JPN Koyama Jun

Place: Tokyo, Japan

Rating: 2519.10, Rank: 53

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

Top rating: 2551.61 (2015-11-15)

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

Gy1: 0, Gy2: 38, Gy5: 159

57 Meijinsen Tournament
Date 2019-09-16 Rating 2519.10
Round Color Result Opponent
1 Black Draw JPN Inoue Fumiya 2319.65
2 White Loss JPN Kamiya Shunsuke 2713.71
3 Black Loss JPN Kawamura Norihiko 2587.66
4 White Win JPN Matsuura Hiroshi 2261.88
5 Black Loss JPN Nakayama Tomoharu 2737.92
6 White Loss JPN Kawano Takahisa 2353.14
7 White Loss JPN Hasegawa Kazuto 2528.83
8 White Win JPN Okabe Hiroshi 2630.18
9 Black Win JPN Ishitani Shin-ichi 2311.08
World Championship AT
Date 2019-08-10 Rating 2522.58
Round Color Result Opponent
1 Black Draw CHN Mei Fan 2600.66
2 Black Win EST Oll Aivo 2651.82
3 Black Win JPN Inoue Fumiya 2324.26
4 Black Win RUS Epifanov Dmitry 2565.65
5 Black Loss JPN Nakayama Tomoharu 2733.06
6 Black Win JPN Okabe Hiroshi 2626.88
7 Black Draw JPN Kamiya Shunsuke 2712.52
8 Black Draw SWE Gardstrom Petter 2622.75
9 White Loss RUS Fedotov Denis 2573.68
10 White Loss CHN Cao Dong 2680.90
11 Black Loss RUS Sushkov Vladimir 2739.29
World Championship QT
Date 2019-08-02 Rating 2522.46
Round Color Result Opponent
1 White Win SWE Sandstrom Richard 2283.82
2 White Win CHN Li Xiaoqing 2564.43
3 Black Loss EST Mesila Villem 2564.84
4 Black Win MAC Wai Chan Keong 2666.09
5 Black Draw RUS Fedotov Denis 2575.34
6 White Loss SWE Gardstrom Petter 2623.39
7 White Win EST Topkin Georg-Romet 2528.90
57 Meijinsen Qualification East Japan area 2nd round
Date 2019-06-23 Rating 2518.19
Round Color Result Opponent
1 Black Win JPN Maruta Hiroki 2119.84
2 Black Win JPN Maruta Koji 2093.09
3 White Win JPN Inoue Fumiya 2328.73
4 Black Win JPN Kusajima Masato 2201.89
5 White Win JPN Ono Takayuki 2316.60
14th All Japan Championship
Date 2019-03-31 Rating 2504.22
Round Color Result Opponent
1 White Loss JPN Fujita Maiko 2219.33
2 Black Win JPN Chigira Makoto 2019.07
3 White Draw JPN Inoue Fumiya 2331.42
4 White Win JPN Ono Takayuki 2316.27
5 Black Loss JPN Nakamura Shigeru 2895.58
6 Black Loss JPN Okabe Hiroshi 2612.78
19 Renju Emperor Tournament Kanto area 1st round
Date 2018-10-21 Rating 2491.81
Round Color Result Opponent
1 Black Win JPN Demachi Koichiro 1869.10
2 White Loss JPN Iwano Fumio 2168.15
3 White Draw JPN Ishitani Shin-ichi 2344.32
4 White Loss JPN Inoue Fumiya 2318.52
56 Meijinsen Tournament
Date 2018-09-17 Rating 2493.66
Round Color Result Opponent
1 Black Win JPN Kuga Akio 2328.23
2 Black Loss JPN Matsuura Hiroshi 2264.45
3 White Win JPN Okabe Hiroshi 2614.57
5 Black Win JPN Kawamura Norihiko 2571.53
6 Black Loss JPN Ishitani Shin-ichi 2345.99
7 Black Loss JPN Kamiya Shunsuke 2700.39
