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BeginnerExercise12

 

Beginner Exercise 12 Solution
  Difficulty: Beginner   Keywords: Problem

Solution by lavalyn 17k:

[Diagram]
An odd looking first move.

This is the killing move. Black prevents making an efficient eye at the corner - and makes miai of the kill at a and b.

For those who can't bear to see so many throw-ins, here are the complete diagrams:


[Diagram]
White makes the eye - 5 at the marked point.

[Diagram]
White captures the stone.

Maybe I'm not as bad at tsumego as I thought...



unkx80 adding failure diagrams again.

But first, I shall say that there are two ways to tackle a life and death problem of killing a group with a large eye space.

  1. Reduce the eye space until it is small enough to be killed.
  2. Hit the vital point inside the eye space.

For this problem, 1 doesn't work, as shown below. So the solution is to apply 2.

[Diagram]
Failure.

Attempting to reduce the eye space will not work.


[Diagram]
Failure.

Subsequently, a and b are miai, so White lives.



KarlKnechtel: So it seems. :) Though, doing tsumego and solving the problems in an actual game are different matters, at least for me. For big battles where the goal is to connect or to cut an opponent's connection, I seem to do fairly well for my strength, and I'm all right at destroying eyespace and making good shape. But I have a horrible time of it when the group whose life is in question is isolated; if it's mine, I'll misjudge it as already alive in sente, and if it's the opponent's, I'll mistime or mislocate my placement or throw-in.

Actually, my first experience with Go was tsumego problems - very easy ones, only one move needed to be made. They were a small puzzle game on a MUD that I played when I was 13. There was this "go player" mob in one of the rooms, and a copy of the rules for Go (which you could 'get' and 'read'), and from that you were supposed to infer the idea of two eyes. Then you would talk to the player, and he would set up a position on the board, and you would 'suggest' a move to him. Of course you could just guess randomly until you got it, although there were a handful of problems (probably 5 or so); but I got the idea that way.

Here's a puzzle that occurred to me this morning: EggsInABasketProblem. Not really a tsumego problem in the traditional sense, but it should be interesting to work out anyway. I don't have the answer, but it shouldn't be too hard to work out. Maybe it is already recorded in theoretical knowledge. :)



This is a copy of the living page "Beginner Exercise 12 Solution" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.