JPN Koyama Jun

Place: Tokyo, Japan

Rating: 2521.27, Rank: 49

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

Top rating: 2552.70 (2015-11-15)

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

Gy1: 0, Gy2: 32, Gy5: 134

57 Meijinsen Tournament
Date 2019-09-16 Rating 2521.27
Round Color Result Opponent
1 Black Draw JPN Inoue Fumiya 2333.17
2 White Loss JPN Kamiya Shunsuke 2717.98
3 Black Loss JPN Kawamura Norihiko 2587.85
4 White Win JPN Matsuura Hiroshi 2268.96
5 Black Loss JPN Nakayama Tomoharu 2735.28
6 White Loss JPN Kawano Takahisa 2356.37
7 White Loss JPN Hasegawa Kazuto 2524.74
8 White Win JPN Okabe Hiroshi 2644.05
9 Black Win JPN Ishitani Shin-ichi 2317.15
World Championship AT
Date 2019-08-10 Rating 2524.69
Round Color Result Opponent
1 Black Draw CHN Mei Fan 2588.60
2 Black Win EST Oll Aivo 2655.87
3 Black Win JPN Inoue Fumiya 2336.07
4 Black Win RUS Epifanov Dmitry 2577.40
5 Black Loss JPN Nakayama Tomoharu 2731.15
6 Black Win JPN Okabe Hiroshi 2639.42
7 Black Draw JPN Kamiya Shunsuke 2716.64
8 Black Draw SWE Gardstrom Petter 2627.32
9 White Loss RUS Fedotov Denis 2580.83
10 White Loss CHN Cao Dong 2682.86
11 Black Loss RUS Sushkov Vladimir 2742.37
World Championship QT
Date 2019-08-02 Rating 2524.54
Round Color Result Opponent
1 White Win SWE Sandstrom Richard 2291.38
2 White Win CHN Li Xiaoqing 2570.36
3 Black Loss EST Mesila Villem 2568.44
4 Black Win MAC Wai Chan Keong 2684.16
5 Black Draw RUS Fedotov Denis 2582.47
6 White Loss SWE Gardstrom Petter 2627.96
7 White Win EST Topkin Georg-Romet 2515.52
57 Meijinsen Qualification East Japan area 2nd round
Date 2019-06-23 Rating 2520.06
Round Color Result Opponent
1 Black Win JPN Maruta Hiroki 2092.00
2 Black Win JPN Maruta Koji 2036.01
3 White Win JPN Inoue Fumiya 2338.59
4 Black Win JPN Kusajima Masato 2179.92
5 White Win JPN Ono Takayuki 2307.30
14th All Japan Championship
Date 2019-03-31 Rating 2505.97
Round Color Result Opponent
1 White Loss JPN Fujita Maiko 2220.92
2 Black Win JPN Chigira Makoto 2015.68
3 White Draw JPN Inoue Fumiya 2339.33
4 White Win JPN Ono Takayuki 2308.01
5 Black Loss JPN Nakamura Shigeru 2901.46
6 Black Loss JPN Okabe Hiroshi 2622.09
19 Renju Emperor Tournament Kanto area 1st round
Date 2018-10-21 Rating 2493.25
Round Color Result Opponent
1 Black Win JPN Demachi Koichiro 1870.25
2 White Loss JPN Iwano Fumio 2166.03
3 White Draw JPN Ishitani Shin-ichi 2345.39
4 White Loss JPN Inoue Fumiya 2324.58
56 Meijinsen Tournament
Date 2018-09-17 Rating 2495.03
Round Color Result Opponent
1 Black Win JPN Kuga Akio 2321.75
2 Black Loss JPN Matsuura Hiroshi 2268.90
3 White Win JPN Okabe Hiroshi 2620.07
5 Black Win JPN Kawamura Norihiko 2571.81
6 Black Loss JPN Ishitani Shin-ichi 2346.96
7 Black Loss JPN Kamiya Shunsuke 2703.33
