Iwamoto, Masahiro
Current rating: 1504
Record: 7-7
| Grand Prix Nagoya 2012 (RTR standard) | starting rating: 1501 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 415 | Murakami, Yuusuke (Tokyo) (1500) | Won 2-1 | +181519 |
| 2standard | 337 | Morita, Kouki (1564) | Lost 0-2 | -181501 |
| 3standard | 496 | Anan, Kazuyoshi (1529) | Lost 0-2 | -171484 |
| 4standard | 668 | Itou, Masayoshi (1444) | Won 2-1 | +171501 |
| 5standard | 610 | Matsuda, Tomohiro (1570) | Lost 0-2 | -171484 |
| 6standard | 529 | Yamazaki, Shinpei (1480) | Won 2-1 | +181502 |
| 7standard | 448 | Wakita, Daiki (1539) | Won 2-0 | +191521 |
| 8standard | 345 | Arai, Kenichiro (1567) | Lost 0-2 | -171504 |
| average opponent: 1524record: 4-4 | new rating: 1504 | |||
| Grand Prix Yokohama 2012 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 431 | Yoshiki S., (1500) | Lost 1-2 | -181482 |
| 2modern | 555 | Kajiyama, Yu (1408) | Won 2-0 | +171499 |
| 3modern | 532 | Nakazono, Kouya (1624) | Lost 1-2 | -161483 |
| 4modern | 558 | Sumikawa, Daiki (1483) | Won 2-0 | +181501 |
| 5modern | 502 | Noguchi, Hiromasa (1500) | Won 2-1 | +181519 |
| 6modern | 226 | Oiso, Kenji (1503) | Lost 0-2 | -181501 |
| average opponent: 1503record: 3-3 | new rating: 1501 | |||