Iwama, Gaku
Current rating: 1488
Record: 37-41-3
| Grand Prix Nagoya 2020 (pioneer) | starting rating: 1527 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 246 | Yamamoto, Yoshiki (1468) | Won 2-1 | +171544 |
| 2pioneer | 97 | Matsuda, Tomoya (1466) | Won 2-0 | +171561 |
| 3pioneer | 409 | Yuki, Ryosuke (1626) | Lost 0-2 | -171544 |
| 4pioneer | 253 | Soyama, Tomohiro (1425) | Lost 0-2 | -201524 |
| 5pioneer | 515 | Takemoto, Hikaru (1623) | Lost 1-2 | -161508 |
| 6pioneer | 575 | Kubota, Hirofumi (1400) | Lost 1-2 | -201488 |
| top | average opponent: 1501record: 2-4 | new rating: 1488 | ||
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1478 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 378 | Yamada, Chiaki (1452) | Won 2-0 | +171495 |
| 2sealed | 276 | Aida, Yasuki (1567) | Won 2-1 | +201515 |
| 3sealed | 410 | Ito, Ryota (1351) | Won 2-0 | +151530 |
| 4sealed | 51 | Ookawa, Yuusuke (1659) | Lost 0-2 | -161514 |
| 5sealed | 181 | Nakamura, Junya (1709) | Won 2-0 | +221536 |
| 6sealed | 256 | Saida, Toshihiro (2000) | Lost 1-2 | -111525 |
| 7sealed | 231 | Zhou, Zhaoqi (1686) | Lost 1-2 | -151510 |
| 8sealed | 423 | Shimazaki, Keita (1447) | Won 2-0 | +171527 |
| top | average opponent: 1609record: 5-3 | new rating: 1527 | ||
| Grand Prix Shizuoka 2018 (standard) (GRN standard) | starting rating: 1455 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 647 | Ejima, Kazuki (1518) | Won 2-1 | +191474 |
| 2standard | 256 | Baba, Yukihiro (1622) | Lost 0-2 | -151459 |
| 3standard | 790 | Naraya, Takaaki (1788) | Won 2-0 | +231482 |
| 4standard | 546 | Yakushi, Hideki (1531) | Lost 1-2 | -171465 |
| 5standard | 775 | Kitagawa, Hiroyuki (1675) | Lost 1-2 | -141451 |
| 6standard | 802 | Koyama, Koya (1483) | Won 2-1 | +191470 |
| 7standard | 654 | Wang, Weiliang (1559) | Won 2-1 | +191489 |
| 8standard | 614 | Takeda, Harunobu (1863) | Lost 0-2 | -111478 |
| top | average opponent: 1630record: 4-4 | new rating: 1478 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1489 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 658 | Sato, Motohiko (1673) | Lost 0-2 | -141475 |
| 2sealed | 631 | Aizawa, Taku (1412) | Won 2-1 | +171492 |
| 3sealed | 750 | Asahina, Takuya (1392) | Lost 0-2 | -201472 |
| 4sealed | 841 | Shimono, Tetsuro (1527) | Lost 0-2 | -171455 |
| top | average opponent: 1501record: 1-3 | new rating: 1455 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1505 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 291 | Miki, Hiroshi (1445) | Lost 0-2 | -191486 |
| 2sealed | 719 | Miyake, Keigo (1461) | Won 2-0 | +171503 |
| 3sealed | 779 | Tanaka, Yuji (1495) | Won 2-0 | +181521 |
| 4sealed | 726 | Vega, Daniel (1662) | Lost 1-2 | -151506 |
| 5sealed | 807 | Fujita, Shunsuke (1528) | Lost 1-2 | -181488 |
| 6sealed | 791 | Yamamoto, Yuta (1531) | Won 2-0 | +191507 |
| 7sealed | 668 | Yoshida, Akinobu (1648) | Lost 0-2 | -151492 |
| 8sealed | 761 | Yamauchi, Takashi (1409) | Won 2-0 | +161508 |
| 9sealed | 583 | Hanyuu, Kento (1476) | Lost 0-2 | -191489 |
| top | average opponent: 1517record: 4-5 | new rating: 1489 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1486 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 712 | Kageura, Taisuke (1601) | Lost 1-2 | -161470 |
| 2standard | 622 | Asai, Tetsuya (1482) | Draw 1-1 | 01470 |
| 3standard | 1150 | Kumada, Hiroki (1481) | Won 2-1 | +181488 |
| 4standard | 922 | Koike, Junya (1499) | Won 2-1 | +181506 |
