Maruta Koji (丸田光治)

Place: Tokyo, Japan

Rating: 2131.49, Std: 105.99, Rank: 551

First game: 1996-03-01, Last game: 2026-05-24

Top rating: 2231.78 (2003-11-16)

Games: 267, Wins: 103, Draws: 9, Losses: 155

Gy1: 5, Gy2: 17, Gy5: 50

64th Meijin-sen Tokyo area 1st round
Date	2026-05-24		Rating	2131.49
Round	Color	Result	Opponent
1	White	Loss	Ono Takayuki	2384.73
2	White	Loss	Tamura Kazumasa	2331.54
3	Black	Loss	Maruta Hiroki	2251.98
4	White	Draw	Kishimoto Shogo	2217.86
20th All Japan Championship
Date	2026-02-23		Rating	2137.89
Round	Color	Result	Opponent
1	Black	Loss	Kawamura Norihiko	2557.72
63rd Meijin-sen Tokyo area 1st round
Date	2025-06-28		Rating	2157.15
Round	Color	Result	Opponent
3	White	Win	Suzuki Yoshitaka	2021.04
4	White	Loss	Yoshikawa Tomoki	2391.11
19th All Japan Championship
Date	2025-06-28		Rating	2157.15
Round	Color	Result	Opponent
1	Black	Loss	Park Woong-bae	2447.00
2	White	Loss	Ishitani Shin-ichi	2367.20
3	White	Loss	Maruta Hiroki	2265.99
4	White	Win	Suzuki Yoshitaka	2021.04
5	Black	Loss	Kawamura Norihiko	2512.99
6	White	Win	Kawaai Hitoshi	2056.60
4th Masters Renju Tournament
Date	2025-03-23		Rating	2165.70
Round	Color	Result	Opponent
2	Black	Loss	Iwano Fumio	2194.17
3	White	Win	Maruyama Yasushi	2216.54
4	Black	Win	Yamamoto Yasuhiro	2161.06
5	White	Loss	Ishitani Shin-ichi	2386.17
41st Kanto Championship
Date	2024-07-21		Rating	2176.75
Round	Color	Result	Opponent
2	White	Win	Suzuki Yoshitaka	2004.70
3	White	Loss	Matsuda Shoma	2507.96
4	White	Loss	Takazawa Nagayoshi	2249.53
5	White	Win	Li Haoyang	2100.06
6	White	Loss	Tanaka Shotaro	2335.25
18th All Japan Championship
Date	2024-02-12		Rating	2186.64
Round	Color	Result	Opponent
1	White	Loss	Fujita Maiko	2421.22
2	Black	Win	Jang Eun-min	2345.38
3	White	Win	Ishitani Shin-ichi	2412.98
4	White	Loss	Park Woong-bae	2410.38
5	White	Win	Tanaka Shotaro	2326.70
6	White	Loss	Lee Ho June	2476.47
24 Kanto Renju Emperor Tournament Kanto area 1st round
Date	2023-11-19		Rating	2176.69
Round	Color	Result	Opponent
3	White	Loss	Tanaka Shotaro	2319.97
4	Black	Loss	Yoshikawa Tomoki	2199.87
40th Kanto Championship
Date	2023-07-09		Rating	2172.51
Round	Color	Result	Opponent
1	Black	Loss	Tanaka Shotaro	2327.25
4	White	Win	Suzuki Yoshitaka	1990.18
17th All Japan Championship
Date	2023-03-19		Rating	2169.38
Round	Color	Result	Opponent
5	White	Loss	Matsuda Shoma	2383.19
6	White	Loss	Takazawa Nagayoshi	2293.91
23 Kanto Renju Emperor Tournament 2nd round
Date	2023-01-29		Rating	2171.03
Round	Color	Result	Opponent
1	Black	Loss	Kamiya Shunsuke	2866.40
2	White	Loss	Fujita Maiko	2427.42
3	White	Loss	Yokoyama Shota	2460.72
4	White	Loss	Inoue Fumiya	2537.46
5	White	Loss	Okabe Hiroshi	2695.70
23 Renju Emperor Tournament Kanto area 1st round
Date	2022-11-06		Rating	2178.69
Round	Color	Result	Opponent
2	White	Win	Kasahara Reiko	1748.70
3	White	Win	Tomobe Katsuhiro	2118.56
