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BeginnerExercise53

 

Beginner Exercise 53 Solution
  Difficulty: Beginner   Keywords: Problem

[Diagram]
White first to kill

Black can only get one eye out of the 2x2 space, unless Black can make two diagonal moves in there. After W1, Black must connect to live and also make an eye at a.


[Diagram]
White first to kill

If Black solidifies the eye at a first by playing at B2, that group has only two liberties and it's White's turn, so White wins the semeai (capturing race).


[Diagram]
White first to kill

If Black tries to capture first with B2, White attacks the eye at W3. Black cannot solidify the eye at a because of shortage of liberties, and if Black captures the two white stones, the eye becomes false when White plays at a.


[Diagram]
White's failure

This does not work. W3 is forced, to prevent Black getting two eyes directly by capturing at W3; and B4 solidifies the eye at a. White needs three moves to capture any black stones while Black needs only one to capture the inside white stones (and remove the aji - lingering aftereffects -, so White doesn't even have a ko threat here).





This is a copy of the living page "Beginner Exercise 53 Solution" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.