Chiku, Kotaro
Current rating: 1709 (#5955)
Record: 15-6
| Regional Championships Aichi 2023 (pioneer) | starting rating: 1529 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 84 | Akaike, Yo (1738) | Won 2-1 | +211550 |
| 2pioneer | 19 | Tase, Yuya (1603) | Won 2-1 | +191569 |
| 3pioneer | 4 | Nishihara, Koya (1542) | Lost 1-2 | -181551 |
| 4pioneer | 35 | sano, tsukasa (1521) | Won 2-0 | +171568 |
| 5pioneer | 28 | INOUE, RYUJI (1541) | Won 2-1 | +181586 |
| 6pioneer | 19 | Ito, Keita (1566) | Won 2-1 | +171603 |
| 7pioneer | 8 | Naitou, Keisuke (1841) | Won 2-0 | +231626 |
| 8pioneer | 3 | Hosokawa, Yuya (1978) | Won 2-0 | +241650 |
| 9pioneer | 1 | Nakao, Motohiko (1958) | Lost 0-2 | -131637 |
| 10pioneer | 9 | Matsuda, Issei (1658) | Won 2-0 | +191656 |
| 11pioneer | 4 | Yasooka, Shota (2078) | Won 2-1 | +251681 |
| 12pioneer | 4 | Sato, Rei (1992) | Won 2-1 | +231704 |
| Qpioneer | Yokokawa, Yuta (1568) | Won 2-1 | +161720 | |
| Spioneer | Masukado, Kenta (2136) | Lost 1-2 | -111709 | |
| average opponent: 1766record: 11-3 | new rating: 1709 | |||
| Regional Championships Chiba 2023 (pioneer) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 28 | Honda, Rintaro (1805) | Won 2-1 | +231523 |
| 2pioneer | 20 | Lim, Junghun (1548) | Won 2-0 | +191542 |
| 3pioneer | 24 | Iwaki, Ryota (1647) | Lost 1-2 | -161526 |
| 4pioneer | 27 | JANG, HYUNDEOK (1569) | Lost 1-2 | -171509 |
| 5pioneer | 39 | Tanaka, Shun (1423) | Won 2-1 | +161525 |
| 6pioneer | 23 | Lee, Shi Tian (1717) | Lost 0-2 | -151510 |
| 7pioneer | 52 | Yamagata, Hiroki (1521) | Won 2-0 | +191529 |
| average opponent: 1604record: 4-3 | new rating: 1529 | |||