Koseki, Daisuke
Current rating: 1544
| Grand Prix Yokohama 2019 (modern) | starting rating: 1582 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 556 | Nagami, Youichi (1633) | Lost 0-2 | -171565 |
| 2modern | 686 | Takanohashi, Tatsuya (1401) | Won 2-0 | +151580 |
| 3modern | 770 | Ishii, Kuya (1567) | Lost 0-2 | -181562 |
| 4modern | 895 | Fujimura, Kyuta (1485) | Won 2-0 | +171579 |
| 5modern | 699 | Popitukgul, Sutipong (1693) | Lost 1-2 | -161563 |
| 6modern | 773 | Nishikawa, Tatsuya 9163 (1527) | Lost 0-2 | -191544 |
| top | average opponent: 1551record: 2-4 | new rating: 1544 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1576 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 293 | Shiba, Joutarou (1445) | Won 2-1 | +161592 |
| 2standard | 18 | Kubota, Katsuma (1507) | Lost 1-2 | -201572 |
| 3standard | 980 | Sano, Hokuto (1505) | Lost 1-2 | -191553 |
| 4standard | 1295 | Ota, Sho (1585) | Won 2-1 | +191572 |
| 5standard | 1005 | Yamagata, Kouhei (1495) | Won 2-1 | +161588 |
| 6standard | 728 | Nishi, Daichi (1492) | Won 2-1 | +171605 |
| 7standard | 665 | Hirase, Gun (1505) | Lost 1-2 | -201585 |
| 8standard | 576 | Takeda, Daisuke (1520) | Lost 1-2 | -191566 |
| 9standard | 783 | Ishikawa, Tomohiko (1495) | Won 2-1 | +161582 |
| top | average opponent: 1505record: 5-4 | new rating: 1582 | ||
| Grand Prix Kobe 2015 (BFZ standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 436 | Inoue, Takuya (1480) | Won 2-1 | +181518 |
| 2standard | 384 | Sugimoto, Yuuki (1632) | Lost 0-2 | -161502 |
| 3standard | 825 | Yotsumoto, Yuki (1893) | Draw 1-1 | +71509 |
| 4standard | 846 | Suzuki, Kenta7482 (1495) | Won 2-0 | +171526 |
| 5standard | 584 | Higashi, Shohei (1588) | Won 2-1 | +191545 |
| 6standard | 349 | Hayashi, Nobuhiko (1485) | Won 2-0 | +171562 |
| 7standard | 216 | Yamauchi, Youta (1459) | Won 2-1 | +161578 |
| 8standard | 137 | Tanaka, Ryouma (1584) | Lost 0-2 | -171561 |
| 9standard | 257 | Yoshizawa, Kaoru (1444) | Won 2-0 | +151576 |
| top | average opponent: 1562record: 6-2-1 | new rating: 1576 | ||