JPN Koyama Jun

Place: Tokyo, Japan

Rating: 2508.87, Rank: 55

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

Top rating: 2542.74 (2015-11-15)

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

Gy1: 38, Gy2: 69, Gy5: 205

57 Meijinsen Tournament
Date 2019-09-16 Rating 2508.87
Round Color Result Opponent
1 Black Draw JPN Inoue Fumiya 2301.94
2 White Loss JPN Kamiya Shunsuke 2715.89
3 Black Loss JPN Kawamura Norihiko 2587.60
4 White Win JPN Matsuura Hiroshi 2249.20
5 Black Loss JPN Nakayama Tomoharu 2725.98
6 White Loss JPN Kawano Takahisa 2354.03
7 White Loss JPN Hasegawa Kazuto 2540.52
8 White Win JPN Okabe Hiroshi 2622.72
9 Black Win JPN Ishitani Shin-ichi 2285.74
World Championship AT
Date 2019-08-10 Rating 2512.22
Round Color Result Opponent
1 Black Draw CHN Mei Fan 2591.16
2 Black Win EST Oll Aivo 2638.48
3 Black Win JPN Inoue Fumiya 2306.55
4 Black Win RUS Epifanov Dmitry 2533.96
5 Black Loss JPN Nakayama Tomoharu 2721.31
6 Black Win JPN Okabe Hiroshi 2619.18
7 Black Draw JPN Kamiya Shunsuke 2713.71
8 Black Draw SWE Gardstrom Petter 2610.17
9 White Loss RUS Fedotov Denis 2565.09
10 White Loss CHN Cao Dong 2697.15
11 Black Loss RUS Sushkov Vladimir 2728.74
World Championship QT
Date 2019-08-02 Rating 2512.07
Round Color Result Opponent
1 White Win SWE Sandstrom Richard 2267.75
2 White Win CHN Li Xiaoqing 2544.33
3 Black Loss EST Mesila Villem 2547.40
4 Black Win MAC Wai Chan Keong 2651.57
5 Black Draw RUS Fedotov Denis 2566.42
6 White Loss SWE Gardstrom Petter 2610.79
7 White Win EST Topkin Georg-Romet 2510.98
57 Meijinsen Qualification East Japan area 2nd round
Date 2019-06-23 Rating 2507.78
Round Color Result Opponent
1 Black Win JPN Maruta Hiroki 2072.41
2 Black Win JPN Maruta Koji 2084.73
3 White Win JPN Inoue Fumiya 2311.23
4 Black Win JPN Kusajima Masato 2197.45
5 White Win JPN Ono Takayuki 2296.22
14th All Japan Championship
Date 2019-03-31 Rating 2493.96
Round Color Result Opponent
1 White Loss JPN Fujita Maiko 2184.93
2 Black Win JPN Chigira Makoto 2007.97
3 White Draw JPN Inoue Fumiya 2314.48
4 White Win JPN Ono Takayuki 2297.32
5 Black Loss JPN Nakamura Shigeru 2893.48
6 Black Loss JPN Okabe Hiroshi 2605.10
19 Renju Emperor Tournament Kanto area 1st round
Date 2018-10-21 Rating 2482.16
Round Color Result Opponent
1 Black Win JPN Demachi Koichiro 1855.32
2 White Loss JPN Iwano Fumio 2172.26
3 White Draw JPN Ishitani Shin-ichi 2330.77
4 White Loss JPN Inoue Fumiya 2302.20
56 Meijinsen Tournament
Date 2018-09-17 Rating 2484.14
Round Color Result Opponent
1 Black Win JPN Kuga Akio 2347.48
2 Black Loss JPN Matsuura Hiroshi 2254.92
3 White Win JPN Okabe Hiroshi 2606.62
5 Black Win JPN Kawamura Norihiko 2570.46
6 Black Loss JPN Ishitani Shin-ichi 2333.24
7 Black Loss JPN Kamiya Shunsuke 2697.24
