JPN Koyama Jun (小山純)

Place: Tokyo, Japan

Rating: 2529.66, Rank: 48

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

Top rating: 2560.64 (2015-11-15)

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

Gy1: 0, Gy2: 0, Gy5: 114

57 Meijinsen Tournament
Date 2019-09-16 Rating 2529.66
Round Color Result Opponent
1 Black Draw JPN Inoue Fumiya 2338.98
2 White Loss JPN Kamiya Shunsuke 2729.48
3 Black Loss JPN Kawamura Norihiko 2598.30
4 White Win JPN Matsuura Hiroshi 2305.64
5 Black Loss JPN Nakayama Tomoharu 2742.26
6 White Loss JPN Kawano Takahisa 2376.72
7 White Loss JPN Hasegawa Kazuto 2535.52
8 White Win JPN Okabe Hiroshi 2640.34
9 Black Win JPN Ishitani Shin-ichi 2316.89
World Championship AT
Date 2019-08-10 Rating 2533.01
Round Color Result Opponent
1 Black Draw CHN Mei Fan 2600.58
2 Black Win EST Oll Aivo 2666.09
3 Black Win JPN Inoue Fumiya 2342.19
4 Black Win RUS Epifanov Dmitry 2588.49
5 Black Loss JPN Nakayama Tomoharu 2738.22
6 Black Win JPN Okabe Hiroshi 2637.12
7 Black Draw JPN Kamiya Shunsuke 2727.81
8 Black Draw SWE Gardstrom Petter 2616.01
9 White Loss RUS Fedotov Denis 2594.57
10 White Loss CHN Cao Dong 2687.70
11 Black Loss RUS Sushkov Vladimir 2751.74
World Championship QT
Date 2019-08-02 Rating 2532.87
Round Color Result Opponent
1 White Win SWE Sandstrom Richard 2304.33
2 White Win CHN Li Xiaoqing 2578.00
3 Black Loss EST Mesila Villem 2577.37
4 Black Win MAC Wai Chan Keong 2693.37
5 Black Draw RUS Fedotov Denis 2596.18
6 White Loss SWE Gardstrom Petter 2617.01
7 White Win EST Topkin Georg-Romet 2530.66
57 Meijinsen Qualification East Japan area 2nd round
Date 2019-06-23 Rating 2528.40
Round Color Result Opponent
1 Black Win JPN Maruta Hiroki 2110.27
2 Black Win JPN Maruta Koji 2056.98
3 White Win JPN Inoue Fumiya 2345.15
4 Black Win JPN Kusajima Masato 2197.85
5 White Win JPN Ono Takayuki 2314.13
14th All Japan Championship
Date 2019-03-31 Rating 2514.29
Round Color Result Opponent
1 White Loss JPN Fujita Maiko 2218.79
2 Black Win JPN Chigira Makoto 2022.97
3 White Draw JPN Inoue Fumiya 2346.30
4 White Win JPN Ono Takayuki 2315.14
5 Black Loss JPN Nakamura Shigeru 2906.81
6 Black Loss JPN Okabe Hiroshi 2623.17
19 Renju Emperor Tournament Kanto area 1st round
Date 2018-10-21 Rating 2501.78
Round Color Result Opponent
1 Black Win JPN Demachi Koichiro 1875.79
2 White Loss JPN Iwano Fumio 2172.80
3 White Draw JPN Ishitani Shin-ichi 2351.47
4 White Loss JPN Inoue Fumiya 2331.77
56 Meijinsen Tournament
Date 2018-09-17 Rating 2503.62
Round Color Result Opponent
1 Black Win JPN Kuga Akio 2325.05
2 Black Loss JPN Matsuura Hiroshi 2295.00
3 White Win JPN Okabe Hiroshi 2624.71
5 Black Win JPN Kawamura Norihiko 2581.60
6 Black Loss JPN Ishitani Shin-ichi 2353.33
7 Black Loss JPN Kamiya Shunsuke 2713.54
