Koyama, Tetsuo
Current rating: 1405
Record: 14-20-2
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1437 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 449 | Munekata, Yuuki (1539) | Lost 0-2 | -161421 |
| 2sealed | 667 | Hayashi, Naoki (1554) | Lost 0-2 | -161405 |
| top | average opponent: 1546record: 0-2 | new rating: 1405 | ||
| Grand Prix Yokohama 2012 (modern) | starting rating: 1452 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 474 | Nagai, Masaya (1500) | Won 2-0 | +191471 |
| 2modern | 325 | Fujii, Yuusaku (1500) | Lost 0-2 | -171454 |
| 3modern | 499 | Tatsurou Y., (1482) | Won 2-0 | +181472 |
| 4modern | 440 | Tanabe, Tomokazu (1522) | Lost 0-2 | -171455 |
| 5modern | 417 | Toriuchi, Daizo (1441) | Lost 0-2 | -181437 |
| top | average opponent: 1489record: 2-3 | new rating: 1437 | ||
| Grand Prix Kobe 2011 (extended) | starting rating: 1450 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 7 | Nozaki, Manabu (1500) | Lost 0-2 | -171433 |
| 2extended | 266 | T., Kazuki (1481) | Won 2-1 | +191452 |
| 3extended | 207 | Ueyama, Yuji (1411) | Won 2-1 | +181470 |
| 4extended | 160 | Sakamoto, Naoki (1376) | Won 2-1 | +161486 |
| 5extended | 63 | Ito, Tomoki (1544) | Lost 0-2 | -171469 |
| 6extended | 160 | Saijou, Yuuichi (1538) | Lost 0-2 | -171452 |
| top | average opponent: 1475record: 3-3 | new rating: 1452 | ||
| Grand Prix Yokohama 2010 (extended) | starting rating: 1470 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 387 | Kuramochi, Takashi (1327) | Won 2-0 | +151485 |
| 2extended | 37 | Shirai, Takayuki (1518) | Lost 0-2 | -171468 |
| 3extended | 206 | Tamura, Youhei (1466) | Won 2-0 | +181486 |
| 4extended | 207 | Suzuki, Hiroumi (1521) | Lost 0-2 | -181468 |
| 5extended | 361 | Sueyoshi, Tasuku (1483) | Lost 1-2 | -181450 |
| top | average opponent: 1463record: 2-3 | new rating: 1450 | ||
| Grand Prix Kobe 2009 (extended) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 26 | Nakamura, Yuichiro (1607) | Lost 0-2 | -161466 |
| 2extended | 215 | Takanashi, Kouji (1649) | Draw 1-1 | +41470 |
| 3extended | 203 | Nagae, Hiroyuki (1450) | Won 2-0 | +171487 |
| 4extended | 172 | French, Michael (1490) | Lost 1-2 | -181469 |
| 5extended | 211 | Sato, Takahiro (1480) | Draw 1-1 | +11470 |
| top | average opponent: 1535record: 1-2-2 | new rating: 1470 | ||
| Grand Prix Shizuoka 2008 (MOR standard) | starting rating: 1522 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 282 | Sugawara, Hajime (1500) | Lost 0-2 | -181504 |
| 2standard | 342 | Kojima, Toshihiro (1431) | Lost 1-2 | -201484 |
| 3standard | 376 | Miya, Toru (1464) | Won 2-0 | +181502 |
| 4standard | 275 | Sakamoto, Sakito (1513) | Won 2-0 | +181520 |
| 5standard | 199 | Masui, Noriaki (1461) | Lost 0-2 | -191501 |
| 6standard | 273 | Matsuyama, Hikaru (1440) | Lost 1-2 | -191482 |
| top | average opponent: 1468record: 2-4 | new rating: 1482 | ||
| Grand Prix Kyoto 2007 (PLC standard) | starting rating: 1541 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 239 | Ohara, Takashi (1489) | Lost 0-2 | -191522 |
| top | record: 0-1 | new rating: 1522 | ||
| Grand Prix Shizuoka 2001 (ODY limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 172 | Otsuka, Masaya (1500) | Won 2-0 | +181518 |
| 2sealed | 172 | Rikuno, Keito (1535) | Won 2-0 | +181536 |
| 3sealed | 3 | Nagaoka, Takayuki (1674) | Lost 0-2 | -151521 |
| 4sealed | 150 | Yagi, Wataru (1524) | Won 2-1 | +181539 |
| 5sealed | 106 | Juumonji, Tarou (1562) | Won 2-1 | +181557 |
| 6sealed | 27 | Hasegawa, Takumi (1661) | Lost 1-2 | -161541 |
| top | average opponent: 1576record: 4-2 | new rating: 1541 | ||