Ishii, Kouki
Current rating: 1553
Record: 10-7
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1554 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 449 | Arce, Aaron (1567) | Won 2-0 | +181572 |
| 2sealed | 333 | Mukai, Hiroaki (1626) | Lost 1-2 | -171555 |
| 3sealed | 808 | Sasaki, Shota (1501) | Won 2-0 | +171572 |
| 4sealed | 561 | Narumi, Masaru (1317) | Won 2-0 | +141586 |
| 5sealed | 425 | Yamazaki, Yuki (1526) | Lost 0-2 | -201566 |
| 6sealed | 430 | Hirabayashi, Yuki (1563) | Lost 1-2 | -181548 |
| 7sealed | 609 | Yamagiwa, Shimpei (1502) | Won 2-0 | +181566 |
| 8sealed | 412 | Nuruki, Hiroaki (1869) | Lost 0-2 | -131553 |
| average opponent: 1559record: 4-4 | new rating: 1553 | |||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 894 | S., Yuuzou (1500) | Won 2-0 | +181518 |
| 2sealed | 745 | Matsuda, Kenji (1480) | Won 2-1 | +171535 |
| 3sealed | 689 | Kanetuna, Yoshinori (1505) | Lost 0-2 | -181517 |
| 4sealed | 853 | Kunisato, Ebie (1630) | Won 2-1 | +201537 |
| 5sealed | 738 | Harada, Masato (1535) | Lost 0-2 | -181519 |
| 6sealed | 828 | Watson, Brendan (1458) | Won 2-0 | +171536 |
| 7sealed | 768 | Naitou, Keisuke (1660) | Lost 1-2 | -161520 |
| 8sealed | 992 | Takahashi, Akihiro (1472) | Won 2-0 | +171537 |
| 9sealed | 951 | Ma, Kun (1468) | Won 2-0 | +171554 |
| average opponent: 1523record: 6-3 | new rating: 1554 | |||