Beginner Exercise 190 / Solution

Sub-page of BeginnerExercise190
[Diagram]

White kills marked black stones

The black+circle stones are not invincible because of the white+square white stone.

After W5, black can't save the marked stones from being retaken at W1.

If B1, then a play at the circled point catches a connect-and-die.

unkx80: Good!


[Diagram]

How to answer B2?

unkx80: To make the discussion more complete, consider how to answer B2?

[Diagram]

smaller capture

W3 at B4 would save the white+circle stones in the original problem by capturing the black+circle stones and sacrificing white+square.

However, the shown variation could work (?) if there's no ladder-breaker waiting in that direction.



Niklaus: There is no need to worry about ladder breakers:

[Diagram]

Shorter ladder

[Diagram]

Not a ladder

unkx80: Niklaus is right. Further, the sequence shown is not a ladder at all. This can be seen after B8, which captures the W1 stone and makes an atari on the W5 stone.



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(OC) 2012 the Authors, published under the OpenContent License V1.0.
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