Trick Score
The basic unit is trick score. You score 20 points for each trick made in clubs or diamonds, 30 points per trick for each trick made in hearts or spades, and 40 points for the first trick in notrump, 30 for the remainders.
The Rubber Bonus
When you make 100 points or more in trick score, you have reached a plateau, making game. When you make game, you become vulnerable.
The side that makes game twice wins the rubber, and collects the rubber bonus of 700 if the other side has not scored a game, 500 if they have. Points scored for overtricks (tricks made in excess of the contract) do not count toward game.
Part Scores
Trick scores less than 100 can be combined to make game, unless the other side makes game in the interim. Making game resets the trick score counter for both sides.