Xuanxuan Qijing Problem 224 / Solution

If you are not familiar with this shape please look at Flying Saucer Shape and Two Space Notchers Not Fully Connected.

[Diagram]

Solution

Unlike the Flying Saucer Shape, black is unable to make atari with 'a'. Next, white plays 'x' or 'y' to make two eyes.



Related Problem

[Diagram]

White to play

It is important to recognize the feature rather than the exact shape. For example, this problem is exactly the same in the sense that it's based on the idea that black is unable to play at 'a'.


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