4	Black	Win	Tanaka Shotaro	2330.22
39 Kanto Championship
Date	2022-07-31		Rating	2174.58
Round	Color	Result	Opponent
2	White	Win	Li Haoyang	2013.53
3	White	Loss	Ishitani Shin-ichi	2364.51
Special Tournament
Date	2022-04-10		Rating	2169.49
Round	Color	Result	Opponent
1	White	Loss	Fujita Maiko	2416.75
2	White	Loss	Inoue Fumiya	2516.34
3	White	Win	Maruta Hiroki	2221.45
38 Kanto Championship
Date	2021-08-08		Rating	2151.25
Round	Color	Result	Opponent
1	White	Loss	Inoue Fumiya	2507.88
2	White	Win	Kobayashi Nanako	2015.41
3	White	Win	Fujita Maiko	2356.98
16th All Japan Championship
Date	2021-03-28		Rating	2127.09
Round	Color	Result	Opponent
1	White	Loss	Makino Mitsunori	2567.89
2	White	Loss	Ishitani Shin-ichi	2353.94
3	White	Loss	Yoshimoto Yuta	2244.06
4	White	Loss	Kawaai Hitoshi	2017.07
5	White	Loss	Suenaga Daiki	2269.11
6	Black	Win	Maruta Hiroki	2234.98
24th New Year(Mikami)Cup
Date	2021-01-29		Rating	2122.56
Round	Color	Result	Opponent
S1	Black	Win	Maruta Hiroki	2233.33
S2	White	Loss	Makino Mitsunori	2561.49
S3	White	Loss	Okabe Hiroshi	2736.34
S4	Black	Loss	Ono Takayuki	2395.12
S5	White	Loss	Ishitani Shin-ichi	2369.33
21 Renju Emperor Tournament Kanto area 1st round
Date	2020-11-15		Rating	2115.16
Round	Color	Result	Opponent
1	White	Loss	Kawaai Hitoshi	2016.79
2	White	Loss	Suenaga Daiki	2273.75
3	White	Loss	Shimura Hiroki	2000.74
4	White	Win	Kasahara Reiko	1726.16
37 Kanto Championship
Date	2020-08-10		Rating	2121.63
Round	Color	Result	Opponent
3	White	Win	Okada Akihiro	1955.75
5	Black	Loss	Kato Yasuhiro	2083.41
6	Black	Win	Shimura Hiroki	1967.95
58 Meijinsen Qualification Kanto area 1st round
Date	2020-06-21		Rating	2124.87
Round	Color	Result	Opponent
1	White	Loss	Fujita Maiko	2373.87
2	White	Win	Ito Midori	1788.06
20 Renju Emperor Tournament Kanto area 1st round
Date	2019-11-10		Rating	2141.08
Round	Color	Result	Opponent
2	White	Win	Shibata Satoru	1829.12
3	White	Loss	Ishitani Shin-ichi	2378.35
4	White	Win	Tomobe Katsuhiro	2137.21
36 Kanto Championship
Date	2019-07-28		Rating	2143.61
Round	Color	Result	Opponent
5	White	Win	Shibata Satoru	1824.50
6	White	Loss	Miyamoto Syunju	2285.97
57 Meijinsen Qualification East Japan area 2nd round
Date	2019-06-23		Rating	2145.12
Round	Color	Result	Opponent
1	White	Loss	Kusajima Masato	2259.73
2	White	Loss	Koyama Jun	2613.14
3	Black	Win	Maruta Hiroki	2189.75
4	White	Loss	Ono Takayuki	2402.31
5	White	Draw	Inoue Fumiya	2429.14
57 Meijinsen Qualification Kanto area 1st round
Date	2019-05-12		Rating	2145.46
Round	Color	Result	Opponent
1	White	Win	Inoue Fumiya	2429.73
2	White	Win	Maruta Hiroki	2192.15
3	White	Loss	Ono Takayuki	2404.79
4	Black	Loss	Mitsumori Masao	2319.09
13 Middle-dan Players Tournament
Date	2018-08-12		Rating	2118.88
Round	Color	Result	Opponent
1	White	Loss	Kusajima Masato	2306.61
2	White	Loss	Miyamoto Syunju	2264.82
