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BeginnerExercise3

 

Beginner Exercise 3 Solution
  Difficulty: Beginner   Keywords: Problem

[Diagram]
Diag.: Solution.

This exercise uses the concept of miai.

Black 1 is the only way to live, which makes White 2 and Black 3 miai. That is, if White plays at 2, Black lives with 3; if White plays at 3 instead, Black lives with 2. The concept of miai is such that there are two more or less equivalent points, so each player will get either one.


[Diagram]
Diag.: Reference.

In solving this exercise, this reference diagram is also very useful. It is the same as the problem except with the two marked stones added, so it becomes a basic T-shaped four-space big eye (Farmer's Hat), where the point a is the vital point. If White plays at a, Black is killed; if Black plays at a Black lives.


[Diagram]
Diag.: Failure.

With the reference diagram it becomes easy to explain why enlarging the eye space at 1 fails. Even though there is no stone at a, the concept is still the same. So White 2 kills the black group.

I leave it as an exercise for the reader to see what happens if Black plays his first move at a instead.



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This is a copy of the living page "Beginner Exercise 3 Solution" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.