Maruta Koji (丸田光治)

Place: Tokyo, Japan

Rating: 2176.87, Std: 93.51, Rank: 471

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

Top rating: 2231.35 (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	2176.87
Round	Color	Result	Opponent
3	White	Win	Suzuki Yoshitaka	1959.23
4	White	Loss	Yoshikawa Tomoki	2318.08
19th All Japan Championship
Date	2025-06-28		Rating	2176.87
Round	Color	Result	Opponent
1	Black	Loss	Park Woong-bae	2446.38
2	White	Loss	Ishitani Shin-ichi	2378.67
3	White	Loss	Maruta Hiroki	2278.47
4	White	Win	Suzuki Yoshitaka	1959.23
5	Black	Loss	Kawamura Norihiko	2456.14
6	White	Win	Kawaai Hitoshi	2062.08
4th Masters Renju Tournament
Date	2025-03-23		Rating	2181.84
Round	Color	Result	Opponent
2	Black	Loss	Iwano Fumio	2225.06
3	White	Win	Maruyama Yasushi	2195.90
4	Black	Win	Yamamoto Yasuhiro	2183.54
5	White	Loss	Ishitani Shin-ichi	2394.82
41st Kanto Championship
Date	2024-07-21		Rating	2184.63
Round	Color	Result	Opponent
2	White	Win	Suzuki Yoshitaka	1977.35
3	White	Loss	Matsuda Shoma	2501.45
4	White	Loss	Takazawa Nagayoshi	2234.45
5	White	Win	Li Haoyang	2094.21
6	White	Loss	Tanaka Shotaro	2327.87
18th All Japan Championship
Date	2024-02-12		Rating	2191.20
Round	Color	Result	Opponent
1	White	Loss	Fujita Maiko	2413.82
2	Black	Win	Jang Eun Min	2347.64
3	White	Win	Ishitani Shin-ichi	2411.14
4	White	Loss	Park Woong-bae	2403.99
5	White	Win	Tanaka Shotaro	2321.20
6	White	Loss	Lee Ho June	2468.03
24 Kanto Renju Emperor Tournament Kanto area 1st round
Date	2023-11-19		Rating	2179.99
Round	Color	Result	Opponent
3	White	Loss	Tanaka Shotaro	2315.11
4	Black	Loss	Yoshikawa Tomoki	2184.98
40th Kanto Championship
Date	2023-07-09		Rating	2174.39
Round	Color	Result	Opponent
1	Black	Loss	Tanaka Shotaro	2322.75
4	White	Win	Suzuki Yoshitaka	1978.13
17th All Japan Championship
Date	2023-03-19		Rating	2170.35
Round	Color	Result	Opponent
5	White	Loss	Matsuda Shoma	2378.29
6	White	Loss	Takazawa Nagayoshi	2287.69
23 Kanto Renju Emperor Tournament 2nd round
Date	2023-01-29		Rating	2171.68
Round	Color	Result	Opponent
1	Black	Loss	Kamiya Shunsuke	2858.30
2	White	Loss	Fujita Maiko	2423.06
3	White	Loss	Yokoyama Shota	2469.69
4	White	Loss	Inoue Fumiya	2531.83
5	White	Loss	Okabe Hiroshi	2692.08
23 Renju Emperor Tournament Kanto area 1st round
Date	2022-11-06		Rating	2178.82
Round	Color	Result	Opponent
2	White	Win	Kasahara Reiko	1745.45
3	White	Win	Tomobe Katsuhiro	2112.56
4	Black	Win	Tanaka Shotaro	2326.40
39 Kanto Championship
Date	2022-07-31		Rating	2174.28
Round	Color	Result	Opponent
2	White	Win	Li Haoyang	2010.57
3	White	Loss	Ishitani Shin-ichi	2361.39
Special Tournament
Date	2022-04-10		Rating	2168.76
Round	Color	Result	Opponent
1	White	Loss	Fujita Maiko	2412.85
2	White	Loss	Inoue Fumiya	2512.30
3	White	Win	Maruta Hiroki	2218.64
