Koyama Jun (小山純)

Place: Tokyo, Japan

Rating: 2647.62, Std: 132.31, Rank: 45

First game: 2003-09-21, Last game: 2025-12-07

Top rating: 2649.74 (2025-10-19)

Games: 360, Wins: 207, Draws: 36, Losses: 117

Gy1: 7, Gy2: 11, Gy5: 15

26 Kanto Renju Emperor Tournament Final round
Date	2025-12-07		Rating	2647.62
Round	Color	Result	Opponent
1	Black	Loss	Inoue Fumiya	2583.89
2	Black	Loss	Kamiya Shunsuke	2861.65
3	Black	Win	Okabe Hiroshi	2723.18
4	White	Win	Yoshikawa Tomoki	2456.93
5	Black	Loss	Fujita Maiko	2490.35
6	White	Win	Maruta Hiroki	2255.09
7	Black	Win	Ono Takayuki	2392.04
26 Kanto Renju Emperor Tournament Qualification round
Date	2025-10-19		Rating	2649.74
Round	Color	Result	Opponent
1	White	Win	Ishitani Shin-ichi	2357.26
2	Black	Win	Kawamura Norihiko	2518.02
3	White	Win	Inoue Fumiya	2577.43
4	White	Draw	Fujita Maiko	2494.78
60th Meijinsen Qualification Kanto area 1st round
Date	2022-05-22		Rating	2611.86
Round	Color	Result	Opponent
1	White	Win	Tomobe Katsuhiro	2140.90
2	White	Win	Maruta Hiroki	2212.37
3	Black	Draw	Fujita Maiko	2424.68
4	Black	Draw	Yokoyama Shota	2455.66
57 Meijinsen Tournament
Date	2019-09-16		Rating	2615.09
Round	Color	Result	Opponent
1	Black	Draw	Inoue Fumiya	2422.44
2	White	Loss	Kamiya Shunsuke	2828.34
3	Black	Loss	Kawamura Norihiko	2674.50
4	White	Win	Matsuura Hiroshi	2364.34
5	Black	Loss	Nakayama Tomoharu	2829.77
6	White	Loss	Kawano Takahisa	2463.43
7	White	Loss	Hasegawa Kazuto	2616.49
8	White	Win	Okabe Hiroshi	2728.76
9	Black	Win	Ishitani Shin-ichi	2387.02
World Championship 2019, AT
Date	2019-08-10		Rating	2620.39
Round	Color	Result	Opponent
1	Black	Draw	Mei Fan	2708.99
2	Black	Win	Oll Aivo	2745.74
3	Black	Win	Inoue Fumiya	2426.49
4	Black	Win	Epifanov Dmitry	2674.50
5	Black	Loss	Nakayama Tomoharu	2824.13
6	Black	Win	Okabe Hiroshi	2724.07
7	Black	Draw	Kamiya Shunsuke	2825.25
8	Black	Draw	Gardström Petter	2704.05
9	White	Loss	Fedotov Denis	2683.72
10	White	Loss	Cao Dong	2786.21
11	Black	Loss	Sushkov Vladimir	2839.38
World Championship 2019, QT
Date	2019-08-02		Rating	2620.21
Round	Color	Result	Opponent
1	White	Win	Sandstrom Richard	2378.52
2	White	Win	Li Xiaoqing	2662.39
3	Black	Loss	Mesila Villem	2668.08
4	Black	Win	Wai Chan Keong	2790.47
5	Black	Draw	Fedotov Denis	2686.38
6	White	Loss	Gardström Petter	2705.70
7	White	Win	Topkin Georg-Romet	2629.76
57 Meijinsen Qualification East Japan area 2nd round
Date	2019-06-23		Rating	2613.55
Round	Color	Result	Opponent
1	Black	Win	Maruta Hiroki	2190.60
2	Black	Win	Maruta Koji	2145.96
3	White	Win	Inoue Fumiya	2429.92
4	Black	Win	Kusajima Masato	2261.50
5	White	Win	Ono Takayuki	2403.17
14th All Japan Championship
Date	2019-03-31		Rating	2592.60
Round	Color	Result	Opponent
1	White	Loss	Fujita Maiko	2292.71
2	Black	Win	Chigira Makoto	2094.19
3	White	Draw	Inoue Fumiya	2430.54
