JPN Koyama Jun

Place: Tokyo, Japan

Rating: 2510.17, Rank: 50

First game: 2007-03-25, Last game: 2019-09-16

Top rating: 2543.76 (2015-11-15)

Games: 242, Wins: 134, Draws: 31, Losses: 77

Gy1: 20, Gy2: 50, Gy5: 184

57 Meijinsen Tournament
Date 2019-09-16 Rating 2510.17
Round Color Result Opponent
1 Black Draw JPN Inoue Fumiya 2303.44
2 White Loss JPN Kamiya Shunsuke 2716.91
3 Black Loss JPN Kawamura Norihiko 2583.74
4 White Win JPN Matsuura Hiroshi 2260.12
5 Black Loss JPN Nakayama Tomoharu 2726.99
6 White Loss JPN Kawano Takahisa 2353.83
7 White Loss JPN Hasegawa Kazuto 2520.40
8 White Win JPN Okabe Hiroshi 2624.54
9 Black Win JPN Ishitani Shin-ichi 2312.01
World Championship AT
Date 2019-08-10 Rating 2513.53
Round Color Result Opponent
1 Black Draw CHN Mei Fan 2592.09
2 Black Win EST Oll Aivo 2638.62
3 Black Win JPN Inoue Fumiya 2308.36
4 Black Win RUS Epifanov Dmitry 2547.31
5 Black Loss JPN Nakayama Tomoharu 2722.38
6 Black Win JPN Okabe Hiroshi 2620.97
7 Black Draw JPN Kamiya Shunsuke 2714.69
8 Black Draw SWE Gardstrom Petter 2611.37
9 White Loss RUS Fedotov Denis 2571.55
10 White Loss CHN Cao Dong 2675.78
11 Black Loss RUS Sushkov Vladimir 2726.39
World Championship QT
Date 2019-08-02 Rating 2513.39
Round Color Result Opponent
1 White Win SWE Sandstrom Richard 2269.97
2 White Win CHN Li Xiaoqing 2554.86
3 Black Loss EST Mesila Villem 2549.91
4 Black Win MAC Wai Chan Keong 2655.14
5 Black Draw RUS Fedotov Denis 2572.70
6 White Loss SWE Gardstrom Petter 2611.99
7 White Win EST Topkin Georg-Romet 2499.69
57 Meijinsen Qualification East Japan area 2nd round
Date 2019-06-23 Rating 2509.11
Round Color Result Opponent
1 Black Win JPN Maruta Hiroki 2093.37
2 Black Win JPN Maruta Koji 2081.54
3 White Win JPN Inoue Fumiya 2313.17
4 Black Win JPN Kusajima Masato 2192.11
5 White Win JPN Ono Takayuki 2301.21
14th All Japan Championship
Date 2019-03-31 Rating 2495.28
Round Color Result Opponent
1 White Loss JPN Fujita Maiko 2201.41
2 Black Win JPN Chigira Makoto 2009.51
3 White Draw JPN Inoue Fumiya 2316.46
4 White Win JPN Ono Takayuki 2301.72
5 Black Loss JPN Nakamura Shigeru 2895.37
6 Black Loss JPN Okabe Hiroshi 2606.63
19 Renju Emperor Tournament Kanto area 1st round
Date 2018-10-21 Rating 2483.28
Round Color Result Opponent
1 Black Win JPN Demachi Koichiro 1855.30
2 White Loss JPN Iwano Fumio 2158.63
3 White Draw JPN Ishitani Shin-ichi 2340.59
4 White Loss JPN Inoue Fumiya 2304.50
56 Meijinsen Tournament
Date 2018-09-17 Rating 2485.22
Round Color Result Opponent
1 Black Win JPN Kuga Akio 2348.16
2 Black Loss JPN Matsuura Hiroshi 2262.06
3 White Win JPN Okabe Hiroshi 2608.03
5 Black Win JPN Kawamura Norihiko 2567.65
6 Black Loss JPN Ishitani Shin-ichi 2342.11
7 Black Loss JPN Kamiya Shunsuke 2698.20
