Maruta Koji (丸田光治)

Place: Tokyo, Japan

Rating: 2174.63, Std: 92.97, Rank: 477

First game: 1996-03-01, Last game: 2025-04-20

Top rating: 2231.52 (2003-11-16)

Games: 260, Wins: 102, Draws: 8, Losses: 150

Gy1: 15, Gy2: 25, Gy5: 61

19th All Japan Championship
Date	2025-04-20		Rating	2174.63
Round	Color	Result	Opponent
1	Black	Loss	Park Woong-bae	2450.53
2	White	Loss	Ishitani Shin-ichi	2374.73
3	White	Loss	Maruta Hiroki	2295.91
4	White	Win	Suzuki Yoshitaka	1944.22
5	Black	Loss	Kawamura Norihiko	2389.46
6	White	Win	Kawaai Hitoshi	2047.13
4th Masters Renju Tournament
Date	2025-03-23		Rating	2175.98
Round	Color	Result	Opponent
2	Black	Loss	Iwano Fumio	2217.19
3	White	Win	Maruyama Yasushi	2192.08
4	Black	Win	Yamamoto Yasuhiro	2178.43
5	White	Loss	Ishitani Shin-ichi	2380.20
41st Kanto Championship
Date	2024-07-21		Rating	2178.24
Round	Color	Result	Opponent
2	White	Win	Suzuki Yoshitaka	1962.17
3	White	Loss	Matsuda Shoma	2490.79
4	White	Loss	Takazawa Nagayoshi	2228.84
5	White	Win	Li Haoyang	2084.51
6	White	Loss	Tanaka Shotaro	2312.40
18th All Japan Championship
Date	2024-02-12		Rating	2184.94
Round	Color	Result	Opponent
1	White	Loss	Fujita Maiko	2407.25
2	Black	Win	Jang Eun Min	2343.75
3	White	Win	Ishitani Shin-ichi	2403.83
4	White	Loss	Park Woong-bae	2400.68
5	White	Win	Tanaka Shotaro	2309.75
6	White	Loss	Lee Ho June	2462.94
24 Kanto Renju Emperor Tournament Kanto area 1st round
Date	2023-11-19		Rating	2173.81
Round	Color	Result	Opponent
3	White	Loss	Tanaka Shotaro	2305.11
4	Black	Loss	Yoshikawa Tomoki	2177.52
40th Kanto Championship
Date	2023-07-09		Rating	2168.42
Round	Color	Result	Opponent
1	Black	Loss	Tanaka Shotaro	2314.41
4	White	Win	Suzuki Yoshitaka	1968.74
17th All Japan Championship
Date	2023-03-19		Rating	2164.64
Round	Color	Result	Opponent
5	White	Loss	Matsuda Shoma	2372.35
6	White	Loss	Takazawa Nagayoshi	2282.90
23 Kanto Renju Emperor Tournament 2nd round
Date	2023-01-29		Rating	2166.08
Round	Color	Result	Opponent
1	Black	Loss	Kamiya Shunsuke	2853.11
2	White	Loss	Fujita Maiko	2418.33
3	White	Loss	Yokoyama Shota	2465.00
4	White	Loss	Inoue Fumiya	2527.06
5	White	Loss	Okabe Hiroshi	2687.55
23 Renju Emperor Tournament Kanto area 1st round
Date	2022-11-06		Rating	2173.39
Round	Color	Result	Opponent
2	White	Win	Kasahara Reiko	1734.41
3	White	Win	Tomobe Katsuhiro	2106.53
4	Black	Win	Tanaka Shotaro	2320.08
39 Kanto Championship
Date	2022-07-31		Rating	2169.09
Round	Color	Result	Opponent
2	White	Win	Li Haoyang	2005.93
3	White	Loss	Ishitani Shin-ichi	2355.77
Special Tournament
Date	2022-04-10		Rating	2163.85
Round	Color	Result	Opponent
1	White	Loss	Fujita Maiko	2408.65
2	White	Loss	Inoue Fumiya	2507.89
3	White	Win	Maruta Hiroki	2214.44
38 Kanto Championship
Date	2021-08-08		Rating	2145.44
