ACBL Instant Duplicate Scorer

Duplicate

At duplicate bridge (where every table plays the same deals), every deal is scored separately and no part scores are carried forward.

Remember that your final contract refers to the number of tricks the partnership is willing to commit to over the book of six. 1 is a commitment to take 6 + 1 = 7 tricks.

You earn 40 points for the first notrump trick scored and 30 points thereafter; 30 points for each spade and heart trick; 20 points for each club and diamond trick.

Trick values double in doubled contracts and are doubled again for redoubled contracts.

Examples:

• If we bid 2 and make 4 (10 tricks) we score 170 (60 for 2 bid and made, 60 for two overtricks and 50 for the part score).
• If we bid 4 and make it when we are not vulnerable we score 420 (120 for the contract and 300 for the game).
• If we bid 4 and make it when we are vulnerable we score 620 (120 for the contract plus 500 for the game).

Whenever one side scores a slam, or a game, or a partscore, the side collects, in addition to the trick score, an immediate bonus. For instance:

• For making a vulnerable grand slam 1,500
• For making a non-vulnerable grand slam 1,000
• For making a vulnerable small slam 750
• For making a non-vulnerable small slam 500
• For making a vulnerable game 500
• For making a non-vulnerable game 300
• For making a partscore 50
• For making a doubled contract 50
• For making a redoubled contract 100

If the declaring side makes one or more overtricks, the side collects per overtrick:

• For an undoubled contract, non-vulnerable Trick Value
• For a doubled contract, non-vulnerable 100
• For a redoubled contract, non-vulnerable 200
• For an undoubled contract, vulnerable Trick Value
• For a doubled contract, vulnerable 200
• For a redoubled contract, vulnerable 400

When the contract is defeated, the opponents collect:

• For each non-vulnerable trick 50
• For each vulnerable trick 100
• Not vulnerable doubled 100,300,500 for down 1, 2 and 3 (300 more for each additional trick)
• Vulnerable doubled 200,500,800 for down 1, 2 and 3 (300 more for each additional trick)
• Not vulnerable redoubled 200, 600, 1000 for down 1, 2 and 3 (600 more for each additional trick) Vulnerable redoubled 400, 1000, 1600 for down 1, 2 and 3 (600 more for each additional trick)

These scores, of course, are not yet the final scores. They have yet to be compared with the scores achieved by other people who have played the same cards. The method of doing this comparison varies according to what kind of duplicate is being played:

## Matchpoints

This is the game most usually played by pairs in bridge clubs and tournaments.

Generally you play two or three boards at a table—this is called a round—and then one pair moves to another table and plays other boards against other opponents.

Scores for each hand, or board, are recorded and given to the director to tally the results of the entire game. Each pair has a number to identify them and this must also be entered on the scoresheet to show whose result it is. At the end of the whole session, each pair is awarded 1 matchpoint for each pair who scored worse than them on a board, and 1/2 matchpoint for each pair who scored equally. The scoring now is simplified by a program called ACBLscore developed by the ACBL and used internationally.

A completed scoresheet might look like this:

# Board No. 1

Pair No. North-South Matchpoints
NS EW Contract By Tricks Plus Minus NS EW
1 8 4S N 10 420 2.5 3.5
2 13 3NT S 10 430 4 2
3 11 5C* E 8 500 6 0
4 9 4S N 10 420 2.5 3.5
5 14 4S N 11 450 5 1
6 12 5S N 10 50 0 6
7 10 3S N 10 170 1 5

Then the total matchpoints scored by each pair over all the boards are calculated. This is generally converted to a percentage, for each pair, of the points they scored compared to the theoretical maximum. This gives a fair comparison between pairs who have played different numbers of boards.