Iwata, Hiromichi
Current rating: 1670
Record: 28-17-1
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1619 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 262 | Nuruki, Hiroaki (1774) | Lost 0-2 | -151604 |
| 2sealed | 794 | Nakamura, Sara (1579) | Won 2-0 | +181622 |
| 3sealed | 709 | Shiraishi, Masaharu (1678) | Won 2-0 | +191641 |
| 4sealed | 768 | Mikami, Wataru (1396) | Won 2-1 | +131654 |
| 5sealed | 229 | Murase, Hiroshi (1759) | Won 2-1 | +201674 |
| 6sealed | 129 | Kukino, Yudai (1585) | Won 2-1 | +171691 |
| 7sealed | 131 | Yamada, Yosuke 0291 (1546) | Lost 0-2 | -211670 |
| top | average opponent: 1617record: 5-2 | new rating: 1670 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1615 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 1 | Hanesaka, Tetsuya (1500) | Won 2-1 | +161631 |
| 2modern | 166 | Kamei, Tomotake (1356) | Draw 1-1 | -51626 |
| 3modern | 685 | Noguchi, Ryota (1516) | Won 2-0 | +161642 |
| 4modern | 354 | Nishida, Tetsushi (1520) | Won 2-0 | +161658 |
| 5modern | 174 | Imamura, Gen (1548) | Lost 0-2 | -201638 |
| 6modern | 407 | Mishima, Keita (1724) | Won 2-1 | +191657 |
| 7modern | 261 | Niwa, Toshiharu (1550) | Lost 0-2 | -201637 |
| 8modern | 449 | Hasegawa, Kazunari (1651) | Lost 1-2 | -181619 |
| top | average opponent: 1545record: 4-3-1 | new rating: 1619 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1569 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1064 | Noto, Yoshinari (1455) | Won 2-1 | +161585 |
| 2sealed | 1085 | Tamura, Kei (1408) | Lost 0-2 | -211564 |
| 3sealed | 1091 | Yokoyama, Shinta (1557) | Won 2-0 | +181582 |
| 4sealed | 1013 | Hagiwara, Tomoaki (1517) | Lost 1-2 | -191563 |
| 5sealed | 1192 | Aida, Kazuki (1452) | Won 2-0 | +161579 |
| 6sealed | 1035 | Tomita, Keishi (1522) | Won 2-1 | +171596 |
| 7sealed | 961 | Shiraishi, Makoto (1562) | Won 2-0 | +171613 |
| 8sealed | 942 | Onuki, Hirohito (1557) | Won 2-1 | +171630 |
| 9sealed | 898 | Suganuma, Takayuki (1674) | Won 2-1 | +191649 |
| 10draft | 97 | Yamada, Takuya (1686) | Lost 0-2 | -171632 |
| 11draft | 23 | Furusato, Hiroshi (1691) | Lost 1-2 | -171615 |
| top | average opponent: 1553record: 7-4 | new rating: 1615 | ||
| Grand Prix Kobe 2014 (modern) | starting rating: 1534 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 990 | Tanaka, Hayato (1478) | Won 2-1 | +171551 |
| 2modern | 934 | Yamamoto, Yukihiko (1518) | Won 2-1 | +181569 |
| 3modern | 715 | Shinoda, Akito (1540) | Lost 1-2 | -191550 |
| 4modern | 836 | Ito, Shinichi (1521) | Lost 1-2 | -181532 |
| 5modern | 963 | Omori, Tomoaki (1776) | Won 2-0 | +221554 |
| 6modern | 889 | Shimizu, Takeyasu (1517) | Won 2-0 | +171571 |
| 7modern | 821 | Genno, Yuusuke (1531) | Won 2-0 | +181589 |
| 8modern | 797 | Saito, Syuta (1550) | Won 2-0 | +171606 |
| 9modern | 753 | Takenouchi, Tatsuya (1607) | Won 2-1 | +181624 |
| 10modern | 55 | Okino, Ryuu (1670) | Lost 1-2 | -171607 |
| 11modern | 102 | Ito, Ryo0497 (1594) | Lost 1-2 | -191588 |
| 12modern | 118 | Miyagi, Moto (1534) | Lost 0-2 | -191569 |
| top | average opponent: 1570record: 7-5 | new rating: 1569 | ||
| Grand Prix Yokohama 2012 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 190 | Hirato, Ougi (1500) | Won 2-0 | +181518 |
| 2modern | 273 | Iwabuchi, Sou (1518) | Won 2-1 | +181536 |
| 3modern | 122 | Terao, Manato (1482) | Won 2-1 | +171553 |
| 4modern | 91 | Takahashi, Taro (1484) | Won 2-0 | +171570 |
| 5modern | 37 | Koshimura, Takeshi (1507) | Won 2-1 | +171587 |
| 6modern | 19 | Okumura, Noriaki (1484) | Lost 0-2 | -201567 |
| 7modern | 71 | Kurata, Yoshihiko (1558) | Lost 0-2 | -181549 |
| 8modern | 190 | Kawakami, Hiroshi (1749) | Lost 0-2 | -151534 |
| top | average opponent: 1535record: 5-3 | new rating: 1534 | ||