Koyama Jun (小山純)

Place: Tokyo, Japan

Rating: 2516.00, Rank: 61

First game: 2007-03-25, Last game: 2022-05-22

Top rating: 2565.21 (2015-11-15)

Games: 246, Wins: 136, Draws: 33, Losses: 77

Gy1: 4, Gy2: 4, Gy5: 103

60th Meijinsen Qualification Kanto area 1st round
Date 2022-05-22 Rating 2516.00
Round Color Result Opponent
1 White Win Tomobe Katsuhiro 2094.16
2 White Win Maruta Hiroki 2190.48
3 Black Draw Fujita Maiko 2323.86
4 Black Draw Yokoyama Shota 2371.60
57 Meijinsen Tournament
Date 2019-09-16 Rating 2533.02
Round Color Result Opponent
1 Black Draw Inoue Fumiya 2351.54
2 White Loss Kamiya Shunsuke 2743.96
3 Black Loss Kawamura Norihiko 2610.80
4 White Win Matsuura Hiroshi 2312.81
5 Black Loss Nakayama Tomoharu 2754.58
6 White Loss Kawano Takahisa 2388.51
7 White Loss Hasegawa Kazuto 2527.22
8 White Win Okabe Hiroshi 2647.50
9 Black Win Ishitani Shin-ichi 2320.52
World Championship AT
Date 2019-08-10 Rating 2536.90
Round Color Result Opponent
1 Black Draw Mei Fan 2613.28
2 Black Win Oll Aivo 2680.22
3 Black Win Inoue Fumiya 2354.12
4 Black Win Epifanov Dmitry 2597.63
5 Black Loss Nakayama Tomoharu 2750.02
6 Black Win Okabe Hiroshi 2644.34
7 Black Draw Kamiya Shunsuke 2741.67
8 Black Draw Gardstrom Petter 2621.67
9 White Loss Fedotov Denis 2592.72
10 White Loss Cao Dong 2692.64
11 Black Loss Sushkov Vladimir 2768.46
World Championship QT
Date 2019-08-02 Rating 2536.82
Round Color Result Opponent
1 White Win Sandstrom Richard 2314.44
2 White Win Li Xiaoqing 2582.31
3 Black Loss Mesila Villem 2588.50
4 Black Win Wai Chan Keong 2700.04
5 Black Draw Fedotov Denis 2594.76
6 White Loss Gardstrom Petter 2622.70
7 White Win Topkin Georg-Romet 2540.48
57 Meijinsen Qualification East Japan area 2nd round
Date 2019-06-23 Rating 2532.63
Round Color Result Opponent
1 Black Win Maruta Hiroki 2126.83
2 Black Win Maruta Koji 2072.30
3 White Win Inoue Fumiya 2356.45
4 Black Win Kusajima Masato 2200.95
5 White Win Ono Takayuki 2329.90
14th All Japan Championship
Date 2019-03-31 Rating 2518.93
Round Color Result Opponent
1 White Loss Fujita Maiko 2230.36
2 Black Win Chigira Makoto 2026.02
3 White Draw Inoue Fumiya 2356.60
4 White Win Ono Takayuki 2329.18
5 Black Loss Nakamura Shigeru 2915.87
6 Black Loss Okabe Hiroshi 2630.34
19 Renju Emperor Tournament Kanto area 1st round
Date 2018-10-21 Rating 2506.88
Round Color Result Opponent
1 Black Win Demachi Koichiro 1875.16
2 White Loss Iwano Fumio 2179.49
3 White Draw Ishitani Shin-ichi 2355.42
4 White Loss Inoue Fumiya 2340.86
56 Meijinsen Tournament
Date 2018-09-17 Rating 2508.81
Round Color Result Opponent
1 Black Win Kuga Akio 2349.41
2 Black Loss Matsuura Hiroshi 2301.83
3 White Win Okabe Hiroshi 2632.07
5 Black Win Kawamura Norihiko 2590.10
6 Black Loss Ishitani Shin-ichi 2357.43
7 Black Loss Kamiya Shunsuke 2723.85
8 White Loss Nakamura Shigeru 2917.33
9 White Win Hasegawa Kazuto 2511.46
35 Kanto Championship
Date 2018-07-16 Rating 2511.02
Round Color Result Opponent
4 Black Loss Sato Kiyotomi 2380.94
5 White Win Iwano Fumio 2183.30
6 White Win Fujikawa Masaki 2052.40
56 Meijinsen Qualification East Japan area 2nd round
Date 2018-06-25 Rating 2512.50
Round Color Result Opponent
1 White Win Kusajima Masato 2237.14
2 Black Win Sato Kiyotomi 2381.39
3 White Loss Ono Takayuki 2323.79