Round	Color	Result	Opponent
1	White	Loss	Inoue Fumiya	2500.48
2	White	Win	Kobayashi Nanako	2011.88
3	White	Win	Fujita Maiko	2349.99
16th All Japan Championship
Date	2021-03-28		Rating	2121.17
Round	Color	Result	Opponent
1	White	Loss	Makino Mitsunori	2560.65
2	White	Loss	Ishitani Shin-ichi	2347.47
3	White	Loss	Yoshimoto Yuta	2237.53
4	White	Loss	Kawaai Hitoshi	2010.63
5	White	Loss	Suenaga Daiki	2260.99
6	Black	Win	Maruta Hiroki	2228.39
24th New Year(Mikami)Cup
Date	2021-01-29		Rating	2116.64
Round	Color	Result	Opponent
S1	Black	Win	Maruta Hiroki	2226.86
S2	White	Loss	Makino Mitsunori	2554.43
S3	White	Loss	Okabe Hiroshi	2731.33
S4	Black	Loss	Ono Takayuki	2388.94
S5	White	Loss	Ishitani Shin-ichi	2363.21
21 Renju Emperor Tournament Kanto area 1st round
Date	2020-11-15		Rating	2109.25
Round	Color	Result	Opponent
1	White	Loss	Kawaai Hitoshi	2010.61
2	White	Loss	Suenaga Daiki	2266.52
3	White	Loss	Shimura Hiroki	1993.75
4	White	Win	Kasahara Reiko	1716.24
37 Kanto Championship
Date	2020-08-10		Rating	2115.78
Round	Color	Result	Opponent
3	White	Win	Okada Akihiro	1933.21
5	Black	Loss	Kato Yasuhiro	2084.41
6	Black	Win	Shimura Hiroki	1961.26
58 Meijinsen Qualification Kanto area 1st round
Date	2020-06-21		Rating	2119.11
Round	Color	Result	Opponent
1	White	Loss	Fujita Maiko	2368.11
2	White	Win	Ito Midori	1776.52
20 Renju Emperor Tournament Kanto area 1st round
Date	2019-11-10		Rating	2135.81
Round	Color	Result	Opponent
2	White	Win	Shibata Satoru	1823.19
3	White	Loss	Ishitani Shin-ichi	2373.50
4	White	Win	Tomobe Katsuhiro	2130.85
36 Kanto Championship
Date	2019-07-28		Rating	2138.59
Round	Color	Result	Opponent
5	White	Win	Shibata Satoru	1818.66
6	White	Loss	Miyamoto Syunju	2282.53
57 Meijinsen Qualification East Japan area 2nd round
Date	2019-06-23		Rating	2140.17
Round	Color	Result	Opponent
1	White	Loss	Kusajima Masato	2256.17
2	White	Loss	Koyama Jun	2605.64
3	Black	Win	Maruta Hiroki	2184.68
4	White	Loss	Ono Takayuki	2397.17
5	White	Draw	Inoue Fumiya	2423.80
57 Meijinsen Qualification Kanto area 1st round
Date	2019-05-12		Rating	2140.61
Round	Color	Result	Opponent
1	White	Win	Inoue Fumiya	2424.46
2	White	Win	Maruta Hiroki	2187.18
3	White	Loss	Ono Takayuki	2399.76
4	Black	Loss	Mitsumori Masao	2315.13
13 Middle-dan Players Tournament
Date	2018-08-12		Rating	2114.61
Round	Color	Result	Opponent
1	White	Loss	Kusajima Masato	2303.37
2	White	Loss	Miyamoto Syunju	2261.66
4	White	Loss	Kusajima Masato	2303.37
5	White	Loss	Miyamoto Syunju	2261.66
35 Kanto Championship
Date	2018-07-16		Rating	2115.36
Round	Color	Result	Opponent
1	Black	Loss	Nakayama Tomoharu	2836.33
56 Meijinsen Qualification Kanto area 1st round
Date	2018-05-13		Rating	2117.23
Round	Color	Result	Opponent
1	White	Loss	Sato Kiyotomi	2441.25
18 Kanto Renju Emperor Tournament 1st round
