Kahata, Issei
Current rating: 1442
Record: 33-42-1
| Grand Prix Nagoya 2020 (pioneer) | starting rating: 1430 | |||
| round | table | opponent (rating) | result | Δrating |
| 2pioneer | 158 | Yamamura, Yuma (1805) | Lost 1-2 | -121418 |
| 3pioneer | 475 | Ishikawa, Ryota (1491) | Lost 1-2 | -161402 |
| 4pioneer | 682 | Ooboshi, Katsunori (1474) | Lost 0-2 | -171385 |
| 5pioneer | 669 | Aono, Ryo (1429) | Won 2-0 | +191404 |
| 6pioneer | 547 | Komatsu, Yuuhei (1524) | Won 2-0 | +201424 |
| 7pioneer | 486 | Kikuchi, Kota (1425) | Won 2-0 | +181442 |
| top | average opponent: 1525record: 3-3 | new rating: 1442 | ||
| Grand Prix Nagoya 2019 (ELD standard) | starting rating: 1432 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 10 | Yoshimoto, Masanobu (1598) | Won 2-1 | +211453 |
| 3standard | 64 | Kusunoki, Iori (1483) | Won 2-1 | +191472 |
| 4standard | 108 | Ogawa, Shota (1724) | Lost 1-2 | -141458 |
| 5standard | 310 | Nakashima, Takumi (1584) | Lost 0-2 | -161442 |
| 6standard | 306 | Watanabe, Takanori (1754) | Lost 0-2 | -121430 |
| top | average opponent: 1629record: 2-3 | new rating: 1430 | ||
| Grand Prix Shizuoka 2018 (standard) (GRN standard) | starting rating: 1506 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 443 | Kadowaki, Tatsuya (1462) | Lost 1-2 | -191487 |
| 2standard | 815 | Futada, Takahiro (1456) | Lost 1-2 | -191468 |
| 3standard | 1106 | Naono, Shuichi (1372) | Lost 1-2 | -201448 |
| 4standard | 1046 | Shiraishi, Masaharu (1621) | Lost 0-2 | -141434 |
| 5standard | 1020 | Morisawa, Kazuki (1428) | Won 2-0 | +171451 |
| 6standard | 902 | Kitajima, Hiroyasu (1377) | Lost 1-2 | -191432 |
| top | average opponent: 1453record: 1-5 | new rating: 1432 | ||
| Grand Prix Shizuoka 2018 (legacy) (legacy) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 252 | Ito, Fumitaka (1466) | Lost 0-2 | -181447 |
| 2legacy | 462 | Kimura, Yuu1332 (1396) | Won 2-0 | +171464 |
| 3legacy | 431 | Daigen, Yuto (1500) | Lost 1-2 | -171447 |
| 4legacy | 592 | Oda, Ryutaro (1515) | Lost 1-2 | -171430 |
| 5legacy | 563 | Moriya, Taiki (1467) | Won 2-0 | +181448 |
| 6legacy | 537 | Yamamoto, Masaki 5609 (1482) | Won 2-0 | +191467 |
| 7legacy | 304 | Ozaki, Kei (1475) | Won 2-0 | +181485 |
| 8legacy | 302 | Hasegawa, Tsuyoshi (1612) | Won 2-1 | +211506 |
| top | average opponent: 1489record: 5-3 | new rating: 1506 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1503 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 28 | Takase, Yusuke (1418) | Lost 1-2 | -201483 |
| 2sealed | 818 | Ishino, Katsunori (1452) | Lost 1-2 | -181465 |
| 3sealed | 1171 | Takao, Naoki (1467) | Lost 1-2 | -181447 |
| 4sealed | 1095 | Matsuzawa, Ryo (1447) | Won 2-1 | +181465 |
| top | average opponent: 1446record: 1-3 | new rating: 1465 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1456 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 201 | Adachi, Yoshizumi (1405) | Won 2-0 | +171473 |
| 3sealed | 116 | Popitukgul, Sutipong (1713) | Won 2-1 | +221495 |
| 4sealed | 253 | Machii, Takuto (1518) | Won 2-0 | +181513 |
| 5sealed | 3 | Stankey, Matt (1755) | Won 2-1 | +231536 |
| 6sealed | 70 | Kinoshita, Atsushi (1592) | Lost 1-2 | -171519 |
| 7sealed | 53 | Rountree, Collin (1935) | Lost 0-2 | -111508 |
| 8sealed | 161 | Shenhar, Shahar (1911) | Won 2-1 | +251533 |
