Xuanxuan Qijing Problem 13 / Solution

[Diagram]

Solution is approach ko.

The best solution for both players is to give White an approach ko, enabled by the throw-in of W3.


[Diagram]

Black captures throw-in.

If Black captures the throw-in, then White can get another, better ko (see "Black chooses 'a' 1" & "Black chooses 'a' 2").

[Diagram]

Cont. W1-W5

White exchanges W1 for B2 and then performs the key probe of W5. Black's reply at a, b, and c will be demonstrated.

[Diagram]

Black chooses 'a' 1.

B7 @ 4. White makes a ko.

[Diagram]

Black chooses 'a' 2.

White still makes ko.

[Diagram]

Black chooses 'a' 3.

White lives unconditionally.

[Diagram]

Black chooses 'b' 1.

White lives unconditionally.

[Diagram]

Black chooses 'c' 1.

White lives unconditionally.


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