Saka, Koichiro
Current rating: 1381
Record: 2-9-3
| Grand Prix Kobe 2017 (modern) | starting rating: 1404 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 290 | Ono, Kentaro (1500) | Draw 1-1 | +21406 |
| 2modern | 633 | Koshiishi, Tadahito (1499) | Lost 1-2 | -161390 |
| 3modern | 1158 | Hakamata, Shou (1484) | Draw 1-1 | +21392 |
| 4modern | 1240 | Nishiyama, Kei (1481) | Lost 0-2 | -171375 |
| 5modern | 1257 | Mizuguchi, Chihiro (1461) | Won 2-0 | +201395 |
| 6modern | 1138 | Sato, Ryoji (1464) | Won 2-0 | +191414 |
| 7modern | 964 | Kajitani, Dai (1499) | Lost 0-2 | -161398 |
| 8modern | 904 | Hoshide, Naonari (1434) | Draw 1-1 | 01398 |
| 9modern | 808 | Hayano, Satosi (1463) | Lost 0-2 | -171381 |
| average opponent: 1476record: 2-4-3 | new rating: 1381 | |||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 74 | Nakabe, Ikki (1502) | Lost 1-2 | -181482 |
| 2standard | 739 | Ajitomi, Takeshi (1424) | Lost 0-2 | -191463 |
| 3standard | 1159 | Nakamura, Shun (1461) | Lost 0-2 | -181445 |
| 4standard | 1260 | Hirose, Yutaka (1282) | Lost 1-2 | -211424 |
| 5standard | 1244 | Toyoda, Ryosuke (1339) | Lost 1-2 | -201404 |
| average opponent: 1402record: 0-5 | new rating: 1404 | |||