Players › Koji Tosa

Koji Tosa

Player No.	124
Rank	8-dan
Date of birth	Mar 30, 1955
Birthplace	Niigata
Teacher	Shizuo Seino 8-dan (deceased)

Junisen terms40

Career record196W-204L

Win rate0.490

Deviation score (FY2016)23.4

Best deviation score62.1
FY1981

Rating history and all games →

Junisen record

Term	Class	Rank	Record	Up/down	Deviation
75th term	Class C2	40	0W-10L	Demerit	23.4
74th term	Class C2	30	3W-7L	Demerit	34.7
73rd term	Class C2	2	4W-6L		40.3
72nd term	Class C1	27	3W-7L	Relegated	36.0
71st term	Class C1	32	3W-7L		34.8
70th term	Class C1	1	2W-8L	Demerit	40.9
69th term	Class B2	24	3W-7L	Relegated	41.3
68th term	Class B2	16	3W-7L	Demerit	40.0
67th term	Class B2	3	4W-6L		39.2
66th term	Class B2	17	7W-3L	Demerit cleared	47.6
65th term	Class B2	22	4W-6L		43.2
64th term	Class B2	3	2W-8L	Demerit	34.9
63rd term	Class B2	18	8W-2L		44.5
62nd term	Class B2	9	3W-7L		41.4
61st term	Class B2	5	5W-5L		43.9
60th term	Class B2	14	7W-3L		52.1
59th term	Class B2	12	4W-6L		45.7
58th term	Class B2	8	4W-6L		41.0
57th term	Class B2	12	6W-4L		58.5
56th term	Class B2	3	4W-6L		47.7
55th term	Class B2	3	8W-2L		53.3
54th term	Class B2	9	7W-3L		53.5
53rd term	Class B2	17	6W-4L	△→cleared	52.6
52nd term	Class B2	13	3W-7L	△	52.3
51st term	Class B2	21	5W-5L	△	49.3
50th term	Class B2	5	3W-7L	Demerit	48.8
49th term	Class B2	22	7W-3L		57.0
48th term	Class C1	15	8W-2L	Promoted	61.1
47th term	Class C1	4	3W-7L		46.8
46th term	Class C1	6	7W-3L		53.9
45th term	Class C1	12	7W-3L		59.4
44th term	Class C1	22	6W-4L	△→cleared	55.1
43rd term	Class C1	21	2W-8L	Demerit	47.2
42nd term	Class C2	7	8W-2L	Promoted	55.7
41st term	Class C2	7	6W-4L		50.1
40th term	Class C2	2	6W-4L		62.1
39th term	Class C2	7	7W-3L		50.2
38th term	Class C2	7	6W-4L		52.0
37th term	Class C2	9	6W-4L		52.6
36th term	Class C2	21	6W-4L		49.2

How the deviation score is calculated: see here.

Terms in each class

Class B2	21 terms
Class C1	9 terms
Class C2	10 terms

Promotion history

Sep 18, 2014	8-dan
Jul 25, 1997	7-dan
Apr 14, 1989	6-dan
Apr 1, 1984	5-dan
Feb 19, 1976	4-dan
1973	1-dan

Career win milestones

100 wins	Feb 12, 1981 Oi-sen
200 wins	Apr 5, 1985 Shinjin-o-sen
300 wins	Feb 14, 1989 Ryuo-sen
400 wins	Mar 26, 1994 Kio-sen
500 wins	Mar 23, 2001 Osho-sen
600 wins	Nov 1, 2011 Junisen

Best wins (highest-rated opponents)

Feb 6, 1999	Koji Tanigawa 1952	Hayazashi-sen
Apr 14, 1981	Kunio Yonenaga 1922	Oi-sen
Feb 20, 1999	Toshiyuki Moriuchi 1894	Hayazashi-sen
Aug 23, 2002	Kazuki Kimura 1889	Junisen
Sep 25, 1992	Yasumitsu Satoh 1885	All-Japan Pro

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

Masaki Izumi	13W-14L	Head-to-head
Hiroshi Kamiya	10W-12L	Head-to-head
Hifumi Katoh	12W-9L	Head-to-head
Kenji Iino	12W-6L	Head-to-head
Torahiko Tanaka	7W-10L	Head-to-head
Hatasu Itou	9W-7L	Head-to-head
Eisaku Tomioka	9W-7L	Head-to-head
Toshio Miyata	7W-8L	Head-to-head
Yoshiyuki Ueyama	9W-6L	Head-to-head
Koji Horiguchi	7W-8L	Head-to-head
Nobuyuki Oouchi	6W-8L	Head-to-head
Kazuyoshi Nishimura	6W-8L	Head-to-head

Head-to-head with other players →