Maruta Koji (丸田光治)

Place: Tokyo, Japan

Rating: 2139.23, Std: 109.74, Rank: 549

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

Top rating: 2232.19 (2003-11-16)

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

Gy1: 5, Gy2: 17, Gy5: 47

64th Meijin-sen Tokyo area 1st round
Date	2026-05-24		Rating	2139.23
Round	Color	Result	Opponent
1	White	Loss	Ono Takayuki	2392.64
2	White	Loss	Tamura Kazumasa	2338.74
3	Black	Loss	Maruta Hiroki	2261.24
4	White	Draw	Kishimoto Shogo	2224.29
20th All Japan Championship
Date	2026-02-23		Rating	2145.63
Round	Color	Result	Opponent
1	Black	Loss	Kawamura Norihiko	2564.75
63rd Meijin-sen Tokyo area 1st round
Date	2025-06-28		Rating	2164.91
Round	Color	Result	Opponent
3	White	Win	Suzuki Yoshitaka	2045.86
4	White	Loss	Yoshikawa Tomoki	2397.21
19th All Japan Championship
Date	2025-06-28		Rating	2164.91
Round	Color	Result	Opponent
1	Black	Loss	Park Woong-bae	2449.84
2	White	Loss	Ishitani Shin-ichi	2374.15
3	White	Loss	Maruta Hiroki	2273.56
4	White	Win	Suzuki Yoshitaka	2045.86
5	Black	Loss	Kawamura Norihiko	2519.39
6	White	Win	Kawaai Hitoshi	2068.47
4th Masters Renju Tournament
Date	2025-03-23		Rating	2173.02
Round	Color	Result	Opponent
2	Black	Loss	Iwano Fumio	2199.56
3	White	Win	Maruyama Yasushi	2233.93
4	Black	Win	Yamamoto Yasuhiro	2158.33
5	White	Loss	Ishitani Shin-ichi	2392.47
41st Kanto Championship
Date	2024-07-21		Rating	2183.08
Round	Color	Result	Opponent
2	White	Win	Suzuki Yoshitaka	2016.84
3	White	Loss	Matsuda Shoma	2513.11
4	White	Loss	Takazawa Nagayoshi	2249.51
5	White	Win	Li Haoyang	2104.31
6	White	Loss	Tanaka Shotaro	2342.89
18th All Japan Championship
Date	2024-02-12		Rating	2192.39
Round	Color	Result	Opponent
1	White	Loss	Fujita Maiko	2425.79
2	Black	Win	Jang Eun-min	2354.43
3	White	Win	Ishitani Shin-ichi	2417.62
4	White	Loss	Park Woong-bae	2411.31
5	White	Win	Tanaka Shotaro	2332.97
6	White	Loss	Lee Ho June	2476.86
24 Kanto Renju Emperor Tournament Kanto area 1st round
Date	2023-11-19		Rating	2182.19
Round	Color	Result	Opponent
3	White	Loss	Tanaka Shotaro	2325.81
4	Black	Loss	Yoshikawa Tomoki	2204.91
40th Kanto Championship
Date	2023-07-09		Rating	2177.63
Round	Color	Result	Opponent
1	Black	Loss	Tanaka Shotaro	2332.45
4	White	Win	Suzuki Yoshitaka	1996.57
17th All Japan Championship
Date	2023-03-19		Rating	2174.17
Round	Color	Result	Opponent
5	White	Loss	Matsuda Shoma	2387.50
6	White	Loss	Takazawa Nagayoshi	2296.35
23 Kanto Renju Emperor Tournament 2nd round
Date	2023-01-29		Rating	2175.69
Round	Color	Result	Opponent
1	Black	Loss	Kamiya Shunsuke	2869.75
2	White	Loss	Fujita Maiko	2431.28
3	White	Loss	Yokoyama Shota	2465.13
4	White	Loss	Inoue Fumiya	2541.28
5	White	Loss	Okabe Hiroshi	2699.09
23 Renju Emperor Tournament Kanto area 1st round
Date	2022-11-06		Rating	2183.14
Round	Color	Result	Opponent
2	White	Win	Kasahara Reiko	1752.77