4	White	Win	Ono Takayuki	2401.55
5	Black	Loss	Nakamura Shigeru	2998.75
6	Black	Loss	Okabe Hiroshi	2703.33
19 Renju Emperor Tournament Kanto area 1st round
Date	2018-10-21		Rating	2573.85
Round	Color	Result	Opponent
1	Black	Win	Demachi Koichiro	1927.36
2	White	Loss	Iwano Fumio	2252.40
3	White	Draw	Ishitani Shin-ichi	2429.37
4	White	Loss	Inoue Fumiya	2409.07
56 Meijinsen Tournament
Date	2018-09-17		Rating	2576.54
Round	Color	Result	Opponent
1	Black	Win	Kuga Akio	2429.32
2	Black	Loss	Matsuura Hiroshi	2356.44
3	White	Win	Okabe Hiroshi	2704.95
5	Black	Win	Kawamura Norihiko	2662.39
6	Black	Loss	Ishitani Shin-ichi	2432.10
7	Black	Loss	Kamiya Shunsuke	2803.24
8	White	Loss	Nakamura Shigeru	3003.27
9	White	Win	Hasegawa Kazuto	2581.67
35 Kanto Championship
Date	2018-07-16		Rating	2579.15
Round	Color	Result	Opponent
4	Black	Loss	Sato Kiyotomi	2445.84
5	White	Win	Iwano Fumio	2253.13
6	White	Win	Fujikawa Masaki	2106.07
56 Meijinsen Qualification East Japan area 2nd round
Date	2018-06-25		Rating	2581.17
Round	Color	Result	Opponent
1	White	Win	Kusajima Masato	2309.40
2	Black	Win	Sato Kiyotomi	2446.48
3	White	Loss	Ono Takayuki	2394.71
56 Meijinsen Qualification Kanto area 1st round
Date	2018-05-13		Rating	2586.51
Round	Color	Result	Opponent
1	Black	Loss	Mitsumori Masao	2335.72
2	Black	Win	Iwano Fumio	2262.37
3	Black	Win	Maruta Hiroki	2158.44
4	White	Win	Sato Kiyotomi	2445.77
Team World Championship 2018
Date	2018-05-05		Rating	2587.76
Round	Color	Result	Opponent
1	Black	Win	Lillemaa Argo	2198.55
2	Black	Win	Purk Andry	2637.40
4	White	Win	Kachaev Denis	2544.22
5	Black	Win	Nikonov Konstantin	2694.28
6	Black	Win	Liu Yang	2639.85
7	White	Win	Lavrik-Karmazin Maksim	2501.65
8	White	Draw	Artemyev Sergey	2579.15
9	Black	Loss	Liu Yang	2639.85
10	White	Loss	Purk Andry	2637.40
13th All Japan Championship
Date	2018-01-28		Rating	2583.12
Round	Color	Result	Opponent
1	White	Loss	Ono Takayuki	2387.59
2	White	Loss	Ishitani Shin-ichi	2421.24
3	White	Loss	Miyamoto Syunju	2269.99
5	White	Win	Sato Kiyotomi	2437.08
6	Black	Win	Maruta Hiroki	2150.67
18 Kanto Renju Emperor Tournament 2nd round
Date	2017-12-17		Rating	2590.22
Round	Color	Result	Opponent
1	Black	Draw	Sato Kiyotomi	2439.95
2	Black	Win	Miyamoto Syunju	2275.76
3	Black	Loss	Nakamura Shigeru	2963.80
4	Black	Loss	Okabe Hiroshi	2723.29
5	White	Win	Kusajima Masato	2305.52
18 Kanto Renju Emperor Tournament 1st round
Date	2017-11-01		Rating	2599.64
Round	Color	Result	Opponent
1	Black	Win	Koyama Akihiro	1967.61
2	White	Draw	Okabe Hiroshi	2724.78
3	Black	Win	Ono Takayuki	2382.43
4	White	Win	Kusajima Masato	2301.65
World Championship 2017, BT
Date	2017-08-12		Rating	2611.07
Round	Color	Result	Opponent
1	Black	Win	Rahumägi Brenet	2332.18
2	Black	Win	Sun In	2433.45
3	Black	Draw	Liu Yang	2674.99
