Beginner Exercise 18 / Solution

Sub-page of BeginnerExercise18

Solution

[Diagram]

Solution

The only solution for Black to save himself is to fight the ko at a with B1.



Analysis of ko

[Diagram]

If Black wins the ko

If Black wins the ko at a by capturing at B1, he lives.

[Diagram]

If Black loses the ko

If Black loses the ko, the White connects at W1, creating a dead shape and thereby kills the entire Black group.

[Diagram]

If Black loses the ko

Even if Black gets to play the black+circle stones to expand the eye space to the maximum, Black is still dead. If Black actually played at a, then Black dies with a farmer's hat dead shape. Otherwise, White can almost fill the Black group with a bulky five dead shape by playing at a.



Failure

[Diagram]

Failure

If B1, then W2 kills. See the analysis of ko section above for the reason.

[Diagram]

Failure

Similarly, if B1 here, W2 kills.

[Diagram]

Failure

Same thing. This shows that W2 is a vital point for White for the kill.

[Diagram]

Failure

B1 is a mistake, and W2 kills by turning the group into a bent three dead shape.



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