8 White Loss JPN Nakamura Shigeru 2898.13
9 White Win JPN Hasegawa Kazuto 2504.42
35 Kanto Championship
Date 2018-07-16 Rating 2495.86
Round Color Result Opponent
4 Black Loss JPN Sato Kiyotomi 2368.68
5 White Win JPN Iwano Fumio 2172.47
6 White Win JPN Fujikawa Masaki 2037.78
56 Meijinsen Qualification East Japan area 2nd round
Date 2018-06-25 Rating 2497.34
Round Color Result Opponent
1 White Win JPN Kusajima Masato 2234.04
2 Black Win JPN Sato Kiyotomi 2369.14
3 White Loss JPN Ono Takayuki 2311.45
56 Meijinsen Qualification Kanto area 1st round
Date 2018-05-13 Rating 2501.13
Round Color Result Opponent
1 Black Loss JPN Mitsumori Masao 2258.36
2 Black Win JPN Iwano Fumio 2180.88
3 Black Win JPN Maruta Hiroki 2091.67
4 White Win JPN Sato Kiyotomi 2368.78
12th Team World Championship
Date 2018-05-05 Rating 2501.99
Round Color Result Opponent
1 Black Win EST Lillemaa Argo 2095.82
2 Black Win EST Purk Andry 2546.06
4 White Win RUS Kachaev Denis 2440.64
5 Black Win RUS Nikonov Konstantin 2594.22
6 Black Win CHN Liu Yang 2530.92
7 White Win RUS Lavrik-Karmazin Maksim 2386.73
8 White Draw RUS Artemyev Sergey 2471.69
9 Black Loss CHN Liu Yang 2530.92
10 White Loss EST Purk Andry 2546.06
13th All Japan Championship
Date 2018-01-28 Rating 2500.63
Round Color Result Opponent
1 White Loss JPN Ono Takayuki 2305.75
2 White Loss JPN Ishitani Shin-ichi 2336.83
3 White Loss JPN Miyamoto Syunju 2199.70
5 White Win JPN Sato Kiyotomi 2363.26
6 Black Win JPN Maruta Hiroki 2085.21
18 Kanto Renju Emperor Tournament 2nd round
Date 2017-12-31 Rating 2504.25
Round Color Result Opponent
1 Black Draw JPN Sato Kiyotomi 2364.80
2 Black Win JPN Miyamoto Syunju 2201.78
3 Black Loss JPN Nakamura Shigeru 2870.74
4 Black Loss JPN Okabe Hiroshi 2629.74
5 White Win JPN Kusajima Masato 2230.25
18 Kanto Renju Emperor Tournament 1st round
Date 2017-11-30 Rating 2508.96
Round Color Result Opponent
1 Black Win JPN Koyama Akihiro 1908.50
2 White Draw JPN Okabe Hiroshi 2630.81
3 Black Win JPN Ono Takayuki 2302.85
4 White Win JPN Kusajima Masato 2228.20
World Championship BT
Date 2017-08-12 Rating 2520.78
Round Color Result Opponent
1 Black Win EST Rahumagi Brenet 2234.25
2 Black Win MAC Sun In 2357.23
3 Black Draw CHN Liu Yang 2564.40
4 Black Win CHN Lan Zhiren 2547.39
5 Black Win TPE Yang Yu-Hsiung 2359.01
6 Black Loss MAC Tang Kai Lam 2677.78
7 Black Win EST Topkin Georg-Romet 2414.59
8 White Win TPE Huang Yen-Hua 2381.47
9 Black Loss JPN Okabe Hiroshi 2631.94
World Championship QT
Date 2017-08-05 Rating 2520.82
Round Color Result Opponent
1 White Win EST Rahumagi Brenet 2234.24
2 White Win RUS Sushkov Vladimir 2783.68
3 Black Loss CHN Lan Zhiren 2546.86
4 Black Loss CHN Mei Fan 2598.62
5 White Draw JPN Okabe Hiroshi 2632.05
6 Black Win KOR Kim Hong Soon 2241.56