8 White Loss JPN Nakamura Shigeru 2908.85
9 White Win JPN Hasegawa Kazuto 2512.60
35 Kanto Championship
Date 2018-07-16 Rating 2505.79
Round Color Result Opponent
4 Black Loss JPN Sato Kiyotomi 2375.08
5 White Win JPN Iwano Fumio 2177.34
6 White Win JPN Fujikawa Masaki 2053.03
56 Meijinsen Qualification East Japan area 2nd round
Date 2018-06-25 Rating 2507.26
Round Color Result Opponent
1 White Win JPN Kusajima Masato 2233.22
2 Black Win JPN Sato Kiyotomi 2375.54
3 White Loss JPN Ono Takayuki 2313.74
56 Meijinsen Qualification Kanto area 1st round
Date 2018-05-13 Rating 2511.11
Round Color Result Opponent
1 Black Loss JPN Mitsumori Masao 2262.48
2 Black Win JPN Iwano Fumio 2185.88
3 Black Win JPN Maruta Hiroki 2090.60
4 White Win JPN Sato Kiyotomi 2375.21
12th Team World Championship
Date 2018-05-05 Rating 2512.00
Round Color Result Opponent
1 Black Win EST Lillemaa Argo 2123.24
2 Black Win EST Purk Andry 2557.40
4 White Win RUS Kachaev Denis 2466.31
5 Black Win RUS Nikonov Konstantin 2610.89
6 Black Win CHN Liu Yang 2544.48
7 White Win RUS Lavrik-Karmazin Maksim 2409.04
8 White Draw RUS Artemyev Sergey 2488.80
9 Black Loss CHN Liu Yang 2544.48
10 White Loss EST Purk Andry 2557.40
13th All Japan Championship
Date 2018-01-28 Rating 2510.34
Round Color Result Opponent
1 White Loss JPN Ono Takayuki 2309.36
2 White Loss JPN Ishitani Shin-ichi 2344.59
3 White Loss JPN Miyamoto Syunju 2200.48
5 White Win JPN Sato Kiyotomi 2369.94
6 Black Win JPN Maruta Hiroki 2085.38
18 Kanto Renju Emperor Tournament 2nd round
Date 2017-12-31 Rating 2513.92
Round Color Result Opponent
1 Black Draw JPN Sato Kiyotomi 2371.53
2 Black Win JPN Miyamoto Syunju 2202.78
3 Black Loss JPN Nakamura Shigeru 2881.05
4 Black Loss JPN Okabe Hiroshi 2639.29
5 White Win JPN Kusajima Masato 2231.01
18 Kanto Renju Emperor Tournament 1st round
Date 2017-11-30 Rating 2518.62
Round Color Result Opponent
1 Black Win JPN Koyama Akihiro 1912.52
2 White Draw JPN Okabe Hiroshi 2640.36
3 Black Win JPN Ono Takayuki 2306.81
4 White Win JPN Kusajima Masato 2229.19
World Championship BT
Date 2017-08-12 Rating 2530.53
Round Color Result Opponent
1 Black Win EST Rahumagi Brenet 2257.08
2 Black Win MAC Sun In 2367.34
3 Black Draw CHN Liu Yang 2577.41
4 Black Win CHN Lan Zhiren 2559.86
5 Black Win TPE Yang Yu-Hsiung 2369.75
6 Black Loss MAC Tang Kai Lam 2689.23
7 Black Win EST Topkin Georg-Romet 2432.48
8 White Win TPE Huang Yen-Hua 2383.35
9 Black Loss JPN Okabe Hiroshi 2641.56
World Championship QT
Date 2017-08-05 Rating 2530.58
Round Color Result Opponent
1 White Win EST Rahumagi Brenet 2257.02
2 White Win RUS Sushkov Vladimir 2796.45
3 Black Loss CHN Lan Zhiren 2559.29
4 Black Loss CHN Mei Fan 2609.08
5 White Draw JPN Okabe Hiroshi 2641.66
6 Black Win KOR Kim Su Chan 2255.68
