Yamamoto, Kohei 0859
Current rating: 1456
Record: 15-19
| Grand Prix Nagoya 2019 (ELD standard) | starting rating: 1455 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 95 | Maryu, Sotaro (1474) | Lost 1-2 | -181437 |
| 3standard | 499 | Shinada, Ren (1500) | Lost 0-2 | -171420 |
| 4standard | 688 | Hazu, Masaki (1475) | Won 2-0 | +191439 |
| 5standard | 659 | Ogsawara, Akira (1336) | Won 2-1 | +171456 |
| 6standard | 444 | Sakuta, Ryosuke (1483) | Won 2-0 | +181474 |
| 7standard | 354 | Takeda, Noriaki (1445) | Lost 1-2 | -181456 |
| top | average opponent: 1452record: 3-3 | new rating: 1456 | ||
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1509 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 8 | Yamada, Ryuhei (1511) | Lost 0-2 | -181491 |
| 3sealed | 734 | Ishikawa, Ryosuke (1523) | Lost 1-2 | -181473 |
| 4sealed | 1011 | Ishizaki, Ren (1483) | Won 2-1 | +181491 |
| 5sealed | 644 | Oozeki, Baku (1563) | Lost 0-2 | -161475 |
| 6sealed | 774 | Kawaharada, Kosaku (1376) | Lost 0-2 | -201455 |
| top | average opponent: 1491record: 1-4 | new rating: 1455 | ||
| Grand Prix Yokohama 2019 (modern) | starting rating: 1541 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 147 | Takesue, Chikara (1749) | Lost 1-2 | -141527 |
| 3modern | 714 | Hayakawa, Yohei (1490) | Lost 0-2 | -191508 |
| 4modern | 850 | Kogure, Naoto (1476) | Won 2-0 | +171525 |
| 5modern | 868 | Takamura, Kazuki (1602) | Lost 1-2 | -161509 |
| top | average opponent: 1579record: 1-3 | new rating: 1509 | ||
| Grand Prix Shizuoka 2018 (standard) (GRN standard) | starting rating: 1461 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 257 | Oohashi, Yoshihiro (1500) | Won 2-1 | +191480 |
| 2standard | 538 | Kondou, Masaki (1420) | Lost 1-2 | -191461 |
| 3standard | 731 | Tamano, Yuuki (1475) | Won 2-0 | +181479 |
| 4standard | 587 | Akita, Naoto (1476) | Won 2-1 | +181497 |
| 5standard | 530 | Yamaguchi, Koutarou (1633) | Won 2-0 | +211518 |
| 6standard | 398 | Kuroda, Yoshirou (1429) | Won 2-1 | +161534 |
| 7standard | 239 | Kim, Seok Hyun (1466) | Lost 0-2 | -191515 |
| 8standard | 414 | Fujiwara, Mizuki (1523) | Won 2-1 | +181533 |
| 9standard | 119 | Takahashi, Taro (1601) | Won 2-1 | +191552 |
| 10standard | 99 | Kagami, Hajime (1629) | Won 2-0 | +201572 |
| 11standard | 72 | Ooura, Masaki (1611) | Lost 0-2 | -181554 |
| 12standard | 51 | Takimura, Kazuyuki (2040) | Lost 1-2 | -91545 |
| 13standard | 83 | Naide, Kazutaka (1751) | Won 2-1 | +211566 |
| 14standard | 57 | Yamamoto, Kentaro (1914) | Lost 0-2 | -121554 |
| 15standard | 102 | Takahashi, Jun (1798) | Lost 1-2 | -131541 |
| top | average opponent: 1618record: 9-6 | new rating: 1541 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 221 | Yasukawa, Akira (1500) | Lost 0-2 | -181482 |
| 2sealed | 648 | Van Cleef, David (1355) | Lost 0-2 | -201462 |
| 3sealed | 1080 | Takatsuka, Yuuki (1506) | Lost 1-2 | -171445 |
| 4sealed | 1114 | Takayama, Ryou (1385) | Won 2-1 | +161461 |
| top | average opponent: 1437record: 1-3 | new rating: 1461 | ||