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Offline Cynosure
 Post subject: Cho's Intermediate #46
Post #1 Posted: Sat Mar 19, 2016 11:50 pm 
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Hi y'all,

I'm working through Cho's Encyclopedia of Life and Death as transcribed onto tasuki. This is problem 46 in the second volume; black to play and kill. I can't find the correct variation, if there is one (supposedly there are some incorrect transcriptions). Halp, please?

Click Here To Show Diagram Code
[go]$$B
$$ | -------------------
$$ | . . . . . . . . . .
$$ | O O O O . O X . X .
$$ | . X . X . . X . . .
$$ | . X . X . X . . . .
$$ | . . . . . . . . . .[/go]

This post by Cynosure was liked by: Anzu
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Offline Solomon
 Post subject: Re: Cho's Intermediate #46
Post #2 Posted: Sun Mar 20, 2016 12:08 am 
Gosei
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Click Here To Show Diagram Code
[go]$$B
$$ | -------------------
$$ | . 1 2 . 3 4 . . . .
$$ | O O O O 5 O X . X .
$$ | . X . X 6 7 X . . .
$$ | . X . X . X . . . .
$$ | . . . . . . . . . .[/go]


Click Here To Show Diagram Code
[go]$$B
$$ | -------------------
$$ | . 1 5 . 4 3 . . . .
$$ | O O O O . O X . X .
$$ | . X . X 2 . X . . .
$$ | . X . X . X . . . .
$$ | . . . . . . . . . .[/go]


Click Here To Show Diagram Code
[go]$$B
$$ | -------------------
$$ | . 1 . . . 2 . . . .
$$ | O O O O 3 O X . X .
$$ | . X . X 4 5 X . . .
$$ | . X . X . X . . . .
$$ | . . . . . . . . . .[/go]
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Offline Richard Hunter
 Post subject: Re: Cho's Intermediate #46
Post #3 Posted: Sun Mar 20, 2016 12:08 am 
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Cynosure,

It looks correct and solvable to me.

The first two principles of life and death are:
1. Reduce the eye space from the outside.
2. Play at the vital point.

It is usual to try 1 first, and if that does not work, try 2.

Ha! Someone posted the answer at exactly the same time as my post.
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Offline Cynosure
 Post subject: Re: Cho's Intermediate #46
Post #4 Posted: Sun Mar 20, 2016 12:10 am 
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... I literally tried every point but that one :sad:
Well, I suppose that's why I'm practicing!

And thank you Richard, I'll keep that in mind as I continue through the series.
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Offline Richard Hunter
 Post subject: Re: Cho's Intermediate #46
Post #5 Posted: Sun Mar 20, 2016 12:15 am 
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In Solomon's second diagram, B3 at F19 is better at F17.
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Offline Bill Spight
 Post subject: Re: Cho's Intermediate #46
Post #6 Posted: Sun Mar 20, 2016 3:16 am 
Honinbo

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Cynosure wrote:
... I literally tried every point but that one


This failed attempt gives a clue about where to play. :)

Click Here To Show Diagram Code
[go]$$B
$$ | -------------------
$$ | . 8 . 6 1 2 . . . .
$$ | O O O O 3 O X . X .
$$ | . X . X 4 5 X . . .
$$ | . X . X . X . . . .
$$ | . . . . . . . . . .[/go]

:b7: at 3.

As does this one.

Click Here To Show Diagram Code
[go]$$B
$$ | -------------------
$$ | . 3 . 2 1 4 . . . .
$$ | O O O O . O X . X .
$$ | . X . X . . X . . .
$$ | . X . X . X . . . .
$$ | . . . . . . . . . .[/go]

_________________
The Adkins Principle:
At some point, doesn't thinking have to go on?
— Winona Adkins

Visualize whirled peas.

Everything with love. Stay safe.
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Offline macelee
 Post subject: Re: Cho's Intermediate #46
Post #7 Posted: Sun Mar 20, 2016 3:29 am 
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Remember the attacking point which you will see again and again. If reducing eye space doesn't work, the next level of attack is always this kind of move.
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Offline Cassandra
 Post subject: Re: Cho's Intermediate #46
Post #8 Posted: Sun Mar 20, 2016 4:01 am 
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Click Here To Show Diagram Code
[go]$$B
$$ | -------------------
$$ | C C C . . . . . . .
$$ | O O O O . O X . X .
$$ | . X . X . . X . . .
$$ | . X . X . X . . . .
$$ | . . . . . . . . . .[/go]

White's potential eye space consists of three points.