38 Kanto Championship
Date	2021-08-08		Rating	2149.82
Round	Color	Result	Opponent
1	White	Loss	Inoue Fumiya	2504.44
2	White	Win	Kobayashi Nanako	2013.84
3	White	Win	Fujita Maiko	2353.49
16th All Japan Championship
Date	2021-03-28		Rating	2125.31
Round	Color	Result	Opponent
1	White	Loss	Makino Mitsunori	2565.02
2	White	Loss	Ishitani Shin-ichi	2351.57
3	White	Loss	Yoshimoto Yuta	2241.51
4	White	Loss	Kawaai Hitoshi	2015.12
5	White	Loss	Suenaga Daiki	2264.32
6	Black	Win	Maruta Hiroki	2232.22
24th New Year(Mikami)Cup
Date	2021-01-29		Rating	2120.68
Round	Color	Result	Opponent
S1	Black	Win	Maruta Hiroki	2230.60
S2	White	Loss	Makino Mitsunori	2558.65
S3	White	Loss	Okabe Hiroshi	2734.67
S4	Black	Loss	Ono Takayuki	2392.39
S5	White	Loss	Ishitani Shin-ichi	2367.14
21 Renju Emperor Tournament Kanto area 1st round
Date	2020-11-15		Rating	2113.18
Round	Color	Result	Opponent
1	White	Loss	Kawaai Hitoshi	2014.90
2	White	Loss	Suenaga Daiki	2269.51
3	White	Loss	Shimura Hiroki	1997.88
4	White	Win	Kasahara Reiko	1723.10
37 Kanto Championship
Date	2020-08-10		Rating	2119.55
Round	Color	Result	Opponent
3	White	Win	Okada Akihiro	1937.85
5	Black	Loss	Kato Yasuhiro	2088.19
6	Black	Win	Shimura Hiroki	1965.27
58 Meijinsen Qualification Kanto area 1st round
Date	2020-06-21		Rating	2122.79
Round	Color	Result	Opponent
1	White	Loss	Fujita Maiko	2371.02
2	White	Win	Ito Midori	1785.06
20 Renju Emperor Tournament Kanto area 1st round
Date	2019-11-10		Rating	2139.02
Round	Color	Result	Opponent
2	White	Win	Shibata Satoru	1826.86
3	White	Loss	Ishitani Shin-ichi	2376.38
4	White	Win	Tomobe Katsuhiro	2134.19
36 Kanto Championship
Date	2019-07-28		Rating	2141.59
Round	Color	Result	Opponent
5	White	Win	Shibata Satoru	1822.28
6	White	Loss	Miyamoto Syunju	2285.45
57 Meijinsen Qualification East Japan area 2nd round
Date	2019-06-23		Rating	2143.10
Round	Color	Result	Opponent
1	White	Loss	Kusajima Masato	2258.96
2	White	Loss	Koyama Jun	2606.89
3	Black	Win	Maruta Hiroki	2187.43
4	White	Loss	Ono Takayuki	2399.74
5	White	Draw	Inoue Fumiya	2426.22
57 Meijinsen Qualification Kanto area 1st round
Date	2019-05-12		Rating	2143.46
Round	Color	Result	Opponent
1	White	Win	Inoue Fumiya	2426.85
2	White	Win	Maruta Hiroki	2189.86
3	White	Loss	Ono Takayuki	2402.25
4	Black	Loss	Mitsumori Masao	2316.85
13 Middle-dan Players Tournament
Date	2018-08-12		Rating	2117.00
Round	Color	Result	Opponent
1	White	Loss	Kusajima Masato	2305.68
2	White	Loss	Miyamoto Syunju	2264.05
4	White	Loss	Kusajima Masato	2305.68
5	White	Loss	Miyamoto Syunju	2264.05
35 Kanto Championship
Date	2018-07-16		Rating	2117.70
Round	Color	Result	Opponent
1	Black	Loss	Nakayama Tomoharu	2837.08
56 Meijinsen Qualification Kanto area 1st round
Date	2018-05-13		Rating	2119.47
Round	Color	Result	Opponent