8 White Loss JPN Nakamura Shigeru 2902.67
9 White Win JPN Hasegawa Kazuto 2502.67
35 Kanto Championship
Date 2018-07-16 Rating 2497.13
Round Color Result Opponent
4 Black Loss JPN Sato Kiyotomi 2366.20
5 White Win JPN Iwano Fumio 2170.64
6 White Win JPN Fujikawa Masaki 2041.29
56 Meijinsen Qualification East Japan area 2nd round
Date 2018-06-25 Rating 2498.57
Round Color Result Opponent
1 White Win JPN Kusajima Masato 2221.30
2 Black Win JPN Sato Kiyotomi 2366.65
3 White Loss JPN Ono Takayuki 2306.09
56 Meijinsen Qualification Kanto area 1st round
Date 2018-05-13 Rating 2502.38
Round Color Result Opponent
1 Black Loss JPN Mitsumori Masao 2254.07
2 Black Win JPN Iwano Fumio 2179.26
3 Black Win JPN Maruta Hiroki 2079.97
4 White Win JPN Sato Kiyotomi 2366.30
12th Team World Championship
Date 2018-05-05 Rating 2503.26
Round Color Result Opponent
1 Black Win EST Lillemaa Argo 2104.79
2 Black Win EST Purk Andry 2549.78
4 White Win RUS Kachaev Denis 2453.63
5 Black Win RUS Nikonov Konstantin 2600.48
6 Black Win CHN Liu Yang 2534.49
7 White Win RUS Lavrik-Karmazin Maksim 2394.96
8 White Draw RUS Artemyev Sergey 2478.56
9 Black Loss CHN Liu Yang 2534.49
10 White Loss EST Purk Andry 2549.78
13th All Japan Championship
Date 2018-01-28 Rating 2501.66
Round Color Result Opponent
1 White Loss JPN Ono Takayuki 2301.56
2 White Loss JPN Ishitani Shin-ichi 2337.27
3 White Loss JPN Miyamoto Syunju 2194.79
5 White Win JPN Sato Kiyotomi 2361.00
6 Black Win JPN Maruta Hiroki 2076.21
18 Kanto Renju Emperor Tournament 2nd round
Date 2017-12-31 Rating 2505.24
Round Color Result Opponent
1 Black Draw JPN Sato Kiyotomi 2362.58
2 Black Win JPN Miyamoto Syunju 2196.99
3 Black Loss JPN Nakamura Shigeru 2874.16
4 Black Loss JPN Okabe Hiroshi 2632.38
5 White Win JPN Kusajima Masato 2220.46
18 Kanto Renju Emperor Tournament 1st round
Date 2017-11-30 Rating 2509.95
Round Color Result Opponent
1 Black Win JPN Koyama Akihiro 1908.04
2 White Draw JPN Okabe Hiroshi 2633.27
3 Black Win JPN Ono Takayuki 2298.98
4 White Win JPN Kusajima Masato 2218.83
World Championship BT
Date 2017-08-12 Rating 2521.84
Round Color Result Opponent
1 Black Win EST Rahumagi Brenet 2242.42
2 Black Win MAC Sun In 2361.46
3 Black Draw CHN Liu Yang 2568.08
4 Black Win CHN Lan Zhiren 2550.86
5 Black Win TPE Yang Yu-Hsiung 2362.10
6 Black Loss MAC Tang Kai Lam 2680.46
7 Black Win EST Topkin Georg-Romet 2419.85
8 White Win TPE Huang Yen-Hua 2376.36
9 Black Loss JPN Okabe Hiroshi 2633.98
World Championship QT
Date 2017-08-05 Rating 2521.88
Round Color Result Opponent
1 White Win EST Rahumagi Brenet 2242.39
2 White Win RUS Sushkov Vladimir 2787.18
3 Black Loss CHN Lan Zhiren 2550.33
4 Black Loss CHN Mei Fan 2600.03
5 White Draw JPN Okabe Hiroshi 2634.07
6 Black Win KOR Kim Hong Soon 2241.15
