Tahara, Ippei
Current rating: 1477
Record: 30-32-1
| Grand Prix Nagoya 2020 (pioneer) | starting rating: 1486 | |||
| round | table | opponent (rating) | result | Δrating |
| 3pioneer | 324 | Mizumoto, Hirotaka (1554) | Won 2-1 | +191505 |
| 4pioneer | 132 | Oikawa, Hakudou (1679) | Won 2-1 | +221527 |
| 5pioneer | 27 | Takagi, Takayuki (1853) | Lost 0-2 | -131514 |
| 6pioneer | 141 | Miyake, Toru (1451) | Lost 1-2 | -191495 |
| 7pioneer | 345 | Leung, Victor (1511) | Lost 1-2 | -181477 |
| top | average opponent: 1609record: 2-3 | new rating: 1477 | ||
| Grand Prix Nagoya 2019 (ELD standard) | starting rating: 1522 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 262 | Yoshioka, Shigehito (1500) | Lost 0-2 | -191503 |
| 2standard | 483 | Iwasaki, Masayuki (1549) | Lost 1-2 | -171486 |
| top | average opponent: 1524record: 0-2 | new rating: 1486 | ||
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1538 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 220 | Kamishiro, Issey (1516) | Won 2-0 | +181556 |
| 2sealed | 403 | Yap, Lyndon (1518) | Lost 0-2 | -191537 |
| 3sealed | 768 | Watanabe, Sho (1575) | Lost 1-2 | -171520 |
| 4sealed | 883 | Fukutani, Mitumasa (1405) | Won 2-0 | +161536 |
| 5sealed | 630 | Hirabayashi, Kazuya (1759) | Lost 1-2 | -141522 |
| top | average opponent: 1555record: 2-3 | new rating: 1522 | ||
| Grand Prix Yokohama 2019 (modern) | starting rating: 1513 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 689 | Shimano, Yuki (1500) | Won 2-0 | +181531 |
| 2modern | 514 | Terashima, Shota (1522) | Won 2-0 | +181549 |
| 3modern | 132 | Gondo, Kosuke (1695) | Won 2-0 | +201569 |
| 4modern | 106 | Takano, Masahiro (1692) | Won 2-1 | +211590 |
| 5modern | 93 | Oiso, Kenji (1828) | Lost 0-2 | -141576 |
| 6modern | 196 | Urabe, Ryosuke (1553) | Lost 1-2 | -191557 |
| 7modern | 515 | Ueda, Yugo (1494) | Lost 1-2 | -191538 |
| top | average opponent: 1612record: 4-3 | new rating: 1538 | ||
| Grand Prix Kyoto 2019 (RNA standard) | starting rating: 1521 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 437 | Fujita, Shinpei (1466) | Draw 1-1 | -11520 |
| 2standard | 508 | Ohno, Yusuke (1499) | Lost 0-2 | -191501 |
| 3standard | 871 | Seino, Kouhei (1481) | Won 2-0 | +181519 |
| 4standard | 684 | Sonoda, Kenichi (1321) | Won 2-1 | +141533 |
| 5standard | 477 | Mihara, Takuya (1403) | Lost 0-2 | -201513 |
| top | average opponent: 1434record: 2-2-1 | new rating: 1513 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1544 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 644 | Takakuwa, Akihiro (1612) | Lost 0-2 | -171527 |
| 2sealed | 674 | Sayama, Tomonori (1348) | Lost 0-2 | -211506 |
| 3sealed | 1156 | Zafran, Chai (1464) | Won 2-1 | +171523 |
| 4sealed | 872 | Ehara, Kazuya (1479) | Won 2-0 | +181541 |
| 5sealed | 544 | Kojima, Yoshifumi (1443) | Lost 0-2 | -201521 |
| top | average opponent: 1469record: 2-3 | new rating: 1521 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1537 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 132 | Sugimoto, Takashi (1553) | Lost 1-2 | -181519 |
| 2standard | 761 | Shibata, Yuuya (1528) | Won 2-1 | +181537 |
| 3standard | 923 | Mikami, Akihiro (1457) | Won 2-0 | +171554 |
| 4standard | 626 | Musashi, Yutaka (1521) | Lost 0-2 | -191535 |
| 5standard | 894 | Baba, Fumitaka (1496) | Won 2-0 | +181553 |
| 6standard | 471 | Ueno, Hideto (1326) | Won 2-1 | +141567 |
| 7standard | 362 | Kobayashi, Yuuki 0719 (1471) | Won 2-0 | +161583 |
| 8standard | 212 | Kanehira, Haruki (1477) | Lost 0-2 | -201563 |
| 9standard | 519 | Imazawa, Junpei (1522) | Lost 0-2 | -191544 |
| top | average opponent: 1483record: 5-4 | new rating: 1544 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1505 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 220 | Nakamura, Shou (1450) | Won 2-1 | +171522 |
| 2standard | 287 | Yoshimura, Naoki (1524) | Lost 0-2 | -181504 |
| 3standard | 1092 | Nagae, Kazuya (1427) | Won 2-1 | +161520 |
| 4standard | 852 | Aoshima, Satoshi (1445) | Won 2-1 | +171537 |
| 5standard | 301 | Nagano, Reo (1576) | Won 2-1 | +191556 |
| 6standard | 350 | Maruyama, Masaaki (1516) | Lost 0-2 | -191537 |
| 7standard | 471 | Ookubo, Keisuke (1538) | Won 2-0 | +181555 |
| 8standard | 265 | Kuramachi, Ryo (1557) | Won 2-0 | +181573 |
| 9standard | 114 | Ichikawa, Tomokazu (1510) | Lost 0-2 | -191554 |
| 10standard | 359 | Fujimoto, Daiki (1558) | Lost 0-2 | -181536 |
| 11standard | 431 | Fujino, Masashi (1572) | Won 2-0 | +191555 |
| 12standard | 296 | Arai, Tadayuki (1577) | Lost 0-2 | -181537 |
| top | average opponent: 1521record: 7-5 | new rating: 1537 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1468 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 254 | Kondo, Yusuke (1515) | Won 2-1 | +191487 |
| 2sealed | 80 | Shigehara, Toshinori (1885) | Lost 1-2 | -111476 |
| 3sealed | 618 | Juumonji, Ryou (1699) | Lost 1-2 | -141462 |
| 4sealed | 979 | Nose, Kouta (1511) | Won 2-0 | +191481 |
| 5sealed | 686 | Ikeda, Kazuki (1522) | Lost 1-2 | -181463 |
| 6sealed | 876 | Takahashi, Muneaki (1461) | Won 2-0 | +181481 |
| 7sealed | 616 | Matsui, Hideyuki (1511) | Won 2-1 | +191500 |
| 8sealed | 626 | Matsumura, Takehiko (1608) | Won 2-0 | +201520 |
| 9sealed | 514 | Kawashita, Makoto (1671) | Lost 1-2 | -151505 |
| top | average opponent: 1598record: 5-4 | new rating: 1505 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 2047 | Morishita, Taiki (1531) | Lost 1-2 | -171483 |
| 2sealed | 2307 | Fujino, Yusuke (1482) | Won 2-0 | +181501 |
| 3sealed | 2390 | Suzuki, Kazushige (1713) | Lost 0-2 | -151486 |
| 4sealed | 2392 | Sorgi, Davide (1465) | Lost 0-2 | -181468 |
| top | average opponent: 1548record: 1-3 | new rating: 1468 | ||