Maruta Koji (丸田光治)

Place: Tokyo, Japan

Rating: 2183.38, Std: 96.39, Rank: 463

First game: 1996-03-01, Last game: 2025-06-28

Top rating: 2231.36 (2003-11-16)

Games: 262, Wins: 103, Draws: 8, Losses: 151

Gy1: 12, Gy2: 25, Gy5: 60

63rd Meijin-sen Tokyo area 1st round
Date	2025-06-28		Rating	2183.38
Round	Color	Result	Opponent
3	White	Win	Suzuki Yoshitaka	2028.83
4	White	Loss	Yoshikawa Tomoki	2324.05
19th All Japan Championship
Date	2025-06-28		Rating	2183.38
Round	Color	Result	Opponent
1	Black	Loss	Park Woong-bae	2448.40
2	White	Loss	Ishitani Shin-ichi	2377.14
3	White	Loss	Maruta Hiroki	2279.26
4	White	Win	Suzuki Yoshitaka	2028.83
5	Black	Loss	Kawamura Norihiko	2461.57
6	White	Win	Kawaai Hitoshi	2065.72
4th Masters Renju Tournament
Date	2025-03-23		Rating	2187.12
Round	Color	Result	Opponent
2	Black	Loss	Iwano Fumio	2190.51
3	White	Win	Maruyama Yasushi	2195.45
4	Black	Win	Yamamoto Yasuhiro	2175.70
5	White	Loss	Ishitani Shin-ichi	2393.19
41st Kanto Championship
Date	2024-07-21		Rating	2189.33
Round	Color	Result	Opponent
2	White	Win	Suzuki Yoshitaka	2005.42
3	White	Loss	Matsuda Shoma	2505.76
4	White	Loss	Takazawa Nagayoshi	2233.39
5	White	Win	Li Haoyang	2096.95
6	White	Loss	Tanaka Shotaro	2330.34
18th All Japan Championship
Date	2024-02-12		Rating	2195.32
Round	Color	Result	Opponent
1	White	Loss	Fujita Maiko	2416.62
2	Black	Win	Jang Eun Min	2350.13
3	White	Win	Ishitani Shin-ichi	2412.35
4	White	Loss	Park Woong-bae	2406.43
5	White	Win	Tanaka Shotaro	2323.61
6	White	Loss	Lee Ho June	2469.08
24 Kanto Renju Emperor Tournament Kanto area 1st round
Date	2023-11-19		Rating	2183.92
Round	Color	Result	Opponent
3	White	Loss	Tanaka Shotaro	2317.63
4	Black	Loss	Yoshikawa Tomoki	2188.62
40th Kanto Championship
Date	2023-07-09		Rating	2178.05
Round	Color	Result	Opponent
1	Black	Loss	Tanaka Shotaro	2325.35
4	White	Win	Suzuki Yoshitaka	1988.60
17th All Japan Championship
Date	2023-03-19		Rating	2173.70
Round	Color	Result	Opponent
5	White	Loss	Matsuda Shoma	2381.33
6	White	Loss	Takazawa Nagayoshi	2288.29
23 Kanto Renju Emperor Tournament 2nd round
Date	2023-01-29		Rating	2174.92
Round	Color	Result	Opponent
1	Black	Loss	Kamiya Shunsuke	2859.25
2	White	Loss	Fujita Maiko	2425.64
3	White	Loss	Yokoyama Shota	2472.22
4	White	Loss	Inoue Fumiya	2534.27
5	White	Loss	Okabe Hiroshi	2693.81
23 Renju Emperor Tournament Kanto area 1st round
Date	2022-11-06		Rating	2181.90
Round	Color	Result	Opponent
2	White	Win	Kasahara Reiko	1748.80
3	White	Win	Tomobe Katsuhiro	2115.66
4	Black	Win	Tanaka Shotaro	2328.91
39 Kanto Championship
Date	2022-07-31		Rating	2177.16
Round	Color	Result	Opponent
2	White	Win	Li Haoyang	2012.81
3	White	Loss	Ishitani Shin-ichi	2362.72
Special Tournament
Date	2022-04-10		Rating	2171.46
Round	Color	Result	Opponent
1	White	Loss	Fujita Maiko	2414.98
