 | Kumagae, Kousuke (1463) | Won 2-0 | +181459 |
| top | average opponent: 1536record: 3-5 | new rating: 1459 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1480 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 77 | Haruta, Takatsugu (1391) | Lost 1-2 | -201460 |
| 3standard | 1228 | Hoshina, Kohei (1418) | Won 2-0 | +171477 |
| 4standard | 920 | Endo, Yasuhiko (1522) | Won 2-1 | +191496 |
| 5standard | 394 | Tsunoda, Yotaro (1451) | Lost 1-2 | -191477 |
| 6standard | 555 | Nagami, Youichi (1756) | Won 2-0 | +231500 |
| 7standard | 348 | Sakamoto, Takumi (1553) | Won 2-1 | +191519 |
| 8standard | 203 | Hirose, Naoki (1566) | Won 2-0 | +191538 |
| 9standard | 196 | Kakuta, Taisuke (1620) | Lost 1-2 | -171521 |
| 10standard | 451 | Matsumoto, Kazuma (1567) | Lost 1-2 | -171504 |
| 11standard | 373 | Mizumoto, Hirotaka (1544) | Lost 0-2 | -171487 |
| top | average opponent: 1539record: 5-5 | new rating: 1487 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1499 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 751 | Ogawa, Daiki (1505) | Lost 1-2 | -181481 |
| 2sealed | 899 | Hamanaka, Hironori (1486) | Won 2-0 | +181499 |
| 3sealed | 831 | Parpura, Igor (1500) | Won 2-0 | +181517 |
| 4sealed | 711 | Sasaki, Osamu (1481) | Lost 1-2 | -191498 |
| 5sealed | 936 | Ootsu, Takuya (1501) | Lost 1-2 | -181480 |
| 6sealed | 857 | Asahina, Takuya (1445) | Won 2-1 | +181498 |
| 7sealed | 831 | Yamada, Yoshiaki (1485) | Lost 1-2 | -181480 |
| top | average opponent: 1486record: 3-4 | new rating: 1480 | ||
| Grand Prix Kobe 2015 (BFZ standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 276 | Ohno, Naoki (1477) | Won 2-0 | +181518 |
| 2standard | 161 | Sato, Hisao (1572) | Won 2-1 | +191537 |
| 3standard | 441 | Sugita, Wataru (1500) | Lost 0-2 | -191518 |
| 4standard | 750 | Honda, Yuji (1596) | Won 2-0 | +191537 |
| 5standard | 326 | Wada, Akihiro (1415) | Lost 0-2 | -201517 |
| 6standard | 494 | Kitazawa, Noriyuki (1500) | Lost 0-2 | -181499 |
| top | average opponent: 1510record: 3-3 | new rating: 1499 | ||