There are many things Black can do with the stone. But before Black starts to play out anything with the
stone, the solution is to first jump down to the first line with
, which may be quite a surprise to uninitiated readers.
This appears to be the main line shown in various problem collections. This variation also explains why the stone is in the problem.
This is the canonical failure diagram, which is a connect-and-die. This is not the only sequence that leads to this end result, for example, at
,
at
,
at
,
at
et cetra will also lead to this end position.