Page 44, problem 168, solution diagram
If Black turns at 1, White can't stop him from getting two eyes.
Erratum: White can make a seki by playing 2, the sequence to 4 leads to seki.
Grauniad: Huh? Doesn't at a, capturing 2 stones, give Black two eyes? What am I missing?
Niklaus: Throwing in at (or below, of course) prevents black from capturing the two stones in the corner.
Dieter: This gives seki. Seki is all right. But I agree that the comments often fall short.
Skelley Ah... seki is alright, but it is not two eyes as promised, is it?
victim This Black 3 is actually worse than Black 3 at 4, since Black doesn't get any prisoners.
Grauniad: But why would Black at choose an inferior seki?
victim: I was confused - too much work on my time machine tends to disturb my sense of causality :) I corrected my text.