4	White	Loss	Kusajima Masato	2306.61
5	White	Loss	Miyamoto Syunju	2264.82
35 Kanto Championship
Date	2018-07-16		Rating	2119.58
Round	Color	Result	Opponent
1	Black	Loss	Nakayama Tomoharu	2840.39
56 Meijinsen Qualification Kanto area 1st round
Date	2018-05-13		Rating	2121.35
Round	Color	Result	Opponent
1	White	Loss	Sato Kiyotomi	2445.19
18 Kanto Renju Emperor Tournament 1st round
Date	2017-11-01		Rating	2129.56
Round	Color	Result	Opponent
1	White	Loss	Okabe Hiroshi	2724.32
2	Black	Win	Koyama Akihiro	1967.15
3	White	Loss	Ishitani Shin-ichi	2397.52
4	White	Loss	Maruta Hiroki	2146.32
34 Kanto Championship
Date	2017-07-16		Rating	2138.98
Round	Color	Result	Opponent
1	White	Win	Matsumoto Hiro	1729.23
2	Black	Loss	Ishitani Shin-ichi	2396.54
3	White	Loss	Ishima Ryoma	2164.90
12th All Japan Championship
Date	2017-03-26		Rating	2155.73
Round	Color	Result	Opponent
1	White	Draw	Iio Yoshihiro	2549.67
2	White	Loss	Tachi Masaya	2533.91
3	Black	Draw	Nishida Toshio	2093.62
4	Black	Loss	Ono Takayuki	2370.51
5	White	Win	Sakamoto Suzan	2274.87
6	White	Loss	Fujita Yudai	2490.96
17 Kanto Renju Emperor Tournament 2nd round
Date	2016-12-10		Rating	2165.35
Round	Color	Result	Opponent
1	Black	Loss	Nakayama Tomoharu	2787.06
2	White	Loss	Okabe Hiroshi	2718.45
3	Black	Loss	Sato Kiyotomi	2505.08
4	White	Loss	Ishitani Shin-ichi	2402.23
5	White	Loss	Nakamura Shigeru	2962.76
17 Kanto Renju Emperor Tournament 1st round
Date	2016-11-23		Rating	2167.66
Round	Color	Result	Opponent
1	White	Loss	Okabe Hiroshi	2717.12
2	Black	Win	Demachi Koichiro	1935.49
3	White	Loss	Sato Kiyotomi	2506.19
4	White	Win	Maruta Hiroki	2121.45
ex1	Black	Loss	Iwano Fumio	2273.05
33 Kanto Championship
Date	2016-07-31		Rating	2181.68
Round	Color	Result	Opponent
1	White	Win	Cho Enkun	1653.53
2	Black	Loss	Okabe Hiroshi	2725.67
3	White	Win	Kato Yasuhiro	2046.73
54 Meijinsen Qualification Kanto area 1st round
Date	2016-05-22		Rating	2187.74
Round	Color	Result	Opponent
2	Black	Loss	Sato Kiyotomi	2524.35
3	White	Win	Iwano Fumio	2245.48
4	Black	Loss	Mitsumori Masao	2357.92
11th All Japan Championship
Date	2016-01-11		Rating	2196.47
Round	Color	Result	Opponent
1	Black	Loss	Kamiya Shunsuke	2725.94
2	Black	Draw	Chigira Makoto	2031.89
3	White	Loss	Fujita Yudai	2450.13
5	White	Win	Kato Yasuhiro	2041.62
6	White	Win	Suzuki Rin	1925.54
Kanto Championship
Date	2015-07-20		Rating	2207.85
Round	Color	Result	Opponent
1	White	Loss	Nakayama Tomoharu	2766.48
4	White	Win	Hashimoto Takuya	2013.91
5	Black	Win	Kato Yasuhiro	2057.53
6	White	Win	Fujikawa Masaki	2110.61
10th All Japan Championship
Date	2015-03-29		Rating	2204.30
Round	Color	Result	Opponent
1	White	Loss	Kamiya Shunsuke	2678.64
2	White	Win	Fujikawa Masaki	2096.76
31th Kanto Championship
Date	2014-05-11		Rating	2183.85
Round	Color	Result	Opponent
2	White	Loss	Tamura Kazumasa	2514.14
3	White	Loss	Tomobe Katsuhiro	2115.03