7 Black Win TPE Lu Wei-Yuan 2516.96
55 Meijinsen Qualification East Japan area 2nd round
Date 2017-06-11 Rating 2517.35
Round Color Result Opponent
1 Black Win JPN Tomobe Katsuhiro 2092.83
2 White Loss JPN Tamada Yoichi 2455.65
3 White Loss JPN Ono Takayuki 2300.00
4 Black Win JPN Miyamoto Syunju 2193.82
5 Black Loss JPN Sato Kiyotomi 2394.28
12th All Japan Championship
Date 2017-03-26 Rating 2522.91
Round Color Result Opponent
1 Black Win JPN Kusajima Masato 2215.84
2 Black Loss JPN Nakamura Shigeru 2871.73
3 Black Win JPN Ishitani Shin-ichi 2318.22
4 Black Win JPN Nakayama Tomoharu 2708.60
5 Black Loss JPN Kamiya Shunsuke 2691.16
6 White Loss JPN Tachi Masaya 2455.99
20 New Year (Mikami) Cup
Date 2017-01-22 Rating 2526.81
Round Color Result Opponent
S2 Black Win JPN Sato Kiyotomi 2411.46
S3 Black Loss JPN Nakamura Shigeru 2870.26
S4 Black Win JPN Ishitani Shin-ichi 2317.47
S5 Black Loss JPN Okabe Hiroshi 2632.08
54 Meijinsen Tournament
Date 2016-09-19 Rating 2533.68
Round Color Result Opponent
1 White Win JPN Matsuura Hiroshi 2285.32
2 Black Loss JPN Kamiya Shunsuke 2667.58
3 White Draw JPN Hasegawa Kazuto 2554.25
4 White Draw JPN Iio Yoshihiro 2473.97
5 Black Win JPN Tanaka Toshiki 2378.74
6 Black Draw JPN Nakayama Tomoharu 2693.90
7 Black Draw JPN Maruyama Yasushi 2221.40
8 Black Win JPN Kuga Akio 2283.67
9 White Loss JPN Okabe Hiroshi 2632.85
33 Kanto Championship
Date 2016-07-31 Rating 2537.16
Round Color Result Opponent
1 White Win JPN Kato Yasuhiro 1991.15
2 Black Loss JPN Nakamura Shigeru 2862.72
3 Black Loss JPN Okabe Hiroshi 2636.65
4 Black Win JPN Nakamura Souta 2207.67
5 Black Draw JPN Nakayama Tomoharu 2692.16
6 Black Draw JPN Ishitani Shin-ichi 2314.73
54 Meijinsen Qualification East Japan area 2nd round
Date 2016-06-12 Rating 2542.02
Round Color Result Opponent
1 White Win JPN Kusajima Masato 2199.91
2 Black Win JPN Kamiya Shunsuke 2642.59
3 White Win JPN Tamada Yoichi 2482.75
4 Black Draw JPN Mitsumori Masao 2275.51
5 White Draw JPN Okabe Hiroshi 2639.14
19 Mikami Cup
Date 2016-03-13 Rating 2544.33
Round Color Result Opponent
S1 White Win JPN Ishitani Shin-ichi 2320.39
S2 Black Loss JPN Nakamura Shigeru 2851.74
S3 White Win JPN Kusajima Masato 2197.37
S4 Black Loss JPN Okabe Hiroshi 2638.07
16th Kanto Renju Emperor Tournament Final
Date 2016-02-14 Rating 2545.42
Round Color Result Opponent
1 Black Loss JPN Nakayama Tomoharu 2690.98
2 White Loss JPN Nakayama Tomoharu 2690.98
11th All Japan Championship
Date 2016-01-11 Rating 2548.26
Round Color Result Opponent
1 White Win JPN Maruta Hiroki 2056.29
2 Black Win JPN Nakamura Souta 2225.31
3 Black Win JPN Okabe Hiroshi 2635.88
4 Black Loss JPN Nakayama Tomoharu 2689.22
5 White Loss JPN Sato Kiyotomi 2442.48
6 White Draw JPN Tamada Yoichi 2487.60
