Biwaki, Toshiaki
Current rating: 1649
Record: 43-30-3
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1645 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 156 | Morikawa, Taichi (1629) | Won 2-1 | +181663 |
| 2sealed | 233 | Kubota, Muneaki (1536) | Lost 0-2 | -211642 |
| 3sealed | 464 | Takeda, Shunsuke (1474) | Won 2-0 | +151657 |
| 4sealed | 310 | Otsuka, Tomohito (1542) | Won 2-1 | +161673 |
| 5sealed | 234 | Mishima, Noriaki (1502) | Won 2-1 | +151688 |
| 6sealed | 88 | Kimura, Keisuke (1610) | Lost 1-2 | -191669 |
| 7sealed | 222 | Kozai, Tomonori (1557) | Lost 0-2 | -201649 |
| top | average opponent: 1550record: 4-3 | new rating: 1649 | ||
| Grand Prix Kobe 2014 (modern) | starting rating: 1639 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 128 | Kondo, Toshihiko (1500) | Lost 0-2 | -201619 |
| 2modern | 437 | Fujiwara, Takashi (1525) | Won 2-0 | +161635 |
| 3modern | 390 | Oldekamp, Ulf (1563) | Won 2-0 | +171652 |
| 4modern | 307 | Suzuki, Tatsurou (1501) | Lost 0-2 | -211631 |
| 5modern | 371 | Saito, Tomoya (1625) | Won 2-1 | +181649 |
| 6modern | 270 | Hibino, Yasutaka (1609) | Lost 1-2 | -191630 |
| 7modern | 328 | Tamaki, Yuuta (1453) | Won 2-1 | +151645 |
| top | average opponent: 1539record: 4-3 | new rating: 1645 | ||
| Grand Prix Kitakyushu 2013 (M14 standard) | starting rating: 1619 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 94 | Kawahara, Masanobu (1433) | Lost 0-2 | -211598 |
| 4standard | 329 | Nagamoto, Kouji (1531) | Won 2-1 | +161614 |
| 5standard | 99 | Hangyo, Tatsuya (1538) | Won 2-0 | +171631 |
| 6standard | 115 | Okayama, Hironori (1447) | Won 2-0 | +151646 |
| 7standard | 53 | Tsujikawa, Taiga (1650) | Lost 0-2 | -181628 |
| 8standard | 163 | Murakami, Kazuya3837 (1595) | Won 2-0 | +171645 |
| 9standard | 104 | Pinyo, Wathanyu (1588) | Won 2-1 | +171662 |
| 10standard | 77 | Muraoka, Daiki (1650) | Won 2-1 | +181680 |
| 11standard | 42 | Abe, Yuji (1532) | Lost 1-2 | -211659 |
| 12standard | 65 | Kageyama, Hiroki (1548) | Won 2-1 | +161675 |
| 13standard | 24 | Kou, Changsu (1752) | Lost 0-2 | -161659 |
| 14standard | 45 | Shiode, Satoshi (1588) | Lost 1-2 | -201639 |
| top | average opponent: 1571record: 7-5 | new rating: 1639 | ||
| Grand Prix Hiroshima 2011 (ISD standard) | starting rating: 1613 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 19 | Oldziey, Kalim (1500) | Won 2-0 | +161629 |
| 2standard | 126 | Shinzawa, Masahito (1426) | Won 2-1 | +141643 |
| 3standard | 20 | Tai, Akio (1536) | Lost 1-2 | -201623 |
| 4standard | 155 | Deguchi, Koya (1470) | Won 2-1 | +151638 |
| 5standard | 141 | Saegusa, Nobuyuki (1558) | Lost 0-2 | -191619 |
| top | average opponent: 1498record: 3-2 | new rating: 1619 | ||
| Grand Prix Hiroshima 2003 (extended) | starting rating: 1610 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 107 | Okada, Wataru (1492) | Won 2-0 | +161626 |
| 2extended | 26 | Hashima, Takumi (1518) | Won 2-0 | +161642 |
| 3extended | 33 | Yanagawa, Masaru (1534) | Won 2-1 | +161658 |
| 4extended | 29 | Shikatake, Naoki (1607) | Lost 1-2 | -191639 |
| 5extended | 49 | Nakauchi, Mayumi (1539) | Lost 1-2 | -191620 |
| 6extended | 103 | Nakatani, Hiroshi (1519) | Won 2-0 | +161636 |
| 7extended | 78 | Suzuki, Akihisa (1477) | Draw 1-1 | -31633 |
| 8extended | 57 | Suita, Kazunari (1516) | Lost 0-2 | -201613 |