56 Meijinsen Qualification Kanto area 1st round
Date 2018-05-13 Rating 2516.37
Round Color Result Opponent
1 Black Loss Mitsumori Masao 2268.12
2 Black Win Iwano Fumio 2191.34
3 Black Win Maruta Hiroki 2097.77
4 White Win Sato Kiyotomi 2381.02
12th Team World Championship
Date 2018-05-05 Rating 2517.25
Round Color Result Opponent
1 Black Win Lillemaa Argo 2131.58
2 Black Win Purk Andry 2562.43
4 White Win Kachaev Denis 2472.29
5 Black Win Nikonov Konstantin 2619.11
6 Black Win Liu Yang 2552.92
7 White Win Lavrik-Karmazin Maksim 2417.65
8 White Draw Artemyev Sergey 2495.97
9 Black Loss Liu Yang 2552.92
10 White Loss Purk Andry 2562.43
13th All Japan Championship
Date 2018-01-28 Rating 2515.45
Round Color Result Opponent
1 White Loss Ono Takayuki 2318.03
2 White Loss Ishitani Shin-ichi 2349.43
3 White Loss Miyamoto Syunju 2204.07
5 White Win Sato Kiyotomi 2375.60
6 Black Win Maruta Hiroki 2090.85
18 Kanto Renju Emperor Tournament 2nd round
Date 2017-12-17 Rating 2520.75
Round Color Result Opponent
1 Black Draw Sato Kiyotomi 2377.99
2 Black Win Miyamoto Syunju 2207.33
3 Black Loss Nakamura Shigeru 2886.67
4 Black Loss Okabe Hiroshi 2646.99
5 White Win Kusajima Masato 2234.36
18 Kanto Renju Emperor Tournament 1st round
Date 2017-11-01 Rating 2527.66
Round Color Result Opponent
1 Black Win Koyama Akihiro 1915.25
2 White Draw Okabe Hiroshi 2648.48
3 Black Win Ono Takayuki 2313.90
4 White Win Kusajima Masato 2231.60
World Championship BT
Date 2017-08-12 Rating 2536.37
Round Color Result Opponent
1 Black Win Rahumagi Brenet 2264.63
2 Black Win Sun In 2373.09
3 Black Draw Liu Yang 2584.70
4 Black Win Lan Zhiren 2566.92
5 Black Win Yang Yu-Hsiung 2375.71
6 Black Loss Tang Kai Lam 2694.81
7 Black Win Topkin Georg-Romet 2439.43
8 White Win Huang Yen-Hua 2389.89
9 Black Loss Okabe Hiroshi 2648.77
World Championship QT
Date 2017-08-05 Rating 2536.41
Round Color Result Opponent
1 White Win Rahumagi Brenet 2264.54
2 White Win Sushkov Vladimir 2805.28
3 Black Loss Lan Zhiren 2566.34
4 Black Loss Mei Fan 2616.72
5 White Draw Okabe Hiroshi 2648.87
6 Black Win Kim Su Chan 2255.53
7 Black Win Lu Wei-Yuan 2535.37
55 Meijinsen Qualification East Japan area 2nd round
Date 2017-06-11 Rating 2532.69
Round Color Result Opponent
1 Black Win Tomobe Katsuhiro 2102.36
2 White Loss Tamada Yoichi 2470.91
3 White Loss Ono Takayuki 2311.04
4 Black Win Miyamoto Syunju 2201.22
5 Black Loss Sato Kiyotomi 2404.39
12th All Japan Championship
Date 2017-03-26 Rating 2538.00
Round Color Result Opponent
1 Black Win Kusajima Masato 2222.89
2 Black Loss Nakamura Shigeru 2887.85
3 Black Win Ishitani Shin-ichi 2332.18
4 Black Win Nakayama Tomoharu 2724.70
5 Black Loss Kamiya Shunsuke 2708.48
6 White Loss Tachi Masaya 2470.63
20 New Year (Mikami) Cup
Date 2017-01-22 Rating 2541.72
Round Color Result Opponent
S2 Black Win Sato Kiyotomi 2421.11
S3 Black Loss Nakamura Shigeru 2885.91
S4 Black Win Ishitani Shin-ichi 2332.07
S5 Black Loss Okabe Hiroshi 2648.79
17 Kanto Renju Emperor Tournament 1st round
Date 2016-11-23 Rating 2544.86
Round Color Result Opponent
1 Black Win Demachi Koichiro 1882.64
2 Black Loss Okabe Hiroshi 2645.24
3 Black Win Iwano Fumio 2205.96
4 White Win Ishitani Shin-ichi 2336.62
54 Meijinsen Tournament
Date 2016-09-19 Rating 2548.18