2	White	Loss	Inoue Fumiya	2514.63
3	White	Win	Maruta Hiroki	2220.64
38 Kanto Championship
Date	2021-08-08		Rating	2152.15
Round	Color	Result	Opponent
1	White	Loss	Inoue Fumiya	2506.58
2	White	Win	Kobayashi Nanako	2014.30
3	White	Win	Fujita Maiko	2355.29
16th All Japan Championship
Date	2021-03-28		Rating	2127.49
Round	Color	Result	Opponent
1	White	Loss	Makino Mitsunori	2567.39
2	White	Loss	Ishitani Shin-ichi	2352.44
3	White	Loss	Yoshimoto Yuta	2242.92
4	White	Loss	Kawaai Hitoshi	2016.78
5	White	Loss	Suenaga Daiki	2267.64
6	Black	Win	Maruta Hiroki	2234.03
24th New Year(Mikami)Cup
Date	2021-01-29		Rating	2122.81
Round	Color	Result	Opponent
S1	Black	Win	Maruta Hiroki	2232.37
S2	White	Loss	Makino Mitsunori	2560.86
S3	White	Loss	Okabe Hiroshi	2736.37
S4	Black	Loss	Ono Takayuki	2394.11
S5	White	Loss	Ishitani Shin-ichi	2367.95
21 Renju Emperor Tournament Kanto area 1st round
Date	2020-11-15		Rating	2115.25
Round	Color	Result	Opponent
1	White	Loss	Kawaai Hitoshi	2016.58
2	White	Loss	Suenaga Daiki	2272.38
3	White	Loss	Shimura Hiroki	1999.70
4	White	Win	Kasahara Reiko	1725.62
37 Kanto Championship
Date	2020-08-10		Rating	2121.55
Round	Color	Result	Opponent
3	White	Win	Okada Akihiro	1944.95
5	Black	Loss	Kato Yasuhiro	2090.16
6	Black	Win	Shimura Hiroki	1967.05
58 Meijinsen Qualification Kanto area 1st round
Date	2020-06-21		Rating	2124.73
Round	Color	Result	Opponent
1	White	Loss	Fujita Maiko	2372.47
2	White	Win	Ito Midori	1786.65
20 Renju Emperor Tournament Kanto area 1st round
Date	2019-11-10		Rating	2140.67
Round	Color	Result	Opponent
2	White	Win	Shibata Satoru	1828.35
3	White	Loss	Ishitani Shin-ichi	2377.25
4	White	Win	Tomobe Katsuhiro	2135.79
36 Kanto Championship
Date	2019-07-28		Rating	2143.12
Round	Color	Result	Opponent
5	White	Win	Shibata Satoru	1823.74
6	White	Loss	Miyamoto Syunju	2286.64
57 Meijinsen Qualification East Japan area 2nd round
Date	2019-06-23		Rating	2144.59
Round	Color	Result	Opponent
1	White	Loss	Kusajima Masato	2260.14
2	White	Loss	Koyama Jun	2608.17
3	Black	Win	Maruta Hiroki	2188.68
4	White	Loss	Ono Takayuki	2401.00
5	White	Draw	Inoue Fumiya	2427.53
57 Meijinsen Qualification Kanto area 1st round
Date	2019-05-12		Rating	2144.91
Round	Color	Result	Opponent
1	White	Win	Inoue Fumiya	2428.12
2	White	Win	Maruta Hiroki	2191.07
3	White	Loss	Ono Takayuki	2403.48
4	Black	Loss	Mitsumori Masao	2317.75
13 Middle-dan Players Tournament
Date	2018-08-12		Rating	2118.22
Round	Color	Result	Opponent
1	White	Loss	Kusajima Masato	2306.73
2	White	Loss	Miyamoto Syunju	2265.07
4	White	Loss	Kusajima Masato	2306.73
5	White	Loss	Miyamoto Syunju	2265.07
35 Kanto Championship
Date	2018-07-16		Rating	2118.90
Round	Color	Result	Opponent
1	Black	Loss	Nakayama Tomoharu	2838.22
56 Meijinsen Qualification Kanto area 1st round
