Seki, Kazuhiko
Current rating: 1570
Record: 38-33-4
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1547 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 231 | Yamagishi, Yuki 8956 (1453) | Won 2-0 | +171564 |
| 2sealed | 80 | Iyanaga, Junya (1938) | Lost 0-2 | -121552 |
| 3sealed | 792 | Haraguchi, Fernando (1537) | Draw 1-1 | 01552 |
| 4sealed | 773 | Kimura, Yuki (1486) | Won 2-0 | +171569 |
| 5sealed | 528 | Hitachi, Kyle (1518) | Lost 1-2 | -191550 |
| 6sealed | 674 | Ngiam, William Wai Luen (1441) | Won 2-0 | +161566 |
| 7sealed | 495 | Arai, Yosuke (1525) | Won 2-0 | +171583 |
| 8sealed | 345 | Zhuang, Kai (1892) | Lost 1-2 | -131570 |
| top | average opponent: 1599record: 4-3-1 | new rating: 1570 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1541 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 565 | Miyazaki, Toshiyuki (1501) | Won 2-0 | +181559 |
| 2sealed | 110 | Yada, Kazuki (1903) | Lost 0-2 | -121547 |
| 3sealed | 686 | Shiba, Yoshimasa (1555) | Won 2-1 | +181565 |
| 4sealed | 637 | Taki, Masaya (1435) | Draw 1-1 | -31562 |
| 5sealed | 570 | Winter, Florian [AUT] (1580) | Won 2-1 | +191581 |
| 6sealed | 368 | Yoshida, Shintarou (1713) | Lost 0-2 | -161565 |
| 7sealed | 537 | Morishima, Ryo (1527) | Draw 1-1 | -11564 |
| 8sealed | 664 | Miyawaki, Yusuke (1607) | Lost 0-2 | -171547 |
| top | average opponent: 1603record: 3-3-2 | new rating: 1547 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1564 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 229 | Okano, Yukimasa (1538) | Won 2-0 | +171581 |
| 2modern | 192 | Hoshino, Masaaki (1664) | Lost 1-2 | -161565 |
| 3modern | 1048 | Kojima, Toshiki (1449) | Lost 0-2 | -201545 |
| 4modern | 1136 | Hara, Takashi (1483) | Won 2-0 | +171562 |
| 5modern | 938 | Nakano, Tomohiko (1481) | Won 2-0 | +161578 |
| 6modern | 733 | Suzuki, Soichiro (1515) | Won 2-1 | +171595 |
| 7modern | 268 | Gen, Takatoshi (1462) | Lost 1-2 | -201575 |
| 8modern | 755 | Urase, Ryosuke (1828) | Lost 1-2 | -141561 |
| 9modern | 614 | Horikawa, Jun (1466) | Lost 0-2 | -201541 |
| top | average opponent: 1543record: 4-5 | new rating: 1541 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1608 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 188 | Kozaki, Masahiro (1483) | Lost 0-2 | -211587 |
| 2sealed | 691 | Usio, Syoichiro (1482) | Won 2-0 | +161603 |
| 3sealed | 954 | Itou, Tadahiro (1502) | Lost 1-2 | -191584 |
| 4sealed | 1149 | Kokubo, Masayuki (1487) | Lost 0-2 | -201564 |
| top | average opponent: 1488record: 1-3 | new rating: 1564 | ||
| Grand Prix Kobe 2014 (modern) | starting rating: 1583 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 762 | Kawasaki, Shinsuke (1505) | Lost 0-2 | -201563 |
| 2modern | 1036 | Iwami, Masaki (1490) | Lost 0-2 | -191544 |
| 3modern | 1218 | Mimura, Yusuke (1464) | Won 2-1 | +171561 |
| 4modern | 1193 | Yamagami, Yudai (1535) | Won 2-1 | +171578 |
| 5modern | 1063 | Nakao, Tatsuo (1499) | Won 2-1 | +171595 |
| 6modern | 874 | Yamauchi, Takashi (1471) | Won 2-0 | +151610 |
| 7modern | 859 | Shigehisa, Tetsuya (1510) | Won 2-0 | +171627 |
| 8modern | 764 | Kim, Chan-wook (1576) | Lost 1-2 | -191608 |
| top | average opponent: 1506record: 5-3 | new rating: 1608 | ||
| Grand Prix Shizuoka 2013 (THS standard) | starting rating: 1562 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 56 | Park, Min Gyu (1535) | Lost 1-2 | -181544 |
