Cho's Intermediate #46

Talk about improving your game, resources you like, games you played, etc.
Post Reply
Cynosure
Dies in gote
Posts: 36
Joined: Tue Jan 06, 2015 8:21 am
Rank: KGS 5 kyu
GD Posts: 0
Universal go server handle: Cynosure
Been thanked: 1 time

Cho's Intermediate #46

Post by Cynosure »

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]
User avatar
Solomon
Gosei
Posts: 1848
Joined: Tue Apr 20, 2010 9:21 pm
Rank: AGA 5d
GD Posts: 0
KGS: Capsule 4d
Tygem: 치킨까스 5d
Location: Bellevue, WA
Has thanked: 90 times
Been thanked: 835 times

Re: Cho's Intermediate #46

Post by Solomon »

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]
Richard Hunter
Dies in gote
Posts: 27
Joined: Sat Feb 28, 2015 10:28 am
Rank: BGA 1 dan
GD Posts: 0
Location: UK
Has thanked: 23 times
Been thanked: 46 times

Re: Cho's Intermediate #46

Post by Richard Hunter »

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.
Cynosure
Dies in gote
Posts: 36
Joined: Tue Jan 06, 2015 8:21 am
Rank: KGS 5 kyu
GD Posts: 0
Universal go server handle: Cynosure
Been thanked: 1 time

Re: Cho's Intermediate #46

Post by Cynosure »

... 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.
Richard Hunter
Dies in gote
Posts: 27
Joined: Sat Feb 28, 2015 10:28 am
Rank: BGA 1 dan
GD Posts: 0
Location: UK
Has thanked: 23 times
Been thanked: 46 times

Re: Cho's Intermediate #46

Post by Richard Hunter »

In Solomon's second diagram, B3 at F19 is better at F17.
Bill Spight
Honinbo
Posts: 10905
Joined: Wed Apr 21, 2010 1:24 pm
Has thanked: 3651 times
Been thanked: 3373 times

Re: Cho's Intermediate #46

Post by Bill Spight »

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.
macelee
Lives in sente
Posts: 928
Joined: Mon Dec 31, 2012 1:46 pm
Rank: 5 dan
GD Posts: 0
KGS: macelee
Location: UK
Has thanked: 72 times
Been thanked: 480 times
Contact:

Re: Cho's Intermediate #46

Post by macelee »

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.
User avatar
Cassandra
Lives in sente
Posts: 1326
Joined: Wed Apr 28, 2010 11:33 am
Rank: German 1 Kyu
GD Posts: 0
Has thanked: 14 times
Been thanked: 153 times

Re: Cho's Intermediate #46

Post by Cassandra »

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)
Krama
Lives in gote
Posts: 436
Joined: Mon Jan 06, 2014 3:46 am
Rank: KGS 5 kyu
GD Posts: 0
Has thanked: 1 time
Been thanked: 38 times

Re: Cho's Intermediate #46

Post by Krama »

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.

DrStraw
Oza
Posts: 2180
Joined: Tue Apr 27, 2010 4:09 am
Rank: AGA 5d
GD Posts: 4312
Online playing schedule: Every tenth February 29th from 20:00-20:01 (if time permits)
Location: ʍoquıɐɹ ǝɥʇ ɹǝʌo 'ǝɹǝɥʍǝɯos
Has thanked: 237 times
Been thanked: 662 times
Contact:

Re: Cho's Intermediate #46

Post by DrStraw »

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).
Krama
Lives in gote
Posts: 436
Joined: Mon Jan 06, 2014 3:46 am
Rank: KGS 5 kyu
GD Posts: 0
Has thanked: 1 time
Been thanked: 38 times

Re: Cho's Intermediate #46

Post by Krama »

DrStraw.. thank you!

Haha, this move is golden :D
User avatar
Cassandra
Lives in sente
Posts: 1326
Joined: Wed Apr 28, 2010 11:33 am
Rank: German 1 Kyu
GD Posts: 0
Has thanked: 14 times
Been thanked: 153 times

Re: Cho's Intermediate #46

Post by Cassandra »

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)
Post Reply