8 White Loss JPN Nakamura Shigeru 2893.89
9 White Win JPN Hasegawa Kazuto 2507.34
35 Kanto Championship
Date 2018-07-16 Rating 2486.28
Round Color Result Opponent
4 Black Loss JPN Sato Kiyotomi 2358.61
5 White Win JPN Iwano Fumio 2172.31
6 White Win JPN Fujikawa Masaki 2017.95
56 Meijinsen Qualification East Japan area 2nd round
Date 2018-06-25 Rating 2487.72
Round Color Result Opponent
1 White Win JPN Kusajima Masato 2227.57
2 Black Win JPN Sato Kiyotomi 2359.12
3 White Loss JPN Ono Takayuki 2296.59
56 Meijinsen Qualification Kanto area 1st round
Date 2018-05-13 Rating 2491.46
Round Color Result Opponent
1 Black Loss JPN Mitsumori Masao 2248.64
2 Black Win JPN Iwano Fumio 2178.57
3 Black Win JPN Maruta Hiroki 2063.63
4 White Win JPN Sato Kiyotomi 2358.86
12th Team World Championship
Date 2018-05-05 Rating 2492.32
Round Color Result Opponent
1 Black Win EST Lillemaa Argo 2099.05
2 Black Win EST Purk Andry 2536.24
4 White Win RUS Kachaev Denis 2430.75
5 Black Win RUS Nikonov Konstantin 2574.37
6 Black Win CHN Liu Yang 2519.51
7 White Win RUS Lavrik-Karmazin Maksim 2368.68
8 White Draw RUS Artemyev Sergey 2470.27
9 Black Loss CHN Liu Yang 2519.51
10 White Loss EST Purk Andry 2536.24
13th All Japan Championship
Date 2018-01-28 Rating 2490.97
Round Color Result Opponent
1 White Loss JPN Ono Takayuki 2292.31
2 White Loss JPN Ishitani Shin-ichi 2327.46
3 White Loss JPN Miyamoto Syunju 2193.23
5 White Win JPN Sato Kiyotomi 2353.65
6 Black Win JPN Maruta Hiroki 2059.96
18 Kanto Renju Emperor Tournament 2nd round
Date 2017-12-31 Rating 2494.60
Round Color Result Opponent
1 Black Draw JPN Sato Kiyotomi 2355.21
2 Black Win JPN Miyamoto Syunju 2195.22
3 Black Loss JPN Nakamura Shigeru 2864.44
4 Black Loss JPN Okabe Hiroshi 2621.38
5 White Win JPN Kusajima Masato 2223.39
18 Kanto Renju Emperor Tournament 1st round
Date 2017-11-30 Rating 2499.31
Round Color Result Opponent
1 Black Win JPN Koyama Akihiro 1894.00
2 White Draw JPN Okabe Hiroshi 2622.40
3 Black Win JPN Ono Takayuki 2289.82
4 White Win JPN Kusajima Masato 2221.30
World Championship BT
Date 2017-08-12 Rating 2511.14
Round Color Result Opponent
1 Black Win EST Rahumagi Brenet 2217.76
2 Black Win MAC Sun In 2343.92
3 Black Draw CHN Liu Yang 2552.11
4 Black Win CHN Lan Zhiren 2536.30
5 Black Win TPE Yang Yu-Hsiung 2349.31
6 Black Loss MAC Tang Kai Lam 2666.20
7 Black Win EST Topkin Georg-Romet 2398.24
8 White Win TPE Huang Yen-Hua 2374.98
9 Black Loss JPN Okabe Hiroshi 2623.31
World Championship QT
Date 2017-08-05 Rating 2511.20
Round Color Result Opponent
1 White Win EST Rahumagi Brenet 2217.77
2 White Win RUS Sushkov Vladimir 2772.01
3 Black Loss CHN Lan Zhiren 2535.78
4 Black Loss CHN Mei Fan 2587.32
5 White Draw JPN Okabe Hiroshi 2623.41
6 Black Win KOR Kim Hong Soon 2236.77