8 White Loss JPN Nakamura Shigeru 2895.61
9 White Win JPN Hasegawa Kazuto 2498.36
35 Kanto Championship
Date 2018-07-16 Rating 2487.28
Round Color Result Opponent
4 Black Loss JPN Sato Kiyotomi 2359.95
5 White Win JPN Iwano Fumio 2162.22
6 White Win JPN Fujikawa Masaki 2023.99
56 Meijinsen Qualification East Japan area 2nd round
Date 2018-06-25 Rating 2488.71
Round Color Result Opponent
1 White Win JPN Kusajima Masato 2224.87
2 Black Win JPN Sato Kiyotomi 2360.43
3 White Loss JPN Ono Takayuki 2299.41
56 Meijinsen Qualification Kanto area 1st round
Date 2018-05-13 Rating 2492.43
Round Color Result Opponent
1 Black Loss JPN Mitsumori Masao 2248.49
2 Black Win JPN Iwano Fumio 2170.29
3 Black Win JPN Maruta Hiroki 2072.65
4 White Win JPN Sato Kiyotomi 2360.12
12th Team World Championship
Date 2018-05-05 Rating 2493.28
Round Color Result Opponent
1 Black Win EST Lillemaa Argo 2100.19
2 Black Win EST Purk Andry 2536.79
4 White Win RUS Kachaev Denis 2423.92
5 Black Win RUS Nikonov Konstantin 2580.47
6 Black Win CHN Liu Yang 2522.19
7 White Win RUS Lavrik-Karmazin Maksim 2371.45
8 White Draw RUS Artemyev Sergey 2457.77
9 Black Loss CHN Liu Yang 2522.19
10 White Loss EST Purk Andry 2536.79
13th All Japan Championship
Date 2018-01-28 Rating 2492.02
Round Color Result Opponent
1 White Loss JPN Ono Takayuki 2294.73
2 White Loss JPN Ishitani Shin-ichi 2331.76
3 White Loss JPN Miyamoto Syunju 2191.19
5 White Win JPN Sato Kiyotomi 2354.80
6 Black Win JPN Maruta Hiroki 2067.23
18 Kanto Renju Emperor Tournament 2nd round
Date 2017-12-31 Rating 2495.67
Round Color Result Opponent
1 Black Draw JPN Sato Kiyotomi 2356.36
2 Black Win JPN Miyamoto Syunju 2193.30
3 Black Loss JPN Nakamura Shigeru 2866.04
4 Black Loss JPN Okabe Hiroshi 2622.55
5 White Win JPN Kusajima Masato 2221.44
18 Kanto Renju Emperor Tournament 1st round
Date 2017-11-30 Rating 2500.40
Round Color Result Opponent
1 Black Win JPN Koyama Akihiro 1895.29
2 White Draw JPN Okabe Hiroshi 2623.56
3 Black Win JPN Ono Takayuki 2292.08
4 White Win JPN Kusajima Masato 2219.45
World Championship BT
Date 2017-08-12 Rating 2512.32
Round Color Result Opponent
1 Black Win EST Rahumagi Brenet 2219.63
2 Black Win MAC Sun In 2348.43
3 Black Draw CHN Liu Yang 2555.89
4 Black Win CHN Lan Zhiren 2538.59
5 Black Win TPE Yang Yu-Hsiung 2351.05
6 Black Loss MAC Tang Kai Lam 2667.72
7 Black Win EST Topkin Georg-Romet 2399.45
8 White Win TPE Huang Yen-Hua 2376.94
9 Black Loss JPN Okabe Hiroshi 2624.46
World Championship QT
Date 2017-08-05 Rating 2512.38
Round Color Result Opponent
1 White Win EST Rahumagi Brenet 2219.65
2 White Win RUS Sushkov Vladimir 2772.57
3 Black Loss CHN Lan Zhiren 2538.07
4 Black Loss CHN Mei Fan 2590.35
5 White Draw JPN Okabe Hiroshi 2624.56
6 Black Win KOR Kim Hong Soon 2237.02