7 Black Win TPE Lu Wei-Yuan 2528.66
55 Meijinsen Qualification East Japan area 2nd round
Date 2017-06-11 Rating 2526.96
Round Color Result Opponent
1 Black Win JPN Tomobe Katsuhiro 2103.90
2 White Loss JPN Tamada Yoichi 2464.84
3 White Loss JPN Ono Takayuki 2304.84
4 Black Win JPN Miyamoto Syunju 2195.91
5 Black Loss JPN Sato Kiyotomi 2401.42
12th All Japan Championship
Date 2017-03-26 Rating 2532.38
Round Color Result Opponent
1 Black Win JPN Kusajima Masato 2218.33
2 Black Loss JPN Nakamura Shigeru 2881.61
3 Black Win JPN Ishitani Shin-ichi 2326.55
4 Black Win JPN Nakayama Tomoharu 2718.26
5 Black Loss JPN Kamiya Shunsuke 2701.75
6 White Loss JPN Tachi Masaya 2466.32
20 New Year (Mikami) Cup
Date 2017-01-22 Rating 2536.20
Round Color Result Opponent
S2 Black Win JPN Sato Kiyotomi 2418.70
S3 Black Loss JPN Nakamura Shigeru 2880.01
S4 Black Win JPN Ishitani Shin-ichi 2325.98
S5 Black Loss JPN Okabe Hiroshi 2641.40
54 Meijinsen Tournament
Date 2016-09-19 Rating 2542.91
Round Color Result Opponent
1 White Win JPN Matsuura Hiroshi 2302.09
2 Black Loss JPN Kamiya Shunsuke 2677.53
3 White Draw JPN Hasegawa Kazuto 2563.36
4 White Draw JPN Iio Yoshihiro 2483.39
5 Black Win JPN Tanaka Toshiki 2385.24
6 Black Draw JPN Nakayama Tomoharu 2703.40
7 Black Draw JPN Maruyama Yasushi 2231.12
8 Black Win JPN Kuga Akio 2285.32
9 White Loss JPN Okabe Hiroshi 2642.05
33 Kanto Championship
Date 2016-07-31 Rating 2546.34
Round Color Result Opponent
1 White Win JPN Kato Yasuhiro 2004.75
2 Black Loss JPN Nakamura Shigeru 2872.14
3 Black Loss JPN Okabe Hiroshi 2645.80
4 Black Win JPN Nakamura Souta 2214.35
5 Black Draw JPN Nakayama Tomoharu 2701.63
6 Black Draw JPN Ishitani Shin-ichi 2323.71
54 Meijinsen Qualification East Japan area 2nd round
Date 2016-06-12 Rating 2551.14
Round Color Result Opponent
1 White Win JPN Kusajima Masato 2203.70
2 Black Win JPN Kamiya Shunsuke 2652.28
3 White Win JPN Tamada Yoichi 2491.48
4 Black Draw JPN Mitsumori Masao 2281.14
5 White Draw JPN Okabe Hiroshi 2648.25
19 Mikami Cup
Date 2016-03-13 Rating 2553.40
Round Color Result Opponent
S1 White Win JPN Ishitani Shin-ichi 2329.59
S2 Black Loss JPN Nakamura Shigeru 2860.91
S3 White Win JPN Kusajima Masato 2201.48
S4 Black Loss JPN Okabe Hiroshi 2647.15
16th Kanto Renju Emperor Tournament Final
Date 2016-02-14 Rating 2554.47
Round Color Result Opponent
1 Black Loss JPN Nakayama Tomoharu 2700.40
2 White Loss JPN Nakayama Tomoharu 2700.40
11th All Japan Championship
Date 2016-01-11 Rating 2557.29
Round Color Result Opponent
1 White Win JPN Maruta Hiroki 2061.67
2 Black Win JPN Nakamura Souta 2231.99
3 Black Win JPN Okabe Hiroshi 2644.95
4 Black Loss JPN Nakayama Tomoharu 2698.63
5 White Loss JPN Sato Kiyotomi 2449.93
6 White Draw JPN Tamada Yoichi 2496.21