7 Black Win TPE Lu Wei-Yuan 2521.04
55 Meijinsen Qualification East Japan area 2nd round
Date 2017-06-11 Rating 2518.30
Round Color Result Opponent
1 Black Win JPN Tomobe Katsuhiro 2091.97
2 White Loss JPN Tamada Yoichi 2449.26
3 White Loss JPN Ono Takayuki 2296.88
4 Black Win JPN Miyamoto Syunju 2189.63
5 Black Loss JPN Sato Kiyotomi 2392.51
12th All Japan Championship
Date 2017-03-26 Rating 2523.83
Round Color Result Opponent
1 Black Win JPN Kusajima Masato 2209.23
2 Black Loss JPN Nakamura Shigeru 2874.25
3 Black Win JPN Ishitani Shin-ichi 2318.85
4 Black Win JPN Nakayama Tomoharu 2710.15
5 Black Loss JPN Kamiya Shunsuke 2692.91
6 White Loss JPN Tachi Masaya 2456.95
20 New Year (Mikami) Cup
Date 2017-01-22 Rating 2527.73
Round Color Result Opponent
S2 Black Win JPN Sato Kiyotomi 2410.12
S3 Black Loss JPN Nakamura Shigeru 2872.62
S4 Black Win JPN Ishitani Shin-ichi 2318.21
S5 Black Loss JPN Okabe Hiroshi 2633.58
54 Meijinsen Tournament
Date 2016-09-19 Rating 2534.59
Round Color Result Opponent
1 White Win JPN Matsuura Hiroshi 2287.46
2 Black Loss JPN Kamiya Shunsuke 2669.07
3 White Draw JPN Hasegawa Kazuto 2554.53
4 White Draw JPN Iio Yoshihiro 2473.83
5 Black Win JPN Tanaka Toshiki 2380.14
6 Black Draw JPN Nakayama Tomoharu 2695.38
7 Black Draw JPN Maruyama Yasushi 2221.44
8 Black Win JPN Kuga Akio 2282.60
9 White Loss JPN Okabe Hiroshi 2634.15
33 Kanto Championship
Date 2016-07-31 Rating 2538.08
Round Color Result Opponent
1 White Win JPN Kato Yasuhiro 1989.29
2 Black Loss JPN Nakamura Shigeru 2864.74
3 Black Loss JPN Okabe Hiroshi 2637.90
4 Black Win JPN Nakamura Souta 2208.21
5 Black Draw JPN Nakayama Tomoharu 2693.64
6 Black Draw JPN Ishitani Shin-ichi 2315.84
54 Meijinsen Qualification East Japan area 2nd round
Date 2016-06-12 Rating 2542.93
Round Color Result Opponent
1 White Win JPN Kusajima Masato 2195.48
2 Black Win JPN Kamiya Shunsuke 2643.99
3 White Win JPN Tamada Yoichi 2479.75
4 Black Draw JPN Mitsumori Masao 2273.42
5 White Draw JPN Okabe Hiroshi 2640.36
19 Mikami Cup
Date 2016-03-13 Rating 2545.31
Round Color Result Opponent
S1 White Win JPN Ishitani Shin-ichi 2321.74
S2 Black Loss JPN Nakamura Shigeru 2853.54
S3 White Win JPN Kusajima Masato 2193.54
S4 Black Loss JPN Okabe Hiroshi 2639.29
16th Kanto Renju Emperor Tournament Final
Date 2016-02-14 Rating 2546.42
Round Color Result Opponent
1 Black Loss JPN Nakayama Tomoharu 2692.50
2 White Loss JPN Nakayama Tomoharu 2692.50
11th All Japan Championship
Date 2016-01-11 Rating 2549.28
Round Color Result Opponent
1 White Win JPN Maruta Hiroki 2055.28
2 Black Win JPN Nakamura Souta 2225.87
3 Black Win JPN Okabe Hiroshi 2637.12
4 Black Loss JPN Nakayama Tomoharu 2690.74
5 White Loss JPN Sato Kiyotomi 2442.12
6 White Draw JPN Tamada Yoichi 2485.78
