Oosaki, Masakazu
Current rating: 1491
Record: 85-101-7
- 2001
- 2002
- 2003
- 2010
- 2011
- 2012
- 2013
- 2014
- 2015
- 2016
- 2017
- 2019
- 2020
| Grand Prix Nagoya 2020 (pioneer) | starting rating: 1542 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 391 | Ichise, Akihiro (1500) | Lost 1-2 | -191523 |
| 2pioneer | 392 | Kamiyama, Daiki (1436) | Won 2-0 | +161539 |
| 3pioneer | 521 | Okano, Yukimasa (1566) | Lost 0-2 | -171522 |
| 4pioneer | 666 | Suzuki, Yuta (1394) | Lost 1-2 | -211501 |
| 5pioneer | 713 | Kawada, Hiroyuki (1285) | Won 2-0 | +151516 |
| 6pioneer | 597 | Ohtsuki, Shinya (1320) | Won 2-0 | +141530 |
| 7pioneer | 398 | Matsumoto, Ryohei (1447) | Lost 0-2 | -191511 |
| 8pioneer | 398 | Sezume, Akihiro (1447) | Lost 0-2 | -201491 |
| top | average opponent: 1424record: 3-5 | new rating: 1491 | ||
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1429 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 566 | Ushie, Yuuta (1842) | Won 2-1 | +251454 |
| 2sealed | 188 | Kimura, Yu7770 (1560) | Won 2-0 | +201474 |
| 3sealed | 240 | Suzuki, Ryouta (1513) | Won 2-1 | +191493 |
| 4sealed | 173 | Shibata, Toru (1700) | Won 2-1 | +221515 |
| 5sealed | 103 | Nose, Shun (1574) | Won 2-0 | +191534 |
| 6sealed | 41 | Bae, Daekyeung (1705) | Won 2-1 | +211555 |
| 7sealed | 14 | Endo, Takuya7968 (1446) | Lost 0-2 | -201535 |
| 8sealed | 41 | Saito, Tomoharu (1926) | Lost 0-2 | -111524 |
| 9sealed | 125 | Matsuyama, Satoshi (1660) | Lost 0-2 | -161508 |
| 10draft | 51 | Tanaka, Syunya (1605) | Lost 1-2 | -161492 |
| 11draft | 95 | Oohashi, Toshiyuki (1757) | Won 2-0 | +231515 |
| 12draft | 98 | Nishimura, Takashi5362 (1712) | Won 2-1 | +211536 |
| 13draft | 192 | Asada, Naoya (1549) | Lost 0-2 | -181518 |
| 14draft | 114 | Henmi, Ryuji (1650) | Won 2-0 | +211539 |
| 15draft | 131 | Naitou, Keisuke (1702) | Draw 1-1 | +31542 |
| top | average opponent: 1660record: 9-5-1 | new rating: 1542 | ||
| Grand Prix Kyoto 2019 (RNA standard) | starting rating: 1450 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 331 | Kawada, Hiroyuki (1264) | Lost 1-2 | -221428 |
| 2standard | 732 | Nakagami, Takanori (1350) | Lost 1-2 | -191409 |
| 3standard | 914 | Urabe, Hirofumi (1323) | Won 2-1 | +161425 |
| 4standard | 792 | Katayama, Satoru (1424) | Won 2-1 | +181443 |
| 5standard | 620 | Shono, Takanari (1454) | Lost 1-2 | -171426 |
| 6standard | 692 | Kikuchi, Takeshi (1562) | Won 2-0 | +201446 |
| 7standard | 497 | Nakai, Yoshiharu (1506) | Lost 1-2 | -171429 |
| top | average opponent: 1412record: 3-4 | new rating: 1429 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1530 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 303 | Hiyama, Syunsuke (1524) | Lost 0-2 | -181512 |
| 2sealed | 603 | He, Kan (1489) | Won 2-0 | +181530 |
| 3sealed | 911 | Hayashi, Nobuhiko (1453) | Draw 1-1 | -11529 |
| 4sealed | 806 | Matsuzaki, Eiji (1455) | Lost 1-2 | -201509 |
| 5sealed | 936 | Matsushima, Naoki (1209) | Lost 1-2 | -231486 |
| 6sealed | 966 | Kikuchi, Masanobu (1464) | Won 2-0 | +171503 |
| 7sealed | 834 | Nakabayashi, Ryouta (1470) | Lost 0-2 | -181485 |
| 8sealed | 781 | Noguchi, Masayoshi (1500) | Lost 1-2 | -181467 |
| 9sealed | 690 | Homma, Akira (1498) | Lost 0-2 | -171450 |
