Kozai, Tomonori
Current rating: 1575
Record: 16-12
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1577 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 187 | Sotodate, Eikichi (1517) | Lost 1-2 | -191558 |
| 2sealed | 839 | Yanagawa, Tomoyuki (1494) | Lost 1-2 | -201538 |
| 3sealed | 1039 | Tokunaga, Masayuki (1427) | Won 2-1 | +161554 |
| 4sealed | 825 | Nakamura, Keisuke (1655) | Won 2-0 | +201574 |
| 5sealed | 665 | Sakaino, Yuta (1580) | Won 2-0 | +181592 |
| 6sealed | 396 | Kakinoki, Junichi (1603) | Lost 0-2 | -171575 |
| top | average opponent: 1546record: 3-3 | new rating: 1575 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1523 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 242 | Nakaso, Kouji (1621) | Won 2-1 | +201543 |
| 2sealed | 226 | Saito, Yuki (1440) | Won 2-0 | +161559 |
| 3sealed | 195 | Kawabata, Yuji (1525) | Won 2-1 | +171576 |
| 4sealed | 18 | Sibata, Kouji (1575) | Lost 0-2 | -181558 |
| 5sealed | 134 | Tanaka, Takuya (1502) | Won 2-0 | +171575 |
| 6sealed | 49 | Kamei, Kento (1554) | Lost 0-2 | -181557 |
| 7sealed | 222 | Biwaki, Toshiaki (1669) | Won 2-0 | +201577 |
| 8sealed | 152 | Nonaka, Harufumi (1550) | Won 2-0 | +171594 |
| 9sealed | 92 | Yamada, Yasushi (1623) | Lost 1-2 | -171577 |
| top | average opponent: 1562record: 6-3 | new rating: 1577 | ||
| Grand Prix Nagoya 2014 (BNG limited) | starting rating: 1497 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 524 | Matsushita, Ryuuki (1500) | Won 2-0 | +181515 |
| 2sealed | 567 | Mii, Masayuki (1667) | Won 2-0 | +211536 |
| 3sealed | 548 | Hirose, Yoshiyuki (1549) | Lost 1-2 | -181518 |
| 4sealed | 645 | Hiramatsu, Mamoru (1743) | Won 2-1 | +221540 |
| 5sealed | 570 | Fujimaki, Satoshi (1567) | Won 2-1 | +181558 |
| 6sealed | 605 | Nanjo, Masashi (1626) | Lost 0-2 | -161542 |
| 7sealed | 653 | Takahashi, Eiji (1499) | Lost 0-2 | -191523 |
| top | average opponent: 1593record: 4-3 | new rating: 1523 | ||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 169 | Ooba, Genki (1500) | Won 2-0 | +181518 |
| 2sealed | 105 | Tsukuda, Shunpei (1518) | Won 2-0 | +181536 |
| 3sealed | 176 | Shirakawa, Yuichiro (1531) | Lost 1-2 | -181518 |
| 4sealed | 312 | Abe, Yuji (1473) | Won 2-1 | +171535 |
| 5sealed | 81 | Nihongi, Yuta (1455) | Lost 1-2 | -191516 |
| 6sealed | 219 | Fukutani, Masato (1463) | Lost 1-2 | -191497 |
| top | average opponent: 1490record: 3-3 | new rating: 1497 | ||