Beginner Exercise 17 / Solution

Sub-page of BeginnerExercise17
[Diagram]

White creates a ko

The solution is to hane at W1; Black has to play B2 in order to make two eye shapes; the throw-in at W3 then starts the ko. This is a two-stage ko that is favourable for Black - White needs three moves (W3, a and connect) to resolve it.

(Note on ko rules: In such a throw-in ko, Black can play B4 immediately because it doesn't repeat a past position. White needs to play a ko threat before recapturing at W3.)


[Diagram]

Black's squeamishness punished

If Black tries to avoid the ko, he'll just die outright.

[Diagram]

White's misstep

If White plays on the top first, Black will just hane and make two eyes (White can't play at a because Black will immediately capture).



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