| top | average opponent: 1451record: 2-6-1 | new rating: 1450 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1575 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 655 | Kurano, Eisuke (1517) | Won 2-1 | +171592 |
| 3standard | 486 | Sawasato, Yuuki (1520) | Lost 1-2 | -191573 |
| 4standard | 690 | Hayashi, Katsuji (1450) | Lost 1-2 | -201553 |
| 5standard | 776 | Kouzu, Yuu (1502) | Won 2-1 | +171570 |
| 6standard | 682 | Saito, Toru (1621) | Lost 0-2 | -171553 |
| 7standard | 931 | Arai, Ikki (1362) | Won 2-1 | +141567 |
| 8standard | 704 | Yanase, Kaname (1695) | Lost 1-2 | -151552 |
| 9standard | 776 | Tan, Darren (1381) | Lost 0-2 | -221530 |
| top | average opponent: 1506record: 3-5 | new rating: 1530 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1571 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 552 | Oshikawa, Akira (1639) | Won 2-1 | +201591 |
| 3sealed | 29 | Hayashi, Shinsuke (1921) | Won 2-0 | +231614 |
| 4sealed | 99 | Nakano, Tatsuhito (1559) | Lost 1-2 | -191595 |
| 5sealed | 279 | Ishino, Katsunori (1461) | Won 2-1 | +161611 |
| 6sealed | 313 | Takagi, Yuma (1542) | Lost 0-2 | -191592 |
| 7sealed | 287 | Fuzita, Syunsuke (1537) | Won 2-0 | +171609 |
| 8sealed | 206 | Itou, Shougo (1758) | Lost 0-2 | -161593 |
| 9sealed | 419 | Yamaguchi, Hiroshi2043 (1588) | Lost 0-2 | -181575 |
| top | average opponent: 1626record: 4-4 | new rating: 1575 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1579 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 1011 | Tsutsumi, Naoki (1455) | Lost 0-2 | -201559 |
| 3sealed | 1127 | Sumi, Yoshiaki (1446) | Won 2-0 | +151574 |
| 4sealed | 1001 | Wagatsuma, Atsushi (1515) | Won 2-0 | +171591 |
| 5sealed | 908 | Sekikawa, Tsubasa (1501) | Lost 0-2 | -191572 |
| 6sealed | 1080 | Shimizu, Yusuke (1489) | Won 2-1 | +161588 |
| 7sealed | 953 | Abe, Hiroyuki (1594) | Lost 0-2 | -181570 |
| 8sealed | 984 | Okamoto, Jin (1739) | Lost 0-2 | -151555 |
| 9sealed | 945 | Shiraishi, Shinji (1443) | Won 2-0 | +161571 |
| top | average opponent: 1523record: 4-4 | new rating: 1571 | ||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1545 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 95 | Morimoto, Shinichi (1536) | Won 2-0 | +181563 |
| 3sealed | 93 | Satonaka, Kentarou (1446) | Won 2-0 | +161579 |
| 4sealed | 39 | Kodama, Ren (1518) | Lost 1-2 | -191560 |
| 5sealed | 206 | Kajiwara, Shou (1537) | Lost 0-2 | -191541 |
| 6sealed | 209 | Sakai, Souichirou (1529) | Won 2-0 | +181559 |
| 7sealed | 149 | Morita, Kouki (1609) | Won 2-1 | +191578 |
| 8sealed | 89 | Nakaoka, Koshiro (1559) | Lost 0-2 | -181560 |
| 9sealed | 103 | Takami, Yuta (1619) | Won 2-1 | +191579 |
| top | average opponent: 1544record: 5-3 | new rating: 1579 | ||
| Grand Prix Kobe 2014 (modern) | starting rating: 1550 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 230 | Umeyama, Naoki (1429) | Won 2-0 | +161566 |
| 2modern | 287 | Khoo, Shawn (1666) | Lost 0-2 | -171549 |
| 3modern | 337 | Watanabe, Yusuke2795 (1501) | Lost 0-1 | -181531 |
| 4modern | 481 | Matsumata, Syusaku (1464) | Won 2-0 | +161547 |
| 5modern | 260 | Ito, Hajime (1516) | Won 2-1 | +181565 |
| 6modern | 225 | Ooi, Masaki (1526) | Lost 0-2 | -191546 |
| 7modern | 343 | Takada, Hiroki (1497) | Draw 1-1 | -11545 |