16 Kanto Renju Emperor Tournament 2nd round
Date 2015-12-13 Rating 2560.20
Round Color Result Opponent
1 White Win JPN Sato Kiyotomi 2449.27
2 White Win JPN Ono Takayuki 2268.40
3 Black Loss JPN Okabe Hiroshi 2645.34
4 Black Draw JPN Nakayama Tomoharu 2696.76
5 White Win JPN Nakamura Shigeru 2848.24
17 Kanto Renju Emperor Tournament 1st round
Date 2015-11-23 Rating 2560.50
Round Color Result Opponent
1 Black Win JPN Demachi Koichiro 1872.54
2 Black Loss JPN Okabe Hiroshi 2646.26
3 Black Win JPN Iwano Fumio 2194.59
4 White Win JPN Ishitani Shin-ichi 2334.44
16 Kanto Renju Emperor Tournament 1st round
Date 2015-11-15 Rating 2560.64
Round Color Result Opponent
1 Black Win JPN Ishitani Shin-ichi 2333.87
2 Black Win JPN Sato Kiyotomi 2446.99
3 Black Win JPN Okabe Hiroshi 2646.45
4 Black Win JPN Ono Takayuki 2269.01
53 Meijinsen Tournament
Date 2015-09-22 Rating 2556.26
Round Color Result Opponent
1 Black Loss JPN Hasegawa Kazuto 2589.48
2 Black Win JPN Oosumi Yuuki 2702.13
3 White Win JPN Ishitani Shin-ichi 2332.66
4 Black Draw JPN Nakayama Tomoharu 2690.18
5 White Loss JPN Kawamura Norihiko 2553.84
6 White Loss JPN Tamada Yoichi 2504.16
7 Black Draw JPN Iio Yoshihiro 2462.09
8 White Win JPN Matsuura Hiroshi 2333.60
9 Black Draw JPN Okabe Hiroshi 2648.24
World Championship BT
Date 2015-08-12 Rating 2553.59
Round Color Result Opponent
1 White Win CHN Huang Xiuyi 2124.39
2 Black Loss JPN Miyagawa Junzo 2178.06
3 Black Win EST Topkin Georg-Romet 2265.81
4 Black Win TPE Wang Chih-Kung 2276.87
5 Black Loss RUS Sirategyan Karen 2361.13
6 Black Win JPN Ishitani Shin-ichi 2334.75
7 Black Win RUS Lavrik-Karmazin Maksim 2215.57
8 White Win JPN Mano Yoshihisa 2295.01
9 White Draw JPN Nakayama Tomoharu 2686.46
World Championship QT
Date 2015-08-05 Rating 2553.41
Round Color Result Opponent
1 Black Win EST Topkin Georg-Romet 2264.51
2 Black Win JPN Nakayama Tomoharu 2685.31
3 Black Loss JPN Kamiya Shunsuke 2626.30
4 White Draw CHN Wang Qingqing 2562.64
5 Black Win TPE Huang Yen-Hua 2395.24
6 Black Loss RUS Epifanov Dmitry 2629.35
7 Black Win TPE Lin Liu-Min 2495.80
Kanto Championship
Date 2015-07-20 Rating 2552.08
Round Color Result Opponent
1 White Win JPN Maruta Hiroki 2047.66
2 Black Win JPN Nakamura Shigeru 2834.04
3 Black Draw JPN Okabe Hiroshi 2654.88
4 White Win JPN Iwano Fumio 2195.73
5 Black Loss JPN Nakayama Tomoharu 2684.27
6 Black Win CHN Zhao Jiadong 2073.73
53 Meijinsen Qualification East Japan area 2nd round
Date 2015-06-14 Rating 2546.73
Round Color Result Opponent
1 White Loss JPN Tamada Yoichi 2509.63
2 Black Win JPN Sato Kiyotomi 2428.64
3 White Win JPN Ono Takayuki 2268.56
5 Black Draw JPN Kamiya Shunsuke 2615.06
6 White Win JPN Nakamura Souta 2223.57
53 Meijinsen Qualification East Japan area 1st round
Date 2015-05-10 Rating 2541.05
