Koizumi, Takashi
Current rating: 1585
Record: 10-5-1
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1555 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 151 | Sato, Junichi (1500) | Draw 1-1 | -11554 |
| 2sealed | 313 | Iwaki, Jun (1469) | Won 2-0 | +171571 |
| 3sealed | 262 | Kawagishi, Genki (1518) | Won 2-1 | +171588 |
| 4sealed | 130 | Kurokawa, Ryushi (1548) | Won 2-1 | +171605 |
| 5sealed | 68 | Kudou, Kazuki (1519) | Lost 0-2 | -201585 |
| 6sealed | 165 | Ooi, Masaki (1569) | Won 2-1 | +181603 |
| 7sealed | 93 | Yamamoto, Tarou (1580) | Lost 1-2 | -181585 |
| average opponent: 1529record: 4-2-1 | new rating: 1585 | |||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 63 | Kobayashi, Makoto (1500) | Lost 1-2 | -181482 |
| 2sealed | 323 | Shimizu, Toshiki (1502) | Won 2-1 | +181500 |
| 3sealed | 383 | Yoshii, Shunsuke (1502) | Won 2-0 | +181518 |
| 4sealed | 316 | Fujii, Daisuke (1616) | Won 2-1 | +201538 |
| 5sealed | 218 | Sato, Hisao (1474) | Won 2-0 | +171555 |
| 6sealed | 112 | Tateno, Tomoaki (1371) | Won 2-0 | +151570 |
| 7sealed | 56 | Ono, Shoichi (1576) | Lost 0-2 | -181552 |
| 8sealed | 214 | Yohara, Tosho (1567) | Won 2-0 | +181570 |
| 9sealed | 223 | Bandou, Junichirou (1741) | Lost 1-2 | -151555 |
| average opponent: 1539record: 6-3 | new rating: 1555 | |||