Weak rectangular six in the corner

  Difficulty: Beginner   Keywords: Life & Death
[Diagram]

Weak 6

If in the Rectangular six in the corner the corner point white+circle is white, the shape is a bit weaker.

Black can live with 5 points of territory by playing at a.

What white can do depends on the number of outside liberties.

[Diagram]

Kill

In case the short side has no outside liberties, it's straightforward.

[Diagram]

Kill

When the long side has no outside liberties, then W1 still kills.

[Diagram]

Kill

When both have an outside liberty, W1 no longer works

[Diagram]

Ko

And it's a ko


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