Scoring

Each trick in a bid counts for 10 points if a partnership meets its bid. Tricks won above the bid are worth 1 point each. EXAMPLE: Beth and David bid 5 tricks and they won 7 tricks. They score 52 points (50 for the tricks bid, plus 2 for the extras, which are known as “bags.”)
If a partnership does not meet its bid, it scores 10 negative points for each trick it bid.
Scoring for Nil and Double Nil bids takes place as described above. When a player bidding Nil fails, tricks won by that player don’t count toward making his partner’s bid, but they do count as bags for the partnership.
In Cutthroat, if a player won as many tricks as their original bid, they will receive 10 points for every trick and if they happen to have any bags (a bag is a trick that is won in addition to the initial bid. Example: If a player bids 4 tricks and makes 5, the additional trick is called a “bag”), they will receive 1 point for each bag. Please read the examples below for further clarification:
EXAMPLE: If a player bid and won 4 tricks, their score will have 40 added to it.
EXAMPLE: If the same player who bid 4 tricks also won 2 over tricks, 40 points from their original bid + 2 points for the bags will bring their total score for the round to 42 points.
Bags can be a great source of points, however, if you accumulate 10 or more over a period of hands, you will lose 100 points from your total score. Any bags beyond ten are carried over to the next cycle, meaning that if you reach twenty bags you would lose an additional 100 points.
If a player doesn’t make their bid, that player loses 10 points for each trick they originally bid.

EXAMPLE: If your score was 100 at the beginning of the game, and you bid 5 tricks but only won 3, you will lose 50 points and your new score will be 50: 100 points - 50 points for the incomplete bid of 5 tricks

If you have a score of 400 points and had a successful bid of nil, your score will now be 500, however should you fail to win your bid of nil, your score will now 300 be and any tricks you won will count as bags.
 A bid of blind nil scores twice as much as an ordinary nil so you will have the opportunity to gain 200 points, but be careful, you can lose 200 points should you fail.

Example: If you start with 300 points and successfully win a blind nil hand, your new score will be 400 points, however, should you lose the blind nil, your score will be 200 points.
*It should be noted that a player may bid blind nil only if he is behind by at least 100 points.
The player that reaches the set point limit first (usually between 200 and 500 points) wins the game. If all players reach the set point limit in a single deal, the player with the higher score wins.