7 Black Win TPE Lu Wei-Yuan 2506.06
55 Meijinsen Qualification East Japan area 2nd round
Date 2017-06-11 Rating 2507.85
Round Color Result Opponent
1 Black Win JPN Tomobe Katsuhiro 2077.53
2 White Loss JPN Tamada Yoichi 2435.51
3 White Loss JPN Ono Takayuki 2287.81
4 Black Win JPN Miyamoto Syunju 2186.86
5 Black Loss JPN Sato Kiyotomi 2384.67
12th All Japan Championship
Date 2017-03-26 Rating 2513.68
Round Color Result Opponent
1 Black Win JPN Kusajima Masato 2208.57
2 Black Loss JPN Nakamura Shigeru 2864.29
3 Black Win JPN Ishitani Shin-ichi 2310.42
4 Black Win JPN Nakayama Tomoharu 2699.34
5 Black Loss JPN Kamiya Shunsuke 2683.80
6 White Loss JPN Tachi Masaya 2452.71
20 New Year (Mikami) Cup
Date 2017-01-22 Rating 2517.75
Round Color Result Opponent
S2 Black Win JPN Sato Kiyotomi 2402.09
S3 Black Loss JPN Nakamura Shigeru 2862.75
S4 Black Win JPN Ishitani Shin-ichi 2309.77
S5 Black Loss JPN Okabe Hiroshi 2623.76
54 Meijinsen Tournament
Date 2016-09-19 Rating 2524.90
Round Color Result Opponent
1 White Win JPN Matsuura Hiroshi 2278.33
2 Black Loss JPN Kamiya Shunsuke 2659.86
3 White Draw JPN Hasegawa Kazuto 2550.14
4 White Draw JPN Iio Yoshihiro 2469.60
5 Black Win JPN Tanaka Toshiki 2375.25
6 Black Draw JPN Nakayama Tomoharu 2685.12
7 Black Draw JPN Maruyama Yasushi 2216.72
8 Black Win JPN Kuga Akio 2290.95
9 White Loss JPN Okabe Hiroshi 2624.67
33 Kanto Championship
Date 2016-07-31 Rating 2528.35
Round Color Result Opponent
1 White Win JPN Kato Yasuhiro 1971.21
2 Black Loss JPN Nakamura Shigeru 2855.11
3 Black Loss JPN Okabe Hiroshi 2628.40
4 Black Win JPN Nakamura Souta 2195.99
5 Black Draw JPN Nakayama Tomoharu 2683.40
6 Black Draw JPN Ishitani Shin-ichi 2306.76
54 Meijinsen Qualification East Japan area 2nd round
Date 2016-06-12 Rating 2533.18
Round Color Result Opponent
1 White Win JPN Kusajima Masato 2192.55
2 Black Win JPN Kamiya Shunsuke 2634.56
3 White Win JPN Tamada Yoichi 2468.45
4 Black Draw JPN Mitsumori Masao 2266.41
5 White Draw JPN Okabe Hiroshi 2630.82
19 Mikami Cup
Date 2016-03-13 Rating 2535.48
Round Color Result Opponent
S1 White Win JPN Ishitani Shin-ichi 2312.14
S2 Black Loss JPN Nakamura Shigeru 2844.10
S3 White Win JPN Kusajima Masato 2190.04
S4 Black Loss JPN Okabe Hiroshi 2629.69
16th Kanto Renju Emperor Tournament Final
Date 2016-02-14 Rating 2536.56
Round Color Result Opponent
1 Black Loss JPN Nakayama Tomoharu 2682.29
2 White Loss JPN Nakayama Tomoharu 2682.29
11th All Japan Championship
Date 2016-01-11 Rating 2539.38
Round Color Result Opponent
1 White Win JPN Maruta Hiroki 2043.73
2 Black Win JPN Nakamura Souta 2214.23
3 Black Win JPN Okabe Hiroshi 2627.45
4 Black Loss JPN Nakayama Tomoharu 2680.54
5 White Loss JPN Sato Kiyotomi 2433.58
6 White Draw JPN Tamada Yoichi 2475.17
