kills.

Black has an eye in gote by playing at x.

In a situation like this, Black has 2 choices.

• Secure the gote eye with at x.

In this case at r kills.

• Find the moves that if White reponds at x, Black can still make two eyes.

a and b are the only two moves that makes two eyes on the top, so those are what we try for .

Resistance 'a'

Black can't make two eyes.

Resistance 'b'

After , there is only a gote eye on the top.

Black r / white s exchange doesn't help.

tenuki.