4	Black	Win	Lan Zhiren	2641.68
5	Black	Win	Yang Yu-Hsiung	2439.05
6	Black	Loss	Tang Kai Lam	2774.79
7	Black	Win	Topkin Georg-Romet	2526.89
8	White	Win	Huang Yen-Hua	2466.22
9	Black	Loss	Okabe Hiroshi	2724.18
World Championship 2017, QT
Date	2017-08-05		Rating	2610.98
Round	Color	Result	Opponent
1	White	Win	Rahumägi Brenet	2332.03
2	White	Win	Sushkov Vladimir	2877.53
3	Black	Loss	Lan Zhiren	2640.81
4	Black	Loss	Mei Fan	2700.30
5	White	Draw	Okabe Hiroshi	2724.26
6	Black	Win	Kim Su-chan	2312.63
7	Black	Win	Lu Wei-Yuan	2607.30
55 Meijinsen Qualification East Japan area 2nd round
Date	2017-06-11		Rating	2604.31
Round	Color	Result	Opponent
1	Black	Win	Tomobe Katsuhiro	2165.99
2	White	Loss	Tamada Yoichi	2542.11
3	White	Loss	Ono Takayuki	2379.91
4	Black	Win	Miyamoto Syunju	2272.64
5	Black	Loss	Sato Kiyotomi	2474.31
12th All Japan Championship
Date	2017-03-26		Rating	2610.79
Round	Color	Result	Opponent
1	Black	Win	Kusajima Masato	2290.38
2	Black	Loss	Nakamura Shigeru	2969.95
3	Black	Win	Ishitani Shin-ichi	2397.71
4	Black	Win	Nakayama Tomoharu	2797.96
5	Black	Loss	Kamiya Shunsuke	2792.80
6	White	Loss	Tachi Masaya	2534.32
20 New Year (Mikami) Cup
Date	2017-01-22		Rating	2615.19
Round	Color	Result	Opponent
S2	Black	Win	Sato Kiyotomi	2495.47
S3	Black	Loss	Nakamura Shigeru	2968.17
S4	Black	Win	Ishitani Shin-ichi	2397.59
S5	Black	Loss	Okabe Hiroshi	2723.16
17 Kanto Renju Emperor Tournament 1st round
Date	2016-11-23		Rating	2618.78
Round	Color	Result	Opponent
1	Black	Win	Demachi Koichiro	1935.91
2	Black	Loss	Okabe Hiroshi	2717.51
3	Black	Win	Iwano Fumio	2273.47
4	White	Win	Ishitani Shin-ichi	2404.06
54 Meijinsen Tournament
Date	2016-09-19		Rating	2622.63
Round	Color	Result	Opponent
1	White	Win	Matsuura Hiroshi	2364.79
2	Black	Loss	Kamiya Shunsuke	2764.14
3	White	Draw	Hasegawa Kazuto	2643.35
4	White	Draw	Iio Yoshihiro	2564.97
5	Black	Win	Tanaka Toshiki	2448.31
6	Black	Draw	Nakayama Tomoharu	2781.51
7	Black	Draw	Maruyama Yasushi	2294.86
8	Black	Win	Kuga Akio	2371.78
9	White	Loss	Okabe Hiroshi	2721.94
33 Kanto Championship
Date	2016-07-31		Rating	2626.88
Round	Color	Result	Opponent
1	White	Win	Kato Yasuhiro	2047.00
2	Black	Loss	Nakamura Shigeru	2958.99
3	Black	Loss	Okabe Hiroshi	2726.05
4	Black	Win	Nakamura Souta	2278.68
5	Black	Draw	Nakayama Tomoharu	2780.33
6	Black	Draw	Ishitani Shin-ichi	2390.88
54 Meijinsen Qualification East Japan area 2nd round
Date	2016-06-12		Rating	2633.36
Round	Color	Result	Opponent
1	White	Win	Kusajima Masato	2270.36
2	Black	Win	Kamiya Shunsuke	2731.25
3	White	Win	Tamada Yoichi	2572.73
4	Black	Draw	Mitsumori Masao	2357.51
5	White	Draw	Okabe Hiroshi	2728.26
19 Mikami Cup
Date	2016-03-13		Rating	2635.65
Round	Color	Result	Opponent
S1	White	Win	Ishitani Shin-ichi	2395.40
S2	Black	Loss	Nakamura Shigeru	2944.72
