Seki, Yoshio
Current rating: 1507
Record: 18-17-4
| Grand Prix Utsunomiya 2002 (ONS rochester) | starting rating: 1547 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 204 | Aoki, Tomokazu (1500) | Won 2-0 | +171564 |
| 2sealed | 99 | Otsuka, Kotaro (1563) | Lost 0-2 | -181546 |
| 3sealed | 152 | Nagai, Go (1463) | Lost 1-2 | -191527 |
| 4sealed | 219 | Shibuya, Tsutomu (1441) | Lost 0-2 | -201507 |
| top | average opponent: 1492record: 1-3 | new rating: 1507 | ||
| Grand Prix Sendai 2001 (extended) | starting rating: 1551 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 11 | Suzuki, Takayuki (1500) | Lost 1-2 | -191532 |
| 2extended | 118 | Ukida, Takashi (1482) | Won 2-0 | +171549 |
| 3extended | 108 | Yamada, Akira (1485) | Draw 1-1 | -11548 |
| 4extended | 148 | Sato, Yoshihiro (1500) | Draw 0-0 | -11547 |
| top | average opponent: 1492record: 1-1-2 | new rating: 1547 | ||
| Grand Prix Shizuoka 2001 (ODY limited) | starting rating: 1528 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 5 | Adachi, Shingo (1547) | Lost 1-2 | -181510 |
| 3sealed | 180 | Suzuki, Michihiro (1498) | Won 2-1 | +181528 |
| 4sealed | 161 | Nomura, Eiji (1605) | Won 2-1 | +191547 |
| 5sealed | 121 | Kagami, Gen (1590) | Won 2-0 | +191566 |
| 6sealed | 73 | Morita, Masahiko (1603) | Lost 0-2 | -171549 |
| 7sealed | 69 | Hina, Kazuhiro (1520) | Won 2-1 | +171566 |
| 8sealed | 39 | Higaki, Takao (1741) | Lost 0-2 | -151551 |
| top | average opponent: 1586record: 4-3 | new rating: 1551 | ||
| Grand Prix Kobe 2001 (Invasion block) | starting rating: 1568 | |||
| round | table | opponent (rating) | result | Δrating |
| 2block | 179 | Kinoshita, Junichi (1500) | Lost 1-2 | -191549 |
| 3block | 276 | Yagi, Akira (1446) | Won 2-1 | +161565 |
| 4block | 249 | Kubota, Tatsuya (1518) | Lost 0-2 | -191546 |
| 5block | 385 | Nishimura, Shunichiro (1499) | Lost 0-2 | -181528 |
| top | average opponent: 1491record: 1-3 | new rating: 1528 | ||
| Grand Prix Hiroshima 2001 (INV limited) | starting rating: 1555 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 119 | Ueno, Motohiro (1500) | Won 2-0 | +171572 |
| 2sealed | 12 | Mori, Kazushi (1518) | Won 2-1 | +171589 |
| 3sealed | 15 | Nakayama, Tetsuji (1535) | Draw 1-1 | -11588 |
| 4sealed | 45 | Okamoto, Jin (1532) | Lost 1-2 | -191569 |
| 5sealed | 88 | Chang, Mark (1585) | Won 2-0 | +181587 |
| 6sealed | 55 | Yoshii, Tatsuo (1584) | Draw 1-1 | 01587 |
| 7sealed | 74 | Mikami, Kazuya (1535) | Lost 0-2 | -191568 |
| top | average opponent: 1541record: 3-2-2 | new rating: 1568 | ||
| Grand Prix Kyoto 2000 (extended) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 122 | Okada, Yu (1500) | Won 2-0 | +181499 |
| 2extended | 109 | Kawabata, Yuriko (1518) | Won 2-0 | +181517 |
| 3extended | 89 | Okabayashi, Masanao (1588) | Lost 0-2 | -161501 |
| 4extended | 175 | Kashiwagi, Tetsuya (1517) | Won 2-0 | +181519 |
| 5extended | 91 | Higuchi, Yusuke (1543) | Won 2-0 | +181537 |
| 6extended | 68 | Ogura, Ryou (1520) | Won 2-1 | +181555 |
| 7extended | 53 | Hayashi, Shinsuke (1575) | Lost 1-2 | -181537 |
| 8extended | 58 | Hojo, Naomasa (1519) | Won 2-1 | +181555 |
| top | average opponent: 1535record: 6-2 | new rating: 1555 | ||
| Grand Prix Sapporo 2000 (PCY limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 21 | Yoshino, Eiichi (1500) | Won 1-0 | +181518 |
| 3sealed | 22 | Furuta, Yuki (1500) | Won 1-0 | +181536 |
| 4sealed | 2 | Morita, Masahiko (1500) | Lost 0-1 | -191517 |
| 5sealed | 21 | Sato, Shinichi (1517) | Lost 1-2 | -181499 |
| 6sealed | 62 | Nonishi, Keiichiro (1483) | Lost 1-2 | -181481 |
| top | average opponent: 1500record: 2-3 | new rating: 1481 | ||