Xuanxuan Qijing Problem 19 / Solution

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Solution

Note that this solution only works because the marked black stones have no outside liberties (W7 puts them into atari and black has no time to play at W9).


Additional Problems

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Related #1

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Related #2

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Related #3


Additional Problem Solutions

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Solution for #1

If black plays 'a' this is revert to the original problems, and it's wrong. The best black can do is B1 here. More information at long L group; it's alive in seki.

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Solution for #2

B1 here is correct. 'a' would make black alive too, but only in seki; when black plays B1 the group lives with points.

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Solution for #3

In a situation like this the best black can do is get a ko with B1 here. More information at long L group. If you have been looking at this page carefully, it's obvious 'a' doesn't work for black.


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