Iwasaki, Koichi
Current rating: 1473
Record: 53-65
- 2015
- 2016
- 2017
- 2018
- 2019
- 2020
| Grand Prix Nagoya 2020 (pioneer) | starting rating: 1458 | |||
| round | table | opponent (rating) | result | Δrating |
| 3pioneer | 185 | Ueda, Hikaru (1519) | Won 2-1 | +191477 |
| 4pioneer | 14 | Sekiya, Haruki (1557) | Won 2-1 | +191496 |
| 5pioneer | 91 | Aoki, Takeyuki (1467) | Lost 0-2 | -181478 |
| 6pioneer | 70 | Yan, Gan (1824) | Lost 0-2 | -121466 |
| 7pioneer | 193 | Park, Sangwook (1784) | Won 2-1 | +231489 |
| 8pioneer | 145 | Endo, Akiteru (1571) | Lost 0-2 | -161473 |
| top | average opponent: 1620record: 3-3 | new rating: 1473 | ||
| Grand Prix Nagoya 2019 (ELD standard) | starting rating: 1517 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 139 | Taniguchi, Hiroaki (1751) | Won 2-1 | +231540 |
| 4standard | 174 | Shiota, Fumihiko (1914) | Lost 0-2 | -121528 |
| 5standard | 144 | Terai, Tadayuki (1729) | Lost 1-2 | -141514 |
| 6standard | 491 | Suzuki, Masahiro 5436 (1687) | Lost 1-2 | -151499 |
| 7standard | 515 | Ishikawa, Naoki (1431) | Lost 1-2 | -191480 |
| 8standard | 480 | Kanekiyo, Ryusuke (1263) | Lost 1-2 | -221458 |
| top | average opponent: 1629record: 1-5 | new rating: 1458 | ||
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1545 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 529 | Sekiya, Hiroshi (1400) | Won 2-0 | +151560 |
| 4sealed | 7 | Shiohata, Ryosuke (1553) | Lost 1-2 | -181542 |
| 5sealed | 406 | Seki, Keita (1741) | Lost 0-2 | -141528 |
| 6sealed | 486 | Matoba, Takashi (1643) | Won 2-0 | +201548 |
| 7sealed | 237 | Sezume, Akihiro (1515) | Won 2-0 | +171565 |
| 8sealed | 217 | Yamazaki, Masaomi (1541) | Won 2-1 | +181583 |
| 9sealed | 148 | Kobayasi, Tomoya (1862) | Lost 1-2 | -131570 |
| 10draft | 169 | Lee, Ji-Hyun (1564) | Lost 0-2 | -181552 |
| 11draft | 92 | Inoue, Kohey (1598) | Won 2-1 | +191571 |
| 12draft | 45 | Miyawaki, Ryosuke (1556) | Lost 0-2 | -191552 |
| 13draft | 136 | Ozawa, Kensuke (1606) | Lost 1-2 | -171535 |
| 14draft | 117 | Urabe, Ryosuke (1541) | Lost 1-2 | -181517 |
| top | average opponent: 1593record: 5-7 | new rating: 1517 | ||
| Grand Prix Yokohama 2019 (modern) | starting rating: 1619 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 98 | Tsuzaki, Akira (1603) | Lost 1-2 | -191600 |
| 4modern | 474 | Jo, Bunkun (1613) | Lost 0-2 | -171583 |
| 5modern | 842 | Fujimoto, Kanta (1519) | Lost 0-2 | -201563 |
| 6modern | 872 | Soejima, Naoki (1520) | Lost 1-2 | -181545 |
| 7modern | 801 | Fukuda, Ayako (1464) | Won 2-0 | +161561 |
| 8modern | 602 | Hosoi, Ippei (1658) | Lost 0-2 | -161545 |
| top | average opponent: 1563record: 1-5 | new rating: 1545 | ||
| Grand Prix Kyoto 2019 (RNA standard) | starting rating: 1626 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 450 | Yamamoto, Shohei 7694 (1536) | Lost 0-2 | -191607 |
| 4standard | 438 | Kobayashi, Yuki9104 (1432) | Won 2-0 | +151622 |
| 5standard | 151 | Nobe, Hiroyuki (1514) | Won 2-1 | +161638 |
| 6standard | 214 | Kuroda, Yoshirou (1535) | Won 2-1 | +161654 |
| 7standard | 55 | Nomura, Tsuyoshi (1755) | Lost 0-2 | -161638 |
| 8standard | 135 | Tobo, Hayato (1586) | Lost 0-2 | -191619 |
| top | average opponent: 1559record: 3-3 | new rating: 1619 | ||
| Grand Prix Shizuoka 2018 (legacy) (legacy) | starting rating: 1486 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 122 | Mizui, Tomoyuki (1526) | Won 2-1 | +191505 |