16 Kanto Renju Emperor Tournament 2nd round
Date 2015-12-13 Rating 2542.30
Round Color Result Opponent
1 White Win JPN Sato Kiyotomi 2432.95
2 White Win JPN Ono Takayuki 2251.99
3 Black Loss JPN Okabe Hiroshi 2627.83
4 Black Draw JPN Nakayama Tomoharu 2678.69
5 White Win JPN Nakamura Shigeru 2831.59
17 Kanto Renju Emperor Tournament 1st round
Date 2015-11-23 Rating 2542.60
Round Color Result Opponent
1 Black Win JPN Demachi Koichiro 1855.18
2 Black Loss JPN Okabe Hiroshi 2628.74
3 Black Win JPN Iwano Fumio 2179.50
4 White Win JPN Ishitani Shin-ichi 2316.78
16 Kanto Renju Emperor Tournament 1st round
Date 2015-11-15 Rating 2542.74
Round Color Result Opponent
1 Black Win JPN Ishitani Shin-ichi 2316.17
2 Black Win JPN Sato Kiyotomi 2430.70
3 Black Win JPN Okabe Hiroshi 2628.92
4 Black Win JPN Ono Takayuki 2252.62
53 Meijinsen Tournament
Date 2015-09-22 Rating 2538.32
Round Color Result Opponent
1 Black Loss JPN Hasegawa Kazuto 2574.65
2 Black Win JPN Oosumi Yuuki 2687.01
3 White Win JPN Ishitani Shin-ichi 2314.77
4 Black Draw JPN Nakayama Tomoharu 2672.10
5 White Loss JPN Kawamura Norihiko 2538.89
6 White Loss JPN Tamada Yoichi 2484.34
7 Black Draw JPN Iio Yoshihiro 2446.48
8 White Win JPN Matsuura Hiroshi 2312.90
9 Black Draw JPN Okabe Hiroshi 2630.70
World Championship BT
Date 2015-08-12 Rating 2535.60
Round Color Result Opponent
1 White Win CHN Huang Xiuyi 2095.12
2 Black Loss JPN Miyagawa Junzo 2160.02
3 Black Win EST Topkin Georg-Romet 2234.09
4 Black Win TPE Wang Chih-Kung 2255.26
5 Black Loss RUS Sirategyan Karen 2330.76
6 Black Win JPN Ishitani Shin-ichi 2316.70
7 Black Win RUS Lavrik-Karmazin Maksim 2183.01
8 White Win JPN Mano Yoshihisa 2279.07
9 White Draw JPN Nakayama Tomoharu 2668.34
World Championship QT
Date 2015-08-05 Rating 2535.43
Round Color Result Opponent
1 Black Win EST Topkin Georg-Romet 2232.84
2 Black Win JPN Nakayama Tomoharu 2667.20
3 Black Loss JPN Kamiya Shunsuke 2608.30
4 White Draw CHN Wang Qingqing 2538.80
5 Black Win TPE Huang Yen-Hua 2377.62
6 Black Loss RUS Epifanov Dmitry 2604.66
7 Black Win TPE Lin Liu-Min 2475.66
Kanto Championship
Date 2015-07-20 Rating 2534.16
Round Color Result Opponent
1 White Win JPN Maruta Hiroki 2031.10
2 Black Win JPN Nakamura Shigeru 2817.66
3 Black Draw JPN Okabe Hiroshi 2637.42
4 White Win JPN Iwano Fumio 2180.73
5 Black Loss JPN Nakayama Tomoharu 2666.23
6 Black Win CHN Zhao Jiadong 2052.79
53 Meijinsen Qualification East Japan area 2nd round
Date 2015-06-14 Rating 2528.94
Round Color Result Opponent
1 White Loss JPN Tamada Yoichi 2490.63
2 Black Win JPN Sato Kiyotomi 2412.58
3 White Win JPN Ono Takayuki 2252.31
5 Black Draw JPN Kamiya Shunsuke 2597.32
6 White Win JPN Nakamura Souta 2206.75
53 Meijinsen Qualification East Japan area 1st round
Date 2015-05-10 Rating 2523.38
