Ishihara, Akiho
Current rating: 1467
Record: 6-8
| Grand Prix Yokohama 2012 (modern) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 308 | Hosoda, Daiki (1446) | Lost 1-2 | -181445 |
| 2modern | 566 | Hayashi, Masahito (1489) | Won 2-0 | +191464 |
| 3modern | 496 | Yazu, Yasuhiro (1502) | Lost 0-2 | -171447 |
| 4modern | 583 | Kokubun, Takeshi (1476) | Won 2-0 | +181465 |
| 5modern | 359 | Kira, Ryouichi (1487) | Won 2-0 | +191484 |
| 6modern | 382 | Okano, Hiroki (1586) | Lost 0-2 | -171467 |
| average opponent: 1497record: 3-3 | new rating: 1467 | |||
| Grand Prix Yokohama 2010 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 386 | Shiraishi, Ryou (1583) | Won 2-1 | +201520 |
| 2extended | 240 | Gouda, Fumito (1517) | Won 2-1 | +171537 |
| 3extended | 129 | Kou, Changsu (1641) | Lost 1-2 | -161521 |
| 4extended | 198 | Mitome, Hiroumi (1517) | Lost 1-2 | -181503 |
| 5extended | 275 | Itou, Kouei (1484) | Lost 1-2 | -181485 |
| 6extended | 321 | Amayasu, Kazunori (1441) | Lost 1-2 | -191466 |
| 7extended | 268 | Yamasaki, Sadaharu (1316) | Won 2-1 | +151481 |
| 8extended | 206 | Ohshiba, Atsushi (1481) | Lost 1-2 | -181463 |
| average opponent: 1498record: 3-5 | new rating: 1463 | |||