| top | average opponent: 1514record: 3-3-1 | new rating: 1545 | ||
| Grand Prix Nagoya 2014 (BNG limited) | starting rating: 1559 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 703 | Tsuchida, Yuuki (1409) | Won 2-0 | +151574 |
| 3sealed | 647 | Shirakawa, Yuichiro (1549) | Lost 1-2 | -181556 |
| 4sealed | 613 | Okamura, Kazuya (1435) | Lost 1-2 | -201536 |
| 5sealed | 713 | Koike, Takumi (1505) | Won 2-0 | +171553 |
| 6sealed | 687 | Ishii, Taiyo (1432) | Won 2-0 | +161569 |
| 7sealed | 668 | Nakaoka, Koshiro (1570) | Lost 0-2 | -181551 |
| 8sealed | 637 | Hashidume, Shintaro (1522) | Won 2-0 | +171568 |
| 9sealed | 625 | Arahori, Kazuaki (1539) | Lost 1-2 | -181550 |
| top | average opponent: 1495record: 4-4 | new rating: 1550 | ||
| Grand Prix Shizuoka 2013 (THS standard) | starting rating: 1456 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 679 | Ebitani, Keisuke (1635) | Won 2-0 | +211477 |
| 3standard | 617 | Itou, Masahiro1014 (1431) | Won 2-1 | +171494 |
| 4standard | 526 | Fujimoto, Yuusuke (1555) | Won 2-0 | +191513 |
| 5standard | 524 | Okada, Kou (1617) | Won 2-0 | +201533 |
| 6standard | 501 | Mizutani, Yosuke (1785) | Won 2-1 | +231556 |
| 7standard | 505 | Hirayama, Atsushi (1744) | Won 2-0 | +211577 |
| 8standard | 506 | Ishiguro, Satoshi0631 (1566) | Lost 1-2 | -181559 |
| 9standard | 623 | Kumagai, Riku (1738) | Won 2-1 | +211580 |
| 10standard | 21 | Kuo, Tzu-Ching (1876) | Won 2-0 | +231603 |
| 11standard | 5 | Cho, Bu-Hong (1717) | Lost 0-2 | -161587 |
| 12standard | 26 | Nagashima, Makoto (1749) | Lost 1-2 | -151572 |
| 13standard | 59 | Yonezawa, Musashi (1701) | Lost 0-2 | -151557 |
| 14standard | 73 | Ambrose, Keith (1573) | Lost 1-2 | -181539 |
| 15standard | 72 | Nitta, Yuki (1655) | Won 2-1 | +201559 |
| top | average opponent: 1667record: 9-5 | new rating: 1559 | ||
| Grand Prix Kitakyushu 2013 (M14 standard) | starting rating: 1441 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 38 | Nakamura, Takatoshi (1704) | Won 2-1 | +231464 |
| 3standard | 153 | Suzuki, Kenta (1562) | Lost 1-2 | -161448 |
| 4standard | 216 | Kondou, Yoshiki (1579) | Won 2-0 | +201468 |
| 5standard | 202 | Isogami, Kazuma (1540) | Lost 1-2 | -171451 |
| 6standard | 332 | Ohmoto, Masaya (1413) | Lost 1-2 | -181433 |
| 7standard | 288 | Hosokawa, Yuya (1678) | Won 2-1 | +221455 |
| 8standard | 232 | Na-chiangmai, Pongpipat (1493) | Draw 1-1 | +11456 |
| top | average opponent: 1567record: 3-3-1 | new rating: 1456 | ||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1355 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 768 | Maruyama, Tomohiro (1646) | Won 2-0 | +231378 |
| 3sealed | 684 | Sawahata, Atsushi (1543) | Draw 1-1 | +31381 |
| 4sealed | 781 | Imai, Masakatsu (1469) | Won 2-1 | +201401 |
| 5sealed | 716 | Ohori, Akihito (1436) | Won 2-0 | +181419 |
| 6sealed | 680 | Kanazawa, Kyougo (1561) | Won 2-1 | +211440 |
| 7sealed | 664 | Nakamura, Atsushi (1771) | Won 2-0 | +241464 |
| 8sealed | 833 | Ushie, Yuuta (1816) | Lost 0-2 | -121452 |
| 9sealed | 855 | Yamaguchi, Satoshi (1864) | Lost 0-2 | -111441 |
| top | average opponent: 1638record: 5-2-1 | new rating: 1441 | ||
| Grand Prix Nagoya 2012 (RTR standard) | starting rating: 1230 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 249 | Yamazaki, Hiroyuki (1538) | Lost 1-2 | -121218 |
