3593 enclosure

3593 enclosure  

In recent professional practice, White comes in at a or at b here.

White enters at 4-3  

In this case it is natural for Black to play 2. Now White will play to avoid being shut in.

Life on the inside  

If White is more concerned about quick life, it makes more sense to come in at 3-3. But White can't get out past Black 2.