JPN Koyama Jun

Place: Tokyo, Japan

Rating: 2519.75, Rank: 50

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

Top rating: 2553.11 (2015-11-15)

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

Gy1: 0, Gy2: 38, Gy5: 140

57 Meijinsen Tournament
Date 2019-09-16 Rating 2519.75
Round Color Result Opponent
1 Black Draw JPN Inoue Fumiya 2317.93
2 White Loss JPN Kamiya Shunsuke 2712.64
3 Black Loss JPN Kawamura Norihiko 2593.40
4 White Win JPN Matsuura Hiroshi 2263.05
5 Black Loss JPN Nakayama Tomoharu 2731.43
6 White Loss JPN Kawano Takahisa 2353.41
7 White Loss JPN Hasegawa Kazuto 2523.35
8 White Win JPN Okabe Hiroshi 2629.15
9 Black Win JPN Ishitani Shin-ichi 2314.38
World Championship AT
Date 2019-08-10 Rating 2523.26
Round Color Result Opponent
1 Black Draw CHN Mei Fan 2587.63
2 Black Win EST Oll Aivo 2654.66
3 Black Win JPN Inoue Fumiya 2322.69
4 Black Win RUS Epifanov Dmitry 2577.09
5 Black Loss JPN Nakayama Tomoharu 2727.56
6 Black Win JPN Okabe Hiroshi 2626.00
7 Black Draw JPN Kamiya Shunsuke 2711.60
8 Black Draw SWE Gardstrom Petter 2626.57
9 White Loss RUS Fedotov Denis 2579.65
10 White Loss CHN Cao Dong 2681.87
11 Black Loss RUS Sushkov Vladimir 2741.18
World Championship QT
Date 2019-08-02 Rating 2523.15
Round Color Result Opponent
1 White Win SWE Sandstrom Richard 2291.93
2 White Win CHN Li Xiaoqing 2570.11
3 Black Loss EST Mesila Villem 2568.24
4 Black Win MAC Wai Chan Keong 2683.30
5 Black Draw RUS Fedotov Denis 2581.33
6 White Loss SWE Gardstrom Petter 2627.23
7 White Win EST Topkin Georg-Romet 2514.16
57 Meijinsen Qualification East Japan area 2nd round
Date 2019-06-23 Rating 2518.84
Round Color Result Opponent
1 Black Win JPN Maruta Hiroki 2119.33
2 Black Win JPN Maruta Koji 2094.37
3 White Win JPN Inoue Fumiya 2327.33
4 Black Win JPN Kusajima Masato 2185.45
5 White Win JPN Ono Takayuki 2314.44
14th All Japan Championship
Date 2019-03-31 Rating 2504.89
Round Color Result Opponent
1 White Loss JPN Fujita Maiko 2217.48
2 Black Win JPN Chigira Makoto 2018.01
3 White Draw JPN Inoue Fumiya 2330.39
4 White Win JPN Ono Takayuki 2314.42
5 Black Loss JPN Nakamura Shigeru 2896.37
6 Black Loss JPN Okabe Hiroshi 2612.25
19 Renju Emperor Tournament Kanto area 1st round
Date 2018-10-21 Rating 2492.61
Round Color Result Opponent
1 Black Win JPN Demachi Koichiro 1870.92
2 White Loss JPN Iwano Fumio 2168.99
3 White Draw JPN Ishitani Shin-ichi 2345.01
4 White Loss JPN Inoue Fumiya 2317.99
56 Meijinsen Tournament
Date 2018-09-17 Rating 2494.49
Round Color Result Opponent
1 Black Win JPN Kuga Akio 2319.16
2 Black Loss JPN Matsuura Hiroshi 2265.04
3 White Win JPN Okabe Hiroshi 2614.30
5 Black Win JPN Kawamura Norihiko 2573.48
6 Black Loss JPN Ishitani Shin-ichi 2346.67
7 Black Loss JPN Kamiya Shunsuke 2700.23