1	White	Loss	Sato Kiyotomi	2442.80
18 Kanto Renju Emperor Tournament 1st round
Date	2017-11-01		Rating	2127.68
Round	Color	Result	Opponent
1	White	Loss	Okabe Hiroshi	2721.51
2	Black	Win	Koyama Akihiro	1965.59
3	White	Loss	Ishitani Shin-ichi	2395.22
4	White	Loss	Maruta Hiroki	2144.38
34 Kanto Championship
Date	2017-07-16		Rating	2137.09
Round	Color	Result	Opponent
1	White	Win	Matsumoto Hiro	1728.15
2	Black	Loss	Ishitani Shin-ichi	2394.25
3	White	Loss	Ishima Ryoma	2163.40
12th All Japan Championship
Date	2017-03-26		Rating	2153.84
Round	Color	Result	Opponent
1	White	Draw	Iio Yoshihiro	2547.11
2	White	Loss	Tachi Masaya	2531.09
3	Black	Draw	Nishida Toshio	2091.25
4	Black	Loss	Ono Takayuki	2368.30
5	White	Win	Sakamoto Suzan	2272.39
6	White	Loss	Fujita Yudai	2488.70
17 Kanto Renju Emperor Tournament 2nd round
Date	2016-12-10		Rating	2163.49
Round	Color	Result	Opponent
1	Black	Loss	Nakayama Tomoharu	2784.36
2	White	Loss	Okabe Hiroshi	2715.86
3	Black	Loss	Sato Kiyotomi	2502.73
4	White	Loss	Ishitani Shin-ichi	2399.93
5	White	Loss	Nakamura Shigeru	2960.03
17 Kanto Renju Emperor Tournament 1st round
Date	2016-11-23		Rating	2165.80
Round	Color	Result	Opponent
1	White	Loss	Okabe Hiroshi	2714.54
2	Black	Win	Demachi Koichiro	1933.99
3	White	Loss	Sato Kiyotomi	2503.83
4	White	Win	Maruta Hiroki	2119.57
ex1	Black	Loss	Iwano Fumio	2271.14
33 Kanto Championship
Date	2016-07-31		Rating	2179.88
Round	Color	Result	Opponent
1	White	Win	Cho Enkun	1652.72
2	Black	Loss	Okabe Hiroshi	2723.16
3	White	Win	Kato Yasuhiro	2045.78
54 Meijinsen Qualification Kanto area 1st round
Date	2016-05-22		Rating	2185.96
Round	Color	Result	Opponent
2	Black	Loss	Sato Kiyotomi	2521.96
3	White	Win	Iwano Fumio	2243.63
4	Black	Loss	Mitsumori Masao	2355.83
11th All Japan Championship
Date	2016-01-11		Rating	2194.74
Round	Color	Result	Opponent
1	Black	Loss	Kamiya Shunsuke	2723.42
2	Black	Draw	Chigira Makoto	2030.23
3	White	Loss	Fujita Yudai	2447.99
5	White	Win	Kato Yasuhiro	2039.99
6	White	Win	Suzuki Rin	1923.95
Kanto Championship
Date	2015-07-20		Rating	2206.19
Round	Color	Result	Opponent
1	White	Loss	Nakayama Tomoharu	2764.20
4	White	Win	Hashimoto Takuya	2012.32
5	Black	Win	Kato Yasuhiro	2055.70
6	White	Win	Fujikawa Masaki	2108.27
10th All Japan Championship
Date	2015-03-29		Rating	2202.70
Round	Color	Result	Opponent
1	White	Loss	Kamiya Shunsuke	2676.34
2	White	Win	Fujikawa Masaki	2094.51
31th Kanto Championship
Date	2014-05-11		Rating	2182.47
Round	Color	Result	Opponent
2	White	Loss	Tamura Kazumasa	2522.78
3	White	Loss	Tomobe Katsuhiro	2113.36
4	White	Win	Maruta Hiroki	2104.12
11th Middle-dan players Tournament
Date	2013-08-17		Rating	2175.55
Round	Color	Result	Opponent
1	White	Loss	Kashihara Akihiko	2341.66
2	Black	Loss	Kato Yasuhiro	2134.19
3	White	Win	Maruta Hiroki	2137.51