S3	White	Win	Kusajima Masato	2267.28
S4	Black	Loss	Okabe Hiroshi	2723.93
16th Kanto Renju Emperor Tournament Final
Date	2016-02-14		Rating	2637.01
Round	Color	Result	Opponent
1	Black	Loss	Nakayama Tomoharu	2783.39
2	White	Loss	Nakayama Tomoharu	2783.39
11th All Japan Championship
Date	2016-01-11		Rating	2640.94
Round	Color	Result	Opponent
1	White	Win	Maruta Hiroki	2126.04
2	Black	Win	Nakamura Souta	2306.15
3	Black	Win	Okabe Hiroshi	2718.75
4	Black	Loss	Nakayama Tomoharu	2781.73
5	White	Loss	Sato Kiyotomi	2541.15
6	White	Draw	Tamada Yoichi	2576.31
16 Kanto Renju Emperor Tournament 2nd round
Date	2015-12-13		Rating	2645.11
Round	Color	Result	Opponent
1	White	Win	Sato Kiyotomi	2540.70
2	White	Win	Ono Takayuki	2328.82
3	Black	Loss	Okabe Hiroshi	2718.37
4	Black	Draw	Nakayama Tomoharu	2779.85
5	White	Win	Nakamura Shigeru	2927.64
16 Kanto Renju Emperor Tournament 1st round
Date	2015-11-15		Rating	2645.65
Round	Color	Result	Opponent
1	Black	Win	Ishitani Shin-ichi	2397.38
2	Black	Win	Sato Kiyotomi	2537.74
3	Black	Win	Okabe Hiroshi	2719.21
4	Black	Win	Ono Takayuki	2329.62
53 Meijinsen Tournament
Date	2015-09-22		Rating	2638.99
Round	Color	Result	Opponent
1	Black	Loss	Hasegawa Kazuto	2676.28
2	Black	Win	Oosumi Yuuki	2776.72
3	White	Win	Ishitani Shin-ichi	2395.39
4	Black	Draw	Nakayama Tomoharu	2772.72
5	White	Loss	Kawamura Norihiko	2626.84
6	White	Loss	Tamada Yoichi	2586.49
7	Black	Draw	Iio Yoshihiro	2535.21
8	White	Win	Matsuura Hiroshi	2402.19
9	Black	Draw	Okabe Hiroshi	2721.39
World Championship 2015, BT
Date	2015-08-12		Rating	2635.27
Round	Color	Result	Opponent
1	White	Win	Huang Xiuyi	2192.33
2	Black	Loss	Miyagawa Junzo	2249.89
3	Black	Win	Topkin Georg-Romet	2339.37
4	Black	Win	Wang Chih-Kung	2342.54
5	Black	Loss	Sirategyan Karen	2443.69
6	Black	Win	Ishitani Shin-ichi	2397.83
7	Black	Win	Lavrik-Karmazin Maksim	2294.11
8	White	Win	Mano Yoshihisa	2367.36
9	White	Draw	Nakayama Tomoharu	2768.79
World Championship 2015, QT
Date	2015-08-05		Rating	2635.09
Round	Color	Result	Opponent
1	Black	Win	Topkin Georg-Romet	2337.91
2	Black	Win	Nakayama Tomoharu	2767.36
3	Black	Loss	Kamiya Shunsuke	2709.10
4	White	Draw	Wang Qingqing	2630.44
5	Black	Win	Huang Yen-Hua	2480.12
6	Black	Loss	Epifanov Dmitry	2711.31
7	Black	Win	Lin Liu-Min	2572.47
Kanto Championship
Date	2015-07-20		Rating	2633.36
Round	Color	Result	Opponent
1	White	Win	Maruta Hiroki	2107.93
2	Black	Win	Nakamura Shigeru	2909.28
3	Black	Draw	Okabe Hiroshi	2730.21
4	White	Win	Iwano Fumio	2254.73
5	Black	Loss	Nakayama Tomoharu	2766.55
6	Black	Win	Zhao Jiadong	2141.22
53 Meijinsen Qualification East Japan area 2nd round
Date	2015-06-14		Rating	2626.05
Round	Color	Result	Opponent
1	White	Loss	Tamada Yoichi	2594.20
2	Black	Win	Sato Kiyotomi	2509.88
3	White	Win	Ono Takayuki	2327.81
5	Black	Draw	Kamiya Shunsuke	2695.82
