Ishikka, Takehiro
Current rating: 1596
Record: 21-16-1
| Grand Prix Yokohama 2004 (COK limited) | starting rating: 1642 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 28 | Noguchi, Yuichiro (1598) | Lost 0-2 | -191623 |
| 3sealed | 147 | Sakurai, Yuu (1429) | Lost 1-2 | -221601 |
| 4sealed | 222 | Iioka, Kenta (1387) | Won 2-1 | +151616 |
| 5sealed | 203 | Tamura, Katsuhiko (1538) | Lost 0-2 | -201596 |
| top | average opponent: 1488record: 1-3 | new rating: 1596 | ||
| Grand Prix Sendai 2004 (DST limited) | starting rating: 1537 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 88 | Ito, Akitsugu (1782) | Won 2-1 | +221559 |
| 3sealed | 72 | Kuroda, Masashiro (2024) | Draw 1-1 | +81567 |
| 4sealed | 56 | Hamada, Yuusaku (1534) | Won 2-1 | +181585 |
| 5sealed | 29 | Kubota, Kenta (1578) | Lost 1-2 | -191566 |
| 6sealed | 67 | Fujita, Satoshi (1468) | Won 2-0 | +171583 |
| 7sealed | 43 | Mouri, Tomonori (1562) | Won 2-1 | +171600 |
| 8sealed | 24 | Iwano, Shuzo (1625) | Won 2-0 | +191619 |
| 9draft | 14 | Sasaki, Yusuke (Tokyo) (1648) | Lost 1-2 | -181601 |
| 10draft | 4 | Ino, Kentaro (1635) | Won 2-0 | +191620 |
| 11draft | 4 | Fukaishi, Takahiro (1577) | Won 2-0 | +171637 |
| 12draft | 7 | Asahara, Akira (1914) | Won 2-1 | +231660 |
| 13draft | 10 | Sogabe, Ippei (1643) | Lost 1-2 | -181642 |
| 14draft | 28 | Kikuchi, Satoru (1656) | ID | 01642 |
| top | average opponent: 1665record: 8-3-2 | new rating: 1642 | ||
| Grand Prix Shizuoka 2003 (MRD limited) | starting rating: 1541 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 203 | Hasegawa, Hironobu (1536) | Lost 0-2 | -191522 |
| 2sealed | 277 | Yano, Ryuji (1481) | Lost 0-2 | -181504 |
| 3sealed | 295 | Mizusaki, Yoshinobu (1464) | Won 2-0 | +171521 |
| 4sealed | 225 | Nagura, Yoshiyasu (1482) | Won 2-0 | +171538 |
| 5sealed | 164 | Suzuki, Ryuuichi (1531) | Won 2-1 | +181556 |
| 6sealed | 143 | Matsuyama, Satoshi (1485) | Lost 1-2 | -191537 |
| top | average opponent: 1497record: 3-3 | new rating: 1537 | ||
| Grand Prix Yokohama 2003 (Onslaught block) | starting rating: 1543 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 7 | Ohara, Yoshirou (1500) | Won 2-0 | +181561 |
| 2block | 33 | Terasawa, Kazuya (1730) | Lost 0-2 | -151546 |
| 3block | 201 | Yamaguchi, Tetsuya (1524) | Won 2-1 | +171563 |
| 4block | 200 | Okada, Wataru (1532) | Lost 0-2 | -181545 |
| 5block | 254 | Ootagaki, Mitsushige (1485) | Won 2-0 | +171562 |
| 6block | 191 | Tsuji, Hisanao (1510) | Lost 0-2 | -191543 |
| 7block | 215 | Ikeda, Takashi (1485) | Lost 1-2 | -191524 |
| 8block | 230 | Suzuki, Yasutomo (1462) | Won 2-0 | +171541 |
| top | average opponent: 1529record: 4-4 | new rating: 1541 | ||
| Grand Prix Kyoto 2003 (LGN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 200 | Mori, Yuuya (1500) | Won 2-0 | +181518 |
| 2sealed | 119 | Watanabe, Keita (1636) | Won 2-1 | +201538 |
| 3sealed | 42 | Ogawa, Syunsuke (1701) | Won 2-1 | +211559 |
| 4sealed | 51 | Kataoka, Kazuyuki (1521) | Lost 0-2 | -191540 |
| 5sealed | 103 | Takasaki, Yuichi (1632) | Lost 0-2 | -161524 |
| 6sealed | 112 | Uesugi, Zenkyou (1520) | Won 2-1 | +181542 |
| 7sealed | 105 | Yun, Suhan (1621) | Won 2-0 | +191561 |
| 8sealed | 135 | Omori, Kazuto (1562) | Lost 0-2 | -181543 |
| top | average opponent: 1587record: 5-3 | new rating: 1543 | ||