Sumida, Kouji
Current rating: 1517
Record: 4-3
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 967 | Oosaki, Kenichi (1500) | Won 2-1 | +181518 |
| 2sealed | 894 | Ozawa, Tetsuya (1555) | Lost 1-2 | -171501 |
| 3sealed | 938 | Handa, Takuya (1499) | Won 2-1 | +181519 |
| 4sealed | 909 | Takahashi, Dai (1537) | Won 2-1 | +181537 |
| 5sealed | 736 | Ishii, Kuya (1537) | Won 2-0 | +181555 |
| 6sealed | 755 | Yasuda, Seita (1518) | Lost 1-2 | -191536 |
| 7sealed | 849 | Ono, Tomonori (1472) | Lost 1-2 | -191517 |
| average opponent: 1517record: 4-3 | new rating: 1517 | |||