16 Kanto Renju Emperor Tournament 2nd round
Date 2015-12-13 Rating 2551.17
Round Color Result Opponent
1 White Win JPN Sato Kiyotomi 2441.81
2 White Win JPN Ono Takayuki 2261.93
3 Black Loss JPN Okabe Hiroshi 2636.27
4 Black Draw JPN Nakayama Tomoharu 2687.36
5 White Win JPN Nakamura Shigeru 2839.23
17 Kanto Renju Emperor Tournament 1st round
Date 2015-11-23 Rating 2551.47
Round Color Result Opponent
1 Black Win JPN Demachi Koichiro 1867.52
2 Black Loss JPN Okabe Hiroshi 2637.19
3 Black Win JPN Iwano Fumio 2188.87
4 White Win JPN Ishitani Shin-ichi 2325.21
16 Kanto Renju Emperor Tournament 1st round
Date 2015-11-15 Rating 2551.61
Round Color Result Opponent
1 Black Win JPN Ishitani Shin-ichi 2324.63
2 Black Win JPN Sato Kiyotomi 2439.52
3 Black Win JPN Okabe Hiroshi 2637.37
4 Black Win JPN Ono Takayuki 2262.48
53 Meijinsen Tournament
Date 2015-09-22 Rating 2547.19
Round Color Result Opponent
1 Black Loss JPN Hasegawa Kazuto 2580.42
2 Black Win JPN Oosumi Yuuki 2693.37
3 White Win JPN Ishitani Shin-ichi 2323.31
4 Black Draw JPN Nakayama Tomoharu 2680.74
5 White Loss JPN Kawamura Norihiko 2544.33
6 White Loss JPN Tamada Yoichi 2495.63
7 Black Draw JPN Iio Yoshihiro 2452.83
8 White Win JPN Matsuura Hiroshi 2319.79
9 Black Draw JPN Okabe Hiroshi 2639.16
World Championship BT
Date 2015-08-12 Rating 2544.52
Round Color Result Opponent
1 White Win CHN Huang Xiuyi 2107.65
2 Black Loss JPN Miyagawa Junzo 2168.66
3 Black Win EST Topkin Georg-Romet 2250.93
4 Black Win TPE Wang Chih-Kung 2265.07
5 Black Loss RUS Sirategyan Karen 2343.49
6 Black Win JPN Ishitani Shin-ichi 2325.34
7 Black Win RUS Lavrik-Karmazin Maksim 2197.74
8 White Win JPN Mano Yoshihisa 2286.26
9 White Draw JPN Nakayama Tomoharu 2677.01
World Championship QT
Date 2015-08-05 Rating 2544.35
Round Color Result Opponent
1 Black Win EST Topkin Georg-Romet 2249.73
2 Black Win JPN Nakayama Tomoharu 2675.87
3 Black Loss JPN Kamiya Shunsuke 2617.06
4 White Draw CHN Wang Qingqing 2551.24
5 Black Win TPE Huang Yen-Hua 2386.60
6 Black Loss RUS Epifanov Dmitry 2616.40
7 Black Win TPE Lin Liu-Min 2485.50
Kanto Championship
Date 2015-07-20 Rating 2543.07
Round Color Result Opponent
1 White Win JPN Maruta Hiroki 2042.35
2 Black Win JPN Nakamura Shigeru 2825.28
3 Black Draw JPN Okabe Hiroshi 2645.86
4 White Win JPN Iwano Fumio 2189.98
5 Black Loss JPN Nakayama Tomoharu 2674.87
6 Black Win CHN Zhao Jiadong 2067.71
53 Meijinsen Qualification East Japan area 2nd round
Date 2015-06-14 Rating 2537.81
Round Color Result Opponent
1 White Loss JPN Tamada Yoichi 2501.25
2 Black Win JPN Sato Kiyotomi 2421.14
3 White Win JPN Ono Takayuki 2261.70
5 Black Draw JPN Kamiya Shunsuke 2606.02
6 White Win JPN Nakamura Souta 2216.93
53 Meijinsen Qualification East Japan area 1st round
Date 2015-05-10 Rating 2532.21
