Koishihara, Akira
Current rating: 1457
Record: 9-12-1
| Grand Prix Shizuoka 2013 (THS standard) | starting rating: 1414 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 694 | Oobayashi, Naoki (1487) | Won 2-1 | +191433 |
| 3standard | 510 | Mizuno, Nobuyoshi (1541) | Lost 1-2 | -161417 |
| 4standard | 646 | Yamaguchi, Yuuki (1449) | Won 2-1 | +191436 |
| 5standard | 644 | Okamura, Kazuyoshi (1533) | Won 2-0 | +191455 |
| 6standard | 605 | Minoshima, Takenori (1417) | Lost 0-2 | -181437 |
| 7standard | 633 | Takahashi, Osamu (1466) | Lost 0-2 | -181419 |
| 8standard | 699 | Tsuda, Takanori (1410) | Won 2-1 | +181437 |
| 9standard | 728 | Ishiguro, Kenta (1529) | Won 2-0 | +201457 |
| top | average opponent: 1479record: 5-3 | new rating: 1457 | ||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1447 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 819 | Nakakura, Satoshi (1500) | Draw 1-1 | +11448 |
| 2sealed | 936 | Arai, Yuuki (1500) | Lost 0-2 | -171431 |
| 3sealed | 1076 | Syouta, Takeya (1482) | Lost 0-2 | -171414 |
| top | average opponent: 1494record: 0-2-1 | new rating: 1414 | ||
| Grand Prix Nagoya 2012 (RTR standard) | starting rating: 1502 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 293 | Hirayama, Shigetaka (1446) | Lost 1-2 | -191483 |
| 3standard | 525 | Nishi, Yohei (1463) | Lost 1-2 | -191464 |
| 4standard | 637 | Okumura, Shuuhei (1484) | Lost 1-2 | -171447 |
| top | average opponent: 1464record: 0-3 | new rating: 1447 | ||
| Grand Prix Yokohama 2012 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 343 | Matsumoto, Kazuo (1465) | Won 2-0 | +171517 |
| 2modern | 307 | Chiba, Shou (1472) | Lost 1-2 | -181499 |
| 3modern | 570 | Tamura, Yasuo (1426) | Lost 0-2 | -201479 |
| 4modern | 576 | Watanabe, Takefumi (1482) | Won 2-0 | +181497 |
| 5modern | 473 | Honpo, Takuma (1483) | Won 2-0 | +181515 |
| 6modern | 404 | Choi, Young-Il (1466) | Won 2-0 | +171532 |
| 7modern | 195 | Ozawa, Takeshi (1838) | Lost 1-2 | -121520 |
| 8modern | 239 | Yamaguchi, Tetsuya (1535) | Lost 1-2 | -181502 |
| top | average opponent: 1521record: 4-4 | new rating: 1502 | ||