3	White	Win	Tomobe Katsuhiro	2122.58
4	Black	Win	Tanaka Shotaro	2334.51
39 Kanto Championship
Date	2022-07-31		Rating	2178.81
Round	Color	Result	Opponent
2	White	Win	Li Haoyang	2016.97
3	White	Loss	Ishitani Shin-ichi	2367.86
Special Tournament
Date	2022-04-10		Rating	2173.47
Round	Color	Result	Opponent
1	White	Loss	Fujita Maiko	2420.16
2	White	Loss	Inoue Fumiya	2519.80
3	White	Win	Maruta Hiroki	2225.10
38 Kanto Championship
Date	2021-08-08		Rating	2154.76
Round	Color	Result	Opponent
1	White	Loss	Inoue Fumiya	2511.00
2	White	Win	Kobayashi Nanako	2017.30
3	White	Win	Fujita Maiko	2359.96
16th All Japan Championship
Date	2021-03-28		Rating	2130.36
Round	Color	Result	Opponent
1	White	Loss	Makino Mitsunori	2571.01
2	White	Loss	Ishitani Shin-ichi	2356.58
3	White	Loss	Yoshimoto Yuta	2247.02
4	White	Loss	Kawaai Hitoshi	2020.18
5	White	Loss	Suenaga Daiki	2271.81
6	Black	Win	Maruta Hiroki	2238.06
24th New Year(Mikami)Cup
Date	2021-01-29		Rating	2125.76
Round	Color	Result	Opponent
S1	Black	Win	Maruta Hiroki	2236.33
S2	White	Loss	Makino Mitsunori	2564.51
S3	White	Loss	Okabe Hiroshi	2739.04
S4	Black	Loss	Ono Takayuki	2398.07
S5	White	Loss	Ishitani Shin-ichi	2371.91
21 Renju Emperor Tournament Kanto area 1st round
Date	2020-11-15		Rating	2118.27
Round	Color	Result	Opponent
1	White	Loss	Kawaai Hitoshi	2019.75
2	White	Loss	Suenaga Daiki	2276.25
3	White	Loss	Shimura Hiroki	2003.58
4	White	Win	Kasahara Reiko	1729.31
37 Kanto Championship
Date	2020-08-10		Rating	2124.62
Round	Color	Result	Opponent
3	White	Win	Okada Akihiro	1958.73
5	Black	Loss	Kato Yasuhiro	2086.24
6	Black	Win	Shimura Hiroki	1970.71
58 Meijinsen Qualification Kanto area 1st round
Date	2020-06-21		Rating	2127.81
Round	Color	Result	Opponent
1	White	Loss	Fujita Maiko	2376.49
2	White	Win	Ito Midori	1791.30
20 Renju Emperor Tournament Kanto area 1st round
Date	2019-11-10		Rating	2143.77
Round	Color	Result	Opponent
2	White	Win	Shibata Satoru	1831.52
3	White	Loss	Ishitani Shin-ichi	2380.59
4	White	Win	Tomobe Katsuhiro	2139.70
36 Kanto Championship
Date	2019-07-28		Rating	2146.20
Round	Color	Result	Opponent
5	White	Win	Shibata Satoru	1826.88
6	White	Loss	Miyamoto Syunju	2289.62
57 Meijinsen Qualification East Japan area 2nd round
Date	2019-06-23		Rating	2147.66
Round	Color	Result	Opponent
1	White	Loss	Kusajima Masato	2263.31
2	White	Loss	Koyama Jun	2614.89
3	Black	Win	Maruta Hiroki	2192.14
4	White	Loss	Ono Takayuki	2404.62
5	White	Draw	Inoue Fumiya	2431.31
57 Meijinsen Qualification Kanto area 1st round
Date	2019-05-12		Rating	2147.96
Round	Color	Result	Opponent
1	White	Win	Inoue Fumiya	2431.87
2	White	Win	Maruta Hiroki	2194.50
3	White	Loss	Ono Takayuki	2407.06
4	Black	Loss	Mitsumori Masao	2320.83
13 Middle-dan Players Tournament
Date	2018-08-12		Rating	2121.11
Round	Color	Result	Opponent
1	White	Loss	Kusajima Masato	2309.40
2	White	Loss	Miyamoto Syunju	2267.60
