Hosaka, Atsushi
Current rating: 1521
Record: 33-30-4
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 242 | Kaido, Yoshiaki (1380) | Won 2-0 | +161498 |
| 2sealed | 84 | Yohara, Tosho (1613) | Won 2-0 | +201518 |
| 3sealed | 310 | Kozakai, Yukio (1636) | Lost 1-2 | -161502 |
| 4sealed | 669 | Shima, Junichirou (1518) | Lost 1-2 | -181484 |
| 5sealed | 804 | Ishii, Taiyo (1521) | Won 2-1 | +191503 |
| 6sealed | 614 | Tsujii, Shoichi (1410) | Won 2-1 | +161519 |
| 7sealed | 388 | Kaneko, Hiroto (1429) | Won 2-1 | +171536 |
| 8sealed | 228 | Maki, Kazunori (1688) | Lost 0-2 | -151521 |
| top | average opponent: 1524record: 5-3 | new rating: 1521 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1503 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 139 | Suzuki, Hiroyuki (1500) | Draw 1-1 | 01503 |
| 2standard | 760 | Isaka, Yuichi (1499) | Won 2-0 | +181521 |
| 3standard | 770 | Murakami, Souta (1536) | Won 2-1 | +181539 |
| 4standard | 380 | Atsumi, Yoshihiro (1486) | Lost 1-2 | -191520 |
| 5standard | 705 | Murakami, Hiroyuki (1481) | Lost 0-2 | -181502 |
| 6standard | 1012 | Miura, Kunio (1462) | Draw 1-1 | -11501 |
| 7standard | 1127 | Chew Jun, George (1502) | Draw 1-1 | 01501 |
| 8standard | 998 | Itabashi, Ryo (1443) | Lost 1-2 | -191482 |
| top | average opponent: 1489record: 2-3-3 | new rating: 1482 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1521 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 2209 | Abe, Kazuhiro (1500) | Lost 0-2 | -181503 |
| top | record: 0-1 | new rating: 1503 | ||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1562 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 794 | Shimizu, Teruaki (1500) | Lost 0-2 | -191543 |
| 2sealed | 1003 | Kim, Jae Min (1482) | Won 2-0 | +171560 |
| 3sealed | 862 | Takeda, Yoshihide (1442) | Lost 0-2 | -211539 |
| 4sealed | 1075 | Satou, Masanori (1654) | Won 2-1 | +201559 |
| 5sealed | 929 | Kobori, Tetsuya (1545) | Lost 0-2 | -181541 |
| 6sealed | 923 | Koshiishi, Tadahito (1444) | Lost 0-2 | -201521 |
| top | average opponent: 1511record: 2-4 | new rating: 1521 | ||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1529 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 743 | Chuuganji, Yoshimi (1500) | Won 2-0 | +181547 |
| 2sealed | 817 | Minobe, Yoshihiro (1522) | Won 2-1 | +171564 |
| 3sealed | 815 | Sasaki, Yuuki (1531) | Lost 0-2 | -181546 |
| 4sealed | 954 | Ohashi, Kenta (1515) | Lost 0-2 | -191527 |
| 5sealed | 1000 | Asano, Jun'ya (1511) | Won 2-1 | +181545 |
| 6sealed | 902 | Samejima, Ippei (1512) | Won 2-0 | +171562 |
| 7sealed | 825 | Amao, Hiroshi (1580) | Won 2-1 | +181580 |
| 8sealed | 915 | Hosoda, Daiki (1543) | Lost 0-2 | -181562 |
| top | average opponent: 1527record: 5-3 | new rating: 1562 | ||
| Grand Prix Sendai 2010 (ROE standard) | starting rating: 1577 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 100 | Abe, Shigenobu (1464) | Lost 1-2 | -201557 |
