JPN Koyama Jun

Place: Tokyo, Japan

Rating: 2512.11, Rank: 51

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

Top rating: 2544.46 (2015-11-15)

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

Gy1: 32, Gy2: 56, Gy5: 195

57 Meijinsen Tournament
Date 2019-09-16 Rating 2512.11
Round Color Result Opponent
1 Black Draw JPN Inoue Fumiya 2307.24
2 White Loss JPN Kamiya Shunsuke 2718.34
3 Black Loss JPN Kawamura Norihiko 2589.41
4 White Win JPN Matsuura Hiroshi 2252.11
5 Black Loss JPN Nakayama Tomoharu 2728.94
6 White Loss JPN Kawano Takahisa 2356.86
7 White Loss JPN Hasegawa Kazuto 2541.85
8 White Win JPN Okabe Hiroshi 2626.03
9 Black Win JPN Ishitani Shin-ichi 2300.67
World Championship AT
Date 2019-08-10 Rating 2515.44
Round Color Result Opponent
1 Black Draw CHN Mei Fan 2592.66
2 Black Win EST Oll Aivo 2640.76
3 Black Win JPN Inoue Fumiya 2311.69
4 Black Win RUS Epifanov Dmitry 2548.11
5 Black Loss JPN Nakayama Tomoharu 2724.26
6 Black Win JPN Okabe Hiroshi 2622.43
7 Black Draw JPN Kamiya Shunsuke 2716.11
8 Black Draw SWE Gardstrom Petter 2612.79
9 White Loss RUS Fedotov Denis 2572.44
10 White Loss CHN Cao Dong 2676.37
11 Black Loss RUS Sushkov Vladimir 2729.27
World Championship QT
Date 2019-08-02 Rating 2515.29
Round Color Result Opponent
1 White Win SWE Sandstrom Richard 2271.15
2 White Win CHN Li Xiaoqing 2554.94
3 Black Loss EST Mesila Villem 2551.62
4 Black Win MAC Wai Chan Keong 2656.13
5 Black Draw RUS Fedotov Denis 2573.59
6 White Loss SWE Gardstrom Petter 2613.40
7 White Win EST Topkin Georg-Romet 2515.15
57 Meijinsen Qualification East Japan area 2nd round
Date 2019-06-23 Rating 2510.96
Round Color Result Opponent
1 Black Win JPN Maruta Hiroki 2076.68
2 Black Win JPN Maruta Koji 2088.47
3 White Win JPN Inoue Fumiya 2316.19
4 Black Win JPN Kusajima Masato 2201.43
5 White Win JPN Ono Takayuki 2300.57
14th All Japan Championship
Date 2019-03-31 Rating 2497.01
Round Color Result Opponent
1 White Loss JPN Fujita Maiko 2190.53
2 Black Win JPN Chigira Makoto 2010.64
3 White Draw JPN Inoue Fumiya 2319.17
4 White Win JPN Ono Takayuki 2301.45
5 Black Loss JPN Nakamura Shigeru 2896.35
6 Black Loss JPN Okabe Hiroshi 2608.21
19 Renju Emperor Tournament Kanto area 1st round
Date 2018-10-21 Rating 2484.92
Round Color Result Opponent
1 Black Win JPN Demachi Koichiro 1857.68
2 White Loss JPN Iwano Fumio 2176.26
3 White Draw JPN Ishitani Shin-ichi 2336.14
4 White Loss JPN Inoue Fumiya 2306.52
56 Meijinsen Tournament
Date 2018-09-17 Rating 2486.83
Round Color Result Opponent
1 Black Win JPN Kuga Akio 2349.62
2 Black Loss JPN Matsuura Hiroshi 2257.36
3 White Win JPN Okabe Hiroshi 2609.49
5 Black Win JPN Kawamura Norihiko 2572.07
6 Black Loss JPN Ishitani Shin-ichi 2338.19
7 Black Loss JPN Kamiya Shunsuke 2699.52
