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BeginnerExercise47

 

Beginner Exercise 47 Solution
  Difficulty: Beginner   Keywords: Problem

[Diagram]
White first to create a ko.

splice: W1 creates a ko. Black cannot respond at a because of shortage of liberties. Any response that does not threaten W1 (except b, discussed below) will capture the two black stones at the right in a snapback (White b, Black a, White b).


[Diagram]
Possible

B2 connects and W3 sets up the ko. Black must take the ko, lose the four stones at the bottom, or connect them and lose the whole group. Ko it is :0


[Diagram]
Possible too

Straightforward ko sequence.



har1s?: I don't see any profit for White: Black still creates two eyes anyway?

HolIgor: In the last diagram White threatens to capture four black stones and Black cannot connect. Black cannot capture W3 back because of ko rule. The only solution is to make a large threat elsewhere, which sets up a ko. Black is better off in the second diagram, because White has to look for a ko threat first (try to get first capture in a ko).



This is a copy of the living page "Beginner Exercise 47 Solution" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.