Koizumi, Kaoru
Current rating: 1621
Record: 13-7-2
| Grand Prix Yamagata 2006 (TSP limited) | starting rating: 1612 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 19 | Moriyama, Masahiro (1445) | Won 2-0 | +151627 |
| 2sealed | 40 | Maki, Koichiro (1815) | Draw 1-1 | +41631 |
| 3sealed | 47 | Eguchi, Motoaki (1464) | Won 2-0 | +151646 |
| 4sealed | 56 | Saito, Hirotsugu (1535) | Won 2-1 | +161662 |
| 5sealed | 28 | Hirayama, Daisuke (1477) | Lost 1-2 | -221640 |
| 6sealed | 58 | Murata, Kouji (1608) | Won 2-1 | +181658 |
| 7sealed | 65 | Saito, Takaya (1677) | Lost 0-2 | -181640 |
| 8sealed | 57 | Yamaguchi, Shinya (1599) | Lost 0-2 | -191621 |
| average opponent: 1578record: 4-3-1 | new rating: 1621 | |||
| Grand Prix Hiroshima 2006 (CSP limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 26 | Kime, Shingo (1536) | Won 2-1 | +191519 |
| 2sealed | 39 | Hayashi, Kyogo (1518) | Draw 1-1 | 01519 |
| 3sealed | 63 | Nakauchi, Mayumi (1522) | Won 2-1 | +181537 |
| 4sealed | 59 | Itou, Takanori (1420) | Won 2-1 | +161553 |
| 5sealed | 29 | Okamura, Hideki (1554) | Won 2-1 | +181571 |
| 6sealed | 15 | Shiwaku, Tsuyoshi (1704) | Won 2-0 | +201591 |
| 7sealed | 61 | Kitayama, Masaya (1604) | Won 2-1 | +181609 |
| 8sealed | 22 | Ikeda, Tsuyoshi (1911) | Won 2-0 | +241633 |
| 9draft | 12 | Ishimura, Shintaro (1850) | Lost 1-2 | -141619 |
| 10draft | 4 | Nuijten, Julien (1903) | Lost 0-2 | -131606 |
| 11draft | 13 | Yasooka, Shota (2009) | Lost 0-2 | -111595 |
| 12draft | 14 | Tsuta, Naoto (1586) | Won 2-1 | +171612 |
| 13draft | 17 | Kim, Min Su (1558) | Lost 0-2 | -191593 |
| 14draft | 8 | Komiyama, Hideki (1641) | Won 2-0 | +191612 |
| average opponent: 1665record: 9-4-1 | new rating: 1612 | |||