8 White Loss JPN Nakamura Shigeru 2896.62
9 White Win JPN Hasegawa Kazuto 2508.78
35 Kanto Championship
Date 2018-07-16 Rating 2488.83
Round Color Result Opponent
4 Black Loss JPN Sato Kiyotomi 2361.06
5 White Win JPN Iwano Fumio 2176.05
6 White Win JPN Fujikawa Masaki 2021.66
56 Meijinsen Qualification East Japan area 2nd round
Date 2018-06-25 Rating 2490.23
Round Color Result Opponent
1 White Win JPN Kusajima Masato 2230.92
2 Black Win JPN Sato Kiyotomi 2361.56
3 White Loss JPN Ono Takayuki 2300.01
56 Meijinsen Qualification Kanto area 1st round
Date 2018-05-13 Rating 2493.87
Round Color Result Opponent
1 Black Loss JPN Mitsumori Masao 2251.25
2 Black Win JPN Iwano Fumio 2182.15
3 Black Win JPN Maruta Hiroki 2067.05
4 White Win JPN Sato Kiyotomi 2361.27
12th Team World Championship
Date 2018-05-05 Rating 2494.70
Round Color Result Opponent
1 Black Win EST Lillemaa Argo 2100.54
2 Black Win EST Purk Andry 2537.23
4 White Win RUS Kachaev Denis 2423.89
5 Black Win RUS Nikonov Konstantin 2580.79
6 Black Win CHN Liu Yang 2522.55
7 White Win RUS Lavrik-Karmazin Maksim 2371.73
8 White Draw RUS Artemyev Sergey 2458.11
9 Black Loss CHN Liu Yang 2522.55
10 White Loss EST Purk Andry 2537.23
13th All Japan Championship
Date 2018-01-28 Rating 2493.33
Round Color Result Opponent
1 White Loss JPN Ono Takayuki 2295.39
2 White Loss JPN Ishitani Shin-ichi 2330.56
3 White Loss JPN Miyamoto Syunju 2196.36
5 White Win JPN Sato Kiyotomi 2355.97
6 Black Win JPN Maruta Hiroki 2063.16
18 Kanto Renju Emperor Tournament 2nd round
Date 2017-12-31 Rating 2496.96
Round Color Result Opponent
1 Black Draw JPN Sato Kiyotomi 2357.51
2 Black Win JPN Miyamoto Syunju 2198.31
3 Black Loss JPN Nakamura Shigeru 2866.98
4 Black Loss JPN Okabe Hiroshi 2623.79
5 White Win JPN Kusajima Masato 2226.44
18 Kanto Renju Emperor Tournament 1st round
Date 2017-11-30 Rating 2501.65
Round Color Result Opponent
1 Black Win JPN Koyama Akihiro 1896.53
2 White Draw JPN Okabe Hiroshi 2624.77
3 Black Win JPN Ono Takayuki 2292.79
4 White Win JPN Kusajima Masato 2224.30
World Championship BT
Date 2017-08-12 Rating 2513.41
Round Color Result Opponent
1 Black Win EST Rahumagi Brenet 2219.70
2 Black Win MAC Sun In 2349.07
3 Black Draw CHN Liu Yang 2556.27
4 Black Win CHN Lan Zhiren 2538.97
5 Black Win TPE Yang Yu-Hsiung 2351.45
6 Black Loss MAC Tang Kai Lam 2668.34
7 Black Win EST Topkin Georg-Romet 2400.04
8 White Win TPE Huang Yen-Hua 2377.27
9 Black Loss JPN Okabe Hiroshi 2625.57
World Championship QT
Date 2017-08-05 Rating 2513.47
Round Color Result Opponent
1 White Win EST Rahumagi Brenet 2219.70
2 White Win RUS Sushkov Vladimir 2773.61
3 Black Loss CHN Lan Zhiren 2538.45
4 Black Loss CHN Mei Fan 2590.74
5 White Draw JPN Okabe Hiroshi 2625.66
6 Black Win KOR Kim Hong Soon 2239.36
