Koshinuma, Kei
Current rating: 1417
Record: 4-9
| Grand Prix Shizuoka 2013 (THS standard) | starting rating: 1429 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 253 | Sakaki, Yusuke (1482) | Lost 0-2 | -171412 |
| 2standard | 303 | Yuasa, Kentarou (1618) | Lost 0-2 | -141398 |
| 3standard | 415 | Shibata, Yasumasa (1459) | Won 2-1 | +191417 |
| top | average opponent: 1519record: 1-2 | new rating: 1417 | ||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1015 | Gotou, Atsushi (1511) | Won 2-0 | +191483 |
| 2sealed | 912 | Kimura, Hidemasa (1517) | Lost 0-2 | -171466 |
| 3sealed | 1017 | Yoshida, Hajime (1500) | Lost 0-2 | -181448 |
| 4sealed | 1049 | Komatsu, Satoru (1380) | Lost 0-2 | -191429 |
| top | average opponent: 1477record: 1-3 | new rating: 1429 | ||
| Grand Prix Nagoya 2012 (RTR standard) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 185 | Matsubara, Hitoshi (1500) | Lost 0-2 | -181463 |
| 2standard | 590 | Imura, Hajime (1482) | Won 2-1 | +191482 |
| 3standard | 617 | Ashizawa, Yoshisato (1505) | Lost 1-2 | -181464 |
| top | average opponent: 1496record: 1-2 | new rating: 1464 | ||
| Grand Prix Yokohama 2012 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 159 | Kurusu, Kazuki (1597) | Won 2-1 | +201520 |
| 2modern | 142 | Otani, Makoto (1380) | Lost 1-2 | -211499 |
| 3modern | 518 | Sano, Keisuke (1482) | Lost 0-2 | -181481 |
| top | average opponent: 1486record: 1-2 | new rating: 1481 | ||