Date	2017-11-01		Rating	2125.75
Round	Color	Result	Opponent
1	White	Loss	Okabe Hiroshi	2720.56
2	Black	Win	Koyama Akihiro	1964.00
3	White	Loss	Ishitani Shin-ichi	2393.66
4	White	Loss	Maruta Hiroki	2142.53
34 Kanto Championship
Date	2017-07-16		Rating	2135.32
Round	Color	Result	Opponent
1	White	Win	Matsumoto Hiro	1727.12
2	Black	Loss	Ishitani Shin-ichi	2392.85
3	White	Loss	Ishima Ryoma	2162.23
12th All Japan Championship
Date	2017-03-26		Rating	2152.22
Round	Color	Result	Opponent
1	White	Draw	Iio Yoshihiro	2545.82
2	White	Loss	Tachi Masaya	2530.10
3	Black	Draw	Nishida Toshio	2089.88
4	Black	Loss	Ono Takayuki	2366.93
5	White	Win	Sakamoto Suzan	2270.79
6	White	Loss	Fujita Yudai	2487.62
17 Kanto Renju Emperor Tournament 2nd round
Date	2016-12-10		Rating	2161.99
Round	Color	Result	Opponent
1	Black	Loss	Nakayama Tomoharu	2783.73
2	White	Loss	Okabe Hiroshi	2715.03
3	Black	Loss	Sato Kiyotomi	2501.58
4	White	Loss	Ishitani Shin-ichi	2398.88
5	White	Loss	Nakamura Shigeru	2959.30
17 Kanto Renju Emperor Tournament 1st round
Date	2016-11-23		Rating	2164.32
Round	Color	Result	Opponent
1	White	Loss	Okabe Hiroshi	2713.71
2	Black	Win	Demachi Koichiro	1932.55
3	White	Loss	Sato Kiyotomi	2502.70
4	White	Win	Maruta Hiroki	2118.16
ex1	Black	Loss	Iwano Fumio	2269.71
33 Kanto Championship
Date	2016-07-31		Rating	2178.50
Round	Color	Result	Opponent
1	White	Win	Cho Enkun	1652.08
2	Black	Loss	Okabe Hiroshi	2722.41
3	White	Win	Kato Yasuhiro	2044.29
54 Meijinsen Qualification Kanto area 1st round
Date	2016-05-22		Rating	2184.65
Round	Color	Result	Opponent
2	Black	Loss	Sato Kiyotomi	2521.00
3	White	Win	Iwano Fumio	2242.38
4	Black	Loss	Mitsumori Masao	2354.80
11th All Japan Championship
Date	2016-01-11		Rating	2193.55
Round	Color	Result	Opponent
1	Black	Loss	Kamiya Shunsuke	2722.93
2	Black	Draw	Chigira Makoto	2029.08
3	White	Loss	Fujita Yudai	2447.16
5	White	Win	Kato Yasuhiro	2038.77
6	White	Win	Suzuki Rin	1923.31
Kanto Championship
Date	2015-07-20		Rating	2205.14
Round	Color	Result	Opponent
1	White	Loss	Nakayama Tomoharu	2763.84
4	White	Win	Hashimoto Takuya	2011.55
5	Black	Win	Kato Yasuhiro	2054.68
6	White	Win	Fujikawa Masaki	2107.24
10th All Japan Championship
Date	2015-03-29		Rating	2201.73
Round	Color	Result	Opponent
1	White	Loss	Kamiya Shunsuke	2675.99
2	White	Win	Fujikawa Masaki	2093.57
31th Kanto Championship
Date	2014-05-11		Rating	2181.72
Round	Color	Result	Opponent
2	White	Loss	Tamura Kazumasa	2522.58
3	White	Loss	Tomobe Katsuhiro	2112.67
4	White	Win	Maruta Hiroki	2103.48
11th Middle-dan players Tournament
Date	2013-08-17		Rating	2174.98
Round	Color	Result	Opponent
1	White	Loss	Kashihara Akihiko	2341.16
2	Black	Loss	Kato Yasuhiro	2133.70
3	White	Win	Maruta Hiroki	2137.02
4	White	Win	Kubo Izumi	2093.41