Round Color Result Opponent
1 Black Win JPN Mitsumori Masao 2249.65
2 Black Win JPN Iwano Fumio 2175.98
3 Black Win JPN Nakamura Souta 2205.10
4 White Loss JPN Kamiya Shunsuke 2591.94
10th All Japan Championship
Date 2015-03-29 Rating 2516.63
Round Color Result Opponent
1 White Win JPN Fujikawa Masaki 2028.49
2 White Loss JPN Kamiya Shunsuke 2582.76
3 Black Win JPN Kato Yasuhiro 1993.65
4 Black Win JPN Mitsumori Masao 2248.84
5 Black Loss JPN Ishitani Shin-ichi 2340.48
6 Black Win JPN Tanizaki Ryusuke 2130.51
12 Kanto Renju Emperor Tournament 1st round
Date 2011-10-23 Rating 2386.21
Round Color Result Opponent
1 Black Loss JPN Oosumi Yuuki 2683.08
2 White Win JPN Suzuki Rin 1931.01
3 White Loss JPN Isobe Taizan 2342.25
4 White Loss JPN Fukui Nobuhiro 2387.98
49 Meijinsen Qualification East-Japan area 1st round
Date 2011-06-12 Rating 2383.68
Round Color Result Opponent
1 Black Loss JPN Isobe Taizan 2333.48
2 Black Win JPN Kudomi Takahiro 2322.79
3 Black Loss JPN Nakayama Tomoharu 2476.86
4 Black Win JPN Ono Takayuki 2323.22
ex Black Loss JPN Nakayama Tomoharu 2476.86
28th Kanto Shineisen Tournament
Date 2011-04-17 Rating 2384.62
Round Color Result Opponent
1 White Win JPN Kon Akira 1941.48
2 Black Win JPN Kamiya Shunsuke 2366.10
3 White Win JPN Ozawa Tetsushi 2022.08
4 White Loss JPN Nakayama Tomoharu 2467.84
5 Black Win JPN Tomobe Katsuhiro 2154.61
5 White Loss JPN Kamiya Shunsuke 2366.10
14th Mikami Cup Tournament
Date 2011-01-30 Rating 2386.17
Round Color Result Opponent
A1 Black Win JPN Kon Akira 1936.96
A2 White Loss JPN Iwano Fumio 2074.29
A3 Black Win JPN Matsuoka Teruo 1949.30
A4 Black Win JPN Kise Katsumi 2447.66
A5 Black Win JPN Isobe Seiji 1954.08
8th Middle-dan Players Tournament
Date 2009-08-30 Rating 2398.46
Round Color Result Opponent
1 White Win JPN Yamamoto Yasuhiro 2097.57
2 White Win JPN Gakumazawa Hideaki 2004.61
3 Black Loss JPN Sato Kiyotomi 2321.98
4 White Win JPN Miyagawa Junzo 2129.29
5 White Draw JPN Maruyama Yasushi 2195.74
6 Black Win JPN Ono Takayuki 2304.81
46th Meijinsen Qualification East-Japan area 1st round
Date 2008-06-15 Rating 2411.65
Round Color Result Opponent
3 Black Win JPN Ono Takayuki 2304.80
4 Black Win JPN Kudomi Takahiro 2289.97
25th Kanto Shineisen Tournament
Date 2008-04-13 Rating 2410.34
Round Color Result Opponent
1 White Win JPN Fujikawa Masaki 2036.02
2 Black Win JPN Watanabe Tatsuya 2046.24
3 White Win JPN Tomobe Katsuhiro 2055.57
4 Black Win JPN Iwano Fumio 2179.44
5 Black Draw JPN Ono Takayuki 2305.48
2nd All Japan Championship (WC Qualification)
Date 2007-03-25 Rating 2391.17
Round Color Result Opponent
1 White Win JPN Kuramoto Hideharu 1911.12
2 Black Loss JPN Yamaguchi Yusui 2523.83
5 White Win JPN Tanno Yoshitaka 2045.54
6 Black Win JPN Ono Takayuki 2288.12