Iwahashi, Hiroki
Current rating: 1631
Record: 37-25-2
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1670 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 27 | Tanabe, Kazuya (1060) | Won 2-0 | +81678 |
| 2sealed | 28 | Kubota, Taiga (1498) | Won 2-1 | +141692 |
| 3sealed | 262 | Umi, Hirokazu (1578) | Won 2-1 | +161708 |
| 4sealed | 211 | Kashima, Akihiro (1712) | Lost 0-2 | -181690 |
| 5sealed | 227 | Gokan, Yuta (1383) | Lost 1-2 | -231667 |
| 6sealed | 513 | Namikawa, Katsuya (1625) | Lost 1-2 | -191648 |
| 7sealed | 528 | Saito, Tomoya (1707) | Lost 0-2 | -171631 |
| top | average opponent: 1509record: 3-4 | new rating: 1631 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1686 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 313 | Yasugi, Haruaki (1500) | Won 2-1 | +151701 |
| 2sealed | 383 | Matsui, Hideyuki (1439) | Won 2-0 | +131714 |
| 3sealed | 277 | Wada, Tsubasa (1540) | Lost 0-2 | -211693 |
| 4sealed | 351 | Okamura, Marei (1541) | Won 2-1 | +151708 |
| 5sealed | 150 | Arai, Kenichiro (1734) | Lost 1-2 | -171691 |
| 6sealed | 356 | Mitsuya, Teppei (1524) | Lost 1-2 | -211670 |
| top | average opponent: 1546record: 3-3 | new rating: 1670 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1714 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 450 | Yamada, Takahiro (1377) | Won 2-0 | +121726 |
| 2sealed | 29 | Hirooka, Hideki (1426) | Lost 1-2 | -231703 |
| 3sealed | 751 | Tamai, Hideaki (1442) | Won 2-0 | +131716 |
| 4sealed | 709 | Ong, Hak Tiong (1545) | Won 2-0 | +151731 |
| 5sealed | 447 | Toyoda, Takahiro (1535) | Won 2-0 | +151746 |
| 6sealed | 205 | Tanaka, Yu (1596) | Lost 0-2 | -211725 |
| 7sealed | 374 | Kikuchi, Takeshi (1588) | Lost 1-2 | -201705 |
| 8sealed | 650 | Riphat, Aziz (1674) | Lost 1-2 | -191686 |
| top | average opponent: 1523record: 4-4 | new rating: 1686 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1651 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 257 | Saito, Shinnosuke (1446) | Won 2-0 | +141665 |
| 2standard | 489 | Doo, Godwin (1584) | Won 2-1 | +161681 |
| 3standard | 626 | Itazu, Yoshihisa (1434) | Lost 0-2 | -221659 |
| 4standard | 956 | Higashino, Shogo (1368) | Won 2-0 | +131672 |
| 5standard | 520 | Kawakami, Tomoyori (1553) | Won 2-0 | +161688 |
| 6standard | 252 | Aoki, Yuki (1552) | Won 2-0 | +151703 |
| 7standard | 216 | Mochizuki, Masaki (1579) | Draw 1-1 | -21701 |
| 8standard | 146 | Kataoka, Hiroaki (1585) | Won 2-1 | +161717 |
| 9standard | 84 | Umeki, Ryo (1591) | Won 2-0 | +161733 |
| 10standard | 54 | Yoshimoto, Masanobu (1623) | Won 2-0 | +161749 |
| 11standard | 27 | Sato, Takatoshi (1881) | Lost 1-2 | -161733 |
| 12standard | 81 | Horie, Tooru (1721) | Lost 0-2 | -181715 |
| 13standard | 160 | Miura, Yuuki (1707) | Lost 0-2 | -181697 |
| 14standard | 229 | Ohnishi, Jyunpei (1684) | Won 2-0 | +171714 |
| top | average opponent: 1593record: 9-4-1 | new rating: 1714 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1533 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 725 | Wanibuchi, Kouji (1432) | Won 2-1 | +161549 |
| 2sealed | 92 | Yamada, Masato (1536) | Won 2-0 | +181567 |
| 3sealed | 153 | Fujimori, Masayoshi (1604) | Won 2-0 | +191586 |
| 4sealed | 138 | Kozakai, Yukio (1792) | Won 2-0 | +221608 |
| 5sealed | 102 | Inoue, Kota (1442) | Lost 0-2 | -211587 |
| 6sealed | 243 | Yasu, Ryotaro (1532) | Lost 1-2 | -191568 |
| 7sealed | 236 | Sato, Yuichi (1460) | Won 2-0 | +161584 |
| 8sealed | 278 | Kamon, Noritoshi (1547) | Draw 1-1 | -11583 |
| 9sealed | 273 | Kakinoki, Junichi (1539) | Won 2-1 | +171600 |
| 10draft | 185 | Shimizu, Yousuke (1691) | Won 2-1 | +201620 |
| 11draft | 205 | Suematsu, Takaaki (1837) | Won 2-0 | +221642 |
| 12draft | 200 | Soh, Weng Heng (1883) | Won 2-1 | +221664 |
| 13draft | 11 | Kusakawa, Naoto (1531) | Won 2-0 | +161680 |
| 14draft | 11 | Takao, Shota (1988) | Lost 0-2 | -131667 |
| 15draft | 11 | Yasufuku, Akihiro (1750) | Lost 1-2 | -161651 |
| top | average opponent: 1638record: 10-4-1 | new rating: 1651 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1495 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1292 | Iijima, Fumitika (1500) | Won 2-1 | +181513 |
| 2sealed | 950 | Okuda, Ryouta (1517) | Won 2-1 | +181531 |
| 3sealed | 939 | Ushikubo, Kenichi (1494) | Lost 1-2 | -181513 |
| 4sealed | 1045 | Wu, Chia-Ju (1487) | Lost 0-2 | -191494 |
| 5sealed | 1162 | Okada, Hayaki (1498) | Won 2-0 | +181512 |
| 6sealed | 1096 | Ookubo, Izumi (1515) | Won 2-0 | +181530 |
| 7sealed | 963 | Fujimaki, Satoshi (1606) | Won 2-0 | +201550 |
| 8sealed | 916 | Nishiura, Ryosuke (1629) | Lost 1-2 | -171533 |
| top | average opponent: 1531record: 5-3 | new rating: 1533 | ||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 214 | Inoue, Kota (1312) | Won 2-1 | +151515 |
| 2sealed | 18 | Kamioka, Masayuki (1500) | Won 2-1 | +171532 |
| 3sealed | 164 | Miyano, Shinichi (1542) | Lost 0-2 | -171515 |
| 4sealed | 325 | Toshida, Shin'ichi (1465) | Won 2-1 | +171532 |
| 5sealed | 168 | Kanari, Ken (1539) | Lost 0-2 | -181514 |
| 6sealed | 159 | Miyakawa, Ayumu (1492) | Lost 1-2 | -191495 |
| top | average opponent: 1475record: 3-3 | new rating: 1495 | ||