Round Color Result Opponent
1 Black Win JPN Mitsumori Masao 2264.64
2 Black Win JPN Iwano Fumio 2190.83
3 Black Win JPN Nakamura Souta 2221.76
4 White Loss JPN Kamiya Shunsuke 2609.52
10th All Japan Championship
Date 2015-03-29 Rating 2534.17
Round Color Result Opponent
1 White Win JPN Fujikawa Masaki 2045.92
2 White Loss JPN Kamiya Shunsuke 2600.13
3 Black Win JPN Kato Yasuhiro 2015.16
4 Black Win JPN Mitsumori Masao 2263.84
5 Black Loss JPN Ishitani Shin-ichi 2357.46
6 Black Win JPN Tanizaki Ryusuke 2146.99
12 Kanto Renju Emperor Tournament 1st round
Date 2011-10-23 Rating 2400.12
Round Color Result Opponent
1 Black Loss JPN Oosumi Yuuki 2695.42
2 White Win JPN Suzuki Rin 1942.78
3 White Loss JPN Isobe Taizan 2355.30
4 White Loss JPN Fukui Nobuhiro 2400.87
49 Meijinsen Qualification East-Japan area 1st round
Date 2011-06-12 Rating 2397.26
Round Color Result Opponent
1 Black Loss JPN Isobe Taizan 2346.31
2 Black Win JPN Kudomi Takahiro 2335.88
3 Black Loss JPN Nakayama Tomoharu 2490.34
4 Black Win JPN Ono Takayuki 2336.50
ex Black Loss JPN Nakayama Tomoharu 2490.34
28th Kanto Shineisen Tournament
Date 2011-04-17 Rating 2398.07
Round Color Result Opponent
1 White Win JPN Kon Akira 1953.56
2 Black Win JPN Kamiya Shunsuke 2379.13
3 White Win JPN Ozawa Tetsushi 2033.95
4 White Loss JPN Nakayama Tomoharu 2481.12
5 Black Win JPN Tomobe Katsuhiro 2166.77
5 White Loss JPN Kamiya Shunsuke 2379.13
14th Mikami Cup Tournament
Date 2011-01-30 Rating 2399.46
Round Color Result Opponent
A1 Black Win JPN Kon Akira 1948.86
A2 White Loss JPN Iwano Fumio 2086.25
A3 Black Win JPN Matsuoka Teruo 1960.66
A4 Black Win JPN Kise Katsumi 2461.40
A5 Black Win JPN Isobe Seiji 1963.66
8th Middle-dan Players Tournament
Date 2009-08-30 Rating 2410.79
Round Color Result Opponent
1 White Win JPN Yamamoto Yasuhiro 2108.45
2 White Win JPN Gakumazawa Hideaki 2013.93
3 Black Loss JPN Sato Kiyotomi 2333.62
4 White Win JPN Miyagawa Junzo 2141.39
5 White Draw JPN Maruyama Yasushi 2206.85
6 Black Win JPN Ono Takayuki 2316.89
46th Meijinsen Qualification East-Japan area 1st round
Date 2008-06-15 Rating 2423.34
Round Color Result Opponent
3 Black Win JPN Ono Takayuki 2316.22
4 Black Win JPN Kudomi Takahiro 2301.68
25th Kanto Shineisen Tournament
Date 2008-04-13 Rating 2421.94
Round Color Result Opponent
1 White Win JPN Fujikawa Masaki 2046.17
2 Black Win JPN Watanabe Tatsuya 2055.19
3 White Win JPN Tomobe Katsuhiro 2065.55
4 Black Win JPN Iwano Fumio 2190.00
5 Black Draw JPN Ono Takayuki 2316.71
2nd All Japan Championship (WC Qualification)
Date 2007-03-25 Rating 2402.35
Round Color Result Opponent
1 White Win JPN Kuramoto Hideharu 1919.87
2 Black Loss JPN Yamaguchi Yusui 2531.45
5 White Win JPN Tanno Yoshitaka 2054.19
6 Black Win JPN Ono Takayuki 2298.38