Kotajima, Yasuhiro
Current rating: 1545
Record: 18-16-3
| Grand Prix Yokohama 2004 (COK limited) | starting rating: 1493 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 16 | Sakamoto, Yuki (1570) | Won 2-1 | +191512 |
| 2sealed | 57 | Nakajima, Hiroki (1485) | Won 2-1 | +181530 |
| 3sealed | 77 | Taniguchi, Manabu (1510) | Won 2-0 | +181548 |
| 4sealed | 48 | Umezawa, Shinobu (1558) | Lost 0-2 | -181530 |
| 5sealed | 43 | Osaka, Yusuke (1699) | Won 2-1 | +211551 |
| 6sealed | 84 | Higaki, Takao (1750) | Won 2-0 | +211572 |
| 7sealed | 32 | Mutou, Kouhei (1689) | Won 2-0 | +211593 |
| 8sealed | 50 | Kaplan, Lain (1706) | ID | 01593 |
| 9rochester | 24 | Takasaki, Yuichi (1651) | Lost 0-2 | -171576 |
| 10rochester | 25 | Shirakura, Tsuyoshi (1637) | Lost 0-2 | -171559 |
| 11rochester | 15 | Shiwaku, Tsuyoshi (1624) | Lost 1-2 | -171542 |
| 12rochester | 30 | Kubota, Kenta (1661) | Won 2-1 | +201562 |
| 13rochester | 14 | Saito, Tomoya (1540) | Lost 1-2 | -181544 |
| 14rochester | 9 | Kashima, Akihiro (1615) | Draw 1-1 | +11545 |
| top | average opponent: 1621record: 7-5-2 | new rating: 1545 | ||
| Grand Prix Shizuoka 2003 (MRD limited) | starting rating: 1551 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 71 | Goto, Kosuke (1639) | Lost 1-2 | -171534 |
| 2sealed | 210 | Kuramochi, Yoshinori (1483) | Lost 1-2 | -191515 |
| 3sealed | 276 | Sato, Taichi (1464) | Draw 1-1 | -11514 |
| 4sealed | 273 | Kim, Chun-Ho (1464) | Won 2-0 | +181532 |
| 5sealed | 211 | Tanaka, Takayuki (1500) | Lost 1-2 | -191513 |
| 6sealed | 190 | Katsumata, Yuuma (1465) | Won 2-0 | +171530 |
| 7sealed | 140 | Yorifuji, Hideyuki (1513) | Lost 0-2 | -181512 |
| 8sealed | 126 | Kuroi, Tadashi (1472) | Lost 0-2 | -191493 |
| top | average opponent: 1500record: 2-5-1 | new rating: 1493 | ||
| Grand Prix Yokohama 2003 (Onslaught block) | starting rating: 1517 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 18 | Gunji, Toshiyuki (1500) | Won 2-0 | +181535 |
| 2block | 146 | Shinohara, Naoyuki (1518) | Lost 1-2 | -191516 |
| 3block | 158 | Okamura, Shinya (1492) | Won 2-1 | +181534 |
| 4block | 169 | Sumitomo, Hiroyuki (1505) | Lost 0-2 | -191515 |
| 5block | 193 | Date, Norikuni (1499) | Won 2-1 | +181533 |
| 6block | 205 | Nakatani, Haruki (1557) | Won 2-0 | +191552 |
| 7block | 89 | Izumi, Shinji (1518) | Lost 1-2 | -191533 |
| 8block | 184 | Toshimi, Hirokazu (1518) | Won 2-0 | +181551 |
| top | average opponent: 1514record: 5-3 | new rating: 1551 | ||
| Grand Prix Shizuoka 2001 (ODY limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 223 | Sonomura, Yuusuke (1500) | Lost 0-2 | -181482 |
| 2sealed | 282 | Watanabe, Taiki (1481) | Won 1-0 | +181500 |
| 3sealed | 165 | Suzuki, Gou (1500) | Won 2-0 | +181518 |
| 4sealed | 82 | Furujou, Takashi (1534) | Won 1-0 | +181536 |
| 5sealed | 76 | Maeno, Ryuju (1534) | Draw 1-1 | 01536 |
| 6sealed | 89 | Kurita, Daisuke (1564) | Won 2-0 | +191555 |
| 7sealed | 54 | Sakakibara, Satoshi (1459) | Lost 0-2 | -201535 |
| 8sealed | 89 | Yamashita, Ryosuke (1537) | Lost 0-2 | -181517 |
| top | average opponent: 1514record: 4-3-1 | new rating: 1517 | ||