5	Black	Win	Miyagawa Junzo	2219.21
6	White	Loss	Nakayama Tomoharu	2651.43
51 Meijinsen Qualification East-Japan area 1st round
Date	2013-06-16		Rating	2169.99
Round	Color	Result	Opponent
1	White	Loss	Isobe Taizan	2392.75
29th Kanto Championship
Date	2013-05-12		Rating	2168.02
Round	Color	Result	Opponent
3	Black	Loss	Suzuki Rin	2049.04
4	White	Win	Nakamura Souta	2077.28
5	White	Win	Tada Ayako	2289.37
13 Kanto Renju Emperor Tournament 1st round
Date	2012-10-21		Rating	2148.13
Round	Color	Result	Opponent
1	White	Win	Higuchi Fumiya	1604.84
2	Black	Win	Mitsumori Masao	2347.52
3	White	Loss	Tada Ayako	2305.37
4	White	Loss	Ishitani Shin-ichi	2360.33
50 Meijinsen Qualification East-Japan area 1st round
Date	2012-06-03		Rating	2129.97
Round	Color	Result	Opponent
1	White	Loss	Mitsumori Masao	2364.81
2	White	Loss	Iwano Fumio	2133.61
3	White	Loss	Ono Takayuki	2430.87
4	Black	Win	Maruta Hiroki	2093.26
4th Tohoku Championship
Date	2012-04-08		Rating	2125.22
Round	Color	Result	Opponent
1	Black	Loss	Nakamura Shigeru	2881.57
2	White	Win	Maruta Hiroki	2085.62
3	White	Loss	Kobayashi Koichi	2224.03
4	White	Loss	Kusajima Masato	2181.89
5	White	Win	Hirono Masakazu	1998.15
12 Kanto Renju Emperor Tournament 1st round
Date	2011-10-23		Rating	2111.43
Round	Color	Result	Opponent
1	White	Loss	Kamiya Shunsuke	2442.44
49 Meijinsen Qualification East-Japan area 1st round
Date	2011-06-12		Rating	2102.43
Round	Color	Result	Opponent
1	White	Loss	Kamiya Shunsuke	2419.59
28th Kanto Championship
Date	2011-05-22		Rating	2101.33
Round	Color	Result	Opponent
1	White	Loss	Nakayama Tomoharu	2546.91
2	White	Loss	Arai Kazumi	2371.85
3	White	Loss	Suzuki Rin	1991.42
4	White	Win	Maruta Hiroki	2110.75
5	White	Loss	Fujikawa Masaki	2101.24
11 Kanto Renju Emperor Tournament 1st round
Date	2010-10-31		Rating	2110.68
Round	Color	Result	Opponent
1	Black	Win	Kato Yasuhiro	2068.86
2	White	Loss	Okabe Hiroshi	2696.62
Meijinsen Qualification East-Japan area 1st round
Date	2010-06-27		Rating	2110.79
Round	Color	Result	Opponent
1	White	Loss	Fukui Nobuhiro	2320.87
2	White	Win	Arai Kazumi	2317.57
3	White	Loss	Kudomi Takahiro	2397.77
4	Black	Loss	Tada Ayako	2194.12
27th Kanto Championship
Date	2010-05-23		Rating	2110.84
Round	Color	Result	Opponent
1	Black	Loss	Nakamura Shigeru	2858.14
2	White	Loss	Tomobe Katsuhiro	2208.62
5th All Japan Championship
Date	2010-03-21		Rating	2113.57
Round	Color	Result	Opponent
4	Black	Win	Kusajima Masato	2169.05
10 Kanto Renju Emperor Tournament 1st round
Date	2009-10-04		Rating	2110.04
Round	Color	Result	Opponent
1	White	Loss	Tanji Hiroki	2053.37
2	White	Loss	Tomobe Katsuhiro	2153.72
3	White	Win	Tanizaki Ryusuke	2104.63
4	Black	Win	Fujikawa Masaki	2050.36
26th Kanto Championship
Date	2009-05-17		Rating	2108.83
Round	Color	Result	Opponent