8 White Loss JPN Nakamura Shigeru 2898.83
9 White Win JPN Hasegawa Kazuto 2500.47
35 Kanto Championship
Date 2018-07-16 Rating 2496.85
Round Color Result Opponent
4 Black Loss JPN Sato Kiyotomi 2368.32
5 White Win JPN Iwano Fumio 2173.42
6 White Win JPN Fujikawa Masaki 2039.43
56 Meijinsen Qualification East Japan area 2nd round
Date 2018-06-25 Rating 2498.38
Round Color Result Opponent
1 White Win JPN Kusajima Masato 2226.09
2 Black Win JPN Sato Kiyotomi 2368.78
3 White Loss JPN Ono Takayuki 2310.61
56 Meijinsen Qualification Kanto area 1st round
Date 2018-05-13 Rating 2502.31
Round Color Result Opponent
1 Black Loss JPN Mitsumori Masao 2258.97
2 Black Win JPN Iwano Fumio 2181.93
3 Black Win JPN Maruta Hiroki 2092.11
4 White Win JPN Sato Kiyotomi 2368.43
12th Team World Championship
Date 2018-05-05 Rating 2503.20
Round Color Result Opponent
1 Black Win EST Lillemaa Argo 2103.24
2 Black Win EST Purk Andry 2550.65
4 White Win RUS Kachaev Denis 2455.58
5 Black Win RUS Nikonov Konstantin 2600.54
6 Black Win CHN Liu Yang 2534.27
7 White Win RUS Lavrik-Karmazin Maksim 2394.05
8 White Draw RUS Artemyev Sergey 2478.41
9 Black Loss CHN Liu Yang 2534.27
10 White Loss EST Purk Andry 2550.65
13th All Japan Championship
Date 2018-01-28 Rating 2501.76
Round Color Result Opponent
1 White Loss JPN Ono Takayuki 2305.38
2 White Loss JPN Ishitani Shin-ichi 2337.81
3 White Loss JPN Miyamoto Syunju 2197.97
5 White Win JPN Sato Kiyotomi 2362.93
6 Black Win JPN Maruta Hiroki 2085.94
18 Kanto Renju Emperor Tournament 2nd round
Date 2017-12-31 Rating 2505.36
Round Color Result Opponent
1 Black Draw JPN Sato Kiyotomi 2364.49
2 Black Win JPN Miyamoto Syunju 2200.10
3 Black Loss JPN Nakamura Shigeru 2871.66
4 Black Loss JPN Okabe Hiroshi 2629.81
5 White Win JPN Kusajima Masato 2224.38
18 Kanto Renju Emperor Tournament 1st round
Date 2017-11-30 Rating 2510.08
Round Color Result Opponent
1 Black Win JPN Koyama Akihiro 1910.26
2 White Draw JPN Okabe Hiroshi 2630.97
3 Black Win JPN Ono Takayuki 2302.61
4 White Win JPN Kusajima Masato 2222.63
World Championship BT
Date 2017-08-12 Rating 2521.99
Round Color Result Opponent
1 Black Win EST Rahumagi Brenet 2241.02
2 Black Win MAC Sun In 2361.85
3 Black Draw CHN Liu Yang 2567.87
4 Black Win CHN Lan Zhiren 2550.56
5 Black Win TPE Yang Yu-Hsiung 2361.94
6 Black Loss MAC Tang Kai Lam 2680.65
7 Black Win EST Topkin Georg-Romet 2418.91
8 White Win TPE Huang Yen-Hua 2375.61
9 Black Loss JPN Okabe Hiroshi 2632.46
World Championship QT
Date 2017-08-05 Rating 2522.04
Round Color Result Opponent
1 White Win EST Rahumagi Brenet 2240.99
2 White Win RUS Sushkov Vladimir 2786.73
3 Black Loss CHN Lan Zhiren 2550.03
4 Black Loss CHN Mei Fan 2599.59
5 White Draw JPN Okabe Hiroshi 2632.59
6 Black Win KOR Kim Hong Soon 2244.35
