Onta, Hirofumi
Current rating: 1286
Record: 9-23-1
| Grand Prix Hiroshima 2006 (CSP limited) | starting rating: 1362 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 23 | Nakagawa, Yu (1480) | Lost 0-2 | -161346 |
| 2sealed | 137 | Okita, Yuji (1552) | Lost 1-2 | -141332 |
| 3sealed | 151 | Shigehara, Akinori (1454) | Won 2-0 | +201352 |
| 4sealed | 167 | Takahashi, Jun ya (1471) | Lost 0-2 | -161336 |
| 5sealed | 149 | Fujimoto, Takehiro (Osaka) (1432) | Lost 0-2 | -161320 |
| 6sealed | 131 | Masuyama, Yuko (1354) | Lost 1-2 | -181302 |
| 7sealed | 56 | Yamasaki, Sadaharu (1369) | Lost 0-2 | -161286 |
| top | average opponent: 1444record: 1-6 | new rating: 1286 | ||
| Grand Prix Niigata 2005 (Kamigawa block) | starting rating: 1406 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 36 | Wakae, Akio (1387) | Won 1-0 | +171423 |
| 2block | 41 | Terasawa, Kazuya (1758) | Lost 1-2 | -121411 |
| 3block | 162 | Oohashi, Toshiya (1460) | Lost 1-2 | -171394 |
| 4block | 186 | Nishimaki, Akira (1521) | Lost 1-2 | -161378 |
| 5block | 195 | Sasagawa, Kentaro (1463) | Lost 0-2 | -161362 |
| top | average opponent: 1518record: 1-4 | new rating: 1362 | ||
| Grand Prix Sendai 2004 (DST limited) | starting rating: 1435 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 62 | Watanabe, Masami (1432) | Won 2-1 | +181453 |
| 2sealed | 24 | Sogabe, Ippei (1518) | Lost 0-2 | -171436 |
| 3sealed | 116 | Teramoto, Shoji (1530) | Lost 0-2 | -161420 |
| 4sealed | 189 | Tanahashi, Masayasu (1503) | Lost 0-2 | -171403 |
| 5sealed | 207 | Miyoi, Shunta (1468) | Lost 1-2 | -171386 |
| 6sealed | 176 | Fujimura, Kyuta (1452) | Won 2-0 | +201406 |
| top | average opponent: 1484record: 2-4 | new rating: 1406 | ||
| Grand Prix Yokohama 2003 (Onslaught block) | starting rating: 1447 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 122 | Sakamoto, Sakito (1500) | Won 2-0 | +181465 |
| 2block | 101 | Doi, Asuka (1504) | Lost 0-2 | -171448 |
| 3block | 175 | Kondo, Takahito (1473) | Won 2-0 | +191467 |
| 4block | 113 | Murata, Shohei (1499) | Lost 0-2 | -181449 |
| 5block | 256 | Abe, Satoshi (1498) | Lost 1-2 | -171432 |
| 6block | 246 | Watanabe, Taketoshi (1481) | Won 2-1 | +191451 |
| 7block | 197 | Lee, Hyun Wook (1509) | Lost 0-2 | -171434 |
| 8block | 210 | Fujimoto, Keiji (1480) | Draw 1-1 | +11435 |
| top | average opponent: 1493record: 3-4-1 | new rating: 1435 | ||
| Grand Prix Sapporo 2002 (Odyssey block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 45 | Oshima, Meguru (1500) | Lost 0-2 | -181482 |
| 2block | 146 | Oikawa, Hakudou (1483) | Lost 0-2 | -181464 |
| 3block | 191 | Fujisawa, Hiroki (1465) | Won 2-0 | +181482 |
| 4block | 190 | Eura, Hiroki (1447) | Lost 0-2 | -191463 |
| 5block | 176 | Furuichi, Takenori (1523) | Lost 0-2 | -171446 |
| 6block | 172 | Yoshino, Fumihito (1447) | Won 2-0 | +181464 |
| 7block | 132 | Goto, Yoshiharu (1466) | Lost 0-2 | -171447 |
| top | average opponent: 1476record: 2-5 | new rating: 1447 | ||