Iwamoto, Shintaro
Current rating: 1629
Record: 21-15
| Grand Prix Nagoya 2020 (pioneer) | starting rating: 1542 | |||
| round | table | opponent (rating) | result | Δrating |
| 3pioneer | 342 | Uramoto, Leo (1528) | Lost 0-2 | -181524 |
| 4pioneer | 266 | Kihara, Yasuyuki (1546) | Won 2-0 | +181542 |
| 5pioneer | 199 | Makino, Takahito (1424) | Won 2-1 | +161558 |
| 6pioneer | 104 | Nagao, Kengo (1920) | Won 2-1 | +241582 |
| 7pioneer | 38 | Nishizawa, Yasuhide (1693) | Won 2-0 | +201602 |
| 8pioneer | 82 | Inui, Takashi (1719) | Lost 0-2 | -161586 |
| 9pioneer | 87 | Cho, Takuya (1647) | Won 2-1 | +191605 |
| 10pioneer | 108 | Cheng, Tung-Yi (1729) | Won 2-0 | +211626 |
| 11pioneer | 23 | Dadyko, Alexander (1767) | Lost 1-2 | -161610 |
| 12pioneer | 72 | Katayama, Hidenori (1752) | Won 2-1 | +211631 |
| 13pioneer | 42 | Yamamoto, Takashi (1570) | Lost 1-2 | -191612 |
| 14pioneer | 90 | Itou, Masahiro1014 (1551) | Won 2-0 | +171629 |
| 15pioneer | 45 | Maeba, Hideaki (1860) | ID | 01629 |
| top | average opponent: 1670record: 8-4-1 | new rating: 1629 | ||
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1545 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 456 | Urasaki, Takayuki (1616) | Lost 0-2 | -171528 |
| 4sealed | 583 | Sugimura, Masakazu (1404) | Won 2-0 | +161544 |
| 5sealed | 274 | Fujii, Hidekazu (1645) | Won 2-0 | +201564 |
| 6sealed | 273 | Kawamoto, Naoya (1449) | Won 2-0 | +161580 |
| 7sealed | 103 | Chen, Mingyang (1668) | Lost 0-2 | -171563 |
| 8sealed | 321 | Matsushima, Yuki (1369) | Lost 1-2 | -211542 |
| top | average opponent: 1525record: 3-3 | new rating: 1542 | ||
| Grand Prix Yokohama 2019 (modern) | starting rating: 1588 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 360 | Kanda, Akihiro (1380) | Lost 1-2 | -221566 |
| 3modern | 902 | Basallo III, Ricardo (1558) | Lost 0-2 | -181548 |
| 4modern | 941 | Yajima, Tomohiro (1482) | Won 2-0 | +171565 |
| 5modern | 877 | Higuchi, Yasuhiro (1446) | Lost 0-2 | -201545 |
| top | average opponent: 1466record: 1-3 | new rating: 1545 | ||
| Grand Prix Shizuoka 2018 (legacy) (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 72 | Abe, Masahide (1408) | Won 2-0 | +161516 |
| 3legacy | 245 | Uzuki, Yushi (1519) | Lost 1-2 | -181498 |
| 4legacy | 329 | Yoshida, Kei (1460) | Won 2-1 | +181516 |
| 5legacy | 188 | Murakami, Souta (1638) | Won 2-0 | +201536 |
| 6legacy | 175 | Furukawa, Shun (1580) | Won 2-1 | +191555 |
| 7legacy | 61 | Ogi, Suguru (1587) | Won 2-0 | +181573 |
| 8legacy | 40 | Sakuramoto, Takashi (1664) | Won 2-1 | +201593 |
| 9legacy | 14 | Segou, Kenji (1824) | Won 2-1 | +221615 |
| 10legacy | 14 | Sekikawa, Tsubasa (1729) | Lost 1-2 | -161599 |
| 11legacy | 20 | Ishigami, Nobuhide (1530) | Won 2-0 | +171616 |
| 12legacy | 8 | Yanagisawa, Yuta (1624) | Lost 0-2 | -181598 |
| 13legacy | 51 | Houseki, Hisayuki (1628) | Won 2-1 | +191617 |
| 14legacy | 14 | Fujihira, Kohei (1679) | Lost 1-2 | -171600 |
| 15legacy | 32 | Takahashi, Yuta (1974) | Lost 0-2 | -121588 |
| top | average opponent: 1632record: 9-5 | new rating: 1588 | ||