| 4legacy | 125 | Murakami, Akinori (1654) | Lost 1-2 | -151490 |
| 5legacy | 223 | Abe, Ken'Ichi (1817) | Lost 0-2 | -131477 |
| 6legacy | 300 | Campbell, Chantelle (1587) | Won 2-0 | +201497 |
| 7legacy | 141 | Bang, Hyun-Jung (1580) | Won 2-1 | +201517 |
| 8legacy | 128 | Shibata, Akira (1593) | Won 2-1 | +191536 |
| 9legacy | 84 | Fujita, Tsuyoshi (1970) | Won 2-0 | +261562 |
| 10legacy | 43 | Chiba, Akio (2011) | Won 2-1 | +251587 |
| 11legacy | 21 | Fujihira, Kohei (1664) | Lost 0-2 | -161571 |
| 12legacy | 71 | Higuchi, Yuma (1649) | Won 2-1 | +191590 |
| 13legacy | 41 | Wong, Brian [HKG] (1636) | Won 2-1 | +191609 |
| 14legacy | 28 | Kwan, Philip (1574) | Won 2-0 | +171626 |
| 15legacy | 18 | Watanabe, Shouichi (1637) | ID | 01626 |
| top | average opponent: 1684record: 9-3-1 | new rating: 1626 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1472 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 225 | Ding, Yi (1766) | Won 2-1 | +231495 |
| 4sealed | 250 | Takagi, Takayuki (1769) | Lost 0-2 | -131482 |
| 5sealed | 426 | Tanaka, Mizuki (1497) | Won 2-1 | +181500 |
| 6sealed | 268 | Tezuka, Takatomo (1515) | Won 2-0 | +191519 |
| 7sealed | 165 | Moriyama, Yuu (1705) | Lost 1-2 | -151504 |
| 8sealed | 347 | Maruyama, Nobuhiro (1524) | Lost 0-2 | -181486 |
| top | average opponent: 1629record: 3-3 | new rating: 1486 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1452 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 16 | Takada, Takuya (1536) | Lost 0-2 | -171435 |
| 4sealed | 522 | Oshima, Shimpei (1426) | Lost 1-2 | -181417 |
| 5sealed | 707 | Kaga, Hiroyuki (1518) | Won 2-1 | +201437 |
| 6sealed | 459 | Kubo, Yuta (1620) | Lost 1-2 | -151422 |
| 7sealed | 794 | Onishi, Akira (1468) | Won 2-0 | +191441 |
| 8sealed | 627 | Portaro, Alessandro (1745) | Won 2-0 | +231464 |
| 9sealed | 277 | Kobayashi, Akio (1491) | Won 2-1 | +191483 |
| 10draft | 359 | Kobayashi, Tatsurou (1614) | Lost 1-2 | -161467 |
| 12draft | 215 | Kyo, Ifu (1651) | Lost 0-2 | -141453 |
| 13draft | 304 | Satou, Hiroki (1486) | Won 2-1 | +181471 |
| 14draft | 67 | Hiroi, Yuta (1428) | Lost 0-2 | -191452 |
| 15draft | 106 | Masuda, Keigo (1536) | Won 2-0 | +201472 |
| top | average opponent: 1543record: 6-6 | new rating: 1472 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1505 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 474 | Yoshida, Koki (1545) | Lost 0-2 | -171488 |
| 4modern | 762 | Yamakawa, Yoshiyuki (1498) | Lost 0-2 | -181470 |
| 5modern | 800 | Lim, David (1469) | Won 2-0 | +181488 |
| 6modern | 652 | Ota, Masahito (1459) | Lost 0-2 | -181470 |
| 7modern | 906 | Inoue, Reiichi (1472) | Lost 1-2 | -181452 |
| top | average opponent: 1489record: 1-4 | new rating: 1452 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1546 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 654 | Yoshihara, Shinji (1447) | Lost 0-2 | -191527 |
| 4standard | 748 | Tamura, Ryohei (1581) | Lost 0-2 | -171510 |
| 5standard | 994 | Nakai, Yoshiharu (1409) | Won 2-0 | +161526 |
| 6standard | 727 | Inoue, Daisuke (1481) | Won 2-1 | +171543 |
| 7standard | 396 | Hikawa, Ryo (1522) | Lost 1-2 | -181525 |
| 8standard | 503 | Iwasaki, Daisuke (1457) | Lost 1-2 | -201505 |
| top | average opponent: 1483record: 2-4 | new rating: 1505 | ||
| Grand Prix Chiba 2016 (legacy) | starting rating: 1417 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 271 | Su, Xing (1586) | Won 2-0 | +211438 |
