The status of this group is unsettled.
here is also a solution, but has quite a number of variations. If , then connects, and after , a and is miai for life.
For , will capture the two White stones directly. Again, a and are miai for life.
is a plan to immediately secure the rectangular six (respectively a derivation). But threatens simultaneously connection to the outside ( at a) and killing the rectangular six ( at ). , in the hope of creating seki with the additional point a, cannot work because of the two cutting points in Black's group.
This results in a bulky five.