Oosawa, Jun
Current rating: 1541
Record: 27-30-2
| Grand Prix Hiroshima 2011 (ISD standard) | starting rating: 1452 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 187 | Takano, Kouhei (1500) | Lost 1-2 | -181434 |
| 2standard | 204 | Yashiki, Kouichi (1567) | Won 2-1 | +211455 |
| 3standard | 112 | Takada, Naoki (1499) | Won 2-1 | +191474 |
| 4standard | 194 | Kubo, Ryoutarou (1581) | Draw 1-1 | +21476 |
| 5standard | 191 | Yuba, Hirofumi (1504) | Won 2-1 | +181494 |
| 6standard | 128 | Fukui, Keisuke (1522) | Won 2-0 | +191513 |
| 7standard | 78 | Hirayama, Hideyuki (1632) | Won 2-0 | +201533 |
| 8standard | 45 | Yamamoto, Taichi (1541) | Won 2-1 | +181551 |
| 9standard | 28 | Hagiwara, Genta (1745) | Won 2-1 | +211572 |
| 10standard | 16 | Hirabayashi, Kazuya (1873) | Lost 0-2 | -121560 |
| 11standard | 33 | Hiyoshi, Tatsuhiko (1582) | Lost 0-2 | -181542 |
| 12standard | 43 | Yanase, Kaname (1551) | Lost 1-2 | -181524 |
| 13standard | 48 | Tasaki, Yasuhiro (1527) | Won 2-1 | +181542 |
| 14standard | 41 | Hoshino, Masaaki (1491) | Won 2-1 | +171559 |
| 15standard | 32 | Motiki A., (1560) | Lost 1-2 | -181541 |
| top | average opponent: 1578record: 9-5-1 | new rating: 1541 | ||
| Grand Prix Kobe 2011 (extended) | starting rating: 1421 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 182 | Tanahashi, Takahiro (1464) | Won 2-0 | +191440 |
| 2extended | 68 | Takahashi, Shigenori (1485) | Won 2-1 | +191459 |
| 3extended | 59 | Hioki, Takuro (1517) | Lost 0-2 | -171442 |
| 4extended | 170 | T., Tomo (1501) | Lost 1-2 | -171425 |
| 5extended | 179 | Sasaki, Tsutomu (1630) | Won 2-0 | +221447 |
| 6extended | 147 | Takahashi, Yoshiyuki (1590) | Won 2-1 | +201467 |
| 7extended | 103 | Yamaguchi, Satoshi (1590) | Lost 0-2 | -151452 |
| top | average opponent: 1539record: 4-3 | new rating: 1452 | ||
| Grand Prix Yokohama 2010 (extended) | starting rating: 1382 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 154 | Takizawa, Shunya (1500) | Won 2-0 | +211403 |
| 2extended | 264 | Yamada, Kota (1517) | Lost 0-2 | -161387 |
| 3extended | 380 | Hirokawa, Tatsuya (1609) | Won 2-1 | +221409 |
| 4extended | 288 | Ichitaka, Daichi (1520) | Won 2-0 | +201429 |
| 5extended | 206 | Bang, Hyun-Jung (1536) | Won 2-1 | +201449 |
| 6extended | 111 | Eura, Hiroki (1621) | Won 2-0 | +211470 |
| 7extended | 71 | Goto, Yusei (1644) | Lost 1-2 | -151455 |
| 8extended | 146 | Nagami, Youichi (1513) | Lost 0-2 | -171438 |
| 9extended | 125 | Amao, Hiroshi (1514) | Lost 0-2 | -171421 |
| top | average opponent: 1553record: 5-4 | new rating: 1421 | ||
| Grand Prix Niigata 2009 (M10 limited) | starting rating: 1415 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 30 | Okamoto, Yuuma (1500) | Lost 1-2 | -161399 |
| 2sealed | 245 | Tanaka, Yasushi (1482) | Lost 0-2 | -171382 |
| top | average opponent: 1491record: 0-2 | new rating: 1382 | ||
| Grand Prix Kobe 2009 (extended) | starting rating: 1447 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 74 | Iwase, Akira (1466) | Lost 1-2 | -181429 |
| 2extended | 208 | Tamura, Tomoaki (1429) | Won 2-1 | +181447 |
| 3extended | 174 | Kimura, Kazuaki (1625) | Lost 0-2 | -141433 |
| 4extended | 224 | Tagashira, Yuusuke (1483) | Lost 1-2 | -181415 |
| top | average opponent: 1501record: 1-3 | new rating: 1415 | ||
| Grand Prix Kobe 2008 (Lorwyn block) | starting rating: 1478 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 236 | Hoshino, Masaaki (1482) | Won 2-0 | +181496 |
| 2block | 113 | Oodan, Takeshi (1613) | Lost 0-2 | -161480 |
| 3block | 263 | Tashiro, Kouichi (1526) | Lost 0-2 | -171463 |
| 4block | 355 | Mukuno, Yuuji (1580) | Lost 0-2 | -161447 |
| top | average opponent: 1550record: 1-3 | new rating: 1447 | ||
| Grand Prix Shizuoka 2008 (MOR standard) | starting rating: 1440 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 281 | Uesugi, Fumiya (1467) | Won 2-0 | +181458 |
| 2standard | 101 | Mizuno, Fumihiro (1518) | Won 2-0 | +191477 |
| 3standard | 11 | Takakuwa, Akihiro (1790) | Won 2-1 | +241501 |
| 4standard | 83 | Takahashi, Yuta (1950) | Lost 1-2 | -111490 |
| 5standard | 78 | Yamaoka, Naoki (1546) | Lost 0-2 | -171473 |
| 6standard | 212 | Hitomi, Masaaki (1491) | Won 2-0 | +191492 |
| 7standard | 96 | Sato, Takatoshi (1569) | Lost 0-2 | -171475 |
| 8standard | 51 | Tsukamoto, Tatsushi (1544) | Lost 0-2 | -171458 |
| 9standard | 75 | Suzuki, Yasutomo (1533) | Won 2-1 | +201478 |
| top | average opponent: 1601record: 5-4 | new rating: 1478 | ||
| Grand Prix Kyoto 2007 (PLC standard) | starting rating: 1445 | |||
| round | table | opponent (rating) | result | Δrating |
| 4standard | 48 | Obata, Masayuki (1553) | Draw 1-1 | +21447 |
| 5standard | 53 | Yamaguchi, Hiroshi (1540) | Lost 1-2 | -161431 |
| 6standard | 115 | Nakamura, Naomichi (1539) | Lost 0-2 | -161415 |
| 7standard | 174 | Inoue, Toru (1537) | Lost 1-2 | -161399 |
| 8standard | 174 | Adachi, Ryosuke (1510) | Won 2-0 | +201419 |
| 9standard | 135 | Kaida, Hiroshi (1575) | Won 2-0 | +211440 |
| top | average opponent: 1542record: 2-3-1 | new rating: 1440 | ||
| Grand Prix Sendai 2001 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 110 | Toriumi, Takashi (1428) | Lost 1-2 | -191481 |
| 2extended | 115 | Yamagami, Isao (1480) | Lost 1-2 | -181463 |
| 3extended | 167 | Tashiro, Yoshiaki (1480) | Lost 1-2 | -181445 |
| top | average opponent: 1462record: 0-3 | new rating: 1445 | ||