| 3standard | 410 | Terakura, Syouta (1500) | Won 2-0 | +231241 |
| 4standard | 418 | Shimizu, Yousuke (1633) | Won 2-0 | +241265 |
| 5standard | 164 | Mituyasu, Yuki (1508) | Won 2-1 | +231288 |
| 6standard | 197 | Nagai, Yuuki (1481) | Won 2-0 | +211309 |
| 7standard | 104 | Kim, Chang-Hoi (1473) | Lost 0-2 | -151294 |
| 8standard | 113 | Takeshita, Kouhei (1551) | Won 2-1 | +231317 |
| 9standard | 77 | Abe, Michio (1557) | Won 2-1 | +221339 |
| 10standard | 59 | Endo, Ryota (1842) | Lost 1-2 | -91330 |
| 11standard | 99 | Babasaki, Taro (1562) | Lost 1-2 | -141316 |
| 12standard | 98 | Toriuchi, Daizo (1501) | Lost 1-2 | -151301 |
| 13standard | 95 | Tada, Mitsuhiro (1543) | Won 0-0 | +221323 |
| 14standard | 88 | Yamamura, Yuuko (1522) | Lost 0-2 | -141309 |
| 15standard | 87 | Maruyama, Nobuhiro (1523) | Won 2-0 | +221331 |
| 16standard | 79 | Hiramatsu, Mamoru (1683) | Won 2-1 | +241355 |
| top | average opponent: 1561record: 9-6 | new rating: 1355 | ||
| Grand Prix Yokohama 2012 (modern) | starting rating: 1235 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 221 | Yamaoka, Nobuyuki (1500) | Won 2-1 | +221257 |
| 3modern | 102 | Misumi, Kyouhei (1537) | Won 2-0 | +231280 |
| 4modern | 145 | Furukawa, Hiroki (1608) | Lost 0-2 | -121268 |
| 5modern | 234 | Kawakami, Hiroshi (1744) | Lost 1-2 | -101258 |
| 6modern | 259 | Hoshino, Yohei (1504) | Lost 0-2 | -131245 |
| 7modern | 370 | Choi, Young-Il (1449) | Lost 0-2 | -151230 |
| top | average opponent: 1557record: 2-4 | new rating: 1230 | ||
| Grand Prix Kobe 2012 (DKA limited) | starting rating: 1306 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 205 | Miyazaki, Kodai (1525) | Lost 0-2 | -141292 |
| 3sealed | 265 | Shimonaka, Ryo (1500) | Lost 1-2 | -141278 |
| 4sealed | 457 | Kawaguchi, Takahiro (1456) | Lost 1-2 | -151263 |
| 5sealed | 429 | Atomi, Yuki (1460) | Lost 0-2 | -141249 |
| 6sealed | 392 | Moriyasu, Genki (1468) | Lost 0-2 | -141235 |
| top | average opponent: 1482record: 0-5 | new rating: 1235 | ||
| Grand Prix Hiroshima 2011 (ISD standard) | starting rating: 1314 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 275 | Imura, Satoshi (1674) | Lost 1-2 | -111303 |
| 2standard | 264 | Hideaki K., (1482) | Lost 1-2 | -151288 |
| 3standard | 310 | Tsuboyama, Shuta (1483) | Lost 0-2 | -151273 |
| 4standard | 380 | Yasuda, Takuma (1445) | Won 2-0 | +221295 |
| 5standard | 320 | Iwasaki, Shinnosuke (1462) | Won 2-0 | +211316 |
| 6standard | 259 | Tsubokura, Hirotada (1481) | Won 2-1 | +211337 |
| 7standard | 204 | Asai, Ryutaro (1499) | Lost 1-2 | -161321 |
| 8standard | 185 | Imai, Ayato (1475) | Lost 1-2 | -151306 |
| top | average opponent: 1500record: 3-5 | new rating: 1306 | ||
| Grand Prix Kobe 2011 (extended) | starting rating: 1316 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 158 | M., Hiroshi (1500) | Won 2-1 | +211337 |
| 2extended | 57 | Wada, Takahide (1518) | Lost 1-2 | -151322 |
| 3extended | 229 | Shiba, Joutarou (1499) | Won 2-1 | +211343 |
| 4extended | 104 | Ikeda, Kazuki (1560) | Lost 1-2 | -141329 |
| 5extended | 194 | Honda, Takeshi (1503) | Lost 0-2 | -151314 |
| top | average opponent: 1516record: 2-3 | new rating: 1314 | ||
