question on rule

[jentzd]

This might be the perfect forum for a rule clarification I am seeking.

I am playing just a 1on1 asphalt type pickup game of basketball, but I would like to practice the rule properly in compliance with well known standards.

The question is regarding to defending the low post. Player O has the ball inside the key, his back to the defender Player D and the basket. O is dribbling while inching closer to the basket. D puts his forearm on O's back.

Now, the question is- the next time O inches forward, is player D allowed to apply equal pressure so that he can maintain his defensive position? Or must D allow player O to move to that extra inch.

The NBA rules say 1 forearm and /or arm with bent elbow is allowed to touch defender when inside the lower defensive block in order to maintain defensive position, as long as it does not impair speed and balance of the player with the ball... am I interpretting correctly?

Thanks in advance!
-David Jentz