|Table of diagrams
Threat to connect under, then cut
Double snapback (W13 @ WW)
Best response by Black
Bass's attempt: sente eye on the left
White threatens to connect under with . If black prevents this with , white cuts with . Now black has two ways to give atari.
If gives atari from this side, guarantees that white will cut one way or the other. So black should atari the other way.
This atari doesn't work, because after , black is caught in double damezumari
So black tries the other way. But after at , it is a double snapback
The best response by Black is simply to fix the problem in his lower center group. makes one and a half eyes, captures the lower right corner, and then makes two eyes by oshi-tsubushi.
Bass: If white starts at , then black can answer at to remove the eye on the left. White will naturally play the snapback sequence.
Bass: Capturing the four stones is gote, so white cannot get two eyes.
If white plays at , then at still kills.
Bass: White can secure the eye on the left in sente, so now the single eye gained by the snapback sequence will be enough.