Iwatsu, Hirotaka
Current rating: 1669
Record: 43-32-2
| Grand Prix Kobe 2017 (modern) | starting rating: 1608 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 389 | Ito, Atsushi (1760) | Won 2-0 | +211629 |
| 2modern | 619 | Kato, Jun (1541) | Won 2-1 | +161645 |
| 3modern | 667 | Xu, Siying (1518) | Lost 1-2 | -201625 |
| 4modern | 639 | Yamada, Masaki (1541) | Won 2-1 | +161641 |
| 5modern | 599 | Seko, Kazuki (1462) | Won 2-0 | +151656 |
| 6modern | 316 | Miura, Takahiro (1545) | Won 2-1 | +161672 |
| 7modern | 159 | Inukai, Masahiro (1572) | Lost 0-2 | -201652 |
| 8modern | 277 | Mihara, Yuki (1551) | Lost 1-2 | -191633 |
| 9modern | 567 | Ng, Dexter (1553) | Won 2-0 | +161649 |
| 10modern | 401 | Kabeshita, Yoshito (1568) | Won 2-0 | +171666 |
| 11modern | 165 | Fujimoto, Yosuke (1708) | Won 2-1 | +181684 |
| 12modern | 98 | Xiao, Han (1838) | Lost 0-2 | -151669 |
| top | average opponent: 1597record: 8-4 | new rating: 1669 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1628 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 212 | Yasuda, Yoshifumi (1509) | Lost 0-2 | -201608 |
| top | record: 0-1 | new rating: 1608 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1654 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 747 | Nunotani, Kousuke (1574) | Lost 1-2 | -201634 |
| 2sealed | 650 | Kaneko, Mitsutaka (1467) | Won 2-0 | +151649 |
| 3sealed | 1038 | Deguchi, Keizou (1484) | Lost 0-2 | -211628 |
| top | average opponent: 1508record: 1-2 | new rating: 1628 | ||
| Grand Prix Kobe 2015 (BFZ standard) | starting rating: 1535 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 425 | Murata, Kazuki (1414) | Won 2-0 | +161551 |
| 2standard | 179 | Kosuga, Shuhei (1447) | Won 2-1 | +161567 |
| 3standard | 575 | Abe, Yuuta (1559) | Won 2-1 | +181585 |
| 4standard | 189 | Yagi, Areji (1553) | Won 2-1 | +181603 |
| 5standard | 25 | Ikushima, Yasuyuki (1678) | Won 2-0 | +191622 |
| 6standard | 17 | Shiotani, Keiichiro (1594) | Won 2-1 | +171639 |
| 7standard | 27 | Ootsuka, Koutarou (1867) | Won 2-0 | +231662 |
| 8standard | 7 | Saito, Takaya (1765) | Won 2-1 | +191681 |
| 9standard | 6 | Hirato, Ougi (1809) | Lost 0-2 | -151666 |
| 10standard | 15 | Izumi, Hikaru (1753) | Won 2-1 | +191685 |
| 11standard | 6 | Kibe, Keisuke (1831) | Won 2-0 | +211706 |
| 12standard | 5 | Okada, Naoya (1727) | Lost 0-2 | -181688 |
| 13standard | 13 | Nishimoto, Takuya (1703) | Draw 1-1 | +11689 |
| 14standard | 19 | Wang, Kaiyin (1639) | Lost 0-2 | -191670 |
| 15standard | 40 | Takagi, Takeshi (1788) | Lost 1-2 | -161654 |
| top | average opponent: 1675record: 10-4-1 | new rating: 1654 | ||
| Grand Prix Kyoto 2015 (legacy) | starting rating: 1581 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 298 | Tamai, Yuno (1506) | Won 2-0 | +171598 |
| 2legacy | 28 | Shikibu, Hayato (1483) | Lost 0-2 | -211577 |
| 3legacy | 293 | Sasaki, Daisuke (1326) | Lost 0-2 | -221555 |
| 4legacy | 330 | Wakamatsu, Akimasa (1467) | Lost 1-2 | -201535 |
| top | average opponent: 1446record: 1-3 | new rating: 1535 | ||
| Grand Prix Kobe 2014 (modern) | starting rating: 1602 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 867 | Murakami, Kazuya3837 (1636) | Lost 0-2 | -171585 |
| 4modern | 888 | Iriyama, Koki (1518) | Won 2-0 | +171602 |
| 5modern | 819 | Matsumoto, Masaya (1484) | Lost 1-2 | -211581 |