4	White	Win	Maruta Hiroki	2105.74
11th Middle-dan players Tournament
Date	2013-08-17		Rating	2176.94
Round	Color	Result	Opponent
1	White	Loss	Kashihara Akihiko	2343.44
2	Black	Loss	Kato Yasuhiro	2135.79
3	White	Win	Maruta Hiroki	2139.04
4	White	Win	Kubo Izumi	2095.52
5	Black	Win	Miyagawa Junzo	2221.23
6	White	Loss	Nakayama Tomoharu	2653.31
51 Meijinsen Qualification East-Japan area 1st round
Date	2013-06-16		Rating	2171.90
Round	Color	Result	Opponent
1	White	Loss	Isobe Taizan	2394.50
29th Kanto Championship
Date	2013-05-12		Rating	2169.91
Round	Color	Result	Opponent
3	Black	Loss	Suzuki Rin	2050.80
4	White	Win	Nakamura Souta	2079.38
5	White	Win	Tada Ayako	2291.26
13 Kanto Renju Emperor Tournament 1st round
Date	2012-10-21		Rating	2149.86
Round	Color	Result	Opponent
1	White	Win	Higuchi Fumiya	1605.91
2	Black	Win	Mitsumori Masao	2349.45
3	White	Loss	Tada Ayako	2307.16
4	White	Loss	Ishitani Shin-ichi	2362.16
50 Meijinsen Qualification East-Japan area 1st round
Date	2012-06-03		Rating	2131.60
Round	Color	Result	Opponent
1	White	Loss	Mitsumori Masao	2366.61
2	White	Loss	Iwano Fumio	2135.29
3	White	Loss	Ono Takayuki	2432.53
4	Black	Win	Maruta Hiroki	2094.94
4th Tohoku Championship
Date	2012-04-08		Rating	2126.80
Round	Color	Result	Opponent
1	Black	Loss	Nakamura Shigeru	2883.32
2	White	Win	Maruta Hiroki	2087.24
3	White	Loss	Kobayashi Koichi	2225.62
4	White	Loss	Kusajima Masato	2183.32
5	White	Win	Hirono Masakazu	1998.04
12 Kanto Renju Emperor Tournament 1st round
Date	2011-10-23		Rating	2112.91
Round	Color	Result	Opponent
1	White	Loss	Kamiya Shunsuke	2443.98
49 Meijinsen Qualification East-Japan area 1st round
Date	2011-06-12		Rating	2103.84
Round	Color	Result	Opponent
1	White	Loss	Kamiya Shunsuke	2421.05
28th Kanto Championship
Date	2011-05-22		Rating	2102.73
Round	Color	Result	Opponent
1	White	Loss	Nakayama Tomoharu	2548.41
2	White	Loss	Arai Kazumi	2373.01
3	White	Loss	Suzuki Rin	1992.79
4	White	Win	Maruta Hiroki	2112.16
5	White	Loss	Fujikawa Masaki	2102.71
11 Kanto Renju Emperor Tournament 1st round
Date	2010-10-31		Rating	2111.96
Round	Color	Result	Opponent
1	Black	Win	Kato Yasuhiro	2070.11
2	White	Loss	Okabe Hiroshi	2698.04
Meijinsen Qualification East-Japan area 1st round
Date	2010-06-27		Rating	2112.00
Round	Color	Result	Opponent
1	White	Loss	Fukui Nobuhiro	2322.16
2	White	Win	Arai Kazumi	2318.70
3	White	Loss	Kudomi Takahiro	2399.03
4	Black	Loss	Tada Ayako	2195.33
27th Kanto Championship
Date	2010-05-23		Rating	2112.03
Round	Color	Result	Opponent
1	Black	Loss	Nakamura Shigeru	2859.56
2	White	Loss	Tomobe Katsuhiro	2209.81
5th All Japan Championship
Date	2010-03-21		Rating	2114.72
Round	Color	Result	Opponent
4	Black	Win	Kusajima Masato	2170.18
10 Kanto Renju Emperor Tournament 1st round
Date	2009-10-04		Rating	2111.10
Round	Color	Result	Opponent
1	White	Loss	Tanji Hiroki	2054.27