7 Black Win TPE Lu Wei-Yuan 2520.25
55 Meijinsen Qualification East Japan area 2nd round
Date 2017-06-11 Rating 2518.52
Round Color Result Opponent
1 Black Win JPN Tomobe Katsuhiro 2095.66
2 White Loss JPN Tamada Yoichi 2455.08
3 White Loss JPN Ono Takayuki 2300.11
4 Black Win JPN Miyamoto Syunju 2192.39
5 Black Loss JPN Sato Kiyotomi 2394.31
12th All Japan Championship
Date 2017-03-26 Rating 2524.04
Round Color Result Opponent
1 Black Win JPN Kusajima Masato 2212.24
2 Black Loss JPN Nakamura Shigeru 2872.84
3 Black Win JPN Ishitani Shin-ichi 2319.83
4 Black Win JPN Nakayama Tomoharu 2709.50
5 Black Loss JPN Kamiya Shunsuke 2692.00
6 White Loss JPN Tachi Masaya 2455.08
20 New Year (Mikami) Cup
Date 2017-01-22 Rating 2527.94
Round Color Result Opponent
S2 Black Win JPN Sato Kiyotomi 2411.77
S3 Black Loss JPN Nakamura Shigeru 2871.40
S4 Black Win JPN Ishitani Shin-ichi 2319.20
S5 Black Loss JPN Okabe Hiroshi 2632.83
54 Meijinsen Tournament
Date 2016-09-19 Rating 2534.81
Round Color Result Opponent
1 White Win JPN Matsuura Hiroshi 2286.00
2 Black Loss JPN Kamiya Shunsuke 2668.64
3 White Draw JPN Hasegawa Kazuto 2553.78
4 White Draw JPN Iio Yoshihiro 2473.35
5 Black Win JPN Tanaka Toshiki 2377.02
6 Black Draw JPN Nakayama Tomoharu 2695.01
7 Black Draw JPN Maruyama Yasushi 2222.42
8 Black Win JPN Kuga Akio 2280.15
9 White Loss JPN Okabe Hiroshi 2633.74
33 Kanto Championship
Date 2016-07-31 Rating 2538.35
Round Color Result Opponent
1 White Win JPN Kato Yasuhiro 1993.85
2 Black Loss JPN Nakamura Shigeru 2863.92
3 Black Loss JPN Okabe Hiroshi 2637.63
4 Black Win JPN Nakamura Souta 2209.31
5 Black Draw JPN Nakayama Tomoharu 2693.36
6 Black Draw JPN Ishitani Shin-ichi 2316.75
54 Meijinsen Qualification East Japan area 2nd round
Date 2016-06-12 Rating 2543.25
Round Color Result Opponent
1 White Win JPN Kusajima Masato 2197.76
2 Black Win JPN Kamiya Shunsuke 2643.83
3 White Win JPN Tamada Yoichi 2483.06
4 Black Draw JPN Mitsumori Masao 2276.41
5 White Draw JPN Okabe Hiroshi 2640.20
19 Mikami Cup
Date 2016-03-13 Rating 2545.68
Round Color Result Opponent
S1 White Win JPN Ishitani Shin-ichi 2322.52
S2 Black Loss JPN Nakamura Shigeru 2853.01
S3 White Win JPN Kusajima Masato 2195.61
S4 Black Loss JPN Okabe Hiroshi 2639.30
16th Kanto Renju Emperor Tournament Final
Date 2016-02-14 Rating 2546.80
Round Color Result Opponent
1 Black Loss JPN Nakayama Tomoharu 2692.46
2 White Loss JPN Nakayama Tomoharu 2692.46
11th All Japan Championship
Date 2016-01-11 Rating 2549.68
Round Color Result Opponent
1 White Win JPN Maruta Hiroki 2057.68
2 Black Win JPN Nakamura Souta 2226.89
3 Black Win JPN Okabe Hiroshi 2637.23
4 Black Loss JPN Nakayama Tomoharu 2690.75
5 White Loss JPN Sato Kiyotomi 2443.42
6 White Draw JPN Tamada Yoichi 2488.26
