2010-09-02 DMP 4-3/Answer

Analysis by Stick:

Your opponent has a blot in his inner board that he won't be able to cover for a couple of turns even if he does hit you, your opponent's position is completely stripped, he has nothing to play whatsoever, so even though you are ahead in the race by far you want to keep the contact on maximizing the strength of your board versus the weakness of his. 

That being said you want to keep the point furthest back keeping the pressure on your opponent's midpoint.  All you're left with is breaking the midpoint, whether you play 13/10 13/9 or 13/6 is up for debate but the rest is clear.