Round Color Result Opponent
1 Black Win JPN Mitsumori Masao 2258.28
2 Black Win JPN Iwano Fumio 2185.14
3 Black Win JPN Nakamura Souta 2215.14
4 White Loss JPN Kamiya Shunsuke 2600.59
10th All Japan Championship
Date 2015-03-29 Rating 2525.40
Round Color Result Opponent
1 White Win JPN Fujikawa Masaki 2038.91
2 White Loss JPN Kamiya Shunsuke 2591.34
3 Black Win JPN Kato Yasuhiro 2006.17
4 Black Win JPN Mitsumori Masao 2257.40
5 Black Loss JPN Ishitani Shin-ichi 2348.65
6 Black Win JPN Tanizaki Ryusuke 2140.96
12 Kanto Renju Emperor Tournament 1st round
Date 2011-10-23 Rating 2393.18
Round Color Result Opponent
1 Black Loss JPN Oosumi Yuuki 2688.98
2 White Win JPN Suzuki Rin 1937.35
3 White Loss JPN Isobe Taizan 2349.04
4 White Loss JPN Fukui Nobuhiro 2394.08
49 Meijinsen Qualification East-Japan area 1st round
Date 2011-06-12 Rating 2390.49
Round Color Result Opponent
1 Black Loss JPN Isobe Taizan 2340.23
2 Black Win JPN Kudomi Takahiro 2329.50
3 Black Loss JPN Nakayama Tomoharu 2483.41
4 Black Win JPN Ono Takayuki 2329.65
ex Black Loss JPN Nakayama Tomoharu 2483.41
28th Kanto Shineisen Tournament
Date 2011-04-17 Rating 2391.37
Round Color Result Opponent
1 White Win JPN Kon Akira 1947.72
2 Black Win JPN Kamiya Shunsuke 2372.24
3 White Win JPN Ozawa Tetsushi 2028.17
4 White Loss JPN Nakayama Tomoharu 2474.33
5 Black Win JPN Tomobe Katsuhiro 2161.06
5 White Loss JPN Kamiya Shunsuke 2372.24
14th Mikami Cup Tournament
Date 2011-01-30 Rating 2392.85
Round Color Result Opponent
A1 Black Win JPN Kon Akira 1943.09
A2 White Loss JPN Iwano Fumio 2080.57
A3 Black Win JPN Matsuoka Teruo 1955.29
A4 Black Win JPN Kise Katsumi 2454.31
A5 Black Win JPN Isobe Seiji 1959.34
8th Middle-dan Players Tournament
Date 2009-08-30 Rating 2404.72
Round Color Result Opponent
1 White Win JPN Yamamoto Yasuhiro 2102.78
2 White Win JPN Gakumazawa Hideaki 2009.53
3 Black Loss JPN Sato Kiyotomi 2327.78
4 White Win JPN Miyagawa Junzo 2135.35
5 White Draw JPN Maruyama Yasushi 2201.20
6 Black Win JPN Ono Takayuki 2310.90
46th Meijinsen Qualification East-Japan area 1st round
Date 2008-06-15 Rating 2417.66
Round Color Result Opponent
3 Black Win JPN Ono Takayuki 2310.45
4 Black Win JPN Kudomi Takahiro 2296.05
25th Kanto Shineisen Tournament
Date 2008-04-13 Rating 2416.32
Round Color Result Opponent
1 White Win JPN Fujikawa Masaki 2041.34
2 Black Win JPN Watanabe Tatsuya 2050.89
3 White Win JPN Tomobe Katsuhiro 2060.74
4 Black Win JPN Iwano Fumio 2184.88
5 Black Draw JPN Ono Takayuki 2311.02
2nd All Japan Championship (WC Qualification)
Date 2007-03-25 Rating 2397.01
Round Color Result Opponent
1 White Win JPN Kuramoto Hideharu 1915.83
2 Black Loss JPN Yamaguchi Yusui 2530.74
5 White Win JPN Tanno Yoshitaka 2050.17
6 Black Win JPN Ono Takayuki 2292.90