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Here, the eyespace has three on the side, but in the center or with two on the side the implications are only better for White. The vital points are b and w and they are miai for life with six points.
makes miai of a and b to live with six points.
at would only threaten to make seki rather than to kill, and would be Black's last threat here since White's reply would be at .
The status of this group is actually unsettled. If Black plays first, White can be killed. The Chinese calls this 断头板六 (literally, "decapitated" rectangular six).
On the other hand, if the rectangular six group has two cutting points as shown, then it is still alive. The comb formation is essentially a rectangular six with two cutting points of this form. Life and death can be so strange.