| top | average opponent: 1525record: 4-3-1 | new rating: 1613 | ||
| Grand Prix Sendai 2001 (extended) | starting rating: 1553 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 49 | Tanaka, Jun'ichi (1470) | Won 2-0 | +171570 |
| 2extended | 64 | Shimizu, Akihiro (1518) | Won 2-1 | +171587 |
| 3extended | 28 | Harada, Hiroshi (1644) | Won 2-1 | +191606 |
| 4extended | 5 | Mukuno, Yuuji (1543) | Won 1-0 | +171623 |
| 5extended | 27 | Hirabayashi, Kazuya (1769) | Lost 1-2 | -161607 |
| 6extended | 24 | Izumi, Shinji (1592) | Won 2-0 | +181625 |
| 7extended | 27 | Shiozu, Ryouma (1837) | ID | 01625 |
| 8extended | 20 | Shvartsman, Alex (1821) | Lost 0-2 | -151610 |
| top | average opponent: 1649record: 5-2-1 | new rating: 1610 | ||
| Grand Prix Kobe 2001 (Invasion block) | starting rating: 1561 | |||
| round | table | opponent (rating) | result | Δrating |
| 2block | 180 | Matsuda, Yuki (1518) | Won 2-0 | +171578 |
| 3block | 80 | Iizuka, Shun (1519) | Lost 0-2 | -191559 |
| 4block | 358 | Miyoshida, Kunio (1521) | Won 2-0 | +171576 |
| 5block | 193 | Kusaka, Tadateru (1519) | Lost 0-2 | -191557 |
| 6block | 212 | Wang, Ming Chee (1507) | Won 2-1 | +171574 |
| 7block | 236 | Koyama, Masashi (1502) | Won 2-1 | +171591 |
| 8block | 85 | Someya, Yu (1522) | Lost 1-2 | -191572 |
| 9block | 170 | Nakazawa, Kazuhiro (1536) | Lost 1-2 | -191553 |
| top | average opponent: 1518record: 4-4 | new rating: 1553 | ||
| Grand Prix Hiroshima 2001 (INV limited) | starting rating: 1548 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 137 | Adachi, Shingo (1536) | Won 2-0 | +181566 |
| 2sealed | 13 | Wakabayashi, Kiyoshi (1501) | Won 2-1 | +161582 |
| 3sealed | 58 | Kaneko, Masanori (1537) | Lost 1-2 | -181564 |
| 4sealed | 57 | Itadani, Eisaku (1587) | Lost 0-2 | -181546 |
| 5sealed | 94 | Yaguchi, Kanzo (1530) | Lost 0-2 | -181528 |
| 6sealed | 120 | Sumino, Hironori (1416) | Won 2-0 | +161544 |
| 7sealed | 85 | Kunimasa, Takatoshi (1501) | Won 2-0 | +171561 |
| top | average opponent: 1516record: 4-3 | new rating: 1561 | ||
| Grand Prix Kyoto 2000 (extended) | starting rating: 1535 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 74 | Takeda, Hiroya (1500) | Won 2-0 | +181553 |
| 2extended | 142 | Yamazaki, Hiroki (1521) | Lost 1-2 | -191534 |
| 3extended | 248 | Yamada, Hiroaki (1500) | Won 2-1 | +181552 |
| 4extended | 160 | Koma, Shuji (1518) | Won 2-0 | +171569 |
| 5extended | 122 | Suzuki, Kenta (1455) | Won 2-0 | +161585 |
| 6extended | 39 | Komiya, Tadayoshi (1577) | Lost 0-2 | -181567 |
| 7extended | 83 | Tatsuhara, Satoshi (1536) | Lost 1-2 | -191548 |
| 8extended | 103 | Sumita, Masanobu (1530) | Draw 1-1 | 01548 |
| top | average opponent: 1517record: 4-3-1 | new rating: 1548 | ||
| Grand Prix Sapporo 2000 (PCY limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 83 | Abe, Haruki (1500) | Lost 0-2 | -181482 |
| 2sealed | 92 | Tsukimoto, Kazuhiko (1482) | Won 2-0 | +181500 |
| 3sealed | 90 | Shimizu, Hajime (1482) | Won 2-0 | +181518 |
| 4sealed | 53 | Wakabayashi, Kiyoshi (1518) | Won 2-0 | +181536 |
| 5sealed | 48 | Yoshino, Eiichi (1518) | Lost 0-2 | -191517 |
| 6sealed | 70 | Ito, Hiroaki (1516) | Draw 1-1 | 01517 |
| 7sealed | 62 | Takahashi, Katsuyoshi (1518) | Won 2-0 | +181535 |
| top | average opponent: 1505record: 4-2-1 | new rating: 1535 | ||