Ear-reddening Game

    Keywords: Culture & History

The Ear-reddening Game, played in 1846[1] by Shusaku against Gennan Inseki is one of the most famous in go history, containing the ear-reddening move.

Table of contents Table of diagrams
Shusaku’s joseki mistake with proper move marked
The ear-reddening move
What Gennan should have played instead
What Gennan should have played instead?
Lizzie's choice
Lizzie's evaluation of the ear reddening move

Shusaku was 17 years old at the time of the game and 4 dan. Gennan on the other hand was close to 50 years old, an established 8 dan, and head of House Inoue. It was thus a great privilege for Shusaku to play Gennan. The first game was played with two stones handicap, but it became clear that Shusaku was too strong for that handicap.

In their second game Shusaku took Black. After making a mistake in the taisha joseki (see below) played in the lower right corner, Shusaku played well. Gennan had closed the no-komi gap however so the game was very close. The game continued to move 127, the famous ear-reddening move (below).

Eventually Shusaku won the game by 2 points after 325 moves, in spite of stubborn resistance by Gennan in a ko he “could not hope to win”[2] from move 229 to 311.

Shusaku’s Joseki Mistake

[Diagram]
Shusaku’s joseki mistake with proper move marked  

B2 is usually considered a mistake: Black should slide to a, White b, then Black c.[3] (If Black turns at d instead of extending to c, then Black will fall into a losing ladder.) This allowed Gennan to close the no-komi gap early in the game.



While no-komi Leela Zero[7] agrees[6] that B2 is an error, estimating a 5% reduction in win rate, this traditional judgement is not perhaps as clear-cut as it might seem. B2 has continued to appear off and on. Ch’oe Myeong-hun played it against Yi Ch’ang-ho in game 2 of the 3rd Ch’eonweon in 1998 and most recently Tang Weixing played it in the China Weiqi League in 2009.

The ear-reddening move

White had just played the marked stone white+circle as move 126, when Shusaku played B1. This move is known as the ear-reddening move. Gennan’s disciples were watching the game and not one of them doubted that Gennan would win. But a doctor, who also had been watching the game, thought that Gennan would lose. When pressed for an answer he replied: I don’t know much about the game, but when Shusaku played B1 Gennan’s ears flushed red. This is a sign that he had been upset. [2]

[Diagram]
The ear-reddening move  


B1 has different objectives. It expands Black’s moyo at the top, it helps the four black stones marked black+square[4], it reduces the influence of White’s strong position to the right, and it also has an eye on White’s moyo on the left side.

Gennan’s Mistake

White should probably have forced with 1 before 3. Black cannot allow White a so this would have prevented Black’s good move in the previous diagram. White can expect more profit from his attack now since his thickness is working more efficiently.

[Diagram]
What Gennan should have played instead  


[Diagram]
What Gennan should have played instead?  


Or perhaps Gennan should simply have secured territory in the top left corner. That is Elf's choice in the Elf GoGoD commentaries. It is not easy to use the bots to judge this position, because most of them assume 7.5 komi and in that case White has an easy win (but see the no-komi variant below).

Leela Zero analysis

Since the advent of strong bots, we are in a position to evaluate the quality of the move. As mentioned below, the AI programs do not really consider this move as a candidate and when force fed the move, evaluate it as less valuable than the more mundane candidates. In particular, Leela Zero gives the following analysis:

[Diagram]
Lizzie's choice  

Lizzie's choice is the second line stretch at B1 here. Without komi, she gives Black 57,7% chance of winning this way (51K play-outs). Other moves considered are the forcing peep at a, the push at b and the shoulder hit at c.

[Diagram]
Lizzie's evaluation of the ear reddening move  

When fed the ear reddening move, Lizzie executes an incidental forcing sequence on the right side, then plays the big point W6, which confirms her original choice for Black instead of the ear reddening move. She gives White 48,2% which boils down to a 5,9% decrease in Black's win rate when respect to the first diagram.



Dissenting Opinions

Yoda Norimoto

In a recent book [5] Yoda Norimoto, a top Japanese pro, published a commentary on this game. Yoda introduces the game as Shusaku’s most famous game. He goes on to say that in his opinion, although it is a fine game (rippa na), it is not so outstanding. Later in the game commentary, regarding the famous “ear reddening” move, Yoda quotes Go Seigen as saying that any first class pro would play something like that. Yoda concludes by saying that he doesn’t think this move is fantastically amazing.

Various AIs

Analysis assuming komi by several AI programs (Leela Zero 40 blocks, ELF V1, AA Master, Master 8A, Crazy Stone Deep Learning, Leela 11 Deep Learning, 5 block special network, but no AlphaGo variant): [ext] https://explorebaduk.com/2019/01/09/ai-analysis-ear-reddening-move/

  • They analyse the position before the move, and none of them come up with the ear-reddening move as next move, though the strongest, Leela Zero 40 Blocks Network 199, shows it as move 13 in a sequence starting at C18 (push on the top left).

No-komi variant of Leela Zero

An analysis[7] by a variant of Leela Zero[6] using komi 0 prefers the push at C18, and thinks the ear-reddening move lowers the win rate by 5.9%. It is summarized above. There's also a video [ext] https://youtu.be/9BVe6T4WEtE in Russian, by Alexander Dinerchtein where he uses LZ to analyze this position.


Notes & references

  • [2] John Power Invincible, the games of Shusaku Ishi Press, February 1982
  • In Hikaru no Go, episode 63, Hikaru read the kifu for this game and commented on Shusaku’s (Sai’s) genius.
  • [5] Yoda Norimoto Yoda Ryuu Naraberu dake de tsuyoku naru kogo meikyoku shuu, Mynavi, sixth edition, 2013, page 114. ISBN 978-4-8399-2876-6 (Japanese)

[1] The dates were 1846-09-11,14,25 {Koka 3-VII-21, 24, 25}.

[3] Note: Although the taisha joseki appears as early as 1705 in GoGoD, the variation here first appears only four months before this game. In that earlier appearance, Nakagawa Junsetsu played the extension at W1 in the diagram above against Shusaku, who answered with the same B2, pushing from behind. Shusaku won the earlier game - he held Black after all :) The “better” slide mentioned above does not enter history until 1929 when Inoue Ichiro played it against Hayashi Yutaro in the Oteai.

[4] A note in Invincible elaborates that due to the influence of the ear-reddening move, capturing the Black center stones is too small scale.

[6] [ext] https://www.reddit.com/r/cbaduk/comments/8wo1ni/new_approach_success_modification_of_lz_became/ describes a version of Leela Zero trained to work with variable komi.

[7] [ext] https://lifein19x19.com/viewtopic.php?p=233730#p233730 describes no-komi Leela Zero’s analysis of this game.


Ear-reddening Game last edited by PJTraill on October 16, 2019 - 23:59
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