White sacrifices , and then makes two eyes by capturing
and
, leaving the marked stones unprotected (Black can play at a later on, to capture them in a snapback). Note that White's liberty at b is crucial; if not for it,
at c prevents
. See J-group#straight J-group.
At several stages, White can make a mistake.
White dies in gote, the worst of all events, because Black can almost fill White's eyespace with a bulky five at any time.
This is the sort of bad move that could be in the (imaginary) book Get Strong At Gote.
Simply connecting is not good enough. After , Black will be able to almost fill White's eyespace with a killing shape.
is a move that may come to mind. Black grabs the vital point at
. If
, then
blocks on the outside. If White plays at a to prevent the snapback, he dies in gote.