Date	2018-05-13		Rating	2120.62
Round	Color	Result	Opponent
1	White	Loss	Sato Kiyotomi	2443.76
18 Kanto Renju Emperor Tournament 1st round
Date	2017-11-01		Rating	2128.69
Round	Color	Result	Opponent
1	White	Loss	Okabe Hiroshi	2722.55
2	Black	Win	Koyama Akihiro	1966.14
3	White	Loss	Ishitani Shin-ichi	2395.99
4	White	Loss	Maruta Hiroki	2145.12
34 Kanto Championship
Date	2017-07-16		Rating	2138.04
Round	Color	Result	Opponent
1	White	Win	Matsumoto Hiro	1728.56
2	Black	Loss	Ishitani Shin-ichi	2394.98
3	White	Loss	Ishima Ryoma	2163.98
12th All Japan Championship
Date	2017-03-26		Rating	2154.73
Round	Color	Result	Opponent
1	White	Draw	Iio Yoshihiro	2548.07
2	White	Loss	Tachi Masaya	2532.08
3	Black	Draw	Nishida Toshio	2091.94
4	Black	Loss	Ono Takayuki	2369.14
5	White	Win	Sakamoto Suzan	2273.22
6	White	Loss	Fujita Yudai	2489.35
17 Kanto Renju Emperor Tournament 2nd round
Date	2016-12-10		Rating	2164.33
Round	Color	Result	Opponent
1	Black	Loss	Nakayama Tomoharu	2785.27
2	White	Loss	Okabe Hiroshi	2716.77
3	Black	Loss	Sato Kiyotomi	2503.56
4	White	Loss	Ishitani Shin-ichi	2400.60
5	White	Loss	Nakamura Shigeru	2960.95
17 Kanto Renju Emperor Tournament 1st round
Date	2016-11-23		Rating	2166.63
Round	Color	Result	Opponent
1	White	Loss	Okabe Hiroshi	2715.44
2	Black	Win	Demachi Koichiro	1934.56
3	White	Loss	Sato Kiyotomi	2504.66
4	White	Win	Maruta Hiroki	2120.23
ex1	Black	Loss	Iwano Fumio	2271.81
33 Kanto Championship
Date	2016-07-31		Rating	2180.67
Round	Color	Result	Opponent
1	White	Win	Cho Enkun	1653.07
2	Black	Loss	Okabe Hiroshi	2724.02
3	White	Win	Kato Yasuhiro	2046.66
54 Meijinsen Qualification Kanto area 1st round
Date	2016-05-22		Rating	2186.72
Round	Color	Result	Opponent
2	Black	Loss	Sato Kiyotomi	2522.73
3	White	Win	Iwano Fumio	2244.27
4	Black	Loss	Mitsumori Masao	2356.54
11th All Japan Championship
Date	2016-01-11		Rating	2195.45
Round	Color	Result	Opponent
1	Black	Loss	Kamiya Shunsuke	2724.20
2	Black	Draw	Chigira Makoto	2030.88
3	White	Loss	Fujita Yudai	2448.51
5	White	Win	Kato Yasuhiro	2040.75
6	White	Win	Suzuki Rin	1924.44
Kanto Championship
Date	2015-07-20		Rating	2206.85
Round	Color	Result	Opponent
1	White	Loss	Nakayama Tomoharu	2764.91
4	White	Win	Hashimoto Takuya	2012.81
5	Black	Win	Kato Yasuhiro	2056.37
6	White	Win	Fujikawa Masaki	2108.86
10th All Japan Championship
Date	2015-03-29		Rating	2203.33
Round	Color	Result	Opponent
1	White	Loss	Kamiya Shunsuke	2677.01
2	White	Win	Fujikawa Masaki	2095.07
31th Kanto Championship
Date	2014-05-11		Rating	2183.01
Round	Color	Result	Opponent
2	White	Loss	Tamura Kazumasa	2523.27
3	White	Loss	Tomobe Katsuhiro	2113.85
4	White	Win	Maruta Hiroki	2104.63
11th Middle-dan players Tournament
Date	2013-08-17		Rating	2176.04
Round	Color	Result	Opponent
1	White	Loss	Kashihara Akihiko	2342.13
