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 BC 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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(OC) 2007 the Authors, published under the OpenContent License V1.0.
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