Round Color Result Opponent
1 White Win Matsuura Hiroshi 2307.59
2 Black Loss Kamiya Shunsuke 2683.36
3 White Draw Hasegawa Kazuto 2566.69
4 White Draw Iio Yoshihiro 2487.45
5 Black Win Tanaka Toshiki 2386.71
6 Black Draw Nakayama Tomoharu 2709.09
7 Black Draw Maruyama Yasushi 2231.79
8 Black Win Kuga Akio 2303.77
9 White Loss Okabe Hiroshi 2648.54
33 Kanto Championship
Date 2016-07-31 Rating 2551.46
Round Color Result Opponent
1 White Win Kato Yasuhiro 1993.27
2 Black Loss Nakamura Shigeru 2877.09
3 Black Loss Okabe Hiroshi 2651.54
4 Black Win Nakamura Souta 2213.44
5 Black Draw Nakayama Tomoharu 2707.13
6 Black Draw Ishitani Shin-ichi 2328.15
54 Meijinsen Qualification East Japan area 2nd round
Date 2016-06-12 Rating 2556.15
Round Color Result Opponent
1 White Win Kusajima Masato 2207.63
2 Black Win Kamiya Shunsuke 2657.68
3 White Win Tamada Yoichi 2496.25
4 Black Draw Mitsumori Masao 2285.10
5 White Draw Okabe Hiroshi 2653.27
19 Mikami Cup
Date 2016-03-13 Rating 2558.19
Round Color Result Opponent
S1 White Win Ishitani Shin-ichi 2331.64
S2 Black Loss Nakamura Shigeru 2865.08
S3 White Win Kusajima Masato 2205.20
S4 Black Loss Okabe Hiroshi 2650.82
16th Kanto Renju Emperor Tournament Final
Date 2016-02-14 Rating 2559.21
Round Color Result Opponent
1 Black Loss Nakayama Tomoharu 2705.32
2 White Loss Nakayama Tomoharu 2705.32
11th All Japan Championship
Date 2016-01-11 Rating 2561.97
Round Color Result Opponent
1 White Win Maruta Hiroki 2066.64
2 Black Win Nakamura Souta 2230.86
3 Black Win Okabe Hiroshi 2647.68
4 Black Loss Nakayama Tomoharu 2703.44
5 White Loss Sato Kiyotomi 2456.01
6 White Draw Tamada Yoichi 2500.46
16 Kanto Renju Emperor Tournament 2nd round
Date 2015-12-13 Rating 2564.83
Round Color Result Opponent
1 White Win Sato Kiyotomi 2455.76
2 White Win Ono Takayuki 2272.29
3 Black Loss Okabe Hiroshi 2647.62
4 Black Draw Nakayama Tomoharu 2701.49
5 White Win Nakamura Shigeru 2851.90
16 Kanto Renju Emperor Tournament 1st round
Date 2015-11-15 Rating 2565.21
Round Color Result Opponent
1 Black Win Ishitani Shin-ichi 2333.94
2 Black Win Sato Kiyotomi 2453.71
3 Black Win Okabe Hiroshi 2648.44
4 Black Win Ono Takayuki 2272.78
53 Meijinsen Tournament
Date 2015-09-22 Rating 2560.62
Round Color Result Opponent
1 Black Loss Hasegawa Kazuto 2592.91
2 Black Win Oosumi Yuuki 2707.62
3 White Win Ishitani Shin-ichi 2333.28
4 Black Draw Nakayama Tomoharu 2694.68
5 White Loss Kawamura Norihiko 2558.08
6 White Loss Tamada Yoichi 2508.14
7 Black Draw Iio Yoshihiro 2465.85
8 White Win Matsuura Hiroshi 2338.43
9 Black Draw Okabe Hiroshi 2650.52
World Championship BT
Date 2015-08-12 Rating 2557.82
Round Color Result Opponent
1 White Win Huang Xiuyi 2129.73
2 Black Loss Miyagawa Junzo 2181.50
3 Black Win Topkin Georg-Romet 2270.23
4 Black Win Wang Chih-Kung 2280.95
5 Black Loss Sirategyan Karen 2366.27
6 Black Win Ishitani Shin-ichi 2335.71
7 Black Win Lavrik-Karmazin Maksim 2220.92
8 White Win Mano Yoshihisa 2296.51
9 White Draw Nakayama Tomoharu 2690.86
World Championship QT
Date 2015-08-05 Rating 2557.62
Round Color Result Opponent
1 Black Win Topkin Georg-Romet 2268.89
2 Black Win Nakayama Tomoharu 2689.70
3 Black Loss Kamiya Shunsuke 2630.64
4 White Draw Wang Qingqing 2567.68
5 Black Win Huang Yen-Hua 2399.98
6 Black Loss Epifanov Dmitry 2633.76
