Commercial Harbor - Is it mandatory to offer trade to each player?
According to http://www.catan.com/files/downloads/catan_ck_5th_ed_rules_150303.pdf
You may force each of the other players...
In the latest game with AI, I had no option to not doing trade with latest player.
Is it bug or different rules apply?
Never read the rules but also was wondering about this "must" thing as sometimes you dont even need two cards as you are going after one particular so pretty much you are wasting a resources and getting useless commodity in return.