Click Here To Show Diagram Code
[go]$$B
$$ | -------------------
$$ | T T T . . . . . . .
$$ | O O O O . O X . X .
$$ | . X . X . . X . . .
$$ | . X . X . X . . . .
$$ | . . . . . . . . . .[/go]

At the left, there is a dead three-point eye shape visible, which central point is still unoccupied.

Click Here To Show Diagram Code
[go]$$B
$$ | -------------------
$$ | C C C C C . . . . .
$$ | O O O O . O X . X .
$$ | . X . X . . X . . .
$$ | . X . X . X . . . .
$$ | . . . . . . . . . .[/go]

White's maximum potential eye space consists of five points.

Click Here To Show Diagram Code
[go]$$B
$$ | -------------------
$$ | . . . . . ? . . . .
$$ | O O O O ? O X . X .
$$ | . X . X . . X . . .
$$ | . X . X . X . . . .
$$ | . . . . . . . . . .[/go]

But (1): There are two holes in White's encirclement.

Click Here To Show Diagram Code
[go]$$B
$$ | -------------------
$$ | . . . . . M . . . .
$$ | O O O O M O X . X .
$$ | . X . Z . . X . . .
$$ | . X . X . X . . . .
$$ | . . . . . . . . . .[/go]

But (2): There is a line of false eyes at the right.

However, it needs permanent stones on BOTH ends of such a line to make it work.

Click Here To Show Diagram Code
[go]$$B
$$ | -------------------
$$ | . . . . . . . . . .
$$ | O O O O M O X . X .
$$ | . X . Z . M X . . .
$$ | . X . X . X . . . .
$$ | . . . . . . . . . .[/go]

But (3): Yet another line of false eyes at the right.

Click Here To Show Diagram Code
[go]$$B
$$ | -------------------
$$ | C C C C . . . . . .
$$ | O O O O . O X . X .
$$ | . X . X . . X . . .
$$ | . X . X . X . . . .
$$ | . . . . . . . . . .[/go]

Do not let your opponent turn their potential eye space into a long line of points.

Click Here To Show Diagram Code
[go]$$B
$$ | -------------------
$$ | C C C . C . . . . .
$$ | O O O O . O X . X .
$$ | . X . X . . X . . .
$$ | . X . X . X . . . .
$$ | . . . . . . . . . .[/go]

Do not let your opponent divide their potential maximum eye space.

Click Here To Show Diagram Code
[go]$$B
$$ | -------------------
$$ | T T T . C . . . . .
$$ | O O O O . O X . X .
$$ | . X . X . . X . . .
$$ | . X . X . X . . . .
$$ | . . . . . . . . . .[/go]

Especially, if you leave a dead eye shape behind, which central point can be occupied by your opponent.

_________________
The really most difficult Go problem ever: https://igohatsuyoron120.de/index.htm
Igo Hatsuyōron #120 (really solved by KataGo)

This post by Cassandra was liked by 2 people: Bill Spight, xed_over
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Offline Krama
 Post subject: Re: Cho's Intermediate #46
Post #9 Posted: Mon Mar 21, 2016 6:55 am 
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While we are at this, could someone help me solve this one?

I kinda know what needs to be done but I can't find the tesuji to prevent white from approaching the black corner group right away.
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Offline DrStraw
 Post subject: Re: Cho's Intermediate #46
Post #10 Posted: Mon Mar 21, 2016 7:22 am 
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Krama wrote:
While we are at this, could someone help me solve this one?

I kinda know what needs to be done but I can't find the tesuji to prevent white from approaching the black corner group right away.


O19

_________________
Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).
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Offline Krama
 Post subject: Re: Cho's Intermediate #46
Post #11 Posted: Mon Mar 21, 2016 7:46 am 
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DrStraw.. thank you!

Haha, this move is golden :D
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Offline Cassandra
 Post subject: Re: Cho's Intermediate #46
Post #12 Posted: Mon Mar 21, 2016 8:01 am 
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Think twice before giving atari !

In tsume-go, this advice usually applies for the first move of the solution sequence.

+ + + + +

And also mind the lines of false eyes.

_________________
The really most difficult Go problem ever: https://igohatsuyoron120.de/index.htm
Igo Hatsuyōron #120 (really solved by KataGo)
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