2	Black	Loss	Kato Yasuhiro	2134.65
3	White	Win	Maruta Hiroki	2137.98
4	White	Win	Kubo Izumi	2094.31
5	Black	Win	Miyagawa Junzo	2219.89
6	White	Loss	Nakayama Tomoharu	2652.17
51 Meijinsen Qualification East-Japan area 1st round
Date	2013-06-16		Rating	2171.01
Round	Color	Result	Opponent
1	White	Loss	Isobe Taizan	2393.49
29th Kanto Championship
Date	2013-05-12		Rating	2169.01
Round	Color	Result	Opponent
3	Black	Loss	Suzuki Rin	2049.88
4	White	Win	Nakamura Souta	2078.28
5	White	Win	Tada Ayako	2290.17
13 Kanto Renju Emperor Tournament 1st round
Date	2012-10-21		Rating	2148.99
Round	Color	Result	Opponent
1	White	Win	Higuchi Fumiya	1605.29
2	Black	Win	Mitsumori Masao	2348.24
3	White	Loss	Tada Ayako	2306.10
4	White	Loss	Ishitani Shin-ichi	2360.95
50 Meijinsen Qualification East-Japan area 1st round
Date	2012-06-03		Rating	2130.75
Round	Color	Result	Opponent
1	White	Loss	Mitsumori Masao	2365.45
2	White	Loss	Iwano Fumio	2134.30
3	White	Loss	Ono Takayuki	2431.45
4	Black	Win	Maruta Hiroki	2093.96
4th Tohoku Championship
Date	2012-04-08		Rating	2125.96
Round	Color	Result	Opponent
1	Black	Loss	Nakamura Shigeru	2882.08
2	White	Win	Maruta Hiroki	2086.29
3	White	Loss	Kobayashi Koichi	2224.71
4	White	Loss	Kusajima Masato	2182.74
5	White	Win	Hirono Masakazu	1999.03
12 Kanto Renju Emperor Tournament 1st round
Date	2011-10-23		Rating	2112.08
Round	Color	Result	Opponent
1	White	Loss	Kamiya Shunsuke	2442.70
49 Meijinsen Qualification East-Japan area 1st round
Date	2011-06-12		Rating	2103.01
Round	Color	Result	Opponent
1	White	Loss	Kamiya Shunsuke	2419.79
28th Kanto Championship
Date	2011-05-22		Rating	2101.90
Round	Color	Result	Opponent
1	White	Loss	Nakayama Tomoharu	2547.33
2	White	Loss	Arai Kazumi	2372.02
3	White	Loss	Suzuki Rin	1991.94
4	White	Win	Maruta Hiroki	2111.27
5	White	Loss	Fujikawa Masaki	2101.78
11 Kanto Renju Emperor Tournament 1st round
Date	2010-10-31		Rating	2111.16
Round	Color	Result	Opponent
1	Black	Win	Kato Yasuhiro	2069.28
2	White	Loss	Okabe Hiroshi	2696.96
Meijinsen Qualification East-Japan area 1st round
Date	2010-06-27		Rating	2111.22
Round	Color	Result	Opponent
1	White	Loss	Fukui Nobuhiro	2321.28
2	White	Win	Arai Kazumi	2317.80
3	White	Loss	Kudomi Takahiro	2398.12
4	Black	Loss	Tada Ayako	2194.51
27th Kanto Championship
Date	2010-05-23		Rating	2111.26
Round	Color	Result	Opponent
1	Black	Loss	Nakamura Shigeru	2858.54
2	White	Loss	Tomobe Katsuhiro	2208.99
5th All Japan Championship
Date	2010-03-21		Rating	2113.97
Round	Color	Result	Opponent
4	Black	Win	Kusajima Masato	2169.55
10 Kanto Renju Emperor Tournament 1st round
Date	2009-10-04		Rating	2110.37
Round	Color	Result	Opponent
1	White	Loss	Tanji Hiroki	2053.60
2	White	Loss	Tomobe Katsuhiro	2154.01
3	White	Win	Tanizaki Ryusuke	2104.94
4	Black	Win	Fujikawa Masaki	2050.64
26th Kanto Championship