| Grand Prix Yokohama 2010 (extended) | starting rating: 1326 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 412 | Ooba, Yukio (1500) | Lost 1-2 | -151311 |
| 2extended | 427 | Hirose, Yuuki (1527) | Won 2-1 | +221333 |
| 3extended | 222 | Kawai, Hiroki (1504) | Won 2-1 | +211354 |
| 4extended | 217 | Kawano, Yuuya (1515) | Lost 0-2 | -151339 |
| 5extended | 317 | Shimoda, Tatsuro (1500) | Draw 1-1 | +31342 |
| 6extended | 302 | Ichinose, Kenji (1499) | Lost 0-2 | -151327 |
| 7extended | 261 | Tanbo, Yoshiki (1432) | Lost 0-2 | -171310 |
| 8extended | 166 | Ishizawa, Daichi (1461) | Lost 0-2 | -151295 |
| 9extended | 158 | Shimizu, Ryo (1428) | Won 2-0 | +211316 |
| top | average opponent: 1485record: 3-5-1 | new rating: 1316 | ||
| Grand Prix Yokohama 2003 (Onslaught block) | starting rating: 1401 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 59 | Senou, Yoshiyuki (1500) | Lost 0-2 | -161385 |
| 2block | 338 | Kitano, Tetsuya (1515) | Lost 0-2 | -161369 |
| 3block | 378 | Nakanishi, Keisuke (1452) | Draw 1-1 | +21371 |
| 4block | 365 | Tanahashi, Masayasu (1464) | Lost 0-2 | -171354 |
| 5block | 361 | Nagata, Hikaru (1446) | Lost 0-1 | -161338 |
| 6block | 338 | Adachi, Hikaru (1448) | Won 2-0 | +201358 |
| 7block | 288 | Shimamura, Masatoshi (1450) | Lost 1-2 | -161342 |
| 8block | 257 | Yamaguchi, Yasutaka (1450) | Lost 1-2 | -161326 |
| top | average opponent: 1466record: 1-6-1 | new rating: 1326 | ||
| Grand Prix Kyoto 2003 (LGN limited) | starting rating: 1429 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 243 | Sugimoto, Hiroki (1483) | Lost 0-2 | -171412 |
| 2sealed | 293 | Okuchi, Tasuku (1484) | Won 2-0 | +191431 |
| 3sealed | 210 | Ito, Kenji (1504) | Lost 0-2 | -171414 |
| 4sealed | 214 | Matsuda, Yasuhiro (1481) | Lost 1-2 | -171397 |
| 5sealed | 226 | Sugimoto, Satoshi (1508) | Won 2-0 | +201417 |
| 6sealed | 176 | Aoki, Masanori (1454) | Won 2-0 | +191436 |
| 7sealed | 129 | Hasegawa, Taro (1561) | Lost 0-2 | -161420 |
| 8sealed | 84 | Tani, Tokuo (1345) | Lost 1-2 | -191401 |
| top | average opponent: 1477record: 3-5 | new rating: 1401 | ||
| Grand Prix Sapporo 2002 (Odyssey block) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 124 | Baba, Yasuo (1500) | Won 2-0 | +191500 |
| 2block | 86 | Sato, Hidetaka (1518) | Lost 0-2 | -181482 |
| 3block | 158 | Sakuma, Toshimitsu (1449) | Lost 0-2 | -191463 |
| 4block | 155 | Yamazaki, Hiroyuki (1513) | Lost 0-2 | -171446 |
| 5block | 182 | Yasukawa, Kazuhide (1467) | Won 2-0 | +191465 |
| 6block | 142 | Sato, Takeshi (1450) | Lost 1-2 | -191446 |
| 7block | 138 | Ozawa, Yasunobu (1463) | Lost 0-2 | -171429 |
| top | average opponent: 1480record: 2-5 | new rating: 1429 | ||
| Grand Prix Kobe 2001 (Invasion block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 218 | Hiraoka, Toshiaki (1486) | Lost 1-2 | -181482 |
| 2block | 429 | Fukuda, Shintaro (1482) | Won 2-1 | +181500 |
| 3block | 373 | Ishikawa, Atsushi (1500) | Won 2-0 | +181518 |
| 4block | 320 | Iwamoto, Shota (1517) | Lost 0-2 | -181500 |
| 5block | 325 | Kou, Nobuaki (1499) | Won 2-0 | +181518 |
| 6block | 456 | Moriyama, Dai (1489) | Lost 1-2 | -191499 |
| 7block | 324 | Miura, Takanori (1501) | Lost 1-2 | -181481 |
| top | average opponent: 1496record: 3-4 | new rating: 1481 | ||