Oikawa, Masafumi
Current rating: 1446
Record: 23-31
| Grand Prix Shizuoka 2018 (standard) (GRN standard) | starting rating: 1401 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 573 | Yoshimoto, Masanobu (1645) | Lost 1-2 | -141387 |
| 2standard | 756 | Nakamura, Yuu (1437) | Lost 0-2 | -171370 |
| 3standard | 1089 | Nakao, Munenari (1679) | Won 2-1 | +241394 |
| 4standard | 901 | Kobayashi, Yuki9104 (1384) | Lost 1-2 | -181376 |
| 5standard | 973 | Nakao, Yusuke (1355) | Won 2-0 | +171393 |
| 6standard | 770 | Narumi, Masaru (1378) | Won 2-1 | +181411 |
| 7standard | 683 | Sarusawa, Yuichi (1295) | Won 2-0 | +161427 |
| 8standard | 512 | Kamada, Yuuki (1473) | Won 2-0 | +191446 |
| top | average opponent: 1456record: 5-3 | new rating: 1446 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1431 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 251 | Takato, Toshiyuki (1555) | Lost 0-2 | -161415 |
| 3standard | 802 | Mihara, Takuya (1477) | Lost 1-2 | -171398 |
| 4standard | 928 | Miyamoto, Yutaro (1561) | Lost 1-2 | -151383 |
| 5standard | 1082 | Ueki, Junichi (1391) | Won 2-0 | +181401 |
| top | average opponent: 1496record: 1-3 | new rating: 1401 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1452 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 444 | Kato, Jun (1532) | Lost 1-2 | -171435 |
| 3standard | 988 | Inukai, Yuta (1552) | Won 2-0 | +201455 |
| 4standard | 592 | Sakamoto, Masaaki (1568) | Won 2-0 | +201475 |
| 5standard | 344 | Tomomura, Hitoshi (1897) | Lost 0-2 | -101465 |
| 6standard | 883 | Takeuchi, Makoto (1522) | Lost 0-2 | -171448 |
| 7standard | 819 | Aida, Kazuki (1496) | Lost 1-2 | -171431 |
| top | average opponent: 1595record: 2-4 | new rating: 1431 | ||
| Grand Prix Kobe 2015 (BFZ standard) | starting rating: 1459 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 373 | Arita, Kazuhiro (1521) | Won 2-0 | +191478 |
| 4standard | 112 | Masumoto, Kazuhiro (1557) | Lost 1-2 | -161462 |
| 5standard | 452 | Takeda, Hiroki (1661) | Won 2-0 | +211483 |
| 6standard | 262 | Ito, Masahiro3882 (1530) | Won 2-1 | +191502 |
| 7standard | 91 | Nakagami, Takanori (1507) | Lost 1-2 | -181484 |
| 8standard | 348 | Ouchi, Akimasa (1634) | Lost 0-2 | -151469 |
| 9standard | 373 | Arai, Yuusuke3019 (1509) | Lost 1-2 | -171452 |
| top | average opponent: 1560record: 3-4 | new rating: 1452 | ||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1406 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 249 | Imura, Satoshi (1561) | Lost 1-2 | -161390 |
| 2sealed | 346 | Wada, Yousuke (1482) | Won 2-1 | +201410 |
| 3sealed | 439 | Endo, Yusuke (1499) | Lost 1-2 | -161394 |
| 4sealed | 376 | Itou, Kouei (1586) | Won 2-1 | +211415 |
| 5sealed | 267 | Yamaguchi, Yuuichi (1561) | Lost 0-2 | -151400 |
| 6sealed | 326 | Hagiya, Ginga (1486) | Won 2-0 | +191419 |
| 7sealed | 238 | Korekawa, Takashi (1467) | Won 2-1 | +191438 |
| 8sealed | 183 | Kumon, Shun (1603) | Won 2-0 | +211459 |
| top | average opponent: 1531record: 5-3 | new rating: 1459 | ||
| Grand Prix Shizuoka 2013 (THS standard) | starting rating: 1418 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 35 | Ueno, Yasunori (1486) | Won 2-1 | +191437 |
| 2standard | 54 | Kawaguchi, Takahiro (1506) | Won 2-1 | +191456 |
| 3standard | 25 | Nakamichi, Yuko (1518) | Lost 1-2 | -161440 |
| 4standard | 205 | Tamai, Toshimasa (1488) | Lost 1-2 | -181422 |
| 5standard | 249 | Nakamura, Ryouta5022 (1484) | Lost 1-2 | -161406 |
| top | average opponent: 1496record: 2-3 | new rating: 1406 | ||
| Grand Prix Nagoya 2012 (RTR standard) | starting rating: 1427 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 44 | Morita, Susumu (1541) | Lost 1-2 | -161411 |
| 3standard | 501 | Takeshita, Kouhei (1500) | Lost 1-2 | -161395 |
| 4standard | 726 | Ito, Hayato (1489) | Won 2-1 | +201415 |
| 5standard | 507 | Hamada, Junji (1481) | Won 2-0 | +191434 |
| 6standard | 407 | Suzuki, Shoya (1543) | Lost 0-2 | -161418 |
| top | average opponent: 1511record: 2-3 | new rating: 1418 | ||
| Grand Prix Yokohama 2012 (modern) | starting rating: 1422 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 376 | Yamauchi, Shotaro (1445) | Won 2-0 | +181440 |
| 2modern | 396 | Oiso, Kenji (1500) | Lost 0-2 | -171423 |
| 3modern | 430 | Takawashi, Kenji (1483) | Won 2-1 | +191442 |
| 4modern | 254 | Yamazaki, Yuuki (Kanagawa) (1504) | Lost 0-2 | -161426 |
| 5modern | 428 | Hirabayashi, Yuki (1459) | Won 2-1 | +181444 |
| 6modern | 256 | Sakaguchi, Yoichi (1515) | Lost 0-2 | -171427 |
| top | average opponent: 1484record: 3-3 | new rating: 1427 | ||
| Grand Prix Sendai 2010 (ROE standard) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 4standard | 23 | Ikeda, Tsuyoshi (1832) | Lost 0-2 | -121452 |
| 5standard | 99 | Suzuki, Hiroumi (1600) | Lost 1-2 | -151437 |
| 6standard | 149 | Sasaki, Yuusuke (1587) | Lost 1-2 | -151422 |
| top | average opponent: 1673record: 0-3 | new rating: 1422 | ||
| Grand Prix Yokohama 2010 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 36 | Miyamoto, Hiroya (1499) | Lost 1-2 | -181482 |
| 2extended | 408 | Kohki, Ogawa (1481) | Lost 1-2 | -181464 |
| top | average opponent: 1490record: 0-2 | new rating: 1464 | ||