Hamada, Koichi
Current rating: 1505
Record: 7-7
| Grand Prix Shizuoka 2001 (ODY limited) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 126 | Yamano, Tatsuto (1500) | Won 2-0 | +191483 |
| 2sealed | 99 | Futamata, Shunji (1518) | Won 2-0 | +181501 |
| 3sealed | 95 | Arita, Ryuichi (1598) | Lost 1-2 | -161485 |
| 4sealed | 120 | Hirai, Masumi (1555) | Won 2-1 | +191504 |
| 5sealed | 42 | Shimojo, Takuya (1508) | Won 2-1 | +181522 |
| 6sealed | 61 | Tajiri, Satoshi (1613) | Won 2-0 | +201542 |
| 7sealed | 36 | Yasuda, Masaaki (1555) | Lost 0-2 | -181524 |
| 8sealed | 42 | Sasaki, Yusuke (Tokyo) (1468) | Lost 0-2 | -191505 |
| average opponent: 1539record: 5-3 | new rating: 1505 | |||
| Grand Prix Hiroshima 2001 (INV limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 98 | Sato, Shinichi (1500) | Lost 0-2 | -181482 |
| 2sealed | 190 | Matsuoka, Takeshi (1481) | Lost 0-2 | -181464 |
| 3sealed | 194 | Yanada, Kazuki (1463) | Won 2-0 | +181482 |
| 4sealed | 176 | Higashi, Teppei (1482) | Lost 1-2 | -181464 |
| 5sealed | 157 | Yamane, Masahiro (1466) | Won 2-1 | +181482 |
| 6sealed | 129 | Kaneko, Takanori (1483) | Lost 0-2 | -181464 |
| average opponent: 1479record: 2-4 | new rating: 1464 | |||