6	White	Win	Nakamura Souta	2297.55
53 Meijinsen Qualification East Japan area 1st round
Date	2015-05-10		Rating	2618.26
Round	Color	Result	Opponent
1	Black	Win	Mitsumori Masao	2329.31
2	Black	Win	Iwano Fumio	2249.06
3	Black	Win	Nakamura Souta	2295.74
4	White	Loss	Kamiya Shunsuke	2689.95
10th All Japan Championship
Date	2015-03-29		Rating	2608.90
Round	Color	Result	Opponent
1	White	Win	Fujikawa Masaki	2097.04
2	White	Loss	Kamiya Shunsuke	2678.95
3	Black	Win	Kato Yasuhiro	2065.85
4	Black	Win	Mitsumori Masao	2327.75
5	Black	Loss	Ishitani Shin-ichi	2427.60
6	Black	Win	Tanizaki Ryusuke	2205.65
12 Kanto Renju Emperor Tournament 1st round
Date	2011-10-23		Rating	2440.15
Round	Color	Result	Opponent
1	Black	Loss	Oosumi Yuuki	2773.50
2	White	Win	Suzuki Rin	1992.68
3	White	Loss	Isobe Taizan	2423.51
4	White	Loss	Fukui Nobuhiro	2474.86
49 Meijinsen Qualification East-Japan area 1st round
Date	2011-06-12		Rating	2437.48
Round	Color	Result	Opponent
1	Black	Loss	Isobe Taizan	2410.46
2	Black	Win	Kudomi Takahiro	2415.14
3	Black	Loss	Nakayama Tomoharu	2555.97
4	Black	Win	Ono Takayuki	2398.03
ex	Black	Loss	Nakayama Tomoharu	2555.97
28th Kanto Shineisen Tournament
Date	2011-04-17		Rating	2438.21
Round	Color	Result	Opponent
1	White	Win	Kon Akira	2008.93
2	Black	Win	Kamiya Shunsuke	2413.85
3	White	Win	Ozawa Tetsushi	2093.92
4	White	Loss	Nakayama Tomoharu	2544.44
5	Black	Win	Tomobe Katsuhiro	2231.19
5	White	Loss	Kamiya Shunsuke	2413.85
14th Mikami Cup Tournament
Date	2011-01-30		Rating	2439.13
Round	Color	Result	Opponent
A1	Black	Win	Kon Akira	2001.46
A2	White	Loss	Iwano Fumio	2133.25
A3	Black	Win	Matsuoka Teruo	1990.72
A4	Black	Win	Kise Katsumi	2522.84
A5	Black	Win	Isobe Seiji	2025.27
8th Middle-dan Players Tournament
Date	2009-08-30		Rating	2445.67
Round	Color	Result	Opponent
1	White	Win	Yamamoto Yasuhiro	2149.93
2	White	Win	Gakumazawa Hideaki	2140.06
3	Black	Loss	Sato Kiyotomi	2435.35
4	White	Win	Miyagawa Junzo	2202.67
5	White	Draw	Maruyama Yasushi	2264.16
6	Black	Win	Ono Takayuki	2404.05
46th Meijinsen Qualification East-Japan area 2nd round
Date	2008-07-13		Rating	2442.41
Round	Color	Result	Opponent
	White	Loss	Kawamura Norihiko	2657.39
	White	Loss	Sato Kiyotomi	2435.24
	White	Win	Arita Nobuyoshi	2393.45
	White	Loss	Isobe Taizan	2415.51
	Black	Win	Nagao Noriaki	2261.77
46th Meijinsen Qualification East-Japan area 1st round
Date	2008-06-15		Rating	2444.00
Round	Color	Result	Opponent
1	Black	Win	Sato Kiyotomi	2429.79
2	White	Win	Tanno Yoshitaka	2122.61
3	Black	Win	Ono Takayuki	2400.12
4	Black	Win	Kudomi Takahiro	2338.86
25th Kanto Shineisen Tournament
Date	2008-04-13		Rating	2437.74
Round	Color	Result	Opponent
1	White	Win	Fujikawa Masaki	2104.55
2	Black	Win	Watanabe Tatsuya	2156.98
3	White	Win	Tomobe Katsuhiro	2065.01
4	Black	Win	Iwano Fumio	2189.84
