RTG Problem 20 / Solution

Sub-page of RTGProblem20

Solution

[Diagram]

Solution 1

The solution is a ko.

[Diagram]

Continuation (i)

B2 at black+circle, W3 at black+square, B4 at black+circle

If White chooses to capture the snapback stones instead...

[Diagram]

Continuation (ii)

We see that after W1, Black lives as White will not be able to play at a.

[Diagram]

Solution 2

White also has this response.

If White loses the ko, this is better because Black will not have played at a.

If White wins the ko, White will connect at black+circle, creating a false seki, whith the outside Black stones dead. The result is the Solution 1 diagram.

So in terms of points, this is better for White than the Solution 1 diagram above. However, the other way gives White a local ko threat by capturing the two Black stones as in the Continuation (i) diagram. If that threat is crucial, then the other way is better.

[Diagram]

Variation

If W2, then B3 makes W4 and B5 miai.



Failure

[Diagram]

Failure

Why is B1 a failure? See Snapback Problem 16.


Authors


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