Players › Tadahisa Maruyama

Tadahisa Maruyama

Player No.	194
Rank	9-dan
Date of birth	Sep 5, 1970
Birthplace	Chiba
Teacher	Yuji Sase Honorary 9-dan (deceased)

Junisen terms35

Career record205W-143L

Win rate0.589

Deviation score (FY2025)49.9

Best deviation score75.7
FY1999

Rating history and all games →

Junisen record

Term	Class	Rank	Record	Up/down	Deviation
85th term	Class B2	6	3W-2L
84th term	Class B2	7	6W-4L		49.9
83rd term	Class B2	18	6W-4L		62.3
82nd term	Class B2	2	4W-6L		59.9
81st term	Class B1	13	4W-8L	Relegated	50.2
80th term	Class B2	2	8W-2L	Promoted	65.4
79th term	Class B1	12	4W-8L	Relegated	58.1
78th term	Class B2	9	9W-1L	Promoted	62.7
77th term	Class B2	1	6W-4L		60.1
76th term	Class B1	9	2W-8L	Relegated	55.0
75th term	Class B1	7	4W-8L		60.9
74th term	Class B1	11	7W-5L		62.7
73rd term	Class B1	5	4W-8L		61.4
72nd term	Class B1	5	8W-4L		67.8
71st term	Class B1	1	6W-6L		62.5
70th term	Class A	6	2W-7L	Relegated	61.3
69th term	Class A	4	4W-5L		69.1
68th term	Class A	4	5W-4L		64.1
67th term	Class A	4	5W-4L		62.4
66th term	Class A	5	6W-3L		69.0
65th term	Class A	5	4W-5L		68.1
64th term	Class A	6	4W-5L		70.1
63rd term	Class A	4	4W-5L		64.8
62nd term	Class A	5	5W-4L		63.9
61st term	Class A	1	4W-5L		67.4
58th term	Class A	3	8W-1L	Challenger	75.7
57th term	Class A	9	6W-2L		68.8
56th term	Class B1	12	12W-0L	Promoted	64.5
55th term	Class B2	5	9W-1L	Promoted	67.6
54th term	Class B2	19	7W-3L		70.0
53rd term	Class C1	2	9W-1L	Promoted	71.3
52nd term	Class C1	11	9W-1L		62.0
51st term	Class C1	22	6W-4L		60.4
50th term	Class C2	25	9W-1L	Promoted	66.1
49th term	Class C2	52	6W-4L		61.8

How the deviation score is calculated: see here.

Titles won

Meijin-sen	2 terms (58th and 59th terms)
Kio-sen	1 terms (28th term)

Ryuo-sen and Eio-sen from 2007 only; others are all-time records.

Terms in each class

Class A	14 terms (incl. 2 terms as Meijin)
Class B1	9 terms
Class B2	9 terms
Class C1	3 terms
Class C2	2 terms

Promotion history

Jun 28, 2000	9-dan
Apr 1, 1998	8-dan
Apr 1, 1997	7-dan
Apr 1, 1995	6-dan
Apr 1, 1992	5-dan
Apr 1, 1990	4-dan
1986	1-dan

Career win milestones

100 wins	Sep 28, 1992 Kachinuki-sen
200 wins	Apr 15, 1995 Hayazashi Shin-ei-sen
300 wins	Aug 29, 1997 Junisen
400 wins	Apr 22, 2000 Meijin-sen
500 wins	Jul 15, 2003 Junisen
600 wins	May 6, 2007 Net Saikyo-sen
700 wins	Dec 24, 2010 Asahi Cup
800 wins	Sep 25, 2014 Junisen
900 wins	Apr 12, 2019 Kio-sen
1000 wins	Nov 1, 2023 Ginga-sen

Best wins (highest-rated opponents)

Nov 1, 2023	Sota Fujii 2152	Ginga-sen
Sep 27, 2024	Sota Fujii 2143	Ginga-sen
Apr 22, 2005	Yoshiharu Habu 2079	Ryuo-sen
Feb 10, 2001	Yoshiharu Habu 2052	Hayazashi-sen
Jul 24, 2020	Sota Fujii 2049	Ryuo-sen

Career wins and ratings are counted from the games recorded on this site (official games from FY1964, and Junisen games before that) and may differ from official records.

Frequent opponents

Yasumitsu Satoh	35W-37L	Head-to-head
Yoshiharu Habu	23W-44L	Head-to-head
Koji Tanigawa	33W-32L	Head-to-head
Masataka Goda	38W-26L	Head-to-head
Toshiaki Kubo	27W-28L	Head-to-head
Toshiyuki Moriuchi	28W-25L	Head-to-head
Takeshi Fujii	26W-20L	Head-to-head
Hiroyuki Miura	24W-17L	Head-to-head
Koichi Fukaura	21W-17L	Head-to-head
Kazuki Kimura	15W-19L	Head-to-head
Akira Watanabe	13W-21L	Head-to-head
Nobuyuki Yashiki	16W-17L	Head-to-head

Head-to-head with other players →