Yamamoto, Kosuke
Current rating: 1426
Record: 15-20
| Grand Prix Nagoya 2020 (pioneer) | starting rating: 1438 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 67 | Yamada, Takaaki (1634) | Lost 0-2 | -141424 |
| 2pioneer | 429 | Mogami, Yuko (1394) | Won 2-1 | +171441 |
| 3pioneer | 588 | Shinohara, Kazuaki (1624) | Lost 0-2 | -151426 |
| top | average opponent: 1551record: 1-2 | new rating: 1426 | ||
| Grand Prix Yokohama 2019 (modern) | starting rating: 1456 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 409 | Yufu, Seizi (1462) | Lost 0-2 | -181438 |
| top | record: 0-1 | new rating: 1438 | ||
| Grand Prix Shizuoka 2018 (legacy) (legacy) | starting rating: 1431 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 475 | Hatano, Kazaho (1500) | Won 2-1 | +191450 |
| 2legacy | 12 | Suzuki, Kento (1440) | Won 2-1 | +181468 |
| 3legacy | 280 | Sezume, Akihiro (1522) | Lost 1-2 | -171451 |
| 4legacy | 398 | Morishita, Takamitu (1516) | Lost 0-2 | -171434 |
| 5legacy | 453 | Mitani, Kento (1497) | Won 2-1 | +191453 |
| 6legacy | 295 | Okuno, Atsuya (1519) | Won 2-1 | +191472 |
| 7legacy | 120 | Shibata, Akira (1577) | Lost 0-2 | -161456 |
| top | average opponent: 1510record: 4-3 | new rating: 1456 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1427 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 610 | Tanimoto, Haruka (1501) | Lost 0-2 | -161411 |
| 2modern | 943 | Tsai, Shih Tsun (1395) | Lost 1-2 | -191392 |
| 3modern | 1264 | Sumida, Masashi (1462) | Lost 1-2 | -161376 |
| 4modern | 1265 | Kiyohara, Yuji (1289) | Won 2-0 | +161392 |
| 5modern | 1184 | Saito, Akihito (1466) | Won 2-0 | +191411 |
| 6modern | 980 | Nakano, Tomohiko (1464) | Won 2-1 | +191430 |
| 7modern | 784 | Mokudari, Masahiro (1409) | Won 2-0 | +181448 |
| 8modern | 741 | Umeda, Takuya (1484) | Lost 0-2 | -171431 |
| top | average opponent: 1434record: 4-4 | new rating: 1431 | ||
| Grand Prix Chiba 2016 (legacy) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 37 | Yamamoto, Shintaro (1448) | Lost 0-2 | -181446 |
| 2legacy | 563 | Akihiro, Kobayashi (1481) | Lost 0-2 | -181428 |
| 3legacy | 1105 | Gondou, Takayuki (1396) | Won 2-0 | +181446 |
| 4legacy | 895 | Tsujioka, Takeo (1420) | Lost 1-2 | -191427 |
| top | average opponent: 1436record: 1-3 | new rating: 1427 | ||
| Grand Prix Kobe 2015 (BFZ standard) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 416 | Nakamura, Yuuta4577 (1500) | Lost 0-2 | -181464 |
| top | record: 0-1 | new rating: 1464 | ||
| Grand Prix Kyoto 2015 (legacy) | starting rating: 1536 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 809 | Matsumata, Syusaku (1409) | Lost 0-2 | -201516 |
| 2legacy | 891 | Yamazaki, Hiroyuki (1585) | Lost 0-2 | -171499 |
| 3legacy | 937 | Takahashi, Ryouhei (1516) | Lost 1-2 | -171482 |
| top | average opponent: 1503record: 0-3 | new rating: 1482 | ||
| Grand Prix Kobe 2014 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 346 | Honda, Rintaro (1500) | Lost 0-2 | -181482 |
| 2modern | 444 | Honjo, Shuya (1519) | Won 2-0 | +191501 |
| 3modern | 404 | Sizuya, Hara (1499) | Won 2-1 | +181519 |
| 4modern | 328 | Kawaguchi, Takahiro (1563) | Lost 0-2 | -181501 |
| 5modern | 331 | Nishio, Masato (1501) | Won 2-0 | +181519 |
| 6modern | 278 | Abe, Tooru (1455) | Won 2-0 | +171536 |
| 7modern | 194 | Bingo, Yoshihiro (1543) | Won 2-0 | +181554 |
| 8modern | 106 | Kokufuda, Daisuke (1551) | Lost 0-2 | -181536 |
| top | average opponent: 1516record: 5-3 | new rating: 1536 | ||