It was on hard (there is no other difficulty setting, people).  I played a perfect Lumber cartel strategy, while connecting up to a Lumber port, and running a long road.  By the end, I had a Lumber-8 and Lumber-6 tied up with 1 city on the 6 and THREE cities on the 8.  That's 8 points, plus the 2 for the longest road is my 10.  An overabundance of 8's and a significant lack of 7's and the game was a f-ing breeze.

The other three CPU's all tied with 4.   FOUR, you mofo's!!!