Yamadaya, Kohei
Current rating: 1693
Record: 30-17-3 (GP) / 2-2-2 (professional)
| Grand Prix Shizuoka 2003 (MRD limited) | starting rating: 1641 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 15 | Oiso, Masashi (1960) | Won 2-0 | +231664 |
| 5sealed | 5 | Okada, Kou (1673) | Draw 0-0 | 01664 |
| 6sealed | 17 | Okada, Hiroaki (1590) | Lost 1-2 | -191645 |
| 7sealed | 46 | Saitou, Takahiro (1609) | Won 2-1 | +171662 |
| 8sealed | 27 | Nagaoka, Takayuki (1771) | Won 2-0 | +201682 |
| 9rochester | 10 | Ibamoto, Masami (1669) | Draw 1-1 | 01682 |
| 10rochester | 6 | Morita, Katsunobu (1563) | Won 2-1 | +161698 |
| 11rochester | 12 | Takahashi, Noboru (1567) | Won 1-0 | +161714 |
| 12rochester | 3 | Kondo, Takahiro (1613) | Won 2-0 | +161730 |
| 13rochester | 18 | Fujimoto, Mikio (1675) | Lost 0-2 | -191711 |
| 14rochester | 28 | Nakamura, Satoshi (1706) | Lost 0-2 | -181693 |
| top | average opponent: 1673record: 6-3-2 | new rating: 1693 | ||
| Grand Prix Yokohama 2003 (Onslaught block) | starting rating: 1659 | |||
| round | table | opponent (rating) | result | Δrating |
| 3block | 49 | Takano, Yasuhiro (1542) | Lost 1-2 | -201639 |
| 4block | 149 | Noda, Yasumasa (1518) | Won 2-0 | +151654 |
| 5block | 161 | Minami, Masashi (1634) | Won 2-0 | +181672 |
| 6block | 75 | Hirano, Kengo (1561) | Won 2-0 | +161688 |
| 7block | 22 | Takakuwa, Minoru (1593) | Won 2-0 | +161704 |
| 8block | 34 | Yasutomi, Hiroto (1603) | Won 2-1 | +161720 |
| 9block | 17 | Murayama, Yoshiyuki (1590) | Lost 0-2 | -201700 |
| 10block | 23 | Goto, Kosuke (1615) | Lost 0-2 | -201680 |
| 11block | 38 | Miwa, Tatsuya (1568) | Lost 0-2 | -201660 |
| 12block | 68 | Sasanuma, Kiyoshi (1559) | Lost 0-2 | -191641 |
| top | average opponent: 1578record: 5-5 | new rating: 1641 | ||
| Pro Tour Yokohama 2003 (LGN draft) | starting rating: 1665 | |||
| round | table | opponent (rating) | result | Δrating |
| 1draft | 66 | da Costa, Jorge (1554) | Won 2-1 | +161681 |
| 2draft | 101 | Wessels, Thijs (1453) | Draw 1-1 | -51676 |
| 3draft | 42 | Tessitori, Riccardo (1489) | Lost 0-2 | -211655 |
| 4draft | 55 | Wise, Gary (1909) | Lost 1-2 | -131642 |
| 5draft | 111 | Petit, Xavier (1587) | Draw 1-1 | -11641 |
| 6draft | 39 | Nakajima, Chikara (1643) | Won 2-1 | +181659 |
| top | average opponent: 1606record: 2-2-2 | new rating: 1659 | ||
| Grand Prix Utsunomiya 2002 (ONS rochester) | starting rating: 1690 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 8 | Tashiro, Hayato (1553) | Won 2-1 | +161706 |
| 4sealed | 24 | Ishibashi, Masashi (1444) | Won 2-0 | +131719 |
| 5sealed | 24 | Kiyota, Ken (1573) | Lost 1-2 | -211698 |
| 6sealed | 19 | Suzuki, Fumio (1481) | Lost 0-2 | -211677 |
| 7sealed | 62 | Yanagawa, Tomoyuki (1535) | Won 2-1 | +151692 |
| 8sealed | 91 | Mizuno, Masahito (1586) | Won 2-0 | +161708 |
| 9rochester | 32 | Andou, Koutarou (1627) | Lost 1-2 | -191689 |
| 10rochester | 27 | Ito, Ken (1619) | Lost 0-2 | -201669 |
| 11rochester | 30 | Bandou, Junichirou (1541) | Won 2-0 | +161685 |
| 12rochester | 26 | Tachibana, Satoshi (1551) | Lost 1-2 | -201665 |
| top | average opponent: 1551record: 5-5 | new rating: 1665 | ||
| Grand Prix Fukuoka 2002 (TOR limited) | starting rating: 1699 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 26 | Niwa, Toshiharu (1660) | Lost 1-2 | -191680 |
| 5sealed | 69 | Komiya, Tadayoshi (1598) | Lost 0-2 | -201660 |
| 6sealed | 89 | Tanaka, Noboru (1471) | Won 2-0 | +151675 |
| 7sealed | 74 | Morimoto, Manabu (1527) | Won 2-1 | +151690 |
| top | average opponent: 1564record: 2-2 | new rating: 1690 | ||
| Grand Prix Shizuoka 2001 (ODY limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 35 | Watanabe, Hiroshi (1413) | Draw 1-1 | -21498 |
| 4sealed | 71 | Higashi, Teppei (1570) | Lost 0-2 | -161482 |
| 5sealed | 141 | Ishikawa, Masaki (1534) | Won 2-0 | +191501 |
| 6sealed | 82 | Takeuchi, Hidehito (1523) | Won 2-1 | +181519 |
| 7sealed | 59 | Kubo, Tadayoshi (1479) | Won 2-1 | +171536 |
| 8sealed | 25 | Ouchi, Atsuo (1571) | Won 2-0 | +191555 |
| 9rochester | 20 | Higashi, Teppei (1620) | Won 2-0 | +191574 |
| 10rochester | 11 | Terada, Atsushi (1626) | Lost 1-2 | -171557 |
| 11rochester | 16 | Tsukamoto, Toshiki (1672) | Won 2-0 | +201577 |
| 12rochester | 10 | Terada, Atsushi (1624) | Won 2-0 | +191596 |
| 13rochester | 8 | Niwa, Toshiharu (1671) | Won 2-0 | +191615 |
| 14rochester | 5 | Hoshino, Hiroaki (1727) | Won 2-1 | +201635 |
| Qrochester | Mori, Katsuhiro (1959) | Won 2-1 | +241659 | |
| Srochester | Ruel, Olivier (1763) | Won 2-0 | +201679 | |
| Frochester | Morita, Masahiko (1763) | Won 2-1 | +201699 | |
| top | average opponent: 1634record: 12-2-1 | new rating: 1699 | ||