4	White	Loss	Kusajima Masato	2309.40
5	White	Loss	Miyamoto Syunju	2267.60
35 Kanto Championship
Date	2018-07-16		Rating	2121.78
Round	Color	Result	Opponent
1	Black	Loss	Nakayama Tomoharu	2841.87
56 Meijinsen Qualification Kanto area 1st round
Date	2018-05-13		Rating	2123.47
Round	Color	Result	Opponent
1	White	Loss	Sato Kiyotomi	2446.87
18 Kanto Renju Emperor Tournament 1st round
Date	2017-11-01		Rating	2131.45
Round	Color	Result	Opponent
1	White	Loss	Okabe Hiroshi	2725.71
2	Black	Win	Koyama Akihiro	1968.61
3	White	Loss	Ishitani Shin-ichi	2399.01
4	White	Loss	Maruta Hiroki	2148.08
34 Kanto Championship
Date	2017-07-16		Rating	2140.74
Round	Color	Result	Opponent
1	White	Win	Matsumoto Hiro	1730.19
2	Black	Loss	Ishitani Shin-ichi	2397.92
3	White	Loss	Ishima Ryoma	2166.12
12th All Japan Championship
Date	2017-03-26		Rating	2157.39
Round	Color	Result	Opponent
1	White	Draw	Iio Yoshihiro	2551.09
2	White	Loss	Tachi Masaya	2535.21
3	Black	Draw	Nishida Toshio	2095.03
4	Black	Loss	Ono Takayuki	2372.05
5	White	Win	Sakamoto Suzan	2276.43
6	White	Loss	Fujita Yudai	2492.16
17 Kanto Renju Emperor Tournament 2nd round
Date	2016-12-10		Rating	2166.93
Round	Color	Result	Opponent
1	Black	Loss	Nakayama Tomoharu	2788.27
2	White	Loss	Okabe Hiroshi	2719.72
3	Black	Loss	Sato Kiyotomi	2506.50
4	White	Loss	Ishitani Shin-ichi	2403.40
5	White	Loss	Nakamura Shigeru	2964.06
17 Kanto Renju Emperor Tournament 1st round
Date	2016-11-23		Rating	2169.22
Round	Color	Result	Opponent
1	White	Loss	Okabe Hiroshi	2718.38
2	Black	Win	Demachi Koichiro	1936.88
3	White	Loss	Sato Kiyotomi	2507.59
4	White	Win	Maruta Hiroki	2122.91
ex1	Black	Loss	Iwano Fumio	2274.52
33 Kanto Championship
Date	2016-07-31		Rating	2183.17
Round	Color	Result	Opponent
1	White	Win	Cho Enkun	1654.21
2	Black	Loss	Okabe Hiroshi	2726.89
3	White	Win	Kato Yasuhiro	2048.25
54 Meijinsen Qualification Kanto area 1st round
Date	2016-05-22		Rating	2189.18
Round	Color	Result	Opponent
2	Black	Loss	Sato Kiyotomi	2525.65
3	White	Win	Iwano Fumio	2246.84
4	Black	Loss	Mitsumori Masao	2359.24
11th All Japan Championship
Date	2016-01-11		Rating	2197.83
Round	Color	Result	Opponent
1	Black	Loss	Kamiya Shunsuke	2727.11
2	Black	Draw	Chigira Makoto	2033.19
3	White	Loss	Fujita Yudai	2451.09
5	White	Win	Kato Yasuhiro	2042.98
6	White	Win	Suzuki Rin	1926.52
Kanto Championship
Date	2015-07-20		Rating	2209.12
Round	Color	Result	Opponent
1	White	Loss	Nakayama Tomoharu	2767.33
4	White	Win	Hashimoto Takuya	2014.88
5	Black	Win	Kato Yasuhiro	2058.78
6	White	Win	Fujikawa Masaki	2111.81
10th All Japan Championship
Date	2015-03-29		Rating	2205.52
Round	Color	Result	Opponent
1	White	Loss	Kamiya Shunsuke	2679.71
2	White	Win	Fujikawa Masaki	2097.90
31th Kanto Championship
Date	2014-05-11		Rating	2184.94
Round	Color	Result	Opponent
2	White	Loss	Tamura Kazumasa	2515.53
3	White	Loss	Tomobe Katsuhiro	2116.04