4	White	Win	Kubo Izumi	2093.88
5	Black	Win	Miyagawa Junzo	2219.43
6	White	Loss	Nakayama Tomoharu	2651.66
51 Meijinsen Qualification East-Japan area 1st round
Date	2013-06-16		Rating	2170.54
Round	Color	Result	Opponent
1	White	Loss	Isobe Taizan	2393.06
29th Kanto Championship
Date	2013-05-12		Rating	2168.55
Round	Color	Result	Opponent
3	Black	Loss	Suzuki Rin	2049.47
4	White	Win	Nakamura Souta	2077.83
5	White	Win	Tada Ayako	2289.75
13 Kanto Renju Emperor Tournament 1st round
Date	2012-10-21		Rating	2148.57
Round	Color	Result	Opponent
1	White	Win	Higuchi Fumiya	1605.06
2	Black	Win	Mitsumori Masao	2347.83
3	White	Loss	Tada Ayako	2305.70
4	White	Loss	Ishitani Shin-ichi	2360.55
50 Meijinsen Qualification East-Japan area 1st round
Date	2012-06-03		Rating	2130.36
Round	Color	Result	Opponent
1	White	Loss	Mitsumori Masao	2365.06
2	White	Loss	Iwano Fumio	2133.94
3	White	Loss	Ono Takayuki	2431.06
4	Black	Win	Maruta Hiroki	2093.59
4th Tohoku Championship
Date	2012-04-08		Rating	2125.58
Round	Color	Result	Opponent
1	Black	Loss	Nakamura Shigeru	2881.70
2	White	Win	Maruta Hiroki	2085.93
3	White	Loss	Kobayashi Koichi	2224.35
4	White	Loss	Kusajima Masato	2182.36
5	White	Win	Hirono Masakazu	1998.65
12 Kanto Renju Emperor Tournament 1st round
Date	2011-10-23		Rating	2111.73
Round	Color	Result	Opponent
1	White	Loss	Kamiya Shunsuke	2442.34
49 Meijinsen Qualification East-Japan area 1st round
Date	2011-06-12		Rating	2102.69
Round	Color	Result	Opponent
1	White	Loss	Kamiya Shunsuke	2419.45
28th Kanto Championship
Date	2011-05-22		Rating	2101.58
Round	Color	Result	Opponent
1	White	Loss	Nakayama Tomoharu	2547.01
2	White	Loss	Arai Kazumi	2371.74
3	White	Loss	Suzuki Rin	1991.64
4	White	Win	Maruta Hiroki	2110.96
5	White	Loss	Fujikawa Masaki	2101.49
11 Kanto Renju Emperor Tournament 1st round
Date	2010-10-31		Rating	2110.88
Round	Color	Result	Opponent
1	Black	Win	Kato Yasuhiro	2069.02
2	White	Loss	Okabe Hiroshi	2696.71
Meijinsen Qualification East-Japan area 1st round
Date	2010-06-27		Rating	2110.96
Round	Color	Result	Opponent
1	White	Loss	Fukui Nobuhiro	2321.01
2	White	Win	Arai Kazumi	2317.55
3	White	Loss	Kudomi Takahiro	2397.88
4	Black	Loss	Tada Ayako	2194.26
27th Kanto Championship
Date	2010-05-23		Rating	2111.00
Round	Color	Result	Opponent
1	Black	Loss	Nakamura Shigeru	2858.31
2	White	Loss	Tomobe Katsuhiro	2208.75
5th All Japan Championship
Date	2010-03-21		Rating	2113.72
Round	Color	Result	Opponent
4	Black	Win	Kusajima Masato	2169.29
10 Kanto Renju Emperor Tournament 1st round
Date	2009-10-04		Rating	2110.15
Round	Color	Result	Opponent
1	White	Loss	Tanji Hiroki	2053.43
2	White	Loss	Tomobe Katsuhiro	2153.81
3	White	Win	Tanizaki Ryusuke	2104.74
4	Black	Win	Fujikawa Masaki	2050.45
26th Kanto Championship
Date	2009-05-17		Rating	2108.91