7 Black Win TPE Lu Wei-Yuan 2508.25
55 Meijinsen Qualification East Japan area 2nd round
Date 2017-06-11 Rating 2510.06
Round Color Result Opponent
1 Black Win JPN Tomobe Katsuhiro 2080.26
2 White Loss JPN Tamada Yoichi 2437.47
3 White Loss JPN Ono Takayuki 2290.47
4 Black Win JPN Miyamoto Syunju 2189.66
5 Black Loss JPN Sato Kiyotomi 2386.82
12th All Japan Championship
Date 2017-03-26 Rating 2515.80
Round Color Result Opponent
1 Black Win JPN Kusajima Masato 2211.21
2 Black Loss JPN Nakamura Shigeru 2866.56
3 Black Win JPN Ishitani Shin-ichi 2312.24
4 Black Win JPN Nakayama Tomoharu 2701.49
5 Black Loss JPN Kamiya Shunsuke 2685.90
6 White Loss JPN Tachi Masaya 2454.34
20 New Year (Mikami) Cup
Date 2017-01-22 Rating 2519.80
Round Color Result Opponent
S2 Black Win JPN Sato Kiyotomi 2404.15
S3 Black Loss JPN Nakamura Shigeru 2864.95
S4 Black Win JPN Ishitani Shin-ichi 2311.42
S5 Black Loss JPN Okabe Hiroshi 2625.79
54 Meijinsen Tournament
Date 2016-09-19 Rating 2526.82
Round Color Result Opponent
1 White Win JPN Matsuura Hiroshi 2280.02
2 Black Loss JPN Kamiya Shunsuke 2661.80
3 White Draw JPN Hasegawa Kazuto 2551.46
4 White Draw JPN Iio Yoshihiro 2470.55
5 Black Win JPN Tanaka Toshiki 2376.55
6 Black Draw JPN Nakayama Tomoharu 2687.06
7 Black Draw JPN Maruyama Yasushi 2215.77
8 Black Win JPN Kuga Akio 2292.72
9 White Loss JPN Okabe Hiroshi 2626.56
33 Kanto Championship
Date 2016-07-31 Rating 2530.24
Round Color Result Opponent
1 White Win JPN Kato Yasuhiro 1972.97
2 Black Loss JPN Nakamura Shigeru 2857.11
3 Black Loss JPN Okabe Hiroshi 2630.25
4 Black Win JPN Nakamura Souta 2197.84
5 Black Draw JPN Nakayama Tomoharu 2685.30
6 Black Draw JPN Ishitani Shin-ichi 2308.15
54 Meijinsen Qualification East Japan area 2nd round
Date 2016-06-12 Rating 2535.04
Round Color Result Opponent
1 White Win JPN Kusajima Masato 2194.87
2 Black Win JPN Kamiya Shunsuke 2636.44
3 White Win JPN Tamada Yoichi 2470.19
4 Black Draw JPN Mitsumori Masao 2268.50
5 White Draw JPN Okabe Hiroshi 2632.64
19 Mikami Cup
Date 2016-03-13 Rating 2537.28
Round Color Result Opponent
S1 White Win JPN Ishitani Shin-ichi 2313.47
S2 Black Loss JPN Nakamura Shigeru 2845.95
S3 White Win JPN Kusajima Masato 2192.26
S4 Black Loss JPN Okabe Hiroshi 2631.44
16th Kanto Renju Emperor Tournament Final
Date 2016-02-14 Rating 2538.33
Round Color Result Opponent
1 Black Loss JPN Nakayama Tomoharu 2684.05
2 White Loss JPN Nakayama Tomoharu 2684.05
11th All Japan Championship
Date 2016-01-11 Rating 2541.14
Round Color Result Opponent
1 White Win JPN Maruta Hiroki 2045.78
2 Black Win JPN Nakamura Souta 2216.01
3 Black Win JPN Okabe Hiroshi 2629.16
4 Black Loss JPN Nakayama Tomoharu 2682.27
5 White Loss JPN Sato Kiyotomi 2435.41
6 White Draw JPN Tamada Yoichi 2476.82