4	White	Win	Maruta Hiroki	2106.72
11th Middle-dan players Tournament
Date	2013-08-17		Rating	2177.91
Round	Color	Result	Opponent
1	White	Loss	Kashihara Akihiko	2344.38
2	Black	Loss	Kato Yasuhiro	2136.71
3	White	Win	Maruta Hiroki	2139.94
4	White	Win	Kubo Izumi	2096.42
5	Black	Win	Miyagawa Junzo	2222.04
6	White	Loss	Nakayama Tomoharu	2654.19
51 Meijinsen Qualification East-Japan area 1st round
Date	2013-06-16		Rating	2172.85
Round	Color	Result	Opponent
1	White	Loss	Isobe Taizan	2395.34
29th Kanto Championship
Date	2013-05-12		Rating	2170.84
Round	Color	Result	Opponent
3	Black	Loss	Suzuki Rin	2051.65
4	White	Win	Nakamura Souta	2080.27
5	White	Win	Tada Ayako	2292.10
13 Kanto Renju Emperor Tournament 1st round
Date	2012-10-21		Rating	2150.73
Round	Color	Result	Opponent
1	White	Win	Higuchi Fumiya	1606.43
2	Black	Win	Mitsumori Masao	2350.26
3	White	Loss	Tada Ayako	2307.95
4	White	Loss	Ishitani Shin-ichi	2362.92
50 Meijinsen Qualification East-Japan area 1st round
Date	2012-06-03		Rating	2132.43
Round	Color	Result	Opponent
1	White	Loss	Mitsumori Masao	2367.38
2	White	Loss	Iwano Fumio	2136.06
3	White	Loss	Ono Takayuki	2433.22
4	Black	Win	Maruta Hiroki	2095.71
4th Tohoku Championship
Date	2012-04-08		Rating	2127.61
Round	Color	Result	Opponent
1	Black	Loss	Nakamura Shigeru	2884.08
2	White	Win	Maruta Hiroki	2088.00
3	White	Loss	Kobayashi Koichi	2226.41
4	White	Loss	Kusajima Masato	2184.31
5	White	Win	Hirono Masakazu	1999.00
12 Kanto Renju Emperor Tournament 1st round
Date	2011-10-23		Rating	2113.68
Round	Color	Result	Opponent
1	White	Loss	Kamiya Shunsuke	2444.53
49 Meijinsen Qualification East-Japan area 1st round
Date	2011-06-12		Rating	2104.56
Round	Color	Result	Opponent
1	White	Loss	Kamiya Shunsuke	2421.56
28th Kanto Championship
Date	2011-05-22		Rating	2103.45
Round	Color	Result	Opponent
1	White	Loss	Nakayama Tomoharu	2549.05
2	White	Loss	Arai Kazumi	2373.51
3	White	Loss	Suzuki Rin	1993.47
4	White	Win	Maruta Hiroki	2112.84
5	White	Loss	Fujikawa Masaki	2103.40
11 Kanto Renju Emperor Tournament 1st round
Date	2010-10-31		Rating	2112.64
Round	Color	Result	Opponent
1	Black	Win	Kato Yasuhiro	2070.75
2	White	Loss	Okabe Hiroshi	2698.63
Meijinsen Qualification East-Japan area 1st round
Date	2010-06-27		Rating	2112.65
Round	Color	Result	Opponent
1	White	Loss	Fukui Nobuhiro	2322.78
2	White	Win	Arai Kazumi	2319.24
3	White	Loss	Kudomi Takahiro	2399.66
4	Black	Loss	Tada Ayako	2195.94
27th Kanto Championship
Date	2010-05-23		Rating	2112.68
Round	Color	Result	Opponent
1	Black	Loss	Nakamura Shigeru	2860.15
2	White	Loss	Tomobe Katsuhiro	2210.41
5th All Japan Championship
Date	2010-03-21		Rating	2115.36
Round	Color	Result	Opponent
4	Black	Win	Kusajima Masato	2171.03
10 Kanto Renju Emperor Tournament 1st round
Date	2009-10-04		Rating	2111.70
Round	Color	Result	Opponent
1	White	Loss	Tanji Hiroki	2054.81