Date	2009-05-17		Rating	2109.11
Round	Color	Result	Opponent
4	Black	Win	Matsuoka Teruo	1909.56
5	Black	Win	Kato Yasuhiro	2025.02
4th All Japan Championship
Date	2009-03-21		Rating	2104.66
Round	Color	Result	Opponent
4	White	Win	Suzuki Rin	1952.94
5	Black	Loss	Tanizaki Ryusuke	2126.46
6	Black	Loss	Nagao Noriaki	2272.62
9th Kanto Renju Emperor Tournament, 1st round
Date	2008-10-26		Rating	2100.54
Round	Color	Result	Opponent
1	White	Draw	Tamada Yoichi	2268.52
2	White	Win	Tada Ayako	2006.65
3	White	Loss	Ono Takayuki	2409.96
4	White	Loss	Nakayama Tomoharu	2286.20
25th Kanto Championship
Date	2008-05-18		Rating	2092.56
Round	Color	Result	Opponent
3	White	Win	Tanizaki Ryusuke	2121.06
4	Black	Win	Kobayashi Koichi	2098.72
5	Black	Loss	Kudomi Takahiro	2337.32
3rd All Japan Championship
Date	2008-03-23		Rating	2084.47
Round	Color	Result	Opponent
1	White	Loss	Yamaguchi Yusui	2613.64
2	White	Loss	Kato Yasuhiro	1986.11
3	White	Loss	Tadokoro Hosai	1926.88
4	White	Loss	Fujikawa Masaki	2106.77
5	White	Loss	Nakayama Tomoharu	2231.62
6	White	Draw	Tanizaki Ryusuke	2121.78
8 Kanto Renju Emperor Tournament 1st round
Date	2007-10-21		Rating	2098.34
Round	Color	Result	Opponent
1	White	Win	Takeuchi Shunsuke	1937.50
2	White	Win	Yamashita Daisuke	1903.38
3	White	Loss	Ishitani Shin-ichi	2398.79
4	White	Loss	Nakayama Tomoharu	2203.31
5	Black	Win	Matsuoka Teruo	1872.85
45th Meijinsen Qualification East-Japan area 1st round
Date	2007-06-17		Rating	2106.33
Round	Color	Result	Opponent
1	Black	Win	Tanizaki Ryusuke	2137.82
2	Black	Loss	Isobe Taizan	2433.59
3	White	Loss	Iwano Fumio	2164.83
4	White	Win	Hara Masao	2053.92
7th Kanto Renju Emperor Tournament - 1st round
Date	2006-10-15		Rating	2110.38
Round	Color	Result	Opponent
1	Black	Win	Matsuoka Teruo	1856.77
2	White	Loss	Maruta Hiroki	2009.75
3	Black	Win	Fujikawa Masaki	2055.05
4	Black	Loss	Hara Masao	2092.44
5	Black	Win	Tanizaki Ryusuke	2128.10
Meijin-sen Qual, East Japan area 1st round
Date	2006-06-18		Rating	2112.77
Round	Color	Result	Opponent
1	White	Loss	Koyama Jun	2338.62
2	Black	Loss	Arita Nobuyoshi	2368.68
3	White	Loss	Ono Takayuki	2301.14
4	Black	Loss	Hara Masao	2083.83
23rd Kanto Championship
Date	2006-05-21		Rating	2117.05
Round	Color	Result	Opponent
1	White	Win	Iwano Fumio	2095.31
2	Black	Loss	Mitsumori Masao	2258.59
3	Black	Win	Tadokoro Hosai	1934.74
4	Black	Loss	Nakamura Shigeru	2847.01
5	White	Loss	Hara Masao	2083.31
1st All Japan Championship
Date	2006-03-26		Rating	2126.49
Round	Color	Result	Opponent
4	White	Win	Tadokoro Hosai	1930.75
5	Black	Win	Kato Yasuhiro	2054.71
6	White	Win	Tomobe Katsuhiro	2090.59
6th Kanto Renju Emperor Tournament - 1st round
Date	2005-10-22		Rating	2133.82
Round	Color	Result	Opponent
1	Black	Win	Iwano Fumio	2071.31
2	White	Loss	Itami Yoshiyuki	2182.16
