Scoring
On the right had side of the parly screen is a column with numbers at the top and bottom. (#12) The top is your opponent (red), the bottom is you (blue). So far the parley always starts at zero and you can only reduce your Remaining points (#8) when the marker is on your side of the zero. Keepng the morker on your side of the zero keeps your opponent from runing out of points. (#3)
The only reason I posted this is that most guides dont go over the fact that your point total only goes down when the marker is on your side at the end of the round.