They are for scoring. The rules in my version have a little section on them. Each player starts with 500 points in chips. When a player goes mhing, the other players have to pay him the credit value of his hand. The game ends after 4 rounds (the winner being the player with the most chips) or if 1 player has all the chips. There's a chart for converting your point totals to credits (it's base 2 based...so it starts as 2 points equal to 1 credit and ends at 256 points equal to 14 credits, it doesn't step evenly though).