Beginner Exercise 73 / Solution

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[Diagram]

Solution

B1, separating the eyespace into two, is the only way to live.

[Diagram]

Proof 1

White's invasion fails.

[Diagram]

Proof 2

Low invasion also fails.

[Diagram]

Proof 3

Simply blocked (Best for White.)


[Diagram]

Failure

Enlarging the eyespace make it a bulky five, so W2 kills - a and b are miai for kill now. W2 is exactly the point B1 in the solution diagram.

Generally, expand the eyespace to the maximum and see how the opponent can kill - then apply the proverb "The enemy's key point is yours". This method often provide a good hint to find the solution, as in this exercize.



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