Beginner Exercise 143 / Solution

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Solution

[Diagram]

Solution

White has two effective sente moves (called kiki in Japanese), a and b, against the Black corner. W1 ensures connection or ko for kill in the corner against any Black try. For example....


[Diagram]

Black try 1

Against B1, W2 makes a and b miai. This also works against B1 at a or c.

[Diagram]

Ko for life for both sides

Though Black takes first, White has good local ko threats at a and b.

[Diagram]

Black try 2

B1 here can't prevent connection.

[Diagram]

Black try 3 (B9 at B1)

This is not ko.


Faillure

[Diagram]

Total Failure

W1 can't connect.

[Diagram]

Big loss

W1 is better than above, but B2 is a big endgame play anyway. Black can later invade as far as a. As a general rule, keep powerful sente moves for later use for flexibility.



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