| 6modern | 905 | Kudo, Koichi (1683) | Won 2-1 | +201601 |
| 7modern | 850 | Azuma, Tatsuya (1473) | Lost 0-2 | -201581 |
| top | average opponent: 1559record: 2-3 | new rating: 1581 | ||
| Grand Prix Nagoya 2012 (RTR standard) | starting rating: 1597 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 33 | Tamai, Hideaki (1485) | Lost 1-2 | -201577 |
| 2standard | 540 | Fumihiro K., (1379) | Won 2-0 | +151592 |
| 3standard | 519 | Kawaguchi, Akira (1511) | Lost 0-2 | -201572 |
| 4standard | 569 | Takeda, Hiroya (1439) | Won 2-0 | +161588 |
| 5standard | 428 | Ikegami, Mirai (1503) | Won 2-0 | +161604 |
| 6standard | 365 | Ishida, Ryouhei (1516) | Won 2-0 | +171621 |
| 7standard | 172 | Kameyama, Takeshi (1592) | Lost 0-2 | -191602 |
| top | average opponent: 1489record: 4-3 | new rating: 1602 | ||
| Grand Prix Kobe 2012 (DKA limited) | starting rating: 1597 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 208 | Sasaki, Yuusuke (Aichi) (1553) | Lost 0-2 | -191578 |
| 2sealed | 428 | Takeda, Shingo (1480) | Won 2-1 | +161594 |
| 3sealed | 208 | Yamamoto, Shouhei (1741) | Lost 0-2 | -151579 |
| 4sealed | 401 | Takashima, Mao (1449) | Won 2-1 | +161595 |
| 5sealed | 403 | Kawakami, Hiroshi (1734) | Won 2-1 | +201615 |
| 6sealed | 238 | Moriya, Toshihiko (1629) | Lost 1-2 | -181597 |
| top | average opponent: 1598record: 3-3 | new rating: 1597 | ||
| Grand Prix Hiroshima 2011 (ISD standard) | starting rating: 1642 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 62 | Sugiyama, Yuu (1518) | Won 2-0 | +151657 |
| 3standard | 83 | Kamizono, Naoki (1559) | Lost 0-2 | -191638 |
| 4standard | 124 | Toshiyuki H., (1517) | Lost 1-2 | -211617 |
| 5standard | 278 | Kawaguchi, Takahiro (1470) | Lost 1-2 | -201597 |
| top | average opponent: 1516record: 1-3 | new rating: 1597 | ||
| Grand Prix Kobe 2009 (extended) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 121 | Iwakane, Yuya (1524) | Won 2-0 | +191483 |
| 2extended | 108 | tomida, ryo (1516) | Draw 1-1 | +11484 |
| 3extended | 85 | Kajitani, Takayuki (1553) | Lost 1-2 | -171467 |
| 4extended | 174 | Okada, Jun (1419) | Won 2-1 | +171484 |
| 5extended | 125 | Nakagawa, Tsukasa (1410) | Won 2-0 | +171501 |
| 6extended | 78 | Hibino, Yasutaka (1531) | Won 2-1 | +181519 |
| 7extended | 120 | Chen, Liang (1701) | Won 2-1 | +221541 |
| 8extended | 10 | Nakajima, Takumi (1570) | Won 2-1 | +181559 |
| 9extended | 17 | Endo, Ryota (1641) | Won 2-1 | +201579 |
| 10extended | 33 | Kawate, Junpei (1655) | Won 2-0 | +191598 |
| 11extended | 33 | Kikuchi, Yuuji (1792) | Won 2-0 | +211619 |
| 12extended | 4 | Motoshiromizu, Hiroshi (1621) | Won 2-1 | +191638 |
| 13extended | 47 | Kondou, Keiichi (1684) | Lost 1-2 | -181620 |
| 14extended | 6 | Ikeshita, Tooru (1806) | Won 2-0 | +221642 |
| top | average opponent: 1602record: 11-2-1 | new rating: 1642 | ||
| Grand Prix Shizuoka 2008 (MOR standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 179 | Nagata, Hiroyuki (1500) | Lost 0-2 | -181482 |
| 2standard | 241 | kishimoto, tatsuya (1466) | Lost 0-2 | -181464 |
| 3standard | 332 | Hashiba, Daiki (1465) | Lost 0-2 | -181446 |
| 4standard | 384 | Oogushi, Hiroki (1430) | Won 2-1 | +171463 |
| 5standard | 312 | Amino, Kaoru (1463) | Won 2-1 | +181481 |
| 6standard | 247 | Sakamoto, Sakito (1511) | Lost 0-2 | -171464 |
| top | average opponent: 1473record: 2-4 | new rating: 1464 | ||