7 Black Win TPE Lu Wei-Yuan 2507.89
55 Meijinsen Qualification East Japan area 2nd round
Date 2017-06-11 Rating 2509.02
Round Color Result Opponent
1 Black Win JPN Tomobe Katsuhiro 2078.64
2 White Loss JPN Tamada Yoichi 2441.47
3 White Loss JPN Ono Takayuki 2289.81
4 Black Win JPN Miyamoto Syunju 2185.58
5 Black Loss JPN Sato Kiyotomi 2385.89
12th All Japan Championship
Date 2017-03-26 Rating 2514.79
Round Color Result Opponent
1 Black Win JPN Kusajima Masato 2207.45
2 Black Loss JPN Nakamura Shigeru 2865.71
3 Black Win JPN Ishitani Shin-ichi 2312.25
4 Black Win JPN Nakayama Tomoharu 2700.56
5 Black Loss JPN Kamiya Shunsuke 2685.01
6 White Loss JPN Tachi Masaya 2452.03
20 New Year (Mikami) Cup
Date 2017-01-22 Rating 2518.83
Round Color Result Opponent
S2 Black Win JPN Sato Kiyotomi 2403.26
S3 Black Loss JPN Nakamura Shigeru 2864.11
S4 Black Win JPN Ishitani Shin-ichi 2311.33
S5 Black Loss JPN Okabe Hiroshi 2624.72
54 Meijinsen Tournament
Date 2016-09-19 Rating 2525.91
Round Color Result Opponent
1 White Win JPN Matsuura Hiroshi 2281.36
2 Black Loss JPN Kamiya Shunsuke 2660.96
3 White Draw JPN Hasegawa Kazuto 2548.18
4 White Draw JPN Iio Yoshihiro 2467.77
5 Black Win JPN Tanaka Toshiki 2373.81
6 Black Draw JPN Nakayama Tomoharu 2686.19
7 Black Draw JPN Maruyama Yasushi 2217.66
8 Black Win JPN Kuga Akio 2291.64
9 White Loss JPN Okabe Hiroshi 2625.55
33 Kanto Championship
Date 2016-07-31 Rating 2529.37
Round Color Result Opponent
1 White Win JPN Kato Yasuhiro 1972.29
2 Black Loss JPN Nakamura Shigeru 2856.29
3 Black Loss JPN Okabe Hiroshi 2629.28
4 Black Win JPN Nakamura Souta 2197.09
5 Black Draw JPN Nakayama Tomoharu 2684.45
6 Black Draw JPN Ishitani Shin-ichi 2307.94
54 Meijinsen Qualification East Japan area 2nd round
Date 2016-06-12 Rating 2534.21
Round Color Result Opponent
1 White Win JPN Kusajima Masato 2191.98
2 Black Win JPN Kamiya Shunsuke 2635.66
3 White Win JPN Tamada Yoichi 2471.90
4 Black Draw JPN Mitsumori Masao 2266.89
5 White Draw JPN Okabe Hiroshi 2631.72
19 Mikami Cup
Date 2016-03-13 Rating 2536.51
Round Color Result Opponent
S1 White Win JPN Ishitani Shin-ichi 2313.22
S2 Black Loss JPN Nakamura Shigeru 2845.15
S3 White Win JPN Kusajima Masato 2189.59
S4 Black Loss JPN Okabe Hiroshi 2630.59
16th Kanto Renju Emperor Tournament Final
Date 2016-02-14 Rating 2537.58
Round Color Result Opponent
1 Black Loss JPN Nakayama Tomoharu 2683.30
2 White Loss JPN Nakayama Tomoharu 2683.30
11th All Japan Championship
Date 2016-01-11 Rating 2540.41
Round Color Result Opponent
1 White Win JPN Maruta Hiroki 2045.67
2 Black Win JPN Nakamura Souta 2215.31
3 Black Win JPN Okabe Hiroshi 2628.36
4 Black Loss JPN Nakayama Tomoharu 2681.54
5 White Loss JPN Sato Kiyotomi 2434.64
6 White Draw JPN Tamada Yoichi 2477.84
