My wife and I were playing it tonight and after 2 rounds I found tension missing so I created a 2-player variant on the spot.
1) ONE card at Kingsbridge per round. 2) ONE card at Shiring per round (1 will be discarded each round). 3) TWO resources in each Market instead of 4.
This increased the tension immediately and made for very interesting choices. Now there was a real fight to go 1st when originally it didn't matter as much. Additionally you can even reduce the number of Resource Cards available each turn from 7 to 5.