Iizuka, Shun
Current rating: 1584
Record: 40-34
Grand Prix Kobe 2001Grand Prix Kyoto 2003Grand Prix Yokohama 2003Grand Prix Shizuoka 2003Grand Prix Sendai 2004Grand Prix Nagoya 2004Grand Prix Yokohama 2004Grand Prix Matsuyama 2005Grand Prix Niigata 2005Grand Prix Yamagata 2006Grand Prix Kobe 2008Grand Prix Niigata 2009Grand Prix Kobe 2012Grand Prix Yokohama 2013
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1612 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 887 | Mizutani, Naoki (1593) | Lost 0-2 | -181594 |
| 2sealed | 1076 | Yoshida, Mitsutaka (1207) | Won 2-0 | +111605 |
| 3sealed | 888 | Tsuneda, Masatoshi (1422) | Lost 0-2 | -211584 |
| top | average opponent: 1407record: 1-2 | new rating: 1584 | ||
| Grand Prix Kobe 2012 (DKA limited) | starting rating: 1616 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 247 | Muraoka, Hiroaki (1500) | Won 2-1 | +151631 |
| 2sealed | 209 | Yamauchi, Takashi (1572) | Lost 1-2 | -191612 |
| top | average opponent: 1536record: 1-1 | new rating: 1612 | ||
| Grand Prix Niigata 2009 (M10 limited) | starting rating: 1618 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 197 | Kasahara, Shinsuke (1500) | Won 2-1 | +161634 |
| 2sealed | 158 | Yanada, Kenji (1528) | Won 2-1 | +161650 |
| 3sealed | 84 | Murata, Daisuke (1597) | Lost 1-2 | -191631 |
| 4sealed | 132 | Masuno, Ryosuke (1762) | Lost 1-2 | -151616 |
| top | average opponent: 1597record: 2-2 | new rating: 1616 | ||
| Grand Prix Kobe 2008 (Lorwyn block) | starting rating: 1661 | |||
| round | table | opponent (rating) | result | Δrating |
| 2block | 23 | Nakamura, Masaya (1546) | Lost 1-2 | -201641 |
| 3block | 198 | Moriyama, Masahiro (1390) | Lost 1-2 | -231618 |
| top | average opponent: 1468record: 0-2 | new rating: 1618 | ||
| Grand Prix Yamagata 2006 (TSP limited) | starting rating: 1674 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 68 | Kubota, Kenta (1678) | Lost 0-2 | -181656 |
| 3sealed | 107 | Moriyama, Masahiro (1448) | Won 2-0 | +151671 |
| 4sealed | 61 | Kikuchi, Kanji (1522) | Won 2-1 | +151686 |
| 5sealed | 68 | Bernabeu-Edo, Jesus (1545) | Won 2-1 | +151701 |
| 6sealed | 33 | Masuno, Ryosuke (1697) | Lost 1-2 | -181683 |
| 7sealed | 57 | Sato, Daisuke (1434) | Lost 0-2 | -221661 |
| top | average opponent: 1554record: 3-3 | new rating: 1661 | ||
| Grand Prix Niigata 2005 (Kamigawa block) | starting rating: 1695 | |||
| round | table | opponent (rating) | result | Δrating |
| 3block | 17 | Kumagai, Shinichi (1616) | Won 2-1 | +161711 |
| 4block | 47 | Mori, Katsuhiro (1907) | Lost 1-2 | -141697 |
| 5block | 61 | Furuuchi, Tooru (1450) | Lost 1-2 | -231674 |
| top | average opponent: 1658record: 1-2 | new rating: 1674 | ||
| Grand Prix Matsuyama 2005 (BOK limited) | starting rating: 1675 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 20 | Hasegawa, Gaku (1476) | Won 2-0 | +141689 |
| 5sealed | 6 | Higashino, Masayuki (1755) | Won 2-1 | +191708 |
| 6sealed | 9 | Miki, Sadayoshi (1576) | Won 2-0 | +161724 |
| 7sealed | 5 | Koyama, Kenta (1591) | Lost 0-2 | -211703 |
| 8sealed | 8 | Mino, Tetsuya (1529) | Won 2-0 | +151718 |
| 9draft | 9 | Mouri, Takemasa (1749) | Won 2-0 | +191737 |
| 10draft | 5 | Oiso, Masashi (2046) | Lost 1-2 | -131724 |
| 11draft | 12 | Saito, Tomoharu (1853) | Lost 0-2 | -151709 |
| 12draft | 12 | Yasooka, Shota (1773) | Won 2-1 | +191728 |
| 13draft | 3 | Yanagi, Hiroki (1674) | Lost 0-2 | -191709 |
| 14draft | 28 | Ishida, Itaru (1918) | Lost 1-2 | -141695 |
| top | average opponent: 1722record: 6-5 | new rating: 1695 | ||
| Grand Prix Yokohama 2004 (COK limited) | starting rating: 1718 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 15 | Aizawa, Keiji (1683) | Lost 0-2 | -191699 |
| 5sealed | 51 | Kitayama, Masaya (1474) | Lost 0-2 | -221677 |
