Matsumoto, Kazuo
Current rating: 1451
Record: 4-7-4
| Grand Prix Yokohama 2012 (modern) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 343 | Koishihara, Akira (1500) | Lost 0-2 | -181447 |
| 2modern | 643 | Shoji, Taku (1482) | Won 2-1 | +191466 |
| 3modern | 414 | Okuma, Naoki (1500) | Lost 0-2 | -171449 |
| 4modern | 626 | Iimura, Taka (1482) | Won 2-1 | +181467 |
| 5modern | 402 | Kamei, Hiroto (1573) | Lost 1-2 | -161451 |
| 6modern | 496 | Yamazaki, Yuki (Nagano) (1465) | Draw 1-1 | 01451 |
| average opponent: 1500record: 2-3-1 | new rating: 1451 | |||
| Grand Prix Yokohama 2010 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 25 | Arahori, Kazuaki (1569) | Lost 1-2 | -171483 |
| 2extended | 294 | Mizuhara, Yoshitaka (1481) | Draw 1-1 | 01483 |
| 3extended | 383 | Iijima, Yutaka (1482) | Lost 0-2 | -181465 |
| 4extended | 469 | Kimoto, Keiya (1464) | Draw 1-1 | 01465 |
| 5extended | 432 | Tagashira, Yuusuke (1431) | Lost 1-2 | -181447 |
| 6extended | 372 | Mori, Takahiro (1445) | Won 2-1 | +181465 |
| 7extended | 285 | Sugita, Ei (1448) | Won 2-0 | +171482 |
| 8extended | 42 | Satou, Takahisa (1534) | Lost 1-2 | -171465 |
| 9extended | 157 | Mori, Masatake (1445) | Draw 1-1 | 01465 |
| average opponent: 1478record: 2-4-3 | new rating: 1465 | |||