| 4legacy | 152 | Griswold, Ethan (1472) | Won 2-0 | +191457 |
| 5legacy | 59 | Huang, Hao-Shan (1860) | Won 2-0 | +251482 |
| 6legacy | 33 | Takesue, Chikara (1761) | Won 2-0 | +231505 |
| 7legacy | 33 | Matsumoto, Kazuma 0580 (1584) | Lost 0-2 | -171488 |
| 8legacy | 104 | Yu, Lianbo (1556) | Won 2-1 | +191507 |
| 9legacy | 67 | Togores, Rodrigo (1820) | Lost 0-2 | -121495 |
| 10legacy | 107 | Wakita, Tomoyuki (1691) | Won 2-0 | +211516 |
| 11legacy | 38 | Takahashi, Toshiki (1598) | Won 2-0 | +201536 |
| 12legacy | 15 | Iwayama, Masatomo (1604) | Won 2-1 | +191555 |
| 13legacy | 25 | Toyota, Shimpei (1719) | Won 2-0 | +211576 |
| 14legacy | 5 | Ishii, Taisuke (1780) | Lost 0-2 | -141562 |
| 15legacy | 20 | Arai, Yusuke (1711) | Lost 0-2 | -161546 |
| top | average opponent: 1672record: 9-4 | new rating: 1546 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1401 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 276 | Takeishi, Kouji (1786) | Won 2-0 | +251426 |
| 4standard | 341 | Nakamura, Yuki 6139 (1498) | Lost 1-2 | -171409 |
| 5standard | 585 | Ishiwada, Hiroyuki (1734) | Lost 1-2 | -121397 |
| 6standard | 777 | Nagaoka, Takayuki (1823) | Won 2-0 | +251422 |
| 7standard | 493 | Yokomizo, Gouki (1609) | Won 2-1 | +221444 |
| 8standard | 276 | Matsubara, Ichiro (1808) | Lost 0-2 | -121432 |
| 9standard | 478 | Seo, Kenta (1599) | Lost 0-2 | -151417 |
| top | average opponent: 1694record: 3-4 | new rating: 1417 | ||
| Grand Prix Kobe 2015 (BFZ standard) | starting rating: 1398 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 480 | Toyohara, Eisuke (1438) | Lost 1-2 | -181380 |
| 4standard | 613 | Miyawaki, Takahiro (1621) | Won 2-0 | +231403 |
| 5standard | 290 | Babasaki, Taro (1653) | Won 2-1 | +221425 |
| 6standard | 294 | Yabuta, Junichi (1723) | Lost 0-2 | -131412 |
| 7standard | 266 | Otsuka, Tomohito (1569) | Lost 0-2 | -151397 |
| 8standard | 391 | Takahashi, Naohiro (1524) | Won 2-0 | +201417 |
| 9standard | 260 | Miyawaki, Yusuke (1510) | Lost 0-2 | -161401 |
| top | average opponent: 1577record: 3-4 | new rating: 1401 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 235 | Nakai, Yutaka (1652) | Lost 0-2 | -141432 |
| 3sealed | 312 | Yasunaka, Masaya (1447) | Lost 0-2 | -181414 |
| 4sealed | 443 | Yoshioka, Yoshitaka (1482) | Lost 0-2 | -161398 |
| top | average opponent: 1527record: 0-3 | new rating: 1398 | ||
| Grand Prix Kyoto 2015 (legacy) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 680 | Shibata, Yasumasa (1365) | Won 2-1 | +161499 |
| 3legacy | 659 | Nakahara, Yasuhiro (1490) | Lost 0-2 | -181481 |
| 4legacy | 803 | Mizutani, Yuki (1533) | Lost 0-2 | -171464 |
| 5legacy | 866 | Takashima, Ryuichi (1497) | Lost 1-2 | -181446 |
| top | average opponent: 1471record: 1-3 | new rating: 1446 | ||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 719 | Goto, Daiki (1606) | Lost 0-2 | -161484 |
| 2sealed | 1012 | Nagae, Yasuji (1339) | Won 2-0 | +151499 |
| 3sealed | 979 | Matsumoto, Yoshihiro (1501) | Won 2-0 | +181517 |
| 4sealed | 748 | Mori, Yusei (1520) | Won 2-1 | +181535 |
| 5sealed | 739 | Kondou, Masaru (1556) | Lost 0-2 | -171518 |
| 6sealed | 810 | Hibino, Yasutaka (1590) | Lost 1-2 | -171501 |
| 7sealed | 877 | Hsin, Michael (1502) | Lost 1-2 | -181483 |
| top | average opponent: 1516record: 3-4 | new rating: 1483 | ||