Life In 19x19

Posted: **Sat Mar 19, 2016 11:50 pm**

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]

Posted: **Sun Mar 20, 2016 12:08 am**

Posted: **Sun Mar 20, 2016 12:08 am**

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.

Posted: **Sun Mar 20, 2016 12:10 am**

... 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.

Posted: **Sun Mar 20, 2016 12:15 am**

In Solomon's second diagram, B3 at F19 is better at F17.

Posted: **Sun Mar 20, 2016 3:16 am**

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]

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]

Posted: **Sun Mar 20, 2016 3:29 am**

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.

Posted: **Sun Mar 20, 2016 4:01 am**

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.

Posted: **Mon Mar 21, 2016 6:55 am**

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.

Posted: **Mon Mar 21, 2016 7:22 am**

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.

(;GM[1]FF[4]CA[UTF-8]SZ[19]AB[qa][qb][rb][sb][qc][pd][od][nd][nc][ja][jb][jc][kc][lc]AW[qd][rd][pe][qf][pc][oc][pb][oa][nb][mb][lb][kb])

Posted: **Mon Mar 21, 2016 7:46 am**

DrStraw.. thank you!

Haha, this move is golden

Posted: **Mon Mar 21, 2016 8:01 am**

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.

Life In 19x19

Cho's Intermediate #46

Cho's Intermediate #46

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