| 5standard | 643 | Qian, Zhengrui (1492) | Won 2-0 | +181524 |
| 6standard | 401 | Sano, Takumi (1442) | Draw 1-1 | -11523 |
| 7standard | 607 | Matsuura, Shuhei (1530) | Lost 0-2 | -181505 |
| 8standard | 768 | Sato, Ryoya (1495) | Won 2-1 | +181523 |
| 9standard | 585 | Izumiya, Yoshiaki (1542) | Lost 1-2 | -181505 |
| top | average opponent: 1507record: 4-3-2 | new rating: 1505 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1476 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 1013 | Take, Toshiharu (1508) | Won 2-1 | +181494 |
| 2standard | 230 | Shiroza, Shinichiro (1602) | Lost 0-2 | -161478 |
| 3standard | 1001 | Yuya, Ida (1501) | Won 2-1 | +191497 |
| 4standard | 905 | Hikawa, Ryo (1520) | Won 2-0 | +181515 |
| 5standard | 510 | Otsuka, Tomohito (1734) | Won 2-1 | +221537 |
| 6standard | 146 | Nitta, Ryou (1628) | Lost 1-2 | -161521 |
| 7standard | 603 | Kita, Sakuya (1562) | Draw 1-1 | +11522 |
| 8standard | 472 | Nose, Kouta (1559) | Lost 1-2 | -181504 |
| 9standard | 695 | Fujikura, Iori (1476) | Lost 1-2 | -181486 |
| top | average opponent: 1566record: 4-4-1 | new rating: 1486 | ||
| Grand Prix Kobe 2012 (DKA limited) | starting rating: 1473 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 206 | Yoshida, Takashi (1500) | Won 2-0 | +181491 |
| 2sealed | 31 | Ishihara, Takashi (1632) | Lost 0-2 | -151476 |
| 3sealed | 287 | Teshima, Hisanori (1437) | Won 2-1 | +171493 |
| 4sealed | 222 | Morita, Susumu (1524) | Lost 1-2 | -171476 |
| top | average opponent: 1523record: 2-2 | new rating: 1476 | ||
| Grand Prix Kobe 2008 (Lorwyn block) | starting rating: 1488 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 209 | Adachi, Ryosuke (1476) | Won 2-1 | +181506 |
| 2block | 34 | Inoue, Toru (1520) | Lost 0-2 | -181488 |
| 3block | 305 | Yanagisawa, Tadahiro (1588) | Lost 0-2 | -161472 |
| 4block | 318 | Mori, Daisuke (1486) | Won 2-1 | +181490 |
| 5block | 216 | hanada, masato (1500) | Lost 0-2 | -181472 |
| 6block | 246 | Inoue, Kouichi (1467) | Won 2-0 | +181490 |
| 7block | 220 | Tsai, Chih-Chun (1537) | Lost 0-2 | -171473 |
| top | average opponent: 1511record: 3-4 | new rating: 1473 | ||
| Grand Prix Kyoto 2007 (PLC standard) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 54 | Ueyama, Yuji (1511) | Won 2-0 | +191484 |
| 2standard | 170 | Hori, Tetsuya (1518) | Won 2-0 | +191503 |
| 3standard | 94 | Chen, Shen (1500) | Won 2-0 | +181521 |
| 4standard | 35 | Aono, Yoshio (1504) | Lost 1-2 | -191502 |
| 5standard | 80 | Kawakubo, Takuya (1518) | Won 2-1 | +191521 |
| 6standard | 79 | Hori, Nobuaki (1553) | Lost 0-2 | -181503 |
| 7standard | 108 | Ohnishi, Jyunpei (1473) | Lost 0-2 | -181485 |
| 8standard | 146 | Goto, Kosuke (1615) | Won 2-0 | +201505 |
| 9standard | 110 | Kudou, Ikuhiro (1544) | Lost 0-2 | -171488 |
| top | average opponent: 1526record: 5-4 | new rating: 1488 | ||
| Grand Prix Niigata 2005 (Kamigawa block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 130 | Nakajima, Masatsugu (1500) | Won 2-1 | +181518 |
| 2block | 29 | Suzuki, Yuta (1504) | Lost 1-2 | -181500 |
| 3block | 91 | Ono, Ippei (1555) | Lost 0-2 | -171483 |
| 4block | 206 | Tanabe, Kazuya (1338) | Won 2-0 | +151498 |
| 5block | 138 | Murata, Atsushi (1501) | Won 2-0 | +181516 |
| 6block | 123 | Ono, Makoto (1597) | Lost 1-2 | -161500 |
| 7block | 116 | Ikeda, Yuuichirou (1505) | Lost 0-2 | -181482 |
| 8block | 113 | Hashimoto, Yuu (1569) | Lost 0-2 | -171465 |
| top | average opponent: 1509record: 3-5 | new rating: 1465 | ||