2	White	Loss	Tomobe Katsuhiro	2155.32
3	White	Win	Tanizaki Ryusuke	2106.26
4	Black	Win	Fujikawa Masaki	2051.95
26th Kanto Championship
Date	2009-05-17		Rating	2110.39
Round	Color	Result	Opponent
4	Black	Win	Matsuoka Teruo	1910.78
5	Black	Win	Kato Yasuhiro	2026.24
4th All Japan Championship
Date	2009-03-21		Rating	2105.92
Round	Color	Result	Opponent
4	White	Win	Suzuki Rin	1954.15
5	Black	Loss	Tanizaki Ryusuke	2127.70
6	Black	Loss	Nagao Noriaki	2273.93
9th Kanto Renju Emperor Tournament, 1st round
Date	2008-10-26		Rating	2101.75
Round	Color	Result	Opponent
1	White	Draw	Tamada Yoichi	2269.72
2	White	Win	Tada Ayako	2007.84
3	White	Loss	Ono Takayuki	2411.18
4	White	Loss	Nakayama Tomoharu	2287.41
25th Kanto Championship
Date	2008-05-18		Rating	2093.72
Round	Color	Result	Opponent
3	White	Win	Tanizaki Ryusuke	2122.20
4	Black	Win	Kobayashi Koichi	2099.85
5	Black	Loss	Kudomi Takahiro	2338.53
3rd All Japan Championship
Date	2008-03-23		Rating	2085.61
Round	Color	Result	Opponent
1	White	Loss	Yamaguchi Yusui	2614.89
2	White	Loss	Kato Yasuhiro	1987.21
3	White	Loss	Tadokoro Hosai	1927.97
4	White	Loss	Fujikawa Masaki	2107.88
5	White	Loss	Nakayama Tomoharu	2232.77
6	White	Draw	Tanizaki Ryusuke	2122.90
8 Kanto Renju Emperor Tournament 1st round
Date	2007-10-21		Rating	2099.43
Round	Color	Result	Opponent
1	White	Win	Takeuchi Shunsuke	1938.43
2	White	Win	Yamashita Daisuke	1904.09
3	White	Loss	Ishitani Shin-ichi	2399.89
4	White	Loss	Nakayama Tomoharu	2204.42
5	Black	Win	Matsuoka Teruo	1873.89
45th Meijinsen Qualification East-Japan area 1st round
Date	2007-06-17		Rating	2107.39
Round	Color	Result	Opponent
1	Black	Win	Tanizaki Ryusuke	2138.86
2	Black	Loss	Isobe Taizan	2434.75
3	White	Loss	Iwano Fumio	2165.88
4	White	Win	Hara Masao	2054.93
7th Kanto Renju Emperor Tournament - 1st round
Date	2006-10-15		Rating	2111.38
Round	Color	Result	Opponent
1	Black	Win	Matsuoka Teruo	1857.72
2	White	Loss	Maruta Hiroki	2010.70
3	Black	Win	Fujikawa Masaki	2056.01
4	Black	Loss	Hara Masao	2093.39
5	Black	Win	Tanizaki Ryusuke	2129.09
Meijin-sen Qual, East Japan area 1st round
Date	2006-06-18		Rating	2113.74
Round	Color	Result	Opponent
1	White	Loss	Koyama Jun	2339.61
2	Black	Loss	Arita Nobuyoshi	2369.69
3	White	Loss	Ono Takayuki	2302.13
4	Black	Loss	Hara Masao	2084.76
23rd Kanto Championship
Date	2006-05-21		Rating	2118.01
Round	Color	Result	Opponent
1	White	Win	Iwano Fumio	2096.25
2	Black	Loss	Mitsumori Masao	2259.62
3	Black	Win	Tadokoro Hosai	1935.67
4	Black	Loss	Nakamura Shigeru	2848.20
5	White	Loss	Hara Masao	2084.23
1st All Japan Championship
Date	2006-03-26		Rating	2127.44
Round	Color	Result	Opponent
4	White	Win	Tadokoro Hosai	1931.66
5	Black	Win	Kato Yasuhiro	2055.63
6	White	Win	Tomobe Katsuhiro	2091.51
6th Kanto Renju Emperor Tournament - 1st round
Date	2005-10-22		Rating	2134.74
Round	Color	Result	Opponent
1	Black	Win	Iwano Fumio	2072.19