5	Black	Draw	Ono Takayuki	2396.43
2nd All Japan Championship (WC Qualification)
Date	2007-03-25		Rating	2376.69
Round	Color	Result	Opponent
1	White	Win	Kuramoto Hideharu	1888.98
2	Black	Loss	Yamaguchi Yusui	2649.84
3	Black	Loss	Iio Yoshihiro	2522.67
4	White	Win	Maruta Hiroki	2024.93
5	White	Win	Tanno Yoshitaka	2129.94
6	Black	Win	Ono Takayuki	2343.56
10th Mikami Cup Tournament, A-class
Date	2007-01-28		Rating	2365.65
Round	Color	Result	Opponent
1	Black	Win	Matsuoka Teruo	1875.45
2	White	Loss	Iwano Fumio	2143.71
3	Black	Win	Maruta Hiroki	2021.70
4	White	Win	Tomobe Katsuhiro	2056.03
5	Black	Win	Kobayashi Koichi	2099.33
23rd Kanto Shinei Tournament
Date	2006-09-10		Rating	2342.46
Round	Color	Result	Opponent
1	White	Win	Maruta Hiroki	2003.57
1	Black	Win	Teshima Masakatsu	1952.64
2	Black	Loss	Tanizaki Ryusuke	2127.37
3	Black	Win	Matsuoka Teruo	1854.30
4	White	Win	Iwano Fumio	2110.73
5	White	Loss	Watanabe Tatsuya	2135.71
Meijin-sen Qual, East Japan area 1st round
Date	2006-06-18		Rating	2338.40
Round	Color	Result	Opponent
1	Black	Win	Maruta Koji	2113.04
2	White	Win	Mitsumori Masao	2253.50
3	Black	Win	Kudomi Takahiro	2278.29
4	Black	Loss	Kamemoto Daichi	2207.01
23rd Kanto Championship
Date	2006-05-21		Rating	2336.02
Round	Color	Result	Opponent
1	White	Loss	Kawamura Norihiko	2664.50
2	White	Win	Tanizaki Ryusuke	2114.16
3	Black	Win	Kudomi Takahiro	2276.17
4	White	Win	Isobe Taizan	2411.34
5	White	Loss	Nakamura Shigeru	2847.42
46th Suisei-sen tournament final round
Date	2006-04-16		Rating	2328.93
Round	Color	Result	Opponent
	White	Win	Itami Yoshiyuki	2157.65
	White	Win	Nagao Noriaki	2221.57
	White	Loss	Kato Yasuhiro	2051.78
	White	Win	Hara Masao	2077.99
	Black	Loss	Ono Takayuki	2304.73
1st All Japan Championship
Date	2006-03-26		Rating	2325.97
Round	Color	Result	Opponent
1	Black	Win	Tadokoro Hosai	1930.91
2	Black	Loss	Isobe Taizan	2425.60
3	Black	Loss	Tanizaki Ryusuke	2113.08
4	White	Win	Itami Yoshiyuki	2160.55
5	Black	Win	Sato Kiyotomi	2410.84
6	White	Win	Miyoshi Takeo	2276.20
46th Suisei-sen Tournament - 1st round
Date	2006-03-12		Rating	2323.56
Round	Color	Result	Opponent
1	Black	Win	Fujikawa Masaki	2029.78
2	White	Win	Tadokoro Hosai	1930.37
3	White	Loss	Nagao Noriaki	2223.52
4	White	Win	Tomobe Katsuhiro	2090.99
9th Mikami Cup - A Class
Date	2006-01-29		Rating	2317.15
Round	Color	Result	Opponent
1	Black	Win	Iwano Fumio	2074.04
2	White	Win	Teshima Masakatsu	1957.64
3	White	Loss	Ono Takayuki	2303.81
4	White	Win	Nakata Shinsuke	1976.35
5	Black	Win	Watanabe Tatsuya	2134.04
37th Kyoto Classified - group 1
Date	2005-11-13		Rating	2303.93
Round	Color	Result	Opponent
1	Black	Win	Ozawa Tetsushi	2015.63
2	White	Win	Itami Yoshiyuki	2179.45
3	White	Loss	Oosumi Yuuki	2404.87
4	White	Win	Hayashi Koji	2005.55
5	Black	Win	Ono Takayuki	2296.07