| 9sealed | 151 | Yamaguchi, Shota (1534) | Draw 1-1 | 01533 |
| 10draft | 40 | Tsukahara, Kazuto (1633) | Lost 1-2 | -161517 |
| 11draft | 40 | Yamaguchi, Shota (1525) | Won 2-0 | +181535 |
| 12draft | 38 | Sato, Kimihiko (1676) | Lost 0-2 | -161519 |
| 13draft | 334 | Yamasaki, Takumi (1600) | Lost 1-2 | -161503 |
| top | average opponent: 1650record: 6-5-1 | new rating: 1503 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1412 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 684 | Nakai, Yoshito (1464) | Won 2-0 | +191431 |
| 2modern | 563 | Hirosawa, Yuuichirou (1520) | Lost 1-2 | -161415 |
| 3modern | 887 | Yamakawa, Yoshiyuki (1481) | Lost 1-2 | -171398 |
| 4modern | 1226 | Ohtsuka, Tomoki (1465) | Won 2-0 | +191417 |
| 5modern | 705 | Matsuura, Jo (1498) | Won 2-1 | +201437 |
| 6modern | 600 | Nitta, Ryou (1684) | Won 2-1 | +221459 |
| 7modern | 350 | Yamada, Mitsuhiro (1515) | Won 2-1 | +191478 |
| 8modern | 313 | Miyamoto, Yutaro (1620) | Lost 1-2 | -151463 |
| 9modern | 583 | Kakinokida, Takuhito (1589) | Won 2-1 | +201483 |
| 10modern | 211 | Morotome, Ken (1642) | Won 2-1 | +211504 |
| 11modern | 168 | Otsuka, Tomohito (1723) | Lost 1-2 | -141490 |
| 12modern | 267 | Kouno, Masami (1554) | Lost 0-2 | -171473 |
| 13modern | 255 | Ueda, Motoi (1508) | Lost 1-2 | -171456 |
| top | average opponent: 1559record: 7-6 | new rating: 1456 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1384 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 313 | Kikuchi, Takashi (1337) | Lost 1-2 | -191365 |
| 2standard | 708 | Fukumoto, Syuuma (1340) | Lost 0-2 | -181347 |
| 3standard | 1237 | Toyoda, Ryosuke (1374) | Won 2-0 | +181365 |
| 4standard | 999 | Motegi, Ryouta (1477) | Won 2-0 | +201385 |
| 5standard | 967 | Sugimoto, Hiroaki (1586) | Won 2-1 | +221407 |
| 6standard | 667 | Nishikawa, Shigeki (1257) | Won 2-1 | +151422 |
| 7standard | 536 | Oonishi, Tatsuya (1577) | Won 2-1 | +211443 |
| 8standard | 178 | Nishiura, Ryosuke (1616) | Lost 0-2 | -151428 |
| 9standard | 424 | Yakuwa, Kathuhiko (1535) | Lost 0-2 | -161412 |
| top | average opponent: 1455record: 5-4 | new rating: 1412 | ||
| Grand Prix Chiba 2016 (legacy) | starting rating: 1448 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 569 | Maeda, Takayuki (1250) | Won 2-0 | +141462 |
| 4legacy | 70 | Yoshida, Yuuji (1664) | Lost 1-2 | -141448 |
| 5legacy | 456 | Itabashi, Ryo (1498) | Lost 1-2 | -171431 |
| 6legacy | 664 | Sashida, Tomoro (1619) | Lost 0-2 | -151416 |
| 7legacy | 815 | Kase, Masahito (1483) | Lost 1-2 | -161400 |
| 8legacy | 705 | Chin, Mouse (1547) | Lost 0-2 | -161384 |
| top | average opponent: 1510record: 1-5 | new rating: 1384 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 79 | Shirai, Kento (1537) | Lost 0-2 | -171464 |
| 4sealed | 187 | Lim, Ting Yong (1449) | Won 2-1 | +171481 |
| 5sealed | 139 | Shibata, Yasumasa (1397) | Lost 1-2 | -191462 |
| 6sealed | 309 | Nagao, Kengo (1688) | Lost 0-2 | -141448 |
| top | average opponent: 1518record: 1-3 | new rating: 1448 | ||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 83 | Tsutsumi, Kouhei (1483) | Won 2-0 | +181518 |
| 2sealed | 123 | Kanaya, Masatoshi (1489) | Lost 0-2 | -191499 |
| 3sealed | 332 | Nishikawa, Masayuki (1475) | Lost 0-2 | -181481 |
| top | average opponent: 1482record: 1-2 | new rating: 1481 | ||