JoelR: I think the group is alive.
Bill: above is an unnecessary sacrifice.
After Black cannot fill at to make a dead shape.
If Black plays at instead of , captures four stones.
Then if , throws in to make oiotoshi.
P7A77: This looks dead, no? So answer is lives or dies according to sente.
Bill: is a good attack, but makes two eyes.
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Referenced byKyuExercise43