Ishikawa, Shigeru
Current rating: 1410
| Grand Prix Yokohama 2019 (modern) | starting rating: 1423 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 270 | Miura, Haku (1414) | Won 2-0 | +181441 |
| 2modern | 384 | Koike, Tomoyuki (1402) | Lost 1-2 | -191422 |
| 3modern | 672 | Yin, Hongrui (1598) | Lost 0-2 | -151407 |
| 4modern | 1004 | Tanaka, Toshiaki (1478) | Won 2-1 | +191426 |
| 5modern | 554 | Mochizuki, Yosuke (1514) | Lost 0-2 | -161410 |
| top | average opponent: 1481record: 2-3 | new rating: 1410 | ||
| Grand Prix Shizuoka 2018 (standard) (GRN standard) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 716 | Ishiguro, Yasunao (1459) | Draw 1-1 | -11481 |
| 2standard | 669 | Sasagawa, Hitoshi (1513) | Lost 0-2 | -171464 |
| 3standard | 981 | Shimizu, Takafumi (1381) | Lost 0-2 | -201444 |
| 4standard | 1036 | Garcia, Victor (1472) | Lost 1-2 | -171427 |
| 5standard | 1008 | Gokan, Yuta (1404) | Won 2-0 | +171444 |
| 6standard | 881 | Kimura, Yuu1332 (1379) | Draw 1-1 | -11443 |
| 7standard | 804 | Usami, Koji (1299) | Lost 0-2 | -201423 |
| top | average opponent: 1415record: 1-4-2 | new rating: 1423 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 633 | Kawasaki, Kentaro (1500) | Lost 0-2 | -181482 |
| 2sealed | 928 | Mukai, Shinichi (1414) | Won 2-1 | +171499 |
| 3sealed | 726 | Nakamura, Naoki (1417) | Won 2-0 | +161515 |
| 4sealed | 445 | Takeishi, Kouji (1689) | Lost 1-2 | -151500 |
| 5sealed | 583 | Nishiyama, Shinosuke (1464) | Lost 0-2 | -181482 |
| top | average opponent: 1497record: 2-3 | new rating: 1482 | ||