| 4standard | 146 | Myo, Taiki (1517) | Won 2-0 | +171561 |
| 5standard | 174 | Noguchi, Takeshi (1541) | Lost 0-2 | -181543 |
| 6standard | 131 | Sakamoto, Ryousuke (1645) | Won 2-0 | +201563 |
| 7standard | 105 | Kato, Kensuke (1688) | Lost 0-2 | -161547 |
| 8standard | 150 | Fusegi, Takanori (1502) | Won 2-0 | +171564 |
| 9standard | 243 | Usami, Taro (1589) | Won 2-1 | +191583 |
| top | average opponent: 1574record: 4-3 | new rating: 1583 | ||
| Grand Prix Kyoto 2007 (PLC standard) | starting rating: 1568 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 36 | Sada, Kazutaka (1500) | Lost 0-2 | -191549 |
| 2standard | 338 | Tanaka, Yasunori (1478) | Won 2-0 | +171566 |
| 3standard | 301 | Kisaki, Tooru (1500) | Won 2-0 | +171583 |
| 4standard | 229 | Ogawa, Hiroyuki (1488) | Lost 0-2 | -201563 |
| 5standard | 270 | Nakai, Takuto (1550) | Won 2-1 | +181581 |
| 6standard | 153 | Anan, Kazuyoshi (1563) | Lost 0-2 | -191562 |
| top | average opponent: 1513record: 3-3 | new rating: 1562 | ||
| Grand Prix Shizuoka 2003 (MRD limited) | starting rating: 1534 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 51 | Yoshida, Mitsutaka (1372) | Won 2-0 | +151549 |
| 2sealed | 141 | Nakano, Fumiki (1536) | Won 2-0 | +181567 |
| 3sealed | 1 | Yasooka, Shota (1538) | Won 2-0 | +171584 |
| 4sealed | 35 | Murakami, Norichika (1608) | Lost 1-2 | -171567 |
| 5sealed | 75 | Tamai, Katsuyoshi (1501) | Won 2-0 | +161583 |
| 6sealed | 62 | Kagamihata, Atsushi (1577) | Won 2-1 | +181601 |
| 7sealed | 42 | Kinoshita, Masashi (1644) | Lost 1-2 | -171584 |
| 8sealed | 73 | Maehata, Yasuhito (1711) | Lost 1-2 | -161568 |
| top | average opponent: 1561record: 5-3 | new rating: 1568 | ||
| Grand Prix Yokohama 2003 (Onslaught block) | starting rating: 1556 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 123 | Sato, Ken (1500) | Won 2-1 | +171573 |
| 2block | 215 | Tanaka, Jun'ichi (1442) | Lost 0-2 | -201553 |
| 3block | 315 | Sonoda, Takayuki (1483) | Lost 0-2 | -191534 |
| top | average opponent: 1475record: 1-2 | new rating: 1534 | ||
| Grand Prix Utsunomiya 2002 (ONS rochester) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 58 | Kouno, Tomohiro (1500) | Won 2-1 | +181501 |
| 2sealed | 122 | Ishibashi, Masashi (1404) | Lost 1-2 | -191482 |
| 3sealed | 190 | Iguchi, Tomonori (1501) | Won 2-0 | +181500 |
| 4sealed | 122 | Yoshikawa, Hiroshi (1527) | Won 2-0 | +181518 |
| 5sealed | 43 | Yoshikawa, Yuusuke (1587) | Won 2-0 | +201538 |
| 6sealed | 68 | Saijo, Yuichi (1539) | Won 2-1 | +181556 |
| 7sealed | 37 | Bandou, Junichirou (1576) | Won 2-0 | +181574 |
| 8sealed | 21 | Shimura, Ichirou (1597) | Lost 0-2 | -181556 |
| top | average opponent: 1529record: 6-2 | new rating: 1556 | ||
| Grand Prix Shizuoka 2001 (ODY limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 161 | Nogami, Masahiro (1500) | Lost 1-2 | -181482 |
| 2sealed | 219 | Niimi, Yoshiya (1482) | Won 2-0 | +181500 |
| 3sealed | 143 | Chijimi, Keiichi (1523) | Lost 0-2 | -181482 |
| 4sealed | 271 | Iwazaki, Yuji (1483) | Won 2-0 | +181500 |
| 5sealed | 200 | Nozaki, Taiki (1534) | Draw 1-1 | +11501 |
| 6sealed | 182 | Takeshima, Katsuki (1500) | Lost 1-2 | -181483 |
| top | average opponent: 1504record: 2-3-1 | new rating: 1483 | ||