7 Black Win Lin Liu-Min 2500.85
Kanto Championship
Date 2015-07-20 Rating 2556.24
Round Color Result Opponent
1 White Win Maruta Hiroki 2053.15
2 Black Win Nakamura Shigeru 2836.84
3 Black Draw Okabe Hiroshi 2657.34
4 White Win Iwano Fumio 2192.00
5 Black Loss Nakayama Tomoharu 2688.62
6 Black Win Zhao Jiadong 2075.80
53 Meijinsen Qualification East Japan area 2nd round
Date 2015-06-14 Rating 2550.79
Round Color Result Opponent
1 White Loss Tamada Yoichi 2513.43
2 Black Win Sato Kiyotomi 2434.18
3 White Win Ono Takayuki 2271.80
5 Black Draw Kamiya Shunsuke 2619.25
6 White Win Nakamura Souta 2221.56
53 Meijinsen Qualification East Japan area 1st round
Date 2015-05-10 Rating 2545.02
Round Color Result Opponent
1 Black Win Mitsumori Masao 2267.50
2 Black Win Iwano Fumio 2187.96
3 Black Win Nakamura Souta 2219.55
4 White Loss Kamiya Shunsuke 2613.61
10th All Japan Championship
Date 2015-03-29 Rating 2538.07
Round Color Result Opponent
1 White Win Fujikawa Masaki 2039.38
2 White Loss Kamiya Shunsuke 2604.11
3 Black Win Kato Yasuhiro 2011.95
4 Black Win Mitsumori Masao 2266.62
5 Black Loss Ishitani Shin-ichi 2358.89
6 Black Win Tanizaki Ryusuke 2137.75
12 Kanto Renju Emperor Tournament 1st round
Date 2011-10-23 Rating 2403.13
Round Color Result Opponent
1 Black Loss Oosumi Yuuki 2698.38
2 White Win Suzuki Rin 1947.19
3 White Loss Isobe Taizan 2357.90
4 White Loss Fukui Nobuhiro 2403.68
49 Meijinsen Qualification East-Japan area 1st round
Date 2011-06-12 Rating 2400.18
Round Color Result Opponent
1 Black Loss Isobe Taizan 2349.00
2 Black Win Kudomi Takahiro 2338.56
3 Black Loss Nakayama Tomoharu 2493.16
4 Black Win Ono Takayuki 2339.31
ex Black Loss Nakayama Tomoharu 2493.16
28th Kanto Shineisen Tournament
Date 2011-04-17 Rating 2400.96
Round Color Result Opponent
1 White Win Kon Akira 1955.83
2 Black Win Kamiya Shunsuke 2381.81
3 White Win Ozawa Tetsushi 2034.52
4 White Loss Nakayama Tomoharu 2483.91
5 Black Win Tomobe Katsuhiro 2169.57
5 White Loss Kamiya Shunsuke 2381.81
14th Mikami Cup Tournament
Date 2011-01-30 Rating 2402.32
Round Color Result Opponent
A1 Black Win Kon Akira 1951.20
A2 White Loss Iwano Fumio 2086.69
A3 Black Win Matsuoka Teruo 1962.91
A4 Black Win Kise Katsumi 2464.22
A5 Black Win Isobe Seiji 1964.10
8th Middle-dan Players Tournament
Date 2009-08-30 Rating 2413.56
Round Color Result Opponent
1 White Win Yamamoto Yasuhiro 2110.78
2 White Win Gakumazawa Hideaki 2016.20
3 Black Loss Sato Kiyotomi 2337.06
4 White Win Miyagawa Junzo 2144.22
5 White Draw Maruyama Yasushi 2209.69
6 Black Win Ono Takayuki 2319.51
46th Meijinsen Qualification East-Japan area 1st round
Date 2008-06-15 Rating 2426.01
Round Color Result Opponent
3 Black Win Ono Takayuki 2318.55
4 Black Win Kudomi Takahiro 2304.70
25th Kanto Shineisen Tournament
Date 2008-04-13 Rating 2424.60
Round Color Result Opponent
1 White Win Fujikawa Masaki 2048.90
2 Black Win Watanabe Tatsuya 2057.13
3 White Win Tomobe Katsuhiro 2067.80
4 Black Win Iwano Fumio 2191.77
5 Black Draw Ono Takayuki 2319.08
2nd All Japan Championship (WC Qualification)
Date 2007-03-25 Rating 2404.98
Round Color Result Opponent
1 White Win Kuramoto Hideharu 1922.36
2 Black Loss Yamaguchi Yusui 2534.76
5 White Win Tanno Yoshitaka 2056.43
6 Black Win Ono Takayuki 2301.01