16 Kanto Renju Emperor Tournament 2nd round
Date 2015-12-13 Rating 2544.04
Round Color Result Opponent
1 White Win JPN Sato Kiyotomi 2434.76
2 White Win JPN Ono Takayuki 2253.99
3 Black Loss JPN Okabe Hiroshi 2629.52
4 Black Draw JPN Nakayama Tomoharu 2680.39
5 White Win JPN Nakamura Shigeru 2833.34
17 Kanto Renju Emperor Tournament 1st round
Date 2015-11-23 Rating 2544.32
Round Color Result Opponent
1 Black Win JPN Demachi Koichiro 1857.21
2 Black Loss JPN Okabe Hiroshi 2630.41
3 Black Win JPN Iwano Fumio 2181.63
4 White Win JPN Ishitani Shin-ichi 2318.10
16 Kanto Renju Emperor Tournament 1st round
Date 2015-11-15 Rating 2544.46
Round Color Result Opponent
1 Black Win JPN Ishitani Shin-ichi 2317.50
2 Black Win JPN Sato Kiyotomi 2432.49
3 Black Win JPN Okabe Hiroshi 2630.59
4 Black Win JPN Ono Takayuki 2254.60
53 Meijinsen Tournament
Date 2015-09-22 Rating 2540.01
Round Color Result Opponent
1 Black Loss JPN Hasegawa Kazuto 2575.93
2 Black Win JPN Oosumi Yuuki 2688.03
3 White Win JPN Ishitani Shin-ichi 2316.09
4 Black Draw JPN Nakayama Tomoharu 2673.73
5 White Loss JPN Kawamura Norihiko 2539.31
6 White Loss JPN Tamada Yoichi 2485.93
7 Black Draw JPN Iio Yoshihiro 2447.65
8 White Win JPN Matsuura Hiroshi 2314.49
9 Black Draw JPN Okabe Hiroshi 2632.32
World Championship BT
Date 2015-08-12 Rating 2537.27
Round Color Result Opponent
1 White Win CHN Huang Xiuyi 2095.81
2 Black Loss JPN Miyagawa Junzo 2161.29
3 Black Win EST Topkin Georg-Romet 2234.90
4 Black Win TPE Wang Chih-Kung 2256.50
5 Black Loss RUS Sirategyan Karen 2331.22
6 Black Win JPN Ishitani Shin-ichi 2318.03
7 Black Win RUS Lavrik-Karmazin Maksim 2183.69
8 White Win JPN Mano Yoshihisa 2279.07
9 White Draw JPN Nakayama Tomoharu 2669.95
World Championship QT
Date 2015-08-05 Rating 2537.10
Round Color Result Opponent
1 Black Win EST Topkin Georg-Romet 2233.65
2 Black Win JPN Nakayama Tomoharu 2668.81
3 Black Loss JPN Kamiya Shunsuke 2609.98
4 White Draw CHN Wang Qingqing 2542.16
5 Black Win TPE Huang Yen-Hua 2379.40
6 Black Loss RUS Epifanov Dmitry 2605.89
7 Black Win TPE Lin Liu-Min 2477.36
Kanto Championship
Date 2015-07-20 Rating 2535.84
Round Color Result Opponent
1 White Win JPN Maruta Hiroki 2033.01
2 Black Win JPN Nakamura Shigeru 2819.28
3 Black Draw JPN Okabe Hiroshi 2639.01
4 White Win JPN Iwano Fumio 2182.74
5 Black Loss JPN Nakayama Tomoharu 2667.84
6 Black Win CHN Zhao Jiadong 2062.15
53 Meijinsen Qualification East Japan area 2nd round
Date 2015-06-14 Rating 2530.61
Round Color Result Opponent
1 White Loss JPN Tamada Yoichi 2492.19
2 Black Win JPN Sato Kiyotomi 2414.29
3 White Win JPN Ono Takayuki 2254.15
5 Black Draw JPN Kamiya Shunsuke 2598.97
6 White Win JPN Nakamura Souta 2208.47
53 Meijinsen Qualification East Japan area 1st round
Date 2015-05-10 Rating 2525.05
