Hayakawa, Idzumi
Current rating: 1381
Record: 2-9
| Grand Prix Yokohama 2004 (COK limited) | starting rating: 1427 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 125 | Yanagisawa, Tadahiro (1572) | Lost 1-2 | -151412 |
| 2sealed | 202 | Iizuka, Tsuyoshi (1483) | Lost 0-2 | -171395 |
| 3sealed | 278 | Tomioka, Shota (1463) | Lost 1-2 | -161379 |
| 4sealed | 286 | Fujisawa, Takashi (1445) | Lost 1-2 | -171362 |
| 5sealed | 245 | Yasuda, Takuo (1445) | Won 2-1 | +191381 |
| average opponent: 1482record: 1-4 | new rating: 1381 | |||
| Grand Prix Yokohama 2003 (Onslaught block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 230 | Noji, Keniti (1500) | Lost 0-2 | -181482 |
| 2block | 339 | Miyauchi, Makoto (1482) | Lost 0-2 | -181464 |
| 3block | 339 | Mukai, Kuniteru (1466) | Lost 1-2 | -181446 |
| 4block | 379 | Tate, Yosinobu (1445) | Won 2-0 | +181464 |
| 5block | 351 | Ishikawa, Ryota (1430) | Lost 1-2 | -191445 |
| 6block | 332 | Takahashi, Naoyuki (1447) | Lost 0-2 | -181427 |
| average opponent: 1462record: 1-5 | new rating: 1427 | |||