2	White	Loss	Itami Yoshiyuki	2183.03
3	Black	Loss	Tomobe Katsuhiro	2081.44
4	White	Loss	Arita Nobuyoshi	2347.51
43rd Meijinsen Qualification: East Japan 1st round
Date	2005-06-12		Rating	2153.04
Round	Color	Result	Opponent
1	White	Loss	Koyama Jun	2280.04
2	White	Win	Tanno Yoshitaka	2094.69
3	White	Loss	Nagao Noriaki	2230.67
4	Black	Loss	Itami Yoshiyuki	2190.23
22nd Kanto Championship
Date	2005-05-22		Rating	2157.68
Round	Color	Result	Opponent
1	White	Win	Ishizaki Masatoshi	1916.42
2	Black	Loss	Kawamura Norihiko	2693.53
3	Black	Win	Sasaki Miyu	1965.91
4	White	Win	Koyama Jun	2277.31
5	White	Loss	Ishitani Shin-ichi	2398.45
Japan WC Qualification tournament
Date	2005-04-03		Rating	2163.79
Round	Color	Result	Opponent
4	White	Win	Tanizaki Ryusuke	2075.06
5	Black	Win	Kato Yasuhiro	2025.84
6	White	Loss	Kubo Izumi	2171.47
5th Kanto Renju Emperor Tournament - 1st round
Date	2004-11-28		Rating	2176.73
Round	Color	Result	Opponent
1	Black	Loss	Sato Koichi	2012.59
2	White	Win	Sasaki Miyu	1956.25
3	Black	Win	Maruta Hiroki	1959.08
4	White	Win	Matsuoka Teruo	1888.50
42nd Meijinsen Qualification: East Japan 1st round
Date	2004-06-13		Rating	2196.20
Round	Color	Result	Opponent
4	Black	Loss	Sano Hiroyuki	2166.61
4th Kanto Renju Emperor Tournament - 2nd round
Date	2003-11-30		Rating	2230.72
Round	Color	Result	Opponent
	White	Win	Nagao Noriaki	2282.82
	White	Win	Mitsumori Masao	2268.19
	Black	Loss	Isobe Taizan	2425.31
	Black	Loss	Yamaguchi Yusui	2596.08
	Black	Loss	Okabe Hiroshi	2560.19
4th Kanto Renju Emperor Tournament - 1st round
Date	2003-11-16		Rating	2232.19
Round	Color	Result	Opponent
1	Black	Win	Yamauchi Yasuhiro	1805.52
2	White	Win	Nagao Noriaki	2286.40
3	White	Draw	Yamaguchi Yusui	2594.36
4	White	Win	Kubo Izumi	2220.63
41th Meijinsen Qualification: East Japan 1st round
Date	2003-06-08		Rating	2221.70
Round	Color	Result	Opponent
1	White	Loss	Sano Hiroyuki	2211.14
2	White	Win	Mitsumori Masao	2294.35
3	White	Loss	Sato Kiyotomi	2300.17
4	Black	Draw	Kubo Izumi	2226.65
40th Meijinsen Qualification: East Japan 1st round
Date	2002-06-02		Rating	2209.64
Round	Color	Result	Opponent
1	White	Loss	Isobe Taizan	2450.76
2	Black	Loss	Kato Yasuhiro	2099.61
3	White	Win	Ohno Syunzo	1995.63
4	Black	Win	Sato Takuma	2070.87
38th Meijinsen Qualification: East Japan 1st round
Date	2000-06-04		Rating	2211.60
Round	Color	Result	Opponent
1	Black	Win	Sunagawa Shouki	2213.90
2	White	Win	Mitsumori Masao	2294.80
3	White	Loss	Kudomi Takahiro	2358.44
4	White	Loss	Isobe Taizan	2457.95
Kanto Championship
Date	2000-05-14		Rating	2210.20
Round	Color	Result	Opponent
1	White	Loss	Nakamura Shigeru	2764.31
2	White	Loss	Hara Masao	2122.42
3	Black	Win	Tadokoro Hosai	1974.22
4	Black	Win	Kato Yasuhiro	2055.93
36 Suiseisen Tournament 1st round
Date	1996-03-01		Rating	2136.19
Round	Color	Result	Opponent
4	White	Win	Tanuma Akira	1844.83