Hattori, Keitarou
Current rating: 1462
Record: 13-14-2 (GP) / 2-5 (professional)
| Grand Prix Hiroshima 2006 (CSP limited) | starting rating: 1466 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 59 | Goto, Kosuke (1662) | Won 2-1 | +221488 |
| 3sealed | 34 | Kobara, Shinji (1463) | Lost 0-2 | -191469 |
| 4sealed | 63 | Samiso, Yutaka (1500) | Won 2-0 | +191488 |
| 5sealed | 66 | Shimada, Hiroya (1551) | Won 2-0 | +191507 |
| 6sealed | 29 | Shiozu, Ryouma (1835) | Lost 1-2 | -121495 |
| 7sealed | 68 | Ishizaki, Ryousuke (1487) | Lost 1-2 | -181477 |
| 8sealed | 34 | Chijimi, Keiichi (1673) | Lost 1-2 | -151462 |
| top | average opponent: 1596record: 3-4 | new rating: 1462 | ||
| Grand Prix Sendai 2004 (DST limited) | starting rating: 1442 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 37 | Miyabe, Kouichi (1585) | Won 2-0 | +211463 |
| 2sealed | 132 | Shibata, Yuuki (1561) | Draw 1-1 | +21465 |
| 3sealed | 90 | Hamada, Yuusaku (1517) | Lost 0-2 | -171448 |
| 4sealed | 161 | Watanabe, Junko (1465) | Lost 0-2 | -181430 |
| 5sealed | 187 | Sato, Daisuke (1399) | Won 2-0 | +171447 |
| 6sealed | 137 | Suzuki, Gou (1445) | Won 2-1 | +181465 |
| 7sealed | 101 | Ishiduka, Hazime (1486) | Won 2-1 | +191484 |
| 8sealed | 66 | Ozaki, Hironori (1518) | Lost 0-2 | -181466 |
| top | average opponent: 1497record: 4-3-1 | new rating: 1466 | ||
| Pro Tour Yokohama 2003 (LGN draft) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 1draft | 57 | Leroy, Florian (1503) | Won 2-0 | +181501 |
| 2draft | 33 | Stivoli, Federico (1518) | Lost 1-2 | -171484 |
| 3draft | 24 | Borys, Grzegorz (1630) | Won 2-1 | +201504 |
| 4draft | 64 | Harding, Oyvind (1664) | Lost 1-2 | -151489 |
| 5draft | 37 | Becker, Jonathan (1746) | Lost 0-2 | -131476 |
| 6draft | 8 | Sibast, Rasmus (1468) | Lost 1-2 | -181458 |
| 7draft | 80 | Sottosanti, Paul (1607) | Lost 0-2 | -161442 |
| top | average opponent: 1591record: 2-5 | new rating: 1442 | ||
| Grand Prix Hiroshima 2001 (INV limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 6 | Miyamori, Masaei (1500) | Won 2-0 | +181518 |
| 2sealed | 99 | Yaguchi, Kanzo (1551) | Won 2-0 | +191537 |
| 3sealed | 19 | Nonishi, Keiichiro (1554) | Lost 0-2 | -181519 |
| 4sealed | 51 | Mayuzumi, Shinichi (1552) | Lost 0-2 | -181501 |
| 5sealed | 123 | Uematsu, Kouichi (1469) | Lost 1-2 | -181483 |
| 6sealed | 123 | Ishii, Yoshimasa (1481) | Won 2-0 | +181501 |
| 7sealed | 96 | Murakami, Norichika (1501) | Lost 1-2 | -181483 |
| top | average opponent: 1516record: 3-4 | new rating: 1483 | ||
| Grand Prix Sapporo 2000 (PCY limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 34 | Akamatsu, Yoshiki (1500) | Draw 1-1 | 01500 |
| 2sealed | 65 | Tsushima, Yusuke (1500) | Lost 1-2 | -181482 |
| 3sealed | 103 | Nomura, Eiji (1482) | Won 2-1 | +181500 |
| 4sealed | 89 | Takamori, Atsushi (1499) | Lost 1-2 | -181482 |
| 5sealed | 99 | Abe, Masahide (1482) | Won 2-0 | +181500 |
| 6sealed | 84 | Miyazaki, Junpei (1500) | Lost 1-2 | -181482 |
| 7sealed | 85 | Kawaguchi, Naoki (1482) | Won 2-0 | +181500 |
| top | average opponent: 1492record: 3-3-1 | new rating: 1500 | ||