Round	Color	Result	Opponent
4	Black	Win	Matsuoka Teruo	1909.38
5	Black	Win	Kato Yasuhiro	2024.84
4th All Japan Championship
Date	2009-03-21		Rating	2104.47
Round	Color	Result	Opponent
4	White	Win	Suzuki Rin	1952.76
5	Black	Loss	Tanizaki Ryusuke	2126.29
6	Black	Loss	Nagao Noriaki	2272.46
9th Kanto Renju Emperor Tournament, 1st round
Date	2008-10-26		Rating	2100.38
Round	Color	Result	Opponent
1	White	Draw	Tamada Yoichi	2268.38
2	White	Win	Tada Ayako	2006.47
3	White	Loss	Ono Takayuki	2409.83
4	White	Loss	Nakayama Tomoharu	2286.05
25th Kanto Championship
Date	2008-05-18		Rating	2092.42
Round	Color	Result	Opponent
3	White	Win	Tanizaki Ryusuke	2120.92
4	Black	Win	Kobayashi Koichi	2098.58
5	Black	Loss	Kudomi Takahiro	2337.20
3rd All Japan Championship
Date	2008-03-23		Rating	2084.34
Round	Color	Result	Opponent
1	White	Loss	Yamaguchi Yusui	2613.56
2	White	Loss	Kato Yasuhiro	1985.98
3	White	Loss	Tadokoro Hosai	1926.76
4	White	Loss	Fujikawa Masaki	2106.64
5	White	Loss	Nakayama Tomoharu	2231.49
6	White	Draw	Tanizaki Ryusuke	2121.65
8 Kanto Renju Emperor Tournament 1st round
Date	2007-10-21		Rating	2098.22
Round	Color	Result	Opponent
1	White	Win	Takeuchi Shunsuke	1937.39
2	White	Win	Yamashita Daisuke	1903.31
3	White	Loss	Ishitani Shin-ichi	2398.82
4	White	Loss	Nakayama Tomoharu	2203.19
5	Black	Win	Matsuoka Teruo	1872.73
45th Meijinsen Qualification East-Japan area 1st round
Date	2007-06-17		Rating	2106.23
Round	Color	Result	Opponent
1	Black	Win	Tanizaki Ryusuke	2137.72
2	Black	Loss	Isobe Taizan	2433.53
3	White	Loss	Iwano Fumio	2164.73
4	White	Win	Hara Masao	2053.84
7th Kanto Renju Emperor Tournament - 1st round
Date	2006-10-15		Rating	2110.30
Round	Color	Result	Opponent
1	Black	Win	Matsuoka Teruo	1856.67
2	White	Loss	Maruta Hiroki	2009.67
3	Black	Win	Fujikawa Masaki	2054.97
4	Black	Loss	Hara Masao	2092.37
5	Black	Win	Tanizaki Ryusuke	2128.03
Meijin-sen Qual, East Japan area 1st round
Date	2006-06-18		Rating	2112.70
Round	Color	Result	Opponent
1	White	Loss	Koyama Jun	2338.56
2	Black	Loss	Arita Nobuyoshi	2368.64
3	White	Loss	Ono Takayuki	2301.10
4	Black	Loss	Hara Masao	2083.77
23rd Kanto Championship
Date	2006-05-21		Rating	2116.98
Round	Color	Result	Opponent
1	White	Win	Iwano Fumio	2095.24
2	Black	Loss	Mitsumori Masao	2258.54
3	Black	Win	Tadokoro Hosai	1934.67
4	Black	Loss	Nakamura Shigeru	2847.00
5	White	Loss	Hara Masao	2083.26
1st All Japan Championship
Date	2006-03-26		Rating	2126.43
Round	Color	Result	Opponent
4	White	Win	Tadokoro Hosai	1930.68
5	Black	Win	Kato Yasuhiro	2054.65
6	White	Win	Tomobe Katsuhiro	2090.53
6th Kanto Renju Emperor Tournament - 1st round
Date	2005-10-22		Rating	2133.77
Round	Color	Result	Opponent
1	Black	Win	Iwano Fumio	2071.25
2	White	Loss	Itami Yoshiyuki	2182.13
3	Black	Loss	Tomobe Katsuhiro	2080.50
