Koen, Yusuke
Current rating: 1582
Record: 39-39-3
| Grand Prix Yamagata 2006 (TSP limited) | starting rating: 1594 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 54 | Tashiro, Hayato (1531) | Won 2-0 | +171611 |
| 2sealed | 21 | Takahashi, Ryo (1517) | Won 2-1 | +161627 |
| 3sealed | 33 | Kanamura, Hiroyuki (1535) | Lost 0-2 | -191608 |
| 4sealed | 108 | Bernabeu-Edo, Jesus (1525) | Lost 0-2 | -201588 |
| 5sealed | 121 | Itoh, Akira (1501) | Won 2-0 | +161604 |
| 6sealed | 90 | Lim, Jeongmuk (1468) | Lost 1-2 | -201584 |
| 7sealed | 39 | Yabuki, Shunichi (1499) | Won 2-1 | +161600 |
| 8sealed | 67 | Yanagisawa, Tadahiro (1584) | Lost 1-2 | -181582 |
| top | average opponent: 1520record: 4-4 | new rating: 1582 | ||
| Grand Prix Matsuyama 2005 (BOK limited) | starting rating: 1558 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 87 | Yamasaki, Ippei (1500) | Won 2-0 | +171575 |
| 2sealed | 56 | Taniguchi, Yuusuke (1477) | Won 2-0 | +161591 |
| 3sealed | 24 | Mihara, Makihito (1854) | Lost 0-2 | -131578 |
| 4sealed | 108 | Kimura, Yoshihiro (1507) | Won 2-0 | +171595 |
| 5sealed | 47 | Su, Michael (1560) | Won 2-1 | +171612 |
| 6sealed | 25 | Toochika, Takayuki (1617) | Lost 0-2 | -181594 |
| 7sealed | 78 | Maeba, Hideaki (1774) | Lost 0-2 | -151579 |
| 8sealed | 73 | Kitamura, Kensuke (1397) | Won 2-0 | +151594 |
| top | average opponent: 1586record: 5-3 | new rating: 1594 | ||
| Grand Prix Yokohama 2004 (COK limited) | starting rating: 1489 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 108 | Sekine, Takeshi (1604) | Won 2-1 | +201509 |
| 2sealed | 135 | Yamada, Tsutomu (1626) | Won 2-1 | +201529 |
| 3sealed | 88 | Matsumura, Hideyuki (1532) | Won 2-1 | +181547 |
| 4sealed | 14 | Tabuchi, Atsushi (1733) | Won 2-1 | +211568 |
| 5sealed | 36 | Niimi, Kiyoaki (1624) | Won 2-1 | +191587 |
| 6sealed | 12 | Lee, Sung-Bum (1476) | Lost 1-2 | -201567 |
| 7sealed | 31 | Shimoji, Ai (1592) | Won 2-0 | +191586 |
| 8sealed | 111 | Kashima, Akihiro (1711) | ID | 01586 |
| 9rochester | 6 | Sakuma, Toshimitsu (1740) | Lost 0-1 | -151571 |
| 10rochester | 8 | Saito, Tomoya (1538) | Draw 1-1 | -11570 |
| 11rochester | 11 | Okada, Wataru (1696) | Lost 1-2 | -161554 |
| 12rochester | 26 | Saito, Tomoya (1521) | Lost 0-2 | -181536 |
| 13rochester | 23 | Kaplan, Lain (1652) | Draw 1-1 | +21538 |
| 14rochester | 26 | Kubota, Kenta (1658) | Won 2-0 | +201558 |
| top | average opponent: 1622record: 7-4-3 | new rating: 1558 | ||
| Grand Prix Shizuoka 2003 (MRD limited) | starting rating: 1433 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 217 | Nabatame, Makoto (1500) | Won 2-0 | +191452 |
| 2sealed | 41 | Kise, Masato (1706) | Won 2-1 | +231475 |
| 3sealed | 15 | Ito, Ken (1642) | Lost 1-2 | -151460 |
| 4sealed | 132 | Shimizu, Junji (1577) | Lost 0-2 | -161444 |
| 5sealed | 195 | Twarog, Eric (1535) | Won 2-1 | +201464 |
| 6sealed | 130 | Kanno, Atsushi (1668) | Lost 0-2 | -151449 |
| 7sealed | 131 | Matsui, Hiroyuki (1520) | Won 2-1 | +201469 |
| 8sealed | 84 | Murayama, Yoshiyuki (1588) | Won 2-0 | +201489 |
| top | average opponent: 1592record: 5-3 | new rating: 1489 | ||
| Grand Prix Kyoto 2003 (LGN limited) | starting rating: 1401 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 82 | Nakajima, Mikihito (1504) | Won 2-1 | +201421 |
| 2sealed | 12 | Nonaka, Kentarou (1483) | Lost 1-2 | -171404 |
| 3sealed | 239 | Iwade, Takashi (1554) | Draw 1-1 | +31407 |
| 4sealed | 196 | Yoshizawa, Hiromi (1417) | Won 2-0 | +181425 |