Round Color Result Opponent
1 Black Win JPN Mitsumori Masao 2251.45
2 Black Win JPN Iwano Fumio 2177.93
3 Black Win JPN Nakamura Souta 2206.80
4 White Loss JPN Kamiya Shunsuke 2593.57
10th All Japan Championship
Date 2015-03-29 Rating 2518.29
Round Color Result Opponent
1 White Win JPN Fujikawa Masaki 2030.50
2 White Loss JPN Kamiya Shunsuke 2584.36
3 Black Win JPN Kato Yasuhiro 1995.32
4 Black Win JPN Mitsumori Masao 2250.61
5 Black Loss JPN Ishitani Shin-ichi 2341.76
6 Black Win JPN Tanizaki Ryusuke 2132.42
12 Kanto Renju Emperor Tournament 1st round
Date 2011-10-23 Rating 2387.65
Round Color Result Opponent
1 Black Loss JPN Oosumi Yuuki 2683.54
2 White Win JPN Suzuki Rin 1932.44
3 White Loss JPN Isobe Taizan 2343.85
4 White Loss JPN Fukui Nobuhiro 2389.31
49 Meijinsen Qualification East-Japan area 1st round
Date 2011-06-12 Rating 2385.11
Round Color Result Opponent
1 Black Loss JPN Isobe Taizan 2335.15
2 Black Win JPN Kudomi Takahiro 2324.28
3 Black Loss JPN Nakayama Tomoharu 2478.40
4 Black Win JPN Ono Takayuki 2324.30
ex Black Loss JPN Nakayama Tomoharu 2478.40
28th Kanto Shineisen Tournament
Date 2011-04-17 Rating 2386.05
Round Color Result Opponent
1 White Win JPN Kon Akira 1942.93
2 Black Win JPN Kamiya Shunsuke 2367.23
3 White Win JPN Ozawa Tetsushi 2023.51
4 White Loss JPN Nakayama Tomoharu 2469.35
5 Black Win JPN Tomobe Katsuhiro 2156.05
5 White Loss JPN Kamiya Shunsuke 2367.23
14th Mikami Cup Tournament
Date 2011-01-30 Rating 2387.59
Round Color Result Opponent
A1 Black Win JPN Kon Akira 1938.42
A2 White Loss JPN Iwano Fumio 2075.72
A3 Black Win JPN Matsuoka Teruo 1950.80
A4 Black Win JPN Kise Katsumi 2448.79
A5 Black Win JPN Isobe Seiji 1955.25
8th Middle-dan Players Tournament
Date 2009-08-30 Rating 2399.85
Round Color Result Opponent
1 White Win JPN Yamamoto Yasuhiro 2098.82
2 White Win JPN Gakumazawa Hideaki 2005.88
3 Black Loss JPN Sato Kiyotomi 2323.63
4 White Win JPN Miyagawa Junzo 2130.85
5 White Draw JPN Maruyama Yasushi 2196.99
6 Black Win JPN Ono Takayuki 2306.12
46th Meijinsen Qualification East-Japan area 1st round
Date 2008-06-15 Rating 2413.02
Round Color Result Opponent
3 Black Win JPN Ono Takayuki 2305.90
4 Black Win JPN Kudomi Takahiro 2291.63
25th Kanto Shineisen Tournament
Date 2008-04-13 Rating 2411.70
Round Color Result Opponent
1 White Win JPN Fujikawa Masaki 2037.43
2 Black Win JPN Watanabe Tatsuya 2047.49
3 White Win JPN Tomobe Katsuhiro 2056.81
4 Black Win JPN Iwano Fumio 2180.80
5 Black Draw JPN Ono Takayuki 2306.54
2nd All Japan Championship (WC Qualification)
Date 2007-03-25 Rating 2392.52
Round Color Result Opponent
1 White Win JPN Kuramoto Hideharu 1912.53
2 Black Loss JPN Yamaguchi Yusui 2526.52
5 White Win JPN Tanno Yoshitaka 2046.84
6 Black Win JPN Ono Takayuki 2288.64