| 2standard | 233 | Tamura, Youhei (1413) | Lost 0-2 | -211536 |
| 3standard | 327 | Yoshimura, Yutaka (1431) | Won 2-1 | +161552 |
| 4standard | 377 | Kajiyama, Yu (1458) | Won 2-1 | +161568 |
| 5standard | 238 | Yamamoto, Kazuhide (1483) | Lost 1-2 | -191549 |
| 6standard | 310 | Yamakawa, Hiroyuki (1460) | Lost 0-2 | -201529 |
| top | average opponent: 1452record: 2-4 | new rating: 1529 | ||
| Grand Prix Niigata 2009 (M10 limited) | starting rating: 1630 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 168 | Takahashi, Kenta (1413) | Won 2-0 | +141644 |
| 2sealed | 82 | Kikuchi, Taiki (1518) | Won 2-0 | +161660 |
| 3sealed | 93 | Sakuma, Hiroshi (1575) | Lost 1-2 | -191641 |
| 4sealed | 105 | Shoji, Kenta (1579) | Lost 1-2 | -201621 |
| 5sealed | 186 | Ueno, Takamasa (1536) | Won 2-0 | +171638 |
| 6sealed | 167 | Fukui, Keisuke (1497) | Lost 0-2 | -211617 |
| 7sealed | 165 | Shiraishi, Masaharu (1520) | Lost 1-2 | -191598 |
| 8sealed | 137 | Kawase, Yasuhiro (1437) | Lost 1-2 | -211577 |
| top | average opponent: 1509record: 3-5 | new rating: 1577 | ||
| Grand Prix Yokohama 2004 (COK limited) | starting rating: 1574 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 121 | Taru, Genki (1625) | Lost 0-2 | -171557 |
| 3sealed | 183 | Shibuya, Yuuto (1624) | Won 2-0 | +191576 |
| 4sealed | 132 | Yoshida, Takaaki (1522) | Lost 1-2 | -191557 |
| 5sealed | 166 | Komuro, Shuu (1779) | Won 2-1 | +221579 |
| 6sealed | 111 | Deyama, Hirofumi (1400) | Won 2-1 | +151594 |
| 7sealed | 94 | Maruyama, Tomohiro (1657) | Won 2-1 | +191613 |
| 8sealed | 58 | Shimizu, Motohiro (1562) | Won 2-1 | +171630 |
| top | average opponent: 1596record: 5-2 | new rating: 1630 | ||
| Grand Prix Sendai 2004 (DST limited) | starting rating: 1541 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 61 | Sugiura, Kiyohiro (1538) | Won 2-1 | +181559 |
| 2sealed | 25 | Matsuyama, Satoshi (1471) | Lost 0-2 | -201539 |
| 3sealed | 186 | Miyazaki, Hidetaka (1611) | Won 2-1 | +191558 |
| 4sealed | 112 | Yoshimoto, Kensuke (1521) | Lost 0-2 | -181540 |
| 5sealed | 171 | Amao, Hiroshi (1440) | Won 2-0 | +161556 |
| 6sealed | 102 | Fujita, Keisuke (1539) | Won 2-0 | +181574 |
| 7sealed | 78 | Lee, Sang-Ryeol (1660) | Won 2-1 | +191593 |
| 8sealed | 58 | Iizuka, Shun (1540) | Lost 1-2 | -191574 |
| top | average opponent: 1540record: 5-3 | new rating: 1574 | ||
| Grand Prix Shizuoka 2003 (MRD limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 172 | Kobatake, Atsushi (1567) | Won 2-1 | +191519 |
| 2sealed | 56 | Kikuchi, Yuuji (1544) | Won 2-1 | +191538 |
| 3sealed | 44 | Kubouchi, Naoki (1668) | Lost 0-2 | -161522 |
| 4sealed | 135 | Nagai, Takahiro (1517) | Won 2-0 | +181540 |
| 5sealed | 80 | Nakamura, Yuusuke (1553) | Draw 1-1 | 01540 |
| 6sealed | 83 | Imagawa, Hiromasa (1564) | Lost 1-2 | -171523 |
| 7sealed | 116 | Matsushita, Takashi (1524) | Won 2-1 | +181541 |
| top | average opponent: 1562record: 4-2-1 | new rating: 1541 | ||