| 5sealed | 132 | Urata, Masayasu (1559) | Won 2-1 | +211446 |
| 6sealed | 80 | Shimizu, Hajime (1567) | Lost 0-2 | -161430 |
| 7sealed | 121 | Minematsu, Kouzou (1535) | Won 2-0 | +201450 |
| 8sealed | 147 | Facchini, Nullo (1522) | Lost 1-2 | -171433 |
| top | average opponent: 1518record: 4-3-1 | new rating: 1433 | ||
| Grand Prix Utsunomiya 2002 (ONS rochester) | starting rating: 1384 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 93 | Koyama, Yuki(Yokohama) (1500) | Lost 0-2 | -161368 |
| 2sealed | 270 | Sugiuchi, Jun (1481) | Won 2-1 | +201388 |
| 3sealed | 230 | Aoyama, Daisuke (1501) | Won 2-0 | +201408 |
| 4sealed | 115 | Kamei, Toru (1520) | Won 2-0 | +201428 |
| 5sealed | 73 | Deyama, Hirofumi (1525) | Lost 0-2 | -161412 |
| 6sealed | 149 | Shimizu, Akihiro (1608) | Lost 0-2 | -141398 |
| 7sealed | 121 | Katsuta, Souichi (1505) | Won 2-1 | +191417 |
| 8sealed | 86 | Kozakai, Yukio (1527) | Lost 0-2 | -161401 |
| top | average opponent: 1521record: 4-4 | new rating: 1401 | ||
| Grand Prix Sapporo 2002 (Odyssey block) | starting rating: 1405 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 29 | Ogami, Kenji (1621) | Won 2-0 | +221427 |
| 2block | 37 | Fujihira, Takashi (1514) | Lost 1-2 | -161411 |
| 3block | 118 | Naito, Kazuma (1536) | Lost 0-2 | -161395 |
| 4block | 185 | Tano, Fumiaki (1483) | Won 2-0 | +201415 |
| 5block | 153 | Kimura, Kosuke (1464) | Lost 1-2 | -181397 |
| 6block | 144 | Kano, Komei (1480) | Won 2-0 | +201417 |
| 7block | 101 | Ishikawa, Koji (1502) | Lost 0-2 | -171400 |
| 8block | 96 | Sato, Hidetaka (1483) | Lost 0-2 | -161384 |
| top | average opponent: 1510record: 3-5 | new rating: 1384 | ||
| Grand Prix Fukuoka 2002 (TOR limited) | starting rating: 1374 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 109 | Miyata, Satoshi (1500) | Won 2-1 | +201394 |
| 2sealed | 26 | Inanaga, Nobuyuki (1500) | Lost 1-2 | -161378 |
| 3sealed | 84 | Yoshida, Mitsutaka (1335) | Won 2-1 | +181396 |
| 4sealed | 74 | Miyazaki, Kazuhiro (1516) | Won 2-0 | +201416 |
| 5sealed | 64 | Otsubo, Yuji (1636) | Lost 0-2 | -141402 |
| 6sealed | 116 | Suzuki, Fumio (1507) | Won 2-1 | +201422 |
| 7sealed | 52 | Fukuchi, Takahiro (1509) | Lost 0-2 | -171405 |
| top | average opponent: 1500record: 4-3 | new rating: 1405 | ||
| Grand Prix Sendai 2001 (extended) | starting rating: 1502 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 8 | Kataoka, Michiaki (1446) | Lost 0-2 | -191483 |
| 2extended | 148 | Yoshida, Hiroshi (1482) | Lost 0-2 | -181465 |
| 3extended | 186 | Ida, Takahito (1463) | Lost 0-2 | -181447 |
| 4extended | 198 | Isuzugawa, Ryuji (1446) | Lost 0-2 | -181429 |
| 6extended | 169 | Tada, Koji (1409) | Lost 0-2 | -191410 |
| 7extended | 144 | Yamamoto, Takashi (1391) | Lost 1-2 | -181392 |
| 8extended | 125 | Watanabe, Norio (1410) | Lost 0-2 | -181374 |
| top | average opponent: 1435record: 0-7 | new rating: 1374 | ||
| Grand Prix Shizuoka 2001 (ODY limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 43 | Kakita, Masashi (1500) | Won 1-0 | +181518 |
| 2sealed | 104 | Suzuki, Kazuho (1482) | Won 2-0 | +171535 |
| 3sealed | 65 | Fujiwara, Yuichiro (1536) | Lost 1-2 | -181517 |
| 4sealed | 87 | Sawamura, Takuziro (1518) | Lost 0-2 | -181499 |
| 5sealed | 220 | Matsuo, Koichiro (1667) | Won 2-1 | +211520 |
| 6sealed | 155 | Nakajima, Chikara (1476) | Lost 0-2 | -181502 |
| top | average opponent: 1530record: 3-3 | new rating: 1502 | ||