DUPLICATE BRIDGE SCORING

	Points Per Trick	Tricks per Game	Game Contract	HCPs needed for Game
and	20	11	5/5	27
and	30	10	4/4	25
No Trumps	40 for 1^st trick 30 each for subsequent tricks	9	3NT	25

The declaring side only scores points if they win the number of tricks they bid (or more). No points are won for the first six tricks. A game contract is the number of tricks required to score 100 points. This scores a bonus of 300 points (or 500 if vulnerable).

If you bid a contract that scores less than 100 points, this is called a Part Score. If you make a Part Score you score a bonus of 50 points.

If you fail to make your contract your opponents score 50 points (or 100 if vulnerable) for every trick you fail by (called undertricks).

Notice from the table above that you need less tricks to make game in and (major suits) or in No Trumps than you do in and (minor suits). You also need less High Card Points (HCPs) to make game in the major suits or in No Trumps than you do in the minor suits. At duplicate it is better to aim to play in major suits or No Trumps if at all possible.

VULNERABILITY

When a pair is vulnerable it changes the game and slam bonuses and undertrick scores. See the scoring table below for how being vulnerable affects these scores. Part scores are not affected. In duplicate bridge the vulnerability changes on each board, the pair that are vulnerable are shown in red.

DOUBLING AND REDOUBLING

If you think the opponents have bid too high and will fail to make their contract you can double for penalties. This will affect the number of points you will score for each trick they go down by. But it will also double the points they will score if they make the contract! If your side has been doubled and you are certain you will make the contract, you can redouble. See the scoring table below for how redoubling affects the score.

DUPLICATE SCORING TABLE
Tricks bid and made		UnDbld	Dbld	ReDbld
&	Each trick	20	40	80
&	Each trick	30	60	120
No Trumps	Each trick	40	80	160
No Trumps	Each subsequent trick	30	60	120
Undertricks
Not vulnerable	First trick	50	100	200
	Second and third trick	50	200	400
	Each subsequent trick	50	300	600
Vulnerable	First trick	100	200	400
	Second and subsequent tricks	100	300	600

Bonuses
Part-score contract bid and made		50
Game bid and made	not vulnerable	300
	vulnerable	500
Small slam bid and made	not vulnerable	500*
	vulnerable	750*
Grand slam bid and made	not vulnerable	1000*
	vulnerable	1500*
For making a doubled contract		50
For making a redoubled contract		100

* Slam bonuses are in addition to game bonuses

Overtricks
Undoubled - Trick value
Doubled - 100 each if not vulnerable	200 each if vulnerable
Redoubled - 200 each if not vulnerable	400 each if vulnerable

DUPLICATE SCORING EXAMPLES

The contract is for 10 tricks by North. North makes 11. 30 points for spades x 5 (no score for the first 6 tricks) = 150. Plus game bonus of 300 = 450

Cont.	By	Tricks Made	Score
			N/S	E/W
4	N	11	450	-450

The contract is for 7 tricks by West. West only made 5 tricks so has failed by 2 tricks. N/S score 50 per trick that E/W failed by, so N/S score 100.

Cont.	By	Tricks Made	Score
			N/S	E/W
1	W	5	100	-100

The contract is for 9 tricks by East. East makes 9 tricks. 40 points for the first trick in NT and 30 for subsequent tricks. 40+30+30 (no score for the first 6 tricks) = 100. Plus game bonus of 300 = 400

Cont.	By	Tricks Made	Score
			N/S	E/W
3NT	E	9	-400	400

The contract is 7 tricks by South. South makes 8 tricks. 20 points for Diamonds x 2 (no score for the first 6 tricks) = 40. Plus part score bonus of 50 = 90.

Cont.	By	Tricks Made	Score
			N/S	E/W
1	S	8	90	-90

The contract is for 9 tricks in hearts by South. South makes 10 tricks. 30 points for Hearts x 4 (no score for the first 6 tricks) = 120. Plus part score bonus of 50 = 170. Note that South did not score the game bonus of 300 because he did not bid game (4).

Cont.	By	Tricks Made	Score
			N/S	E/W
3	S	10	170	-170