6	White	Loss	Shinoda Kiyoshi	2348.78
6th Kanto Renju Emperor Tournament - Semifinal
Date	2005-10-23		Rating	2299.54
Round	Color	Result	Opponent
	White	Loss	Yamaguchi Yusui	2596.11
	White	Loss	Okabe Hiroshi	2592.02
	White	Loss	Isobe Taizan	2458.06
	White	Loss	Kamemoto Daichi	2180.81
	White	Win	Sato Kiyotomi	2394.82
6th Kanto Renju Emperor Tournament - 1st round
Date	2005-10-22		Rating	2299.40
Round	Color	Result	Opponent
1	White	Win	Koyama Masayuki	1729.66
2	White	Loss	Sato Kiyotomi	2394.86
3	White	Win	Teshima Masakatsu	1958.03
4	Black	Win	Nakata Shinsuke	1968.16
22nd Kanto Shineisen Tournament
Date	2005-09-11		Rating	2294.05
Round	Color	Result	Opponent
1	Black	Win	Teshima Masakatsu	1958.04
2	White	Win	Tadokoro Hosai	1927.10
3	Black	Win	Tomobe Katsuhiro	2075.17
4	Black	Loss	Arita Nobuyoshi	2343.00
5	Black	Win	Kamemoto Daichi	2169.93
43rd Meijinsen Qualification: East Japan 1st round
Date	2005-06-12		Rating	2278.59
Round	Color	Result	Opponent
1	Black	Win	Maruta Koji	2152.30
2	Black	Loss	Kudomi Takahiro	2286.60
3	White	Loss	Arita Nobuyoshi	2325.04
4	White	Win	Ohno Syunzo	2074.54
22nd Kanto Championship
Date	2005-05-22		Rating	2275.87
Round	Color	Result	Opponent
1	White	Win	Mitsumori Masao	2266.72
2	White	Loss	Yamaguchi Yusui	2562.68
3	White	Win	Kudomi Takahiro	2287.95
4	Black	Loss	Maruta Koji	2156.95
5	White	Loss	Sato Kiyotomi	2394.26
45th Suisei-sen Tournament
Date	2005-03-20		Rating	2268.79
Round	Color	Result	Opponent
1	White	Win	Muramatsu Yasuhiro	1691.60
2	White	Win	Arita Nobuyoshi	2298.78
3	White	Win	Sano Hiroyuki	2135.98
4	Black	Win	Kobayashi Koichi	2093.90
8th Mikami Cup - A Class
Date	2005-01-23		Rating	2255.26
Round	Color	Result	Opponent
1	Black	Draw	Arita Nobuyoshi	2286.38
2	Black	Win	Nagumo Natsuhiko	2055.90
3	Black	Win	Kato Yasuhiro	2024.30
4	White	Loss	Nagao Noriaki	2244.16
5	Black	Win	Sato Kiyotomi	2370.40
5th Kanto Renju Emperor Tournament - 1st round
Date	2004-11-28		Rating	2237.76
Round	Color	Result	Opponent
1	White	Loss	Mitsumori Masao	2248.41
2	Black	Loss	Tomobe Katsuhiro	2030.94
3	Black	Win	Mao Richu	1771.83
4	Black	Loss	Iwano Fumio	2040.60
21st Kanto Shineisen Tournament
Date	2004-09-12		Rating	2230.33
Round	Color	Result	Opponent
1	White	Win	Shibata Satoru	1710.48
2	Black	Loss	Sato Kiyotomi	2365.86
3	Black	Win	Sato Takuma	2169.49
4	White	Draw	Tashiro Yuichi	2288.64
5	Black	Win	Hara Masao	2070.80
7th Mikami Cup - A class
Date	2004-01-25		Rating	2194.81
Round	Color	Result	Opponent
4	Black	Win	Kawabe Tatsuya	1879.69
5	Black	Win	Itami Yoshiyuki	2149.22
20th Kanto Shineisen Tournament
Date	2003-09-21		Rating	2167.39
Round	Color	Result	Opponent
1	White	Loss	Kato Yasuhiro	2047.13
2	White	Win	Maruta Hiroki	1935.10
3	White	Loss	Sato Takuma	2137.59
4	White	Win	Sasaki Miyu	1937.96
5	White	Loss	Itami Yoshiyuki	2152.29