Gu, JaChoon
Current rating: 1483
Record: 2-3
| Grand Prix Yokohama 2010 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 225 | Shimizu, Ryo (1496) | Won 2-0 | +181518 |
| 2extended | 168 | Hayashi, Masataka (1430) | Lost 0-2 | -201498 |
| 3extended | 293 | Kobashigawa, Davin (1500) | Won 2-0 | +181516 |
| 4extended | 293 | Ogawa, Masato (1514) | Lost 0-2 | -181498 |
| 5extended | 353 | Suzuki, Fumito (1655) | Lost 1-2 | -151483 |
| average opponent: 1519record: 2-3 | new rating: 1483 | |||