16 Kanto Renju Emperor Tournament 2nd round
Date 2015-12-13 Rating 2543.33
Round Color Result Opponent
1 White Win JPN Sato Kiyotomi 2434.00
2 White Win JPN Ono Takayuki 2253.37
3 Black Loss JPN Okabe Hiroshi 2628.74
4 Black Draw JPN Nakayama Tomoharu 2679.68
5 White Win JPN Nakamura Shigeru 2832.56
17 Kanto Renju Emperor Tournament 1st round
Date 2015-11-23 Rating 2543.62
Round Color Result Opponent
1 Black Win JPN Demachi Koichiro 1856.17
2 Black Loss JPN Okabe Hiroshi 2629.65
3 Black Win JPN Iwano Fumio 2179.37
4 White Win JPN Ishitani Shin-ichi 2317.79
16 Kanto Renju Emperor Tournament 1st round
Date 2015-11-15 Rating 2543.76
Round Color Result Opponent
1 Black Win JPN Ishitani Shin-ichi 2317.18
2 Black Win JPN Sato Kiyotomi 2431.74
3 Black Win JPN Okabe Hiroshi 2629.82
4 Black Win JPN Ono Takayuki 2253.98
53 Meijinsen Tournament
Date 2015-09-22 Rating 2539.34
Round Color Result Opponent
1 Black Loss JPN Hasegawa Kazuto 2574.02
2 Black Win JPN Oosumi Yuuki 2686.64
3 White Win JPN Ishitani Shin-ichi 2315.76
4 Black Draw JPN Nakayama Tomoharu 2673.06
5 White Loss JPN Kawamura Norihiko 2537.66
6 White Loss JPN Tamada Yoichi 2486.54
7 Black Draw JPN Iio Yoshihiro 2446.19
8 White Win JPN Matsuura Hiroshi 2315.15
9 Black Draw JPN Okabe Hiroshi 2631.59
World Championship BT
Date 2015-08-12 Rating 2536.64
Round Color Result Opponent
1 White Win CHN Huang Xiuyi 2095.38
2 Black Loss JPN Miyagawa Junzo 2160.77
3 Black Win EST Topkin Georg-Romet 2235.29
4 Black Win TPE Wang Chih-Kung 2256.31
5 Black Loss RUS Sirategyan Karen 2331.22
6 Black Win JPN Ishitani Shin-ichi 2317.69
7 Black Win RUS Lavrik-Karmazin Maksim 2183.82
8 White Win JPN Mano Yoshihisa 2279.63
9 White Draw JPN Nakayama Tomoharu 2669.31
World Championship QT
Date 2015-08-05 Rating 2536.47
Round Color Result Opponent
1 Black Win EST Topkin Georg-Romet 2234.03
2 Black Win JPN Nakayama Tomoharu 2668.18
3 Black Loss JPN Kamiya Shunsuke 2609.42
4 White Draw CHN Wang Qingqing 2542.14
5 Black Win TPE Huang Yen-Hua 2379.21
6 Black Loss RUS Epifanov Dmitry 2605.68
7 Black Win TPE Lin Liu-Min 2477.15
Kanto Championship
Date 2015-07-20 Rating 2535.21
Round Color Result Opponent
1 White Win JPN Maruta Hiroki 2032.72
2 Black Win JPN Nakamura Shigeru 2818.54
3 Black Draw JPN Okabe Hiroshi 2638.31
4 White Win JPN Iwano Fumio 2180.90
5 Black Loss JPN Nakayama Tomoharu 2667.21
6 Black Win CHN Zhao Jiadong 2061.97
53 Meijinsen Qualification East Japan area 2nd round
Date 2015-06-14 Rating 2529.99
Round Color Result Opponent
1 White Loss JPN Tamada Yoichi 2492.58
2 Black Win JPN Sato Kiyotomi 2413.59
3 White Win JPN Ono Takayuki 2253.57
5 Black Draw JPN Kamiya Shunsuke 2598.42
6 White Win JPN Nakamura Souta 2207.81
53 Meijinsen Qualification East Japan area 1st round
Date 2015-05-10 Rating 2524.43
