You have just made 3NT with an overtrick. At one club it is a near-top. At another it is worth barely a fraction of an IMP. The cards did not change. The scoring did.

Duplicate bridge is comparative: the same deals are played at several tables, then results are measured against each other. But there is more than one way to make that comparison. Matchpoints, IMPs and Butler are the three methods you will meet most often in UK club and tournament play. Knowing which one is in use changes what you should be trying to achieve on every board.

Why duplicate scoring changes everything

In rubber bridge, you simply add up points. In duplicate, raw totals are awkward because a board might offer a part-score to one pair and a slam to another. Comparing 430 on one board with 100 on the next tells you very little. So duplicate scoring compares like with like: your result on a board against other results on that same board.

That comparison can be done trick by trick, as in matchpoints, or by converting score differences into International Match Points, as in IMPs and Butler. The method is usually printed in the conditions of contest or announced before play. If you are unsure, ask the director before the first board, not after.

Matchpoints: every trick is a vote

Matchpoints are the standard for club pairs evenings. Each board is scored by comparing your result with every other pair who played it. You normally receive two matchpoints for every pair you beat and one matchpoint for every pair you tie. If seven other pairs played the board, a score that beats all seven earns 14 matchpoints. A score that loses to all seven earns zero.

The effect is brutal and simple. Frequency matters more than size. Beating a score by 10 points is worth exactly as much as beating it by 1,000. One overtrick can turn an average into a top; one undertrick can turn a top into a bottom.

A quick matchpoint example

Suppose most of the field is in 3NT, non-vulnerable, making nine tricks for 400. You make ten tricks for 430. You beat every pair in 400, so you score a near-top. If you go one down for -50, you score a near-bottom. The 30-point difference between 400 and 430 is tiny in total-point terms, but enormous in matchpoints.

That is why matchpoint pairs encourages aggressive overtrick play and careful defence. Declarer may take a finesse for a tenth trick if it does not risk the contract. Defenders fight for every undertrick, because holding declarer to eight tricks instead of nine may beat several pairs. It also punishes carelessