Life and Death: Common Shapes in the Corner

1. 3-3 invasion under a star point

Black’s descend at G19 is sente.

1

Black can kill the corner if white tenuki.

2

2. 3-3 invasion under a 4-4 large knight enclosure

This descend is sente.

3

4

3. 3-3 invasion under a 4-4 large knight enclosure

This descend is sente.

5

This is a multi-step ko for black.

6

4.

The order of white 1 and 3 can be reversed. With D19, black can kill white.

7

8

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