4	White	Loss	Arita Nobuyoshi	2346.54
43rd Meijinsen Qualification: East Japan 1st round
Date	2005-06-12		Rating	2152.10
Round	Color	Result	Opponent
1	White	Loss	Koyama Jun	2279.11
2	White	Win	Tanno Yoshitaka	2093.80
3	White	Loss	Nagao Noriaki	2229.76
4	Black	Loss	Itami Yoshiyuki	2189.36
22nd Kanto Championship
Date	2005-05-22		Rating	2156.75
Round	Color	Result	Opponent
1	White	Win	Ishizaki Masatoshi	1915.63
2	Black	Loss	Kawamura Norihiko	2692.53
3	Black	Win	Sasaki Miyu	1965.11
4	White	Win	Koyama Jun	2276.39
5	White	Loss	Ishitani Shin-ichi	2397.43
Japan WC Qualification tournament
Date	2005-04-03		Rating	2162.87
Round	Color	Result	Opponent
4	White	Win	Tanizaki Ryusuke	2074.18
5	Black	Win	Kato Yasuhiro	2024.97
6	White	Loss	Kubo Izumi	2170.53
5th Kanto Renju Emperor Tournament - 1st round
Date	2004-11-28		Rating	2175.84
Round	Color	Result	Opponent
1	Black	Loss	Sato Koichi	2011.98
2	White	Win	Sasaki Miyu	1955.49
3	Black	Win	Maruta Hiroki	1958.25
4	White	Win	Matsuoka Teruo	1887.65
42nd Meijinsen Qualification: East Japan 1st round
Date	2004-06-13		Rating	2195.33
Round	Color	Result	Opponent
4	Black	Loss	Sano Hiroyuki	2165.84
4th Kanto Renju Emperor Tournament - 2nd round
Date	2003-11-30		Rating	2229.89
Round	Color	Result	Opponent
	White	Win	Nagao Noriaki	2282.13
	White	Win	Mitsumori Masao	2267.37
	Black	Loss	Isobe Taizan	2424.26
	Black	Loss	Yamaguchi Yusui	2595.08
	Black	Loss	Okabe Hiroshi	2559.30
4th Kanto Renju Emperor Tournament - 1st round
Date	2003-11-16		Rating	2231.35
Round	Color	Result	Opponent
1	Black	Win	Yamauchi Yasuhiro	1805.18
2	White	Win	Nagao Noriaki	2285.71
3	White	Draw	Yamaguchi Yusui	2593.36
4	White	Win	Kubo Izumi	2219.75
41th Meijinsen Qualification: East Japan 1st round
Date	2003-06-08		Rating	2220.88
Round	Color	Result	Opponent
1	White	Loss	Sano Hiroyuki	2210.40
2	White	Win	Mitsumori Masao	2293.59
3	White	Loss	Sato Kiyotomi	2299.35
4	Black	Draw	Kubo Izumi	2225.79
40th Meijinsen Qualification: East Japan 1st round
Date	2002-06-02		Rating	2208.87
Round	Color	Result	Opponent
1	White	Loss	Isobe Taizan	2449.64
2	Black	Loss	Kato Yasuhiro	2098.92
3	White	Win	Ohno Syunzo	1995.65
4	Black	Win	Sato Takuma	2070.22
38th Meijinsen Qualification: East Japan 1st round
Date	2000-06-04		Rating	2210.85
Round	Color	Result	Opponent
1	Black	Win	Sunagawa Shouki	2213.06
2	White	Win	Mitsumori Masao	2294.75
3	White	Loss	Kudomi Takahiro	2356.41
4	White	Loss	Isobe Taizan	2456.45
Kanto Championship
Date	2000-05-14		Rating	2209.45
Round	Color	Result	Opponent
1	White	Loss	Nakamura Shigeru	2763.67
2	White	Loss	Hara Masao	2121.64
3	Black	Win	Tadokoro Hosai	1973.78
4	Black	Win	Kato Yasuhiro	2055.31
36 Suiseisen Tournament 1st round
Date	1996-03-01		Rating	2135.67
Round	Color	Result	Opponent
4	White	Win	Tanuma Akira	1844.72