Koguchi, Yasuaki
Current rating: 1536
| Grand Prix Kyoto 2003 (LGN limited) | starting rating: 1532 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 1 | Yamazaki, Hiroki (1605) | Won 2-0 | +191551 |
| 4sealed | 19 | Kurushima, Kouji (1574) | Lost 1-2 | -171534 |
| 5sealed | 64 | Yanagi, Hiroki (1508) | Won 2-1 | +171551 |
| 6sealed | 69 | Wada, Atsushi (1553) | Lost 1-2 | -181533 |
| 7sealed | 62 | Yamahara, Toshihisa (1626) | Won 2-0 | +201553 |
| 8sealed | 48 | Osawa, Takuya (1611) | Lost 0-2 | -171536 |
| top | average opponent: 1580record: 3-3 | new rating: 1536 | ||
| Grand Prix Sapporo 2002 (Odyssey block) | starting rating: 1516 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 62 | Maeda, Hisanori (1500) | Won 2-0 | +181534 |
| 2block | 6 | Takahashi, Ikuto (1518) | Lost 0-2 | -181516 |
| 3block | 144 | Nagata, Masafumi (1502) | Won 2-0 | +171533 |
| 4block | 97 | Osanai, Yuki (1516) | Won 2-0 | +181551 |
| 5block | 47 | Ueno, Mitsuru (1509) | Lost 1-2 | -191532 |
| 6block | 106 | Kinoshita, Tomoya (1513) | Won 2-0 | +181550 |
| 7block | 53 | Akahira, Shingo (1535) | Lost 0-2 | -181532 |
| top | average opponent: 1513record: 4-3 | new rating: 1532 | ||
| Grand Prix Shizuoka 2001 (ODY limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 36 | Goto, Seiji (1394) | Won 2-0 | +161516 |
| 2sealed | 112 | Ono, Takenori (1518) | Won 2-0 | +181534 |
| 3sealed | 85 | Kurono, Kiyotoshi (1518) | Won 2-1 | +181552 |
| 4sealed | 41 | Yagi, Akira (1488) | Lost 1-2 | -191533 |
| 5sealed | 98 | Maeda, Hideki (1568) | Won 2-0 | +181551 |
| 6sealed | 62 | Ito, Akitsugu (1604) | Lost 1-2 | -171534 |
| 7sealed | 107 | Honami, Shuichi (1536) | Lost 1-2 | -181516 |
| top | average opponent: 1518record: 4-3 | new rating: 1516 | ||