4	Black	Win	Matsuoka Teruo	1909.30
5	Black	Win	Kato Yasuhiro	2024.78
4th All Japan Championship
Date	2009-03-21		Rating	2104.40
Round	Color	Result	Opponent
4	White	Win	Suzuki Rin	1952.69
5	Black	Loss	Tanizaki Ryusuke	2126.22
6	Black	Loss	Nagao Noriaki	2272.43
9th Kanto Renju Emperor Tournament, 1st round
Date	2008-10-26		Rating	2100.33
Round	Color	Result	Opponent
1	White	Draw	Tamada Yoichi	2268.77
2	White	Win	Tada Ayako	2006.42
3	White	Loss	Ono Takayuki	2409.84
4	White	Loss	Nakayama Tomoharu	2285.83
25th Kanto Championship
Date	2008-05-18		Rating	2092.40
Round	Color	Result	Opponent
3	White	Win	Tanizaki Ryusuke	2120.94
4	Black	Win	Kobayashi Koichi	2098.60
5	Black	Loss	Kudomi Takahiro	2337.21
3rd All Japan Championship
Date	2008-03-23		Rating	2084.32
Round	Color	Result	Opponent
1	White	Loss	Yamaguchi Yusui	2612.92
2	White	Loss	Kato Yasuhiro	1985.99
3	White	Loss	Tadokoro Hosai	1926.79
4	White	Loss	Fujikawa Masaki	2106.67
5	White	Loss	Nakayama Tomoharu	2231.34
6	White	Draw	Tanizaki Ryusuke	2121.68
8 Kanto Renju Emperor Tournament 1st round
Date	2007-10-21		Rating	2098.23
Round	Color	Result	Opponent
1	White	Win	Takeuchi Shunsuke	1937.40
2	White	Win	Yamashita Daisuke	1903.34
3	White	Loss	Ishitani Shin-ichi	2399.08
4	White	Loss	Nakayama Tomoharu	2203.06
5	Black	Win	Matsuoka Teruo	1872.73
45th Meijinsen Qualification East-Japan area 1st round
Date	2007-06-17		Rating	2106.25
Round	Color	Result	Opponent
1	Black	Win	Tanizaki Ryusuke	2137.81
2	Black	Loss	Isobe Taizan	2433.49
3	White	Loss	Iwano Fumio	2164.78
4	White	Win	Hara Masao	2053.89
7th Kanto Renju Emperor Tournament - 1st round
Date	2006-10-15		Rating	2110.37
Round	Color	Result	Opponent
1	Black	Win	Matsuoka Teruo	1856.69
2	White	Loss	Maruta Hiroki	2009.76
3	Black	Win	Fujikawa Masaki	2055.07
4	Black	Loss	Hara Masao	2092.44
5	Black	Win	Tanizaki Ryusuke	2128.15
Meijin-sen Qual, East Japan area 1st round
Date	2006-06-18		Rating	2112.78
Round	Color	Result	Opponent
1	White	Loss	Koyama Jun	2338.63
2	Black	Loss	Arita Nobuyoshi	2368.72
3	White	Loss	Ono Takayuki	2301.22
4	Black	Loss	Hara Masao	2083.86
23rd Kanto Championship
Date	2006-05-21		Rating	2117.06
Round	Color	Result	Opponent
1	White	Win	Iwano Fumio	2095.33
2	Black	Loss	Mitsumori Masao	2258.66
3	Black	Win	Tadokoro Hosai	1934.75
4	Black	Loss	Nakamura Shigeru	2846.90
5	White	Loss	Hara Masao	2083.35
1st All Japan Championship
Date	2006-03-26		Rating	2126.51
Round	Color	Result	Opponent
4	White	Win	Tadokoro Hosai	1930.76
5	Black	Win	Kato Yasuhiro	2054.75
6	White	Win	Tomobe Katsuhiro	2090.64
6th Kanto Renju Emperor Tournament - 1st round
Date	2005-10-22		Rating	2133.88
Round	Color	Result	Opponent
1	Black	Win	Iwano Fumio	2071.36
2	White	Loss	Itami Yoshiyuki	2182.25
3	Black	Loss	Tomobe Katsuhiro	2080.61
