Hoshi, Koutarou
Current rating: 1389
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1437 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 295 | Kamada, Chihiro (1462) | Lost 1-2 | -181419 |
| 2sealed | 295 | Tsushima, Shinichirou (1496) | Lost 0-2 | -161403 |
| 3sealed | 486 | Hayashi, Katsuji (1535) | Lost 0-2 | -161387 |
| 4sealed | 490 | Shibata, Takahiro (1443) | Won 2-0 | +191406 |
| 5sealed | 410 | Koide, Yuichi (1469) | Lost 0-2 | -171389 |
| top | average opponent: 1481record: 1-4 | new rating: 1389 | ||
| Grand Prix Nagoya 2014 (BNG limited) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 190 | Yanagawa, Hideyuki (1500) | Won 2-1 | +191482 |
| 2sealed | 182 | Inuzuka, Satoshi (1628) | Won 2-1 | +211503 |
| 3sealed | 48 | Arita, Koichi (1615) | Lost 0-2 | -161487 |
| 4sealed | 236 | Kokubun, Hiroshi (1525) | Lost 1-2 | -181469 |
| 5sealed | 317 | Wang, Peizhe (1665) | Lost 1-2 | -141455 |
| 6sealed | 294 | Nakayama, Satomi (1429) | Draw 1-1 | -11454 |
| 7sealed | 241 | Shindo, Noboru (1485) | Lost 0-2 | -171437 |
| top | average opponent: 1550record: 2-4-1 | new rating: 1437 | ||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 825 | Kuramochi, Takashi (1318) | Won 2-1 | +151515 |
| 2sealed | 864 | Kokawa, Tsunao (1518) | Won 2-0 | +181533 |
| 3sealed | 742 | Fujimoto, Katsuya (1597) | Lost 0-2 | -171516 |
| 4sealed | 924 | Takayama, Kan (1518) | Lost 0-2 | -181498 |
| 5sealed | 956 | Kim, Inhwan (1535) | Lost 0-2 | -171481 |
| 6sealed | 976 | Yanagawa, Tsubasa (1517) | Lost 0-2 | -181463 |
| top | average opponent: 1500record: 2-4 | new rating: 1463 | ||