Yamamoto, Kohei
Current rating: 1345
Record: 6-17
| Grand Prix Nagoya 2020 (pioneer) | starting rating: 1344 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 10 | Wakimoto, Syouma (1500) | Won 2-1 | +211365 |
| 2pioneer | 204 | Takahashi, Zen (1941) | Lost 1-2 | -91356 |
| 3pioneer | 710 | Hidano, Yu (1502) | Won 2-1 | +211377 |
| 4pioneer | 483 | Ida, Yuuji (1450) | Lost 0-2 | -171360 |
| 5pioneer | 502 | Nakajima, Ryouma (1539) | Lost 1-2 | -151345 |
| top | average opponent: 1587record: 2-3 | new rating: 1345 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1376 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 696 | Katoh, Wataru (1433) | Won 2-0 | +191395 |
| 2standard | 415 | Endo, Jun'Ichi (1742) | Lost 0-2 | -121383 |
| 3standard | 926 | Nakamura, Satoshi2634 (1402) | Lost 1-2 | -171366 |
| 4standard | 968 | Yamada, Masaki (1529) | Lost 1-2 | -151351 |
| 5standard | 1081 | Uematu, Shunta (1463) | Lost 0-2 | -161335 |
| 6standard | 1172 | Kimonji, Hiroki (1514) | Won 2-0 | +211356 |
| 7standard | 1029 | Hirayama, Souya (1482) | Won 2-0 | +201376 |
| 8standard | 885 | Jackel, Stephen (1484) | Lost 0-2 | -161360 |
| 9standard | 762 | Mori, Kazuaki (1445) | Lost 0-2 | -161344 |
| top | average opponent: 1499record: 3-6 | new rating: 1344 | ||
| Grand Prix Kobe 2011 (extended) | starting rating: 1447 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 71 | Iwatsuki, Yoshifumi (1508) | Lost 1-2 | -171430 |
| 2extended | 239 | K., Takashi (1523) | Lost 1-2 | -171413 |
| 3extended | 274 | M., Hiroshi (1443) | Lost 0-2 | -171396 |
| 4extended | 322 | Tanabe, Kazuya (1199) | Lost 0-2 | -221374 |
| 5extended | 297 | Shinzawa, Masahito (1425) | Won 2-1 | +191393 |
| 6extended | 246 | Yamamuro, Yuusuke (1447) | Lost 0-2 | -171376 |
| top | average opponent: 1424record: 1-5 | new rating: 1376 | ||
| Grand Prix Kyoto 2000 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 192 | Sumitomo, Hiroyuki (1500) | Lost 1-2 | -181482 |
| 2extended | 232 | Fukuchi, Takahiro (1516) | Lost 0-2 | -171465 |
| 3extended | 327 | Okada, Morimichi (1464) | Lost 0-2 | -181447 |
| top | average opponent: 1493record: 0-3 | new rating: 1447 | ||