3	Black	Loss	Tomobe Katsuhiro	2080.56
4	White	Loss	Arita Nobuyoshi	2346.57
43rd Meijinsen Qualification: East Japan 1st round
Date	2005-06-12		Rating	2152.14
Round	Color	Result	Opponent
1	White	Loss	Koyama Jun	2279.15
2	White	Win	Tanno Yoshitaka	2093.85
3	White	Loss	Nagao Noriaki	2229.78
4	Black	Loss	Itami Yoshiyuki	2189.39
22nd Kanto Championship
Date	2005-05-22		Rating	2156.79
Round	Color	Result	Opponent
1	White	Win	Ishizaki Masatoshi	1915.67
2	Black	Loss	Kawamura Norihiko	2692.51
3	Black	Win	Sasaki Miyu	1965.14
4	White	Win	Koyama Jun	2276.42
5	White	Loss	Ishitani Shin-ichi	2397.43
Japan WC Qualification tournament
Date	2005-04-03		Rating	2162.91
Round	Color	Result	Opponent
4	White	Win	Tanizaki Ryusuke	2074.22
5	Black	Win	Kato Yasuhiro	2025.01
6	White	Loss	Kubo Izumi	2170.56
5th Kanto Renju Emperor Tournament - 1st round
Date	2004-11-28		Rating	2175.87
Round	Color	Result	Opponent
1	Black	Loss	Sato Koichi	2011.98
2	White	Win	Sasaki Miyu	1955.52
3	Black	Win	Maruta Hiroki	1958.30
4	White	Win	Matsuoka Teruo	1887.70
42nd Meijinsen Qualification: East Japan 1st round
Date	2004-06-13		Rating	2195.35
Round	Color	Result	Opponent
4	Black	Loss	Sano Hiroyuki	2165.85
4th Kanto Renju Emperor Tournament - 2nd round
Date	2003-11-30		Rating	2229.89
Round	Color	Result	Opponent
	White	Win	Nagao Noriaki	2282.10
	White	Win	Mitsumori Masao	2267.37
	Black	Loss	Isobe Taizan	2424.25
	Black	Loss	Yamaguchi Yusui	2595.07
	Black	Loss	Okabe Hiroshi	2559.27
4th Kanto Renju Emperor Tournament - 1st round
Date	2003-11-16		Rating	2231.36
Round	Color	Result	Opponent
1	Black	Win	Yamauchi Yasuhiro	1805.19
2	White	Win	Nagao Noriaki	2285.68
3	White	Draw	Yamaguchi Yusui	2593.34
4	White	Win	Kubo Izumi	2219.74
41th Meijinsen Qualification: East Japan 1st round
Date	2003-06-08		Rating	2220.88
Round	Color	Result	Opponent
1	White	Loss	Sano Hiroyuki	2210.41
2	White	Win	Mitsumori Masao	2293.59
3	White	Loss	Sato Kiyotomi	2299.35
4	Black	Draw	Kubo Izumi	2225.78
40th Meijinsen Qualification: East Japan 1st round
Date	2002-06-02		Rating	2208.84
Round	Color	Result	Opponent
1	White	Loss	Isobe Taizan	2449.57
2	Black	Loss	Kato Yasuhiro	2098.91
3	White	Win	Ohno Syunzo	1995.58
4	Black	Win	Sato Takuma	2070.22
38th Meijinsen Qualification: East Japan 1st round
Date	2000-06-04		Rating	2210.80
Round	Color	Result	Opponent
1	Black	Win	Sunagawa Shouki	2212.94
2	White	Win	Mitsumori Masao	2294.64
3	White	Loss	Kudomi Takahiro	2356.19
4	White	Loss	Isobe Taizan	2456.32
Kanto Championship
Date	2000-05-14		Rating	2209.40
Round	Color	Result	Opponent
1	White	Loss	Nakamura Shigeru	2763.41
2	White	Loss	Hara Masao	2121.57
3	Black	Win	Tadokoro Hosai	1973.71
4	Black	Win	Kato Yasuhiro	2055.29
36 Suiseisen Tournament 1st round
Date	1996-03-01		Rating	2135.63
Round	Color	Result	Opponent
4	White	Win	Tanuma Akira	1844.71