Life In 19x19

q11 from KGS has supplied an answer.
White threatens to connect, and then aims to make a bulky five.
$$B
$$ ------------------+
$$ . . . O 3 2 . . . |
$$ . O . X X O O 1 . |
$$ . O . . X . X X 4 |
$$ . . O . . , . . . |
$$ . . . O . . O O . |
$$ . . . . O O . . . |
$$ . . . . . . . . . |

If ...

I've been going through the second set of problems that come with the GoGrinder App on Android. In general they're difficult and I can't always understand all the subtleties. I created this account to start discussion about some of these problems.

Problem 1: Black (X) to play, presumably trying to ...