Koyama, Yu
Current rating: 1536
Record: 13-12
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1532 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 162 | Tajiri, Shinichi (1517) | Won 2-0 | +171549 |
| 3sealed | 369 | Tamoto, Akihiro (1532) | Won 2-1 | +181567 |
| 4sealed | 43 | Hasegawa, Tsuyoshi (1509) | Lost 0-2 | -191548 |
| 5sealed | 457 | Hieda, Ryu (1651) | Won 2-0 | +201568 |
| 6sealed | 281 | Wachi, Shinya (1709) | Lost 0-2 | -161552 |
| 7sealed | 434 | Oota, Yusuke (1612) | Lost 1-2 | -161536 |
| top | average opponent: 1588record: 3-3 | new rating: 1536 | ||
| Grand Prix Yokohama 2019 (modern) | starting rating: 1489 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 112 | Tamaki, Takuma (1486) | Lost 1-2 | -181471 |
| 2modern | 874 | Ishiwata, Hyuuma (1479) | Won 2-0 | +181489 |
| 3modern | 636 | Suganuma, Asaki (1499) | Won 2-1 | +181507 |
| 4modern | 326 | Tonobe, Shinichi (1517) | Won 2-1 | +181525 |
| 5modern | 285 | Hanyuu, Kento (1536) | Lost 1-2 | -171508 |
| 6modern | 712 | Fukuda, Masahiro (1521) | Won 2-1 | +181526 |
| 7modern | 311 | Kobayasi, Tomoya (1790) | Lost 0-2 | -141512 |
| 8modern | 515 | Kimura, Yu7770 (1579) | Won 2-0 | +201532 |
| top | average opponent: 1551record: 5-3 | new rating: 1532 | ||
| Grand Prix Shizuoka 2018 (standard) (GRN standard) | starting rating: 1526 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 511 | Oshima, Yuki (1657) | Lost 1-2 | -161510 |
| 2standard | 690 | Akita, Ryosuke (1460) | Lost 0-2 | -181492 |
| 3standard | 1008 | Shibata, Yuuya (1403) | Won 2-1 | +161508 |
| 4standard | 1025 | Teramoto, Junnosuke (1448) | Lost 1-2 | -191489 |
| top | average opponent: 1492record: 1-3 | new rating: 1489 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 265 | Makino, Yuuhei (1526) | Lost 0-2 | -181482 |
| 2sealed | 927 | Hirasawa, Tatsuya (1482) | Won 2-0 | +181500 |
| 3sealed | 987 | Haritani, Ryosuke (1538) | Won 2-1 | +191519 |
| 4sealed | 693 | Sorada, Shohei (1552) | Won 2-1 | +191538 |
| 5sealed | 224 | Iwazaki, Yuuta (1782) | Lost 0-2 | -141524 |
| 6sealed | 399 | Oku, Yusuke (1337) | Won 2-1 | +151539 |
| 7sealed | 411 | Nagao, Yasutaka (1842) | Lost 1-2 | -131526 |
| top | average opponent: 1580record: 4-3 | new rating: 1526 | ||