Seems white needs another move here. With this , white lives in sente (with respect to
).[1] Without
by white, white is short of liberties after black ataris at a.
LukeNine45: Right. Here is the threat played out.
If this , White still dies.
JoelR: This lives, but with less area than the best solution. If
at
,
at
.
[1] Bill: Saving is small by comparison. Better to think of this as a gote.