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Okan title games

This page gives the title games (in SGF format) for the Okan (王冠) title.

The Okan title is a 1-game match between the winner of a 12-player knockout tournament and the previous title holder. It is open only to players in the Nagoya branch of the Nihon Ki-in. It is held every year (but up to the 15th Okan, every year-and-a-half).

Komi was 4.5 up to 1974, 5.5 in 1975-2002, and 6.5 from 2003.

For the early years, no game records are available.

League

The first five editions it was a league.

# year winner
1 1953 Sakai Michiharu
2 1956 Iwata Tatsuaki
3 1957 Sakai Michiharu
4 1958 Iwata Tatsuaki
5 1959 Iwata Tatsuaki

Challenger tournament

From the 6th edition on, a knockout tournament was held to determine the title challenger.

# year winner loser
6 1960 Shimamura Toshihiro Isogawa Masao
7 1961 Shimamura Toshihiro Iwata Tatsuaki
8 1962 Shimamura Toshihiro Isogawa Masao
9 1964 Shimamura Toshihiro Isogawa Masao
10 1965 Shimamura Toshihiro Iwata Tatsuaki
11 1967 Iwata Tatsuaki Shimamura Toshihiro
12 1969 Iwata Tatsuaki Shimamura Toshihiro
13 1970 Iwata Tatsuaki Tsuchida Masamitsu
14 1972 Hane Yasumasa Iwata Tatsuaki
15 1974 Shimamura Toshihiro Hane Yasumasa
16 1975 Shimamura Toshihiro Hane Yasumasa
17 1976 Iwata Tatsuaki Shimamura Toshihiro
18 1977 Yamashiro Hiroshi Iwata Tatsuaki

Game records for the title games, starting at 1978.

# date winner loser #mv result sgf
19 1978-10-26 Hane Yasumasa Yamashiro Hiroshi 198 W+R sgf
20 1979-10-11 Iwata Tatsuaki Hane Yasumasa 265 B+5.5 sgf
21 1980-10-23 Iwata Tatsuaki Baba Shigeru 101 B+R sgf
22 1981-11-05 Yamashiro Hiroshi Iwata Tatsuaki 234 B+2.5 sgf
23 1982-10-21 Yamashiro Hiroshi Hane Yasumasa 205 B+R sgf
24 1983-11-24 Hane Yasumasa Yamashiro Hiroshi 172 W+R sgf
25 1984-11-22 Yamashiro Hiroshi Hane Yasumasa 168 W+R sgf
26 1985-11-21 Yamashiro Hiroshi Iwata Tatsuaki 195 B+R sgf
27 1986-11-20 Yamashiro Hiroshi Hane Yasumasa 205 B+R sgf
28 1987-11-12 Yamashiro Hiroshi Tsuchida Masamitsu 263 B+4.5 sgf
29 1988-12-08 Ogata Masaki Yamashiro Hiroshi 180 W+R sgf
30 1989-11-09 Ogata Masaki Iwata Tatsuaki 262 B+1.5 sgf
31 1990-11-02 Ogata Masaki Hane Yasumasa 172 W+R sgf
32 1991-11-07 Ogata Masaki Hane Yasumasa 232 W+R sgf
33 1992-11-05 Hane Yasumasa Ogata Masaki 190 W+R sgf
34 1993-11-10 Yamashiro Hiroshi Hane Yasumasa 242 B+0.5 sgf
35 1994-11-10 Yamashiro Hiroshi Ogata Masaki 246 W+1.5 sgf
36 1995-11-16 Yamashiro Hiroshi Hane Yasumasa 219 B+R sgf
37 1996-11-14 Yamashiro Hiroshi Hikosaka Naoto 206 W+0.5 sgf
38 1997-11-20 Nakano Hironari Yamashiro Hiroshi 253 B+3.5 sgf
39 1998-11-18 Nakano Hironari Yamashiro Hiroshi 176 W+R sgf
40 1999-10-19 Hane Naoki Nakano Hironari 144 W+R sgf
41 2000-11-20 Yamashiro Hiroshi Hane Naoki 213 B+R sgf
42 2001-11-21 Yamashiro Hiroshi Matsuoka Hideki 212 W+7.5 sgf
43 2002-11-14 Hane Naoki Yamashiro Hiroshi 220 W+2.5 sgf
44 2003-11-10 Hane Naoki Hikosaka Naoto 286 W+3.5 sgf
45 2004-11-17 Hane Naoki Yamashiro Hiroshi 175 B+R sgf
46 2005-11-28 Yamashiro Hiroshi Hane Naoki 283 B+R sgf
47 2006-11-27 Matsuoka Hideki Yamashiro Hiroshi 183 B+R sgf
48 2007-11-28 Hane Naoki Matsuoka Hideki 139 B+R sgf
49 2008-11-17 Hane Naoki Yamashiro Hiroshi 192 W+R sgf
50 2009-11-26 Hane Naoki Yamashiro Hiroshi 176 W+R sgf
51 2010-11-25 Yamashiro Hiroshi Hane Naoki 242 W+4.5 sgf
52 2011-11-16 Hane Naoki Yamashiro Hiroshi 299 B+5.5 sgf
53 2012-11-27 Hane Naoki Nakano Hironari 265 W+3.5 sgf
54 2013-11-29 Hane Naoki Nakano Hironari 237 B+R sgf
55 2014-11-29 Hane Naoki Yamashiro Hiroshi 198 W+R sgf
56 2015-12-04 Hane Naoki Ogata Masaki 150 W+R sgf
57 2016-11-16 Ida Atsushi Hane Naoki 245 B+R sgf
58 2017-11-13 Ida Atsushi Mutsuura Yuta 174 W+R sgf
59 2018-11-25 Ida Atsushi Nakano Hironari 252 W+2.5 sgf