4	White	Loss	Arita Nobuyoshi	2346.64
43rd Meijinsen Qualification: East Japan 1st round
Date	2005-06-12		Rating	2152.22
Round	Color	Result	Opponent
1	White	Loss	Koyama Jun	2279.22
2	White	Win	Tanno Yoshitaka	2093.91
3	White	Loss	Nagao Noriaki	2229.91
4	Black	Loss	Itami Yoshiyuki	2189.50
22nd Kanto Championship
Date	2005-05-22		Rating	2156.88
Round	Color	Result	Opponent
1	White	Win	Ishizaki Masatoshi	1915.73
2	Black	Loss	Kawamura Norihiko	2692.60
3	Black	Win	Sasaki Miyu	1965.21
4	White	Win	Koyama Jun	2276.50
5	White	Loss	Ishitani Shin-ichi	2397.64
Japan WC Qualification tournament
Date	2005-04-03		Rating	2163.00
Round	Color	Result	Opponent
4	White	Win	Tanizaki Ryusuke	2074.30
5	Black	Win	Kato Yasuhiro	2025.09
6	White	Loss	Kubo Izumi	2170.87
5th Kanto Renju Emperor Tournament - 1st round
Date	2004-11-28		Rating	2175.98
Round	Color	Result	Opponent
1	Black	Loss	Sato Koichi	2012.11
2	White	Win	Sasaki Miyu	1955.59
3	Black	Win	Maruta Hiroki	1958.34
4	White	Win	Matsuoka Teruo	1887.71
42nd Meijinsen Qualification: East Japan 1st round
Date	2004-06-13		Rating	2195.48
Round	Color	Result	Opponent
4	Black	Loss	Sano Hiroyuki	2166.16
4th Kanto Renju Emperor Tournament - 2nd round
Date	2003-11-30		Rating	2230.05
Round	Color	Result	Opponent
	White	Win	Nagao Noriaki	2282.36
	White	Win	Mitsumori Masao	2267.56
	Black	Loss	Isobe Taizan	2424.42
	Black	Loss	Yamaguchi Yusui	2595.27
	Black	Loss	Okabe Hiroshi	2559.50
4th Kanto Renju Emperor Tournament - 1st round
Date	2003-11-16		Rating	2231.52
Round	Color	Result	Opponent
1	Black	Win	Yamauchi Yasuhiro	1805.24
2	White	Win	Nagao Noriaki	2285.94
3	White	Draw	Yamaguchi Yusui	2593.55
4	White	Win	Kubo Izumi	2220.01
41th Meijinsen Qualification: East Japan 1st round
Date	2003-06-08		Rating	2221.05
Round	Color	Result	Opponent
1	White	Loss	Sano Hiroyuki	2210.67
2	White	Win	Mitsumori Masao	2293.79
3	White	Loss	Sato Kiyotomi	2299.50
4	Black	Draw	Kubo Izumi	2226.04
40th Meijinsen Qualification: East Japan 1st round
Date	2002-06-02		Rating	2209.03
Round	Color	Result	Opponent
1	White	Loss	Isobe Taizan	2449.83
2	Black	Loss	Kato Yasuhiro	2099.05
3	White	Win	Ohno Syunzo	1995.85
4	Black	Win	Sato Takuma	2070.36
38th Meijinsen Qualification: East Japan 1st round
Date	2000-06-04		Rating	2211.01
Round	Color	Result	Opponent
1	Black	Win	Sunagawa Shouki	2213.26
2	White	Win	Mitsumori Masao	2294.99
3	White	Loss	Kudomi Takahiro	2356.62
4	White	Loss	Isobe Taizan	2456.67
Kanto Championship
Date	2000-05-14		Rating	2209.61
Round	Color	Result	Opponent
1	White	Loss	Nakamura Shigeru	2763.84
2	White	Loss	Hara Masao	2121.81
3	Black	Win	Tadokoro Hosai	1973.93
4	Black	Win	Kato Yasuhiro	2055.43
36 Suiseisen Tournament 1st round
Date	1996-03-01		Rating	2135.78
Round	Color	Result	Opponent
4	White	Win	Tanuma Akira	1844.74