2	White	Loss	Tomobe Katsuhiro	2154.75
3	White	Win	Tanizaki Ryusuke	2105.67
4	Black	Win	Fujikawa Masaki	2051.38
26th Kanto Championship
Date	2009-05-17		Rating	2109.81
Round	Color	Result	Opponent
4	Black	Win	Matsuoka Teruo	1910.23
5	Black	Win	Kato Yasuhiro	2025.70
4th All Japan Championship
Date	2009-03-21		Rating	2105.35
Round	Color	Result	Opponent
4	White	Win	Suzuki Rin	1953.62
5	Black	Loss	Tanizaki Ryusuke	2127.14
6	Black	Loss	Nagao Noriaki	2273.39
9th Kanto Renju Emperor Tournament, 1st round
Date	2008-10-26		Rating	2101.21
Round	Color	Result	Opponent
1	White	Draw	Tamada Yoichi	2269.22
2	White	Win	Tada Ayako	2007.32
3	White	Loss	Ono Takayuki	2410.69
4	White	Loss	Nakayama Tomoharu	2286.95
25th Kanto Championship
Date	2008-05-18		Rating	2093.20
Round	Color	Result	Opponent
3	White	Win	Tanizaki Ryusuke	2121.68
4	Black	Win	Kobayashi Koichi	2099.33
5	Black	Loss	Kudomi Takahiro	2338.00
3rd All Japan Championship
Date	2008-03-23		Rating	2085.10
Round	Color	Result	Opponent
1	White	Loss	Yamaguchi Yusui	2614.38
2	White	Loss	Kato Yasuhiro	1986.71
3	White	Loss	Tadokoro Hosai	1927.48
4	White	Loss	Fujikawa Masaki	2107.38
5	White	Loss	Nakayama Tomoharu	2232.31
6	White	Draw	Tanizaki Ryusuke	2122.39
8 Kanto Renju Emperor Tournament 1st round
Date	2007-10-21		Rating	2098.94
Round	Color	Result	Opponent
1	White	Win	Takeuchi Shunsuke	1938.01
2	White	Win	Yamashita Daisuke	1903.77
3	White	Loss	Ishitani Shin-ichi	2399.41
4	White	Loss	Nakayama Tomoharu	2203.97
5	Black	Win	Matsuoka Teruo	1873.42
45th Meijinsen Qualification East-Japan area 1st round
Date	2007-06-17		Rating	2106.91
Round	Color	Result	Opponent
1	Black	Win	Tanizaki Ryusuke	2138.38
2	Black	Loss	Isobe Taizan	2434.26
3	White	Loss	Iwano Fumio	2165.41
4	White	Win	Hara Masao	2054.48
7th Kanto Renju Emperor Tournament - 1st round
Date	2006-10-15		Rating	2110.92
Round	Color	Result	Opponent
1	Black	Win	Matsuoka Teruo	1857.28
2	White	Loss	Maruta Hiroki	2010.27
3	Black	Win	Fujikawa Masaki	2055.56
4	Black	Loss	Hara Masao	2092.96
5	Black	Win	Tanizaki Ryusuke	2128.64
Meijin-sen Qual, East Japan area 1st round
Date	2006-06-18		Rating	2113.30
Round	Color	Result	Opponent
1	White	Loss	Koyama Jun	2339.17
2	Black	Loss	Arita Nobuyoshi	2369.24
3	White	Loss	Ono Takayuki	2301.68
4	Black	Loss	Hara Masao	2084.34
23rd Kanto Championship
Date	2006-05-21		Rating	2117.57
Round	Color	Result	Opponent
1	White	Win	Iwano Fumio	2095.82
2	Black	Loss	Mitsumori Masao	2259.17
3	Black	Win	Tadokoro Hosai	1935.24
4	Black	Loss	Nakamura Shigeru	2847.62
5	White	Loss	Hara Masao	2083.81
1st All Japan Championship
Date	2006-03-26		Rating	2127.00
Round	Color	Result	Opponent
4	White	Win	Tadokoro Hosai	1931.23
5	Black	Win	Kato Yasuhiro	2055.20
6	White	Win	Tomobe Katsuhiro	2091.08
6th Kanto Renju Emperor Tournament - 1st round
Date	2005-10-22		Rating	2134.32
Round	Color	Result	Opponent
1	Black	Win	Iwano Fumio	2071.79
