Iwazaki, Masahiko
Current rating: 1569
Record: 17-14
| Grand Prix Nagoya 2020 (pioneer) | starting rating: 1588 | |||
| round | table | opponent (rating) | result | Δrating |
| 2pioneer | 162 | Inazawa, Ryo (1482) | Won 2-0 | +161604 |
| 3pioneer | 205 | Yabata, Kenichi (1288) | Won 2-1 | +131617 |
| 4pioneer | 160 | Nagao, Yasutaka (1774) | Lost 1-2 | -161601 |
| 5pioneer | 322 | Usui, Syou (1886) | Lost 0-2 | -131588 |
| 6pioneer | 429 | Matsui, Tatsuyoshi (1484) | Lost 0-2 | -191569 |
| top | average opponent: 1583record: 2-3 | new rating: 1569 | ||
| Grand Prix Nagoya 2019 (ELD standard) | starting rating: 1578 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 187 | Tanaka, Shinichi 0666 (1520) | Lost 1-2 | -191559 |
| 3standard | 485 | Tatsuki, Makoto (1482) | Won 2-0 | +161575 |
| 4standard | 290 | Nakagawa, Hiroki (1425) | Won 2-1 | +151590 |
| 5standard | 399 | Kayahira, Tomoya (1540) | Lost 0-2 | -181572 |
| 6standard | 449 | Yokotani, Junpei (1524) | Won 2-0 | +171589 |
| 7standard | 300 | Hirose, Yoshiyuki (1617) | Lost 1-2 | -181571 |
| 8standard | 332 | Kamo, Kyouhei (1511) | Won 2-1 | +171588 |
| top | average opponent: 1517record: 4-3 | new rating: 1588 | ||
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 388 | Kaneko, Hiroto (1379) | Won 2-0 | +161481 |
| 2sealed | 316 | Okuda, Masateru (1496) | Lost 0-2 | -171464 |
| 3sealed | 589 | Takaya, Akio (1495) | Won 2-0 | +181482 |
| 4sealed | 736 | Hayashi, Nobuaki (1513) | Won 2-1 | +191501 |
| 5sealed | 191 | Okino, Ryuu (1666) | Won 2-1 | +211522 |
| 6sealed | 115 | Zhao, Jin (1612) | Won 2-1 | +191541 |
| 7sealed | 117 | Watanabe, Kouhei 8114 (1570) | Lost 1-2 | -171524 |
| 8sealed | 148 | Yokoi, Takuya (1639) | Won 2-0 | +201544 |
| 9sealed | 162 | Oohashi, Toshiyuki (1799) | Won 2-0 | +231567 |
| 10draft | 122 | Kabeshita, Yoshito (1640) | Lost 0-2 | -171550 |
| 11draft | 201 | Nakayama, Yasuaki (1680) | Won 2-0 | +201570 |
| 12draft | 183 | Hattori, Takesi (1632) | Lost 0-2 | -171553 |
| 13draft | 163 | Kazuki, Muto (1596) | Won 2-1 | +191572 |
| 14draft | 110 | Schiber, Christopher (1809) | Won 2-1 | +221594 |
| 15draft | 28 | Tanaka, Syunya (1661) | Lost 0-2 | -161578 |
| top | average opponent: 1613record: 10-5 | new rating: 1578 | ||
| Grand Prix Kyoto 2007 (PLC standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 266 | Satou, Masayoshi (1507) | Won 2-0 | +181518 |
| 2standard | 25 | Watanabe, Shinji (1501) | Lost 0-2 | -181500 |
| 3standard | 152 | Honnami, Tomoyuki (1592) | Lost 1-2 | -171483 |
| 4standard | 350 | Tsuji, Mariko (1455) | Lost 0-2 | -181465 |
| top | average opponent: 1514record: 1-3 | new rating: 1465 | ||