I just found another rule that I missed:
At the end of your turn, after you draw 2 cards, both you and your opponent may discard 1 bohnus card.
You then draw bohnus cards until you have 3, and then your opponent does the same.
I don't know how much it would affect play (we haven't discarded bohnus so far) but I thought it was worth noting.
I am not sure ... did your posting include a rule question? ;-)
We included that part of the rules because sometimes you really have bad Bohnus cards. You know exactly that you will never fullfil them during the next 3-4 turns. And so you might have a bad feeling. To give more equal opportunities to both players we put this into the rules. So finally it is the decision of the players to grab the chance to improve their hand. ;-)