Oka, Yoshimasa
Current rating: 1464
Record: 4-6
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1519 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 2190 | Horikoshi, Yuki (1500) | Lost 0-2 | -181501 |
| 2sealed | 2273 | Iitsuka, Satoshi (1481) | Lost 0-2 | -181483 |
| 3sealed | 2479 | Satou, Kentarou (1446) | Lost 1-2 | -191464 |
| average opponent: 1476record: 0-3 | new rating: 1464 | |||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 711 | N., Kazuma (1500) | Won 2-1 | +181518 |
| 2sealed | 881 | Kojima, Toshihiro (1366) | Won 2-0 | +151533 |
| 3sealed | 832 | Yao, Chris (1530) | Lost 1-2 | -181515 |
| 4sealed | 837 | Penel, Francois (1514) | Lost 1-2 | -181497 |
| 5sealed | 920 | Kobayashi, Shougo (1376) | Won 2-1 | +161513 |
| 6sealed | 941 | Aryabhima, Rahman (1749) | Won 2-0 | +221535 |
| 7sealed | 755 | Murakami, Keita (1652) | Lost 1-2 | -161519 |
| average opponent: 1527record: 4-3 | new rating: 1519 | |||