Block - a third escape
no Sound  -  show move#
Broken canvas...
to move

If Black moves B1 on White-1, he's in trouble ...
If White takes the corner, Black should take care: he cannot immediately take B1, because D10 keeps him from the rightmost side. The narrow escape with Black-3 is unlikely to be successful in any actual game situation.
At the top of the diagram we see Black securing access to the leftmost side, forcing White to close at the other end. An interesting question is whether Black-5 can be played at White-6.
See next how this situation may develop into a 'running game'.