2	White	Loss	Itami Yoshiyuki	2182.63
3	Black	Loss	Tomobe Katsuhiro	2081.02
4	White	Loss	Arita Nobuyoshi	2347.09
43rd Meijinsen Qualification: East Japan 1st round
Date	2005-06-12		Rating	2152.62
Round	Color	Result	Opponent
1	White	Loss	Koyama Jun	2279.64
2	White	Win	Tanno Yoshitaka	2094.31
3	White	Loss	Nagao Noriaki	2230.27
4	Black	Loss	Itami Yoshiyuki	2189.85
22nd Kanto Championship
Date	2005-05-22		Rating	2157.27
Round	Color	Result	Opponent
1	White	Win	Ishizaki Masatoshi	1916.07
2	Black	Loss	Kawamura Norihiko	2693.02
3	Black	Win	Sasaki Miyu	1965.55
4	White	Win	Koyama Jun	2276.91
5	White	Loss	Ishitani Shin-ichi	2397.94
Japan WC Qualification tournament
Date	2005-04-03		Rating	2163.38
Round	Color	Result	Opponent
4	White	Win	Tanizaki Ryusuke	2074.68
5	Black	Win	Kato Yasuhiro	2025.46
6	White	Loss	Kubo Izumi	2170.99
5th Kanto Renju Emperor Tournament - 1st round
Date	2004-11-28		Rating	2176.32
Round	Color	Result	Opponent
1	Black	Loss	Sato Koichi	2012.33
2	White	Win	Sasaki Miyu	1955.91
3	Black	Win	Maruta Hiroki	1958.72
4	White	Win	Matsuoka Teruo	1888.13
42nd Meijinsen Qualification: East Japan 1st round
Date	2004-06-13		Rating	2195.79
Round	Color	Result	Opponent
4	Black	Loss	Sano Hiroyuki	2166.38
4th Kanto Renju Emperor Tournament - 2nd round
Date	2003-11-30		Rating	2230.32
Round	Color	Result	Opponent
	White	Win	Nagao Noriaki	2282.52
	White	Win	Mitsumori Masao	2267.82
	Black	Loss	Isobe Taizan	2424.70
	Black	Loss	Yamaguchi Yusui	2595.51
	Black	Loss	Okabe Hiroshi	2559.71
4th Kanto Renju Emperor Tournament - 1st round
Date	2003-11-16		Rating	2231.78
Round	Color	Result	Opponent
1	Black	Win	Yamauchi Yasuhiro	1805.37
2	White	Win	Nagao Noriaki	2286.10
3	White	Draw	Yamaguchi Yusui	2593.78
4	White	Win	Kubo Izumi	2220.16
41th Meijinsen Qualification: East Japan 1st round
Date	2003-06-08		Rating	2221.29
Round	Color	Result	Opponent
1	White	Loss	Sano Hiroyuki	2210.88
2	White	Win	Mitsumori Masao	2294.01
3	White	Loss	Sato Kiyotomi	2299.77
4	Black	Draw	Kubo Izumi	2226.18
40th Meijinsen Qualification: East Japan 1st round
Date	2002-06-02		Rating	2209.23
Round	Color	Result	Opponent
1	White	Loss	Isobe Taizan	2449.95
2	Black	Loss	Kato Yasuhiro	2099.27
3	White	Win	Ohno Syunzo	1996.02
4	Black	Win	Sato Takuma	2070.57
38th Meijinsen Qualification: East Japan 1st round
Date	2000-06-04		Rating	2211.12
Round	Color	Result	Opponent
1	Black	Win	Sunagawa Shouki	2213.27
2	White	Win	Mitsumori Masao	2294.92
3	White	Loss	Kudomi Takahiro	2356.52
4	White	Loss	Isobe Taizan	2456.60
Kanto Championship
Date	2000-05-14		Rating	2209.72
Round	Color	Result	Opponent
1	White	Loss	Nakamura Shigeru	2763.51
2	White	Loss	Hara Masao	2121.88
3	Black	Win	Tadokoro Hosai	1974.01
4	Black	Win	Kato Yasuhiro	2055.59
36 Suiseisen Tournament 1st round
Date	1996-03-01		Rating	2135.86
Round	Color	Result	Opponent
4	White	Win	Tanuma Akira	1844.76