Yamaguchi, Kei
Current rating: 1520
Record: 16-15-3
| Grand Prix Kyoto 2007 (PLC standard) | starting rating: 1498 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 11 | Samiso, Yutaka (1502) | Lost 1-2 | -181480 |
| 2standard | 270 | Matsuda, Hironori (1482) | Won 2-0 | +181498 |
| 3standard | 217 | Higashi, Yukihiro (1500) | Won 2-1 | +181516 |
| 4standard | 152 | Takeuchi, Shuuji (1517) | Won 2-1 | +181534 |
| 5standard | 115 | Murasawa, Yuuya (1484) | Lost 1-2 | -191515 |
| 6standard | 202 | Yamamoto, Akimasa (1605) | Lost 1-2 | -161499 |
| 7standard | 188 | Nakagawa, Yukihiro (1640) | Won 2-0 | +201519 |
| 8standard | 138 | Sugama, Hideichi (1544) | Lost 1-2 | -171502 |
| 9standard | 149 | Minoue, Hiroyuki (1515) | Won 2-0 | +181520 |
| top | average opponent: 1532record: 5-4 | new rating: 1520 | ||
| Grand Prix Niigata 2005 (Kamigawa block) | starting rating: 1499 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 31 | Shimizu, Hajime (1578) | Lost 0-2 | -171482 |
| 2block | 147 | Inoue, Masafumi (1482) | Won 2-0 | +181500 |
| 3block | 122 | Se, Atsuo (1396) | Won 2-0 | +161516 |
| 4block | 117 | Tanahashi, Masayasu (1556) | Lost 0-2 | -171499 |
| 5block | 175 | Hiroki, Kenta (1461) | Lost 0-2 | -191480 |
| 6block | 160 | Iioka, Kayoko (1439) | Won 2-1 | +171497 |
| 7block | 124 | Miura, Akiyoshi (1511) | Lost 0-2 | -171480 |
| 8block | 115 | Obara, Takahiro (1500) | Won 1-0 | +181498 |
| top | average opponent: 1490record: 4-4 | new rating: 1498 | ||
| Grand Prix Nagoya 2004 (5DN standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 232 | Murasawa, Yuuya (1507) | Draw 1-1 | 01500 |
| 2standard | 247 | Kato, Keiichi (1499) | Won 2-0 | +181518 |
| 3standard | 171 | Ishikawa, Masayo (1488) | Draw 1-1 | -11517 |
| 4standard | 297 | Fukuhara, Taiki (1518) | Lost 1-2 | -181499 |
| 5standard | 349 | Tanie, Junya (1500) | Won 2-0 | +181517 |
| 6standard | 267 | Honnami, Tomoyuki (1487) | Lost 1-2 | -181499 |
| 7standard | 267 | Mori, Koutarou (1501) | Won 2-0 | +181517 |
| 8standard | 203 | Adachi, Takeshi (1515) | Lost 1-2 | -181499 |
| 9standard | 185 | Suginaka, Toshio (1488) | Draw 1-1 | 01499 |
| top | average opponent: 1500record: 3-3-3 | new rating: 1499 | ||
| Grand Prix Yokohama 2003 (Onslaught block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 39 | Katsumata, Yoshihisa (1500) | Lost 1-2 | -181482 |
| 2block | 274 | Morita, Yohei (1482) | Lost 1-2 | -181464 |
| 3block | 338 | Kudo, Hiroshi (1464) | Lost 1-2 | -181446 |
| 4block | 373 | Iida, Shingo (1447) | Won 1-0 | +181464 |
| 5block | 330 | Kaneko, Kazunari (1466) | Won 2-1 | +181482 |
| 6block | 290 | Kodama, Hironori (1465) | Won 2-1 | +181500 |
| 7block | 222 | Iwamoto, Gohki (1497) | Lost 0-2 | -181482 |
| 8block | 208 | Teramoto, Shoji (1484) | Won 1-0 | +181500 |
| top | average opponent: 1476record: 4-4 | new rating: 1500 | ||