Yamamoto, Kei
Current rating: 1449
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1338 | Asami, Seigi (1522) | Won 2-1 | +191484 |
| 2sealed | 1180 | Aoi, Masashi (1518) | Lost 1-2 | -171467 |
| 3sealed | 1107 | Suzuki, Seiji (1501) | Lost 0-2 | -181449 |
| top | average opponent: 1514record: 1-2 | new rating: 1449 | ||
| Grand Prix Yokohama 2010 (extended) | starting rating: 1502 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 243 | Mizobuchi, Yuuji (1500) | Lost 0-2 | -181484 |
| 2extended | 391 | Watanabe, Masaki (1432) | Lost 1-2 | -191465 |
| top | average opponent: 1466record: 0-2 | new rating: 1465 | ||
| Grand Prix Kitakyushu 2009 (ZEN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 43 | Ono, Takahisa (1500) | Won 2-0 | +181518 |
| 2sealed | 77 | Kikuchi, Yuuji (1749) | Won 2-0 | +221540 |
| 3sealed | 43 | Nishiwaki, Masato (1417) | Lost 1-2 | -201520 |
| 4sealed | 75 | Yashiro, Takuya (1531) | Lost 1-2 | -181502 |
| top | average opponent: 1549record: 2-2 | new rating: 1502 | ||