| 6sealed | 123 | Miyauchi, Makoto (1572) | Won 2-1 | +161693 |
| 7sealed | 95 | Ogawa, Syunsuke (1658) | Lost 0-2 | -181675 |
| top | average opponent: 1597record: 1-3 | new rating: 1675 | ||
| Grand Prix Nagoya 2004 (5DN standard) | starting rating: 1559 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 15 | Sugano, Yuuiti (1517) | Won 2-1 | +171576 |
| 3standard | 71 | Takahashi, Keiji (1483) | Won 2-1 | +161592 |
| 4standard | 33 | Tomihara, Shinsuke (1627) | Won 2-1 | +191611 |
| 5standard | 58 | Okamoto, Hiroki (1584) | Lost 1-2 | -191592 |
| 6standard | 95 | Kobayashi, Masanori(Okayama) (1464) | Won 2-1 | +161608 |
| 7standard | 60 | Arahori, Kazuaki (1612) | Won 2-1 | +181626 |
| 8standard | 42 | Kurisu, Takashi (1600) | Won 2-0 | +181644 |
| 9standard | 13 | Inoue, Yu (1575) | Won 2-1 | +161660 |
| 10standard | 36 | Kashiwa, Tatsuya (1592) | Lost 1-2 | -191641 |
| 11standard | 57 | Suzuoka, Toshimitsu (1605) | Won 2-1 | +171658 |
| 12standard | 5 | Nakamura, Shuhei (1881) | Won 2-1 | +221680 |
| 13standard | 27 | Suzuki, Takahiro (1624) | Won 2-1 | +171697 |
| 14standard | 50 | Mihara, Makihito (1864) | Won 2-0 | +211718 |
| 15standard | 12 | Takeshita, Toru (1631) | ID | 01718 |
| Qstandard | Takeshita, Toru (1631) | Won 2-1 | +171735 | |
| Sstandard | Kishi, Tatsunori (1790) | Lost 1-2 | -171718 | |
| top | average opponent: 1630record: 12-3-1 | new rating: 1718 | ||
| Grand Prix Sendai 2004 (DST limited) | starting rating: 1495 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 51 | Koyama, Shohei (1505) | Lost 0-2 | -171478 |
| 3sealed | 95 | Takasaki, Yuichi (1595) | Won 2-1 | +201498 |
| 4sealed | 135 | Nikkuni, Fumihito (1538) | Won 2-0 | +181516 |
| 5sealed | 95 | Takanashi, Yoshiki (1491) | Won 2-0 | +181534 |
| 6sealed | 22 | Higono, Naoki (1630) | Won 2-0 | +201554 |
| 7sealed | 34 | Ibamoto, Masami (1765) | Lost 1-2 | -141540 |
| 8sealed | 58 | Hosaka, Atsushi (1593) | Won 2-1 | +191559 |
| top | average opponent: 1588record: 5-2 | new rating: 1559 | ||
| Grand Prix Shizuoka 2003 (MRD limited) | starting rating: 1506 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 27 | Ota, Yusuke (1610) | Lost 0-2 | -161490 |
| 3sealed | 219 | Akita, Naoto (1506) | Won 2-0 | +181508 |
| 4sealed | 96 | Nakamura, Masanori (1645) | Won 2-1 | +211529 |
| 5sealed | 49 | Ishikawa, Ren (1661) | Lost 0-2 | -161513 |
| 6sealed | 86 | Kinoshita, Atsushi (1522) | Lost 0-2 | -181495 |
| top | average opponent: 1589record: 2-3 | new rating: 1495 | ||
| Grand Prix Yokohama 2003 (Onslaught block) | starting rating: 1540 | |||
| round | table | opponent (rating) | result | Δrating |
| 3block | 113 | Maki, Koichiro (1737) | Lost 1-2 | -151525 |
| 4block | 99 | Yamaguchi, Kazuki (1518) | Won 2-0 | +181543 |
| 5block | 160 | Mochizuki, Yuki (1427) | Lost 1-2 | -201523 |
| 6block | 200 | Yun, Suhan (1582) | Lost 0-2 | -171506 |
| top | average opponent: 1566record: 1-3 | new rating: 1506 | ||
| Grand Prix Kyoto 2003 (LGN limited) | starting rating: 1540 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 166 | Sogabe, Ippei (1578) | Won 2-1 | +191559 |
| 2sealed | 107 | Gotoh, Kaoru (1518) | Lost 1-2 | -191540 |
| top | average opponent: 1548record: 1-1 | new rating: 1540 | ||
| Grand Prix Kobe 2001 (Invasion block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2block | 158 | Yamane, Masakazu (1535) | Won 2-0 | +191519 |
| 3block | 80 | Biwaki, Toshiaki (1578) | Won 2-0 | +191538 |
| 4block | 67 | Shvartsman, Alex (1630) | Won 2-1 | +191557 |
| 5block | 63 | Hayashi, Shinsuke (1597) | Won 2-1 | +191576 |
| 6block | 26 | Yasutomi, Hiroto (1552) | Lost 1-2 | -181558 |
| 7block | 66 | Fujioka, Taishi (1571) | Lost 1-2 | -181540 |
| top | average opponent: 1577record: 4-2 | new rating: 1540 | ||