Otsuka, Kotaro
Current rating: 1542
Record: 15-13
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1562 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 271 | Kimura, Yuichi (1427) | Lost 0-2 | -201542 |
| top | record: 0-1 | new rating: 1542 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1581 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 402 | Kazimoto, Atushi (1519) | Lost 0-2 | -191562 |
| top | record: 0-1 | new rating: 1562 | ||
| Grand Prix Utsunomiya 2002 (ONS rochester) | starting rating: 1563 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 99 | Seki, Yoshio (1564) | Won 2-0 | +181581 |
| 3sealed | 36 | Satou, Dai (1535) | Won 2-1 | +171598 |
| 4sealed | 25 | Mitsuya, Kazuhiko (1815) | Won 2-1 | +221620 |
| 5sealed | 15 | Matsunaga, Kazuki (1519) | Lost 1-2 | -201600 |
| 6sealed | 55 | Furuya, Masashi (1554) | Lost 1-2 | -191581 |
| top | average opponent: 1597record: 3-2 | new rating: 1581 | ||
| Grand Prix Shizuoka 2001 (ODY limited) | starting rating: 1507 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 155 | Hamano, Hidetoshi (1518) | Lost 0-2 | -181489 |
| 3sealed | 141 | Ito, Takahiro (1500) | Won 2-0 | +191508 |
| 4sealed | 175 | Miyazaki, Rintarou (1519) | Won 2-0 | +181526 |
| 5sealed | 110 | Matsuyama, Tomofumi (1462) | Won 2-0 | +171543 |
| 6sealed | 70 | Tatsumi, Tomohiro (1568) | Won 2-1 | +181561 |
| 7sealed | 28 | Ruel, Olivier (1662) | Lost 1-2 | -161545 |
| 8sealed | 66 | Maeda, Kota (1555) | Won 2-1 | +181563 |
| top | average opponent: 1541record: 5-2 | new rating: 1563 | ||
| Grand Prix Kobe 2001 (Invasion block) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 3block | 134 | Tajiri, Satoshi (1604) | Lost 0-2 | -161467 |
| 4block | 314 | Mori, Yukinari (1519) | Won 2-0 | +191486 |
| 5block | 129 | Eura, Hiroki (1487) | Won 2-1 | +181504 |
| 6block | 112 | Hasegawa, Takumi (1537) | Lost 1-2 | -171487 |
| 7block | 247 | Takubo, Yasuhiro (1500) | Won 2-0 | +181505 |
| 8block | 94 | Yoshizawa, Ryouji (1555) | Won 2-0 | +191524 |
| 9block | 52 | Komiya, Tadayoshi (1586) | Lost 0-2 | -171507 |
| top | average opponent: 1541record: 4-3 | new rating: 1507 | ||
| Grand Prix Kyoto 2000 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2extended | 101 | Nishio, Yoshiaki (1500) | Lost 0-2 | -181482 |
| 3extended | 268 | Morishita, Takeshin (1500) | Won 2-1 | +181500 |
| 4extended | 200 | Nishiwaki, Kenta (1518) | Lost 1-2 | -171483 |
| 5extended | 250 | Yamada, Yasuo (1483) | Lost 1-2 | -181465 |
| 6extended | 225 | Nakamura, Yoichi (1457) | Lost 0-2 | -181447 |
| 7extended | 225 | Nishioka, Junichiro (1464) | Won 2-0 | +181465 |
| 8extended | 184 | Ichikawa, Yasura (1482) | Won 2-1 | +181483 |
| top | average opponent: 1486record: 3-4 | new rating: 1483 | ||