16 Kanto Renju Emperor Tournament 2nd round
Date 2015-12-13 Rating 2552.23
Round Color Result Opponent
1 White Win JPN Sato Kiyotomi 2441.52
2 White Win JPN Ono Takayuki 2261.07
3 Black Loss JPN Okabe Hiroshi 2637.53
4 Black Draw JPN Nakayama Tomoharu 2688.90
5 White Win JPN Nakamura Shigeru 2840.90
17 Kanto Renju Emperor Tournament 1st round
Date 2015-11-23 Rating 2552.55
Round Color Result Opponent
1 Black Win JPN Demachi Koichiro 1868.02
2 Black Loss JPN Okabe Hiroshi 2638.46
3 Black Win JPN Iwano Fumio 2188.38
4 White Win JPN Ishitani Shin-ichi 2326.67
16 Kanto Renju Emperor Tournament 1st round
Date 2015-11-15 Rating 2552.70
Round Color Result Opponent
1 Black Win JPN Ishitani Shin-ichi 2326.10
2 Black Win JPN Sato Kiyotomi 2439.29
3 Black Win JPN Okabe Hiroshi 2638.65
4 Black Win JPN Ono Takayuki 2261.71
53 Meijinsen Tournament
Date 2015-09-22 Rating 2548.37
Round Color Result Opponent
1 Black Loss JPN Hasegawa Kazuto 2581.33
2 Black Win JPN Oosumi Yuuki 2694.25
3 White Win JPN Ishitani Shin-ichi 2324.90
4 Black Draw JPN Nakayama Tomoharu 2682.35
5 White Loss JPN Kawamura Norihiko 2545.39
6 White Loss JPN Tamada Yoichi 2494.48
7 Black Draw JPN Iio Yoshihiro 2453.65
8 White Win JPN Matsuura Hiroshi 2321.75
9 Black Draw JPN Okabe Hiroshi 2640.49
World Championship BT
Date 2015-08-12 Rating 2545.77
Round Color Result Opponent
1 White Win CHN Huang Xiuyi 2113.30
2 Black Loss JPN Miyagawa Junzo 2170.70
3 Black Win EST Topkin Georg-Romet 2258.14
4 Black Win TPE Wang Chih-Kung 2269.05
5 Black Loss RUS Sirategyan Karen 2350.35
6 Black Win JPN Ishitani Shin-ichi 2327.04
7 Black Win RUS Lavrik-Karmazin Maksim 2204.71
8 White Win JPN Mano Yoshihisa 2287.65
9 White Draw JPN Nakayama Tomoharu 2678.67
World Championship QT
Date 2015-08-05 Rating 2545.60
Round Color Result Opponent
1 Black Win EST Topkin Georg-Romet 2256.95
2 Black Win JPN Nakayama Tomoharu 2677.53
3 Black Loss JPN Kamiya Shunsuke 2618.53
4 White Draw CHN Wang Qingqing 2554.96
5 Black Win TPE Huang Yen-Hua 2388.09
6 Black Loss RUS Epifanov Dmitry 2620.03
7 Black Win TPE Lin Liu-Min 2488.50
Kanto Championship
Date 2015-07-20 Rating 2544.31
Round Color Result Opponent
1 White Win JPN Maruta Hiroki 2041.91
2 Black Win JPN Nakamura Shigeru 2826.81
3 Black Draw JPN Okabe Hiroshi 2647.24
4 White Win JPN Iwano Fumio 2189.74
5 Black Loss JPN Nakayama Tomoharu 2676.52
6 Black Win CHN Zhao Jiadong 2068.32
53 Meijinsen Qualification East Japan area 2nd round
Date 2015-06-14 Rating 2539.02
Round Color Result Opponent
1 White Loss JPN Tamada Yoichi 2500.50
2 Black Win JPN Sato Kiyotomi 2421.22
3 White Win JPN Ono Takayuki 2261.46
5 Black Draw JPN Kamiya Shunsuke 2607.42
6 White Win JPN Nakamura Souta 2217.40
53 Meijinsen Qualification East Japan area 1st round
Date 2015-05-10 Rating 2533.41