Round Color Result Opponent
1 Black Win JPN Mitsumori Masao 2250.38
2 Black Win JPN Iwano Fumio 2176.29
3 Black Win JPN Nakamura Souta 2206.14
4 White Loss JPN Kamiya Shunsuke 2593.03
10th All Japan Championship
Date 2015-03-29 Rating 2517.68
Round Color Result Opponent
1 White Win JPN Fujikawa Masaki 2030.21
2 White Loss JPN Kamiya Shunsuke 2583.82
3 Black Win JPN Kato Yasuhiro 1994.68
4 Black Win JPN Mitsumori Masao 2249.58
5 Black Loss JPN Ishitani Shin-ichi 2341.37
6 Black Win JPN Tanizaki Ryusuke 2131.82
12 Kanto Renju Emperor Tournament 1st round
Date 2011-10-23 Rating 2387.27
Round Color Result Opponent
1 Black Loss JPN Oosumi Yuuki 2683.27
2 White Win JPN Suzuki Rin 1932.08
3 White Loss JPN Isobe Taizan 2343.51
4 White Loss JPN Fukui Nobuhiro 2389.00
49 Meijinsen Qualification East-Japan area 1st round
Date 2011-06-12 Rating 2384.76
Round Color Result Opponent
1 Black Loss JPN Isobe Taizan 2334.84
2 Black Win JPN Kudomi Takahiro 2323.97
3 Black Loss JPN Nakayama Tomoharu 2478.04
4 Black Win JPN Ono Takayuki 2324.03
ex Black Loss JPN Nakayama Tomoharu 2478.04
28th Kanto Shineisen Tournament
Date 2011-04-17 Rating 2385.70
Round Color Result Opponent
1 White Win JPN Kon Akira 1942.81
2 Black Win JPN Kamiya Shunsuke 2366.78
3 White Win JPN Ozawa Tetsushi 2023.32
4 White Loss JPN Nakayama Tomoharu 2468.99
5 Black Win JPN Tomobe Katsuhiro 2155.72
5 White Loss JPN Kamiya Shunsuke 2366.78
14th Mikami Cup Tournament
Date 2011-01-30 Rating 2387.26
Round Color Result Opponent
A1 Black Win JPN Kon Akira 1938.28
A2 White Loss JPN Iwano Fumio 2075.39
A3 Black Win JPN Matsuoka Teruo 1950.56
A4 Black Win JPN Kise Katsumi 2448.73
A5 Black Win JPN Isobe Seiji 1954.99
8th Middle-dan Players Tournament
Date 2009-08-30 Rating 2399.58
Round Color Result Opponent
1 White Win JPN Yamamoto Yasuhiro 2098.67
2 White Win JPN Gakumazawa Hideaki 2005.31
3 Black Loss JPN Sato Kiyotomi 2323.43
4 White Win JPN Miyagawa Junzo 2130.70
5 White Draw JPN Maruyama Yasushi 2196.96
6 Black Win JPN Ono Takayuki 2305.96
46th Meijinsen Qualification East-Japan area 1st round
Date 2008-06-15 Rating 2412.78
Round Color Result Opponent
3 Black Win JPN Ono Takayuki 2305.79
4 Black Win JPN Kudomi Takahiro 2291.50
25th Kanto Shineisen Tournament
Date 2008-04-13 Rating 2411.47
Round Color Result Opponent
1 White Win JPN Fujikawa Masaki 2037.24
2 Black Win JPN Watanabe Tatsuya 2047.33
3 White Win JPN Tomobe Katsuhiro 2056.61
4 Black Win JPN Iwano Fumio 2180.59
5 Black Draw JPN Ono Takayuki 2306.44
2nd All Japan Championship (WC Qualification)
Date 2007-03-25 Rating 2392.31
Round Color Result Opponent
1 White Win JPN Kuramoto Hideharu 1912.43
2 Black Loss JPN Yamaguchi Yusui 2526.52
5 White Win JPN Tanno Yoshitaka 2046.38
6 Black Win JPN Ono Takayuki 2288.58