16 Kanto Renju Emperor Tournament 2nd round
Date 2015-12-13 Rating 2552.64
Round Color Result Opponent
1 White Win JPN Sato Kiyotomi 2442.79
2 White Win JPN Ono Takayuki 2262.92
3 Black Loss JPN Okabe Hiroshi 2637.69
4 Black Draw JPN Nakayama Tomoharu 2688.94
5 White Win JPN Nakamura Shigeru 2840.53
17 Kanto Renju Emperor Tournament 1st round
Date 2015-11-23 Rating 2552.96
Round Color Result Opponent
1 Black Win JPN Demachi Koichiro 1869.16
2 Black Loss JPN Okabe Hiroshi 2638.65
3 Black Win JPN Iwano Fumio 2190.32
4 White Win JPN Ishitani Shin-ichi 2327.36
16 Kanto Renju Emperor Tournament 1st round
Date 2015-11-15 Rating 2553.11
Round Color Result Opponent
1 Black Win JPN Ishitani Shin-ichi 2326.78
2 Black Win JPN Sato Kiyotomi 2440.53
3 Black Win JPN Okabe Hiroshi 2638.85
4 Black Win JPN Ono Takayuki 2263.51
53 Meijinsen Tournament
Date 2015-09-22 Rating 2548.78
Round Color Result Opponent
1 Black Loss JPN Hasegawa Kazuto 2581.08
2 Black Win JPN Oosumi Yuuki 2694.39
3 White Win JPN Ishitani Shin-ichi 2325.52
4 Black Draw JPN Nakayama Tomoharu 2682.49
5 White Loss JPN Kawamura Norihiko 2545.65
6 White Loss JPN Tamada Yoichi 2496.48
7 Black Draw JPN Iio Yoshihiro 2453.49
8 White Win JPN Matsuura Hiroshi 2320.94
9 Black Draw JPN Okabe Hiroshi 2640.74
World Championship BT
Date 2015-08-12 Rating 2546.18
Round Color Result Opponent
1 White Win CHN Huang Xiuyi 2113.09
2 Black Loss JPN Miyagawa Junzo 2170.43
3 Black Win EST Topkin Georg-Romet 2256.54
4 Black Win TPE Wang Chih-Kung 2268.83
5 Black Loss RUS Sirategyan Karen 2348.74
6 Black Win JPN Ishitani Shin-ichi 2327.64
7 Black Win RUS Lavrik-Karmazin Maksim 2203.88
8 White Win JPN Mano Yoshihisa 2288.96
9 White Draw JPN Nakayama Tomoharu 2678.85
World Championship QT
Date 2015-08-05 Rating 2546.01
Round Color Result Opponent
1 Black Win EST Topkin Georg-Romet 2255.35
2 Black Win JPN Nakayama Tomoharu 2677.71
3 Black Loss JPN Kamiya Shunsuke 2618.95
4 White Draw CHN Wang Qingqing 2555.45
5 Black Win TPE Huang Yen-Hua 2388.09
6 Black Loss RUS Epifanov Dmitry 2620.63
7 Black Win TPE Lin Liu-Min 2488.55
Kanto Championship
Date 2015-07-20 Rating 2544.73
Round Color Result Opponent
1 White Win JPN Maruta Hiroki 2043.73
2 Black Win JPN Nakamura Shigeru 2826.65
3 Black Draw JPN Okabe Hiroshi 2647.55
4 White Win JPN Iwano Fumio 2191.41
5 Black Loss JPN Nakayama Tomoharu 2676.72
6 Black Win CHN Zhao Jiadong 2068.41
53 Meijinsen Qualification East Japan area 2nd round
Date 2015-06-14 Rating 2539.46
Round Color Result Opponent
1 White Loss JPN Tamada Yoichi 2502.24
2 Black Win JPN Sato Kiyotomi 2422.29
3 White Win JPN Ono Takayuki 2262.96
5 Black Draw JPN Kamiya Shunsuke 2607.89
6 White Win JPN Nakamura Souta 2218.43
53 Meijinsen Qualification East Japan area 1st round
Date 2015-05-10 Rating 2533.86