Round Color Result Opponent
1 Black Win JPN Mitsumori Masao 2257.55
2 Black Win JPN Iwano Fumio 2185.02
3 Black Win JPN Nakamura Souta 2215.60
4 White Loss JPN Kamiya Shunsuke 2601.96
10th All Japan Championship
Date 2015-03-29 Rating 2526.59
Round Color Result Opponent
1 White Win JPN Fujikawa Masaki 2039.33
2 White Loss JPN Kamiya Shunsuke 2592.67
3 Black Win JPN Kato Yasuhiro 2005.70
4 Black Win JPN Mitsumori Masao 2256.80
5 Black Loss JPN Ishitani Shin-ichi 2350.17
6 Black Win JPN Tanizaki Ryusuke 2141.61
12 Kanto Renju Emperor Tournament 1st round
Date 2011-10-23 Rating 2394.36
Round Color Result Opponent
1 Black Loss JPN Oosumi Yuuki 2690.26
2 White Win JPN Suzuki Rin 1938.12
3 White Loss JPN Isobe Taizan 2350.08
4 White Loss JPN Fukui Nobuhiro 2395.66
49 Meijinsen Qualification East-Japan area 1st round
Date 2011-06-12 Rating 2391.67
Round Color Result Opponent
1 Black Loss JPN Isobe Taizan 2341.23
2 Black Win JPN Kudomi Takahiro 2330.70
3 Black Loss JPN Nakayama Tomoharu 2484.93
4 Black Win JPN Ono Takayuki 2331.15
ex Black Loss JPN Nakayama Tomoharu 2484.93
28th Kanto Shineisen Tournament
Date 2011-04-17 Rating 2392.54
Round Color Result Opponent
1 White Win JPN Kon Akira 1948.92
2 Black Win JPN Kamiya Shunsuke 2373.67
3 White Win JPN Ozawa Tetsushi 2029.34
4 White Loss JPN Nakayama Tomoharu 2475.78
5 Black Win JPN Tomobe Katsuhiro 2162.07
5 White Loss JPN Kamiya Shunsuke 2373.67
14th Mikami Cup Tournament
Date 2011-01-30 Rating 2394.01
Round Color Result Opponent
A1 Black Win JPN Kon Akira 1944.28
A2 White Loss JPN Iwano Fumio 2081.58
A3 Black Win JPN Matsuoka Teruo 1956.26
A4 Black Win JPN Kise Katsumi 2456.08
A5 Black Win JPN Isobe Seiji 1960.00
8th Middle-dan Players Tournament
Date 2009-08-30 Rating 2405.76
Round Color Result Opponent
1 White Win JPN Yamamoto Yasuhiro 2104.10
2 White Win JPN Gakumazawa Hideaki 2009.95
3 Black Loss JPN Sato Kiyotomi 2329.17
4 White Win JPN Miyagawa Junzo 2136.71
5 White Draw JPN Maruyama Yasushi 2202.40
6 Black Win JPN Ono Takayuki 2312.22
46th Meijinsen Qualification East-Japan area 1st round
Date 2008-06-15 Rating 2418.56
Round Color Result Opponent
3 Black Win JPN Ono Takayuki 2311.78
4 Black Win JPN Kudomi Takahiro 2297.22
25th Kanto Shineisen Tournament
Date 2008-04-13 Rating 2417.19
Round Color Result Opponent
1 White Win JPN Fujikawa Masaki 2042.27
2 Black Win JPN Watanabe Tatsuya 2051.75
3 White Win JPN Tomobe Katsuhiro 2061.65
4 Black Win JPN Iwano Fumio 2185.88
5 Black Draw JPN Ono Takayuki 2312.30
2nd All Japan Championship (WC Qualification)
Date 2007-03-25 Rating 2397.71
Round Color Result Opponent
1 White Win JPN Kuramoto Hideharu 1916.06
2 Black Loss JPN Yamaguchi Yusui 2526.80
5 White Win JPN Tanno Yoshitaka 2050.66
6 Black Win JPN Ono Takayuki 2294.06