Yamasaki, Kouichi
Current rating: 1511
Record: 3-3
| Grand Prix Niigata 2009 (M10 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 51 | Uchida, Atsushi (1484) | Won 2-0 | +181518 |
| 2sealed | 135 | Oohashi, Toshiya (1579) | Won 2-0 | +191537 |
| 3sealed | 33 | Hayashi, Hiroki (1736) | Won 2-1 | +211558 |
| 4sealed | 16 | Mori, Katsuhiro (1949) | Lost 0-2 | -111547 |
| 5sealed | 99 | Mukai, Isao (1538) | Lost 0-2 | -181529 |
| 6sealed | 124 | Haneda, Ryouhei (1526) | Lost 0-2 | -181511 |
| average opponent: 1635record: 3-3 | new rating: 1511 | |||