Round Color Result Opponent
1 Black Win JPN Mitsumori Masao 2259.49
2 Black Win JPN Iwano Fumio 2186.56
3 Black Win JPN Nakamura Souta 2216.63
4 White Loss JPN Kamiya Shunsuke 2602.46
10th All Japan Championship
Date 2015-03-29 Rating 2527.05
Round Color Result Opponent
1 White Win JPN Fujikawa Masaki 2040.33
2 White Loss JPN Kamiya Shunsuke 2593.21
3 Black Win JPN Kato Yasuhiro 2008.02
4 Black Win JPN Mitsumori Masao 2258.65
5 Black Loss JPN Ishitani Shin-ichi 2350.78
6 Black Win JPN Tanizaki Ryusuke 2142.51
12 Kanto Renju Emperor Tournament 1st round
Date 2011-10-23 Rating 2394.78
Round Color Result Opponent
1 Black Loss JPN Oosumi Yuuki 2690.67
2 White Win JPN Suzuki Rin 1938.65
3 White Loss JPN Isobe Taizan 2350.58
4 White Loss JPN Fukui Nobuhiro 2396.04
49 Meijinsen Qualification East-Japan area 1st round
Date 2011-06-12 Rating 2392.08
Round Color Result Opponent
1 Black Loss JPN Isobe Taizan 2341.70
2 Black Win JPN Kudomi Takahiro 2331.18
3 Black Loss JPN Nakayama Tomoharu 2485.34
4 Black Win JPN Ono Takayuki 2331.67
ex Black Loss JPN Nakayama Tomoharu 2485.34
28th Kanto Shineisen Tournament
Date 2011-04-17 Rating 2392.95
Round Color Result Opponent
1 White Win JPN Kon Akira 1948.92
2 Black Win JPN Kamiya Shunsuke 2374.13
3 White Win JPN Ozawa Tetsushi 2029.38
4 White Loss JPN Nakayama Tomoharu 2476.20
5 Black Win JPN Tomobe Katsuhiro 2162.55
5 White Loss JPN Kamiya Shunsuke 2374.13
14th Mikami Cup Tournament
Date 2011-01-30 Rating 2394.41
Round Color Result Opponent
A1 Black Win JPN Kon Akira 1944.32
A2 White Loss JPN Iwano Fumio 2082.01
A3 Black Win JPN Matsuoka Teruo 1956.63
A4 Black Win JPN Kise Katsumi 2456.14
A5 Black Win JPN Isobe Seiji 1960.30
8th Middle-dan Players Tournament
Date 2009-08-30 Rating 2406.16
Round Color Result Opponent
1 White Win JPN Yamamoto Yasuhiro 2104.48
2 White Win JPN Gakumazawa Hideaki 2010.44
3 Black Loss JPN Sato Kiyotomi 2329.47
4 White Win JPN Miyagawa Junzo 2136.91
5 White Draw JPN Maruyama Yasushi 2202.78
6 Black Win JPN Ono Takayuki 2312.69
46th Meijinsen Qualification East-Japan area 1st round
Date 2008-06-15 Rating 2418.96
Round Color Result Opponent
3 Black Win JPN Ono Takayuki 2312.23
4 Black Win JPN Kudomi Takahiro 2297.62
25th Kanto Shineisen Tournament
Date 2008-04-13 Rating 2417.59
Round Color Result Opponent
1 White Win JPN Fujikawa Masaki 2042.61
2 Black Win JPN Watanabe Tatsuya 2052.04
3 White Win JPN Tomobe Katsuhiro 2062.01
4 Black Win JPN Iwano Fumio 2186.26
5 Black Draw JPN Ono Takayuki 2312.75
2nd All Japan Championship (WC Qualification)
Date 2007-03-25 Rating 2398.12
Round Color Result Opponent
1 White Win JPN Kuramoto Hideharu 1916.98
2 Black Loss JPN Yamaguchi Yusui 2527.21
5 White Win JPN Tanno Yoshitaka 2051.09
6 Black Win JPN Ono Takayuki 2294.56