Pro-Am Honinbo Match

    Keywords: Tournament

Each year since 1963, the Mainichi Shinbun (the newspaper sponsor of the Honinbo tournament) has hosted a game between the reigning professional Honinbo and the year's amateur Honinbo.

The first match in 1963 was played by Harada Minoru (a 5d amateur at the time) and Sakata Eio 9p. The handicap was 2 stones, no komi. The handicap changed erratically during the first 26 terms[1] and the amateurs went 9 in 26. After that, starting in 1989, the handicap has been adjusted regularly and has varied from a minimum of the amateur just taking black with -5 komi to an enormous 3 stones and -2.5 komi that Harada (again, 34 years later!?) received 1997 against Cho Chikun (and lost).

However, Iwai Ryuichi may have started a trend to lower that handicap, winning against O Meien in 2000 with a mere 2 stones and -5 komi.

Amateurs would of course love to be able to get the handicap back down to just playing black with komi.

Winners of the amateur Honinbo title (not this match) are now automatically awarded 8-dan diplomas.

Handicap System

The handicap in the game changes each year based on the previous year's results.

There are five incremental komi changes:

  • Black gives 5.0 points komi (jigo is possible)
  • Black gives 2.5 points komi
  • No komi (jigo is possible)
  • Black receives 2.5 points komi
  • Black receives 5.0 points komi (jigo is possible)

A loss by Black steps down this scale (komi decreases) in the next game while a win steps up this scale (komi increases). If Black wins while giving 5.0 points komi, the number of handicap stones decreases by one. If Black loses while receiving 5.0 points komi, the number of handicap stones increases by one. In both those cases, komi is reversed (treating each handicap stone as equivalent to 12.5 points komi). All steps from round to round increase or decrease.[1] In 2001 the amateur Honinbo lost on two stones receiving 2.5 points komi, so in 2002 Black placed two stones and received 5.0 points komi.

Results since 1989

Results since 1989
Years Pro Amateur Handicap Result
1989 Cho Chikun Harada, 原田実 H0 -5 Jigo
1990 Cho Chikun Nakazono 中園清三 H0 -5 Pro
1991 Cho Chikun Tanaka, 田中正人 H2 -2.5 Pro
1992 Cho Chikun Nakazono 中園清三 H2 +0 Pro
1993 Cho Chikun Hirata, 平田博則 H2 +2.5 Pro
1994 Cho Chikun Takano, 高野英樹 H2 +5 Pro
1995 Cho Chikun Nakazono 中園清三 H3 -2.5 Ama
1996 Cho Chikun Muraoka, 村岡利彦 H2 +5 Pro
1997 Cho Chikun Harada, 原田実 H3 -2.5 Pro
1998 Cho Chikun Tanaka, 田中正人 H3 Ama
1999 Cho Sonjin Miura 三浦浩, H3 -2.5 Ama
2000 O Meien Iwai 岩井竜一 H2 +5 Ama
2001 O Meien Komori, 小森祥嗣 H2 +2.5 Pro
2002 Kato Masao Kojima Ichiro 鮫島一郎 H2 +5 Ama
2003 Cho U Harada H2 +3 jigo
2004 Cho U Tanaka Nobuhiro H2 -3 Pro
2005 Takao Shinji Hiraoka Satoshi H2 -6 Ama
2006 Takao Shinji 村上深 (Murakami) 二子3目コミもらい Ama
2007 Takao Shinji 瀧澤雄太 二子 (H2) Pro
2008 Hane Naoki 洪マルグンセム 二子3目コミもらい Ama
2009 Hane Naoki Hong Mal Eun Saem 二子 (H2) Ama
2010 Yamashita Keigo 柳慎桓 二子3目コミ出し Ama
2011 Yamashita Keigo 中園清 先6目コミもらい Ama
2012 Iyama Yuta 平岡聡 先3目コミもらい Pro
2013 Iyama Yuta 洪奭義 先6目コミもらい Ama
2014 Iyama Yuta 洪奭義 先3目コミもらい Pro
2015 Iyama Yuta Shibano Ryunosuke (pro from 2017) 先6目コミもらい Pro
2016 Iyama Yuta 大関稔 二子3目コミ出し Pro
2017 Iyama Yuta 林隆羽 (Hayashi) 二子 (H2) Pro
2018 Iyama Yuta 平岡聡 二子3目コミもらい Ama

Japanese Wikipedia has a complete list (in Japanese of course) on its [ext] Amateur Honinbo page.

[1] Bob McGuigan: The handicap system seems to have been instituted for the 1989 term. According to the Japanese go yearbook the handicap varied quite a bit in the early years and there does not appear to have been a formula. In 1965 Black received 5 points komi (Kikuchi beat Sakata); in 1971 Miura lost to Ishida with two stones but in 1972 Kikuchi lost to Ishida with only 3.5 reverse komi. It moved around thereafter reaching a low of 3.5 reverse komi and occasionally going up to 2 stones or a little more. Pre-1989 highlights for the amateurs include Kikuchi's defeat of Sakata with 5 point reverse komi, his defeat of Rin Kaiho with 4.5 reverse komi and Nakazono defeating Takemiya with 5 points reverse komi in 1985 and 1987. The amateurs had a 12 game losing streak from 1970 through 1981.

Pro-Am Honinbo Match last edited by bugcat on October 6, 2021 - 01:24
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