Koizumi, Ryuta
Current rating: 1455
| Grand Prix Yokohama 2019 (modern) | starting rating: 1432 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 377 | Nakajima, Masato (1473) | Lost 1-2 | -171415 |
| 4modern | 555 | Kent, Jenista (1454) | Won 2-1 | +181433 |
| 5modern | 152 | Noto, Kohei (1485) | Won 2-1 | +191452 |
| 6modern | 270 | Nagao, Taku (1522) | Lost 0-2 | -161436 |
| 7modern | 506 | Kashiwagi, Ryohei (1772) | Won 2-0 | +241460 |
| 8modern | 204 | Ichikawa, Yuuki (1837) | Won 2-1 | +241484 |
| 9modern | 197 | Kobayasi, Tomoya (1820) | Won 2-0 | +241508 |
| 10modern | 108 | Mizoguchi, Satoru (1520) | Lost 1-2 | -181490 |
| 11modern | 117 | Anzai, Yasunobu (1489) | Lost 1-2 | -181472 |
| 12modern | 189 | Higaki, Motohide (1517) | Lost 1-2 | -171455 |
| top | average opponent: 1589record: 5-5 | new rating: 1455 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 231 | Fujioka, Kazato (1500) | Lost 1-2 | -181446 |
| 2modern | 707 | Nakai, Yoshito (1445) | Won 2-1 | +181464 |
| 3modern | 844 | Aitken, William (1658) | Lost 0-2 | -141450 |
| 4modern | 1066 | Tsuchie, Takayuki (1479) | Lost 0-2 | -181432 |
| 5modern | 1106 | Sato, Yuichi (1353) | Won 2-0 | +171449 |
| 6modern | 946 | Takano, Natsuki (1506) | Lost 1-2 | -171432 |
| top | average opponent: 1490record: 2-4 | new rating: 1432 | ||
| Grand Prix Kitakyushu 2013 (M14 standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 326 | Masakazu O., (1478) | Lost 1-2 | -181482 |
| 2standard | 301 | Shimauchi, Yoshihito (1481) | Won 2-1 | +181500 |
| 3standard | 310 | Mayaguchi, Masaru (1507) | Lost 1-2 | -181482 |
| 4standard | 517 | Goto, Takuya (1481) | Lost 1-2 | -181464 |
| top | average opponent: 1487record: 1-3 | new rating: 1464 | ||