Koyama, Shohei
Current rating: 1488
Record: 18-19-2
| Grand Prix Yokohama 2004 (COK limited) | starting rating: 1506 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 52 | Kobayashi, Kota (1520) | Won 2-0 | +181524 |
| 2sealed | 58 | Sato, Minoru (1518) | Lost 1-2 | -181506 |
| 3sealed | 175 | Aizawa, Takeshi (1499) | Lost 0-2 | -181488 |
| top | average opponent: 1512record: 1-2 | new rating: 1488 | ||
| Grand Prix Sendai 2004 (DST limited) | starting rating: 1487 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 69 | Inoguchi, Hironobu (1487) | Won 2-0 | +181505 |
| 2sealed | 51 | Iizuka, Shun (1495) | Won 2-0 | +181523 |
| 3sealed | 1 | Tsuchiya, Heinrich (1571) | Lost 0-2 | -171506 |
| 4sealed | 124 | Shiota, Fumihiko (1502) | Lost 1-2 | -181488 |
| 5sealed | 158 | Aizawa, Atsuo (1497) | Draw 1-1 | 01488 |
| 6sealed | 138 | Matsuyama, Satoshi (1465) | Won 2-0 | +171505 |
| 7sealed | 104 | Goto, Noriyuki (1519) | Lost 1-2 | -171488 |
| 8sealed | 97 | Kasagi, Daisuke (1501) | Won 2-1 | +181506 |
| top | average opponent: 1505record: 4-3-1 | new rating: 1506 | ||
| Grand Prix Sapporo 2002 (Odyssey block) | starting rating: 1503 | |||
| round | table | opponent (rating) | result | Δrating |
| 2block | 104 | Nishiwaki, Akito (1540) | Lost 1-2 | -171486 |
| 3block | 162 | Ishimaru, Ken (1482) | Lost 0-2 | -181468 |
| 4block | 200 | Iwabuchi, Kazuho (1480) | Won 2-0 | +181486 |
| 5block | 140 | Muramatsu, Daisuke (1485) | Won 2-1 | +181504 |
| 6block | 74 | Yamauchi, Takashi (1503) | Lost 1-2 | -181486 |
| 7block | 120 | Hayashi, Chikara (1523) | Won 2-0 | +191505 |
| 8block | 44 | Mori, Takashi (1516) | Lost 0-2 | -181487 |
| top | average opponent: 1504record: 3-4 | new rating: 1487 | ||
| Grand Prix Fukuoka 2002 (TOR limited) | starting rating: 1485 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 9 | Suzue, Kota (1500) | Won 2-0 | +181503 |
| 2sealed | 30 | Yoshida, Mitsutaka (1350) | Won 2-1 | +151518 |
| 3sealed | 37 | Ueta, Hiroki (1575) | Lost 1-2 | -171501 |
| 4sealed | 73 | Miura, Tadayuki (1517) | Won 2-0 | +181519 |
| 5sealed | 73 | Nonishi, Keiichiro (1576) | Lost 1-2 | -171502 |
| 6sealed | 87 | Inanaga, Nobuyuki (1502) | Lost 0-2 | -181484 |
| 7sealed | 121 | Watanabe, Masanari (1529) | Won 2-1 | +191503 |
| top | average opponent: 1507record: 4-3 | new rating: 1503 | ||
| Grand Prix Shizuoka 2001 (ODY limited) | starting rating: 1498 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 17 | Yagi, Wataru (1524) | Lost 0-2 | -171481 |
| 3sealed | 244 | Kurobane, Kyuuya (1549) | Lost 0-2 | -171464 |
| 4sealed | 283 | Suzuki, Michihiro (1480) | Lost 1-2 | -181446 |
| 5sealed | 249 | Ito, Ryota (1464) | Won 2-1 | +191465 |
| 6sealed | 192 | Nakazawa, Kazuhiro (1530) | Won 2-1 | +191484 |
| 7sealed | 143 | Katsuyama, Kenichi (1501) | Lost 0-2 | -181466 |
| 8sealed | 124 | Tsuruta, Tomoo (1484) | Won 2-0 | +191485 |
| top | average opponent: 1505record: 3-4 | new rating: 1485 | ||
| Grand Prix Sapporo 2000 (PCY limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 44 | Sumita, Masanobu (1500) | Draw 1-1 | 01500 |
| 2sealed | 64 | Wang, Ming Chee (1423) | Lost 0-2 | -191481 |
| 3sealed | 107 | Guerrette, Chris (1465) | Lost 0-2 | -191462 |
| 4sealed | 117 | Goto, Akira (1464) | Won 2-0 | +181480 |
| 5sealed | 97 | Miura, Yohei (1482) | Lost 0-1 | -181462 |
| 6sealed | 102 | Asahi, Yuta (1463) | Won 2-0 | +181480 |
| 7sealed | 84 | Kiuchi, Masahiro (1482) | Won 2-0 | +181498 |
| top | average opponent: 1468record: 3-3-1 | new rating: 1498 | ||