Katayama, Koujun
Current rating: 1538
Record: 12-11
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1433 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 651 | Davis, Dillon (1500) | Won 2-0 | +191452 |
| 2sealed | 510 | Nishihara, Hiroki (1620) | Lost 1-2 | -151437 |
| 3sealed | 866 | Murase, Motonori (1438) | Lost 0-2 | -181419 |
| 4sealed | 1047 | Nomura, Hiroshi (1486) | Lost 0-2 | -171402 |
| 5sealed | 1086 | Tamano, Yuuki (1498) | Won 2-1 | +201422 |
| 6sealed | 840 | Moya Pinero, Miquel Angel (1473) | Won 2-1 | +191441 |
| 7sealed | 778 | Sakurai, Atsushi (1523) | Won 2-1 | +191460 |
| 8sealed | 460 | Kubomura, Masaaki (1403) | Won 2-1 | +171477 |
| 9sealed | 299 | Watanabe, Takefumi (1594) | Won 2-0 | +201497 |
| 10draft | 94 | Takeda, Yoshihide (1500) | Won 2-0 | +191516 |
| 11draft | 92 | Kamimura, Tomoyuki (1578) | Won 2-0 | +191535 |
| 12draft | 87 | Matsushita, Masayoshi (1580) | Won 2-1 | +181553 |
| 13draft | 177 | Ma, Geoff (1687) | Lost 1-2 | -151538 |
| top | average opponent: 1529record: 9-4 | new rating: 1538 | ||
| Grand Prix Kobe 2015 (BFZ standard) | starting rating: 1450 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 83 | Fujii, Tomoyuki (1500) | Lost 0-2 | -171433 |
| top | record: 0-1 | new rating: 1433 | ||
| Grand Prix Okayama 2004 (extended) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 79 | Suzuki, Keiji (1480) | Won 2-0 | +181500 |
| 2extended | 10 | Komiyama, Hideki (1592) | Lost 0-2 | -161484 |
| 3extended | 134 | Hiraoka, Toshiaki (1570) | Lost 0-1 | -161468 |
| 4extended | 170 | Satou, Kiminori (1482) | Lost 0-2 | -181450 |
| top | average opponent: 1531record: 1-3 | new rating: 1450 | ||
| Grand Prix Hiroshima 2003 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 5 | Shiba, Norihito (1481) | Lost 1-2 | -181482 |
| 2extended | 125 | Ikedo, Masakazu (1482) | Lost 0-2 | -181464 |
| 3extended | 166 | Kawabata, Tomoyuki (1482) | Won 2-1 | +181482 |
| 4extended | 177 | Masamura, Ayumu (1469) | Won 2-0 | +181500 |
| 5extended | 121 | Hada, Mikio (1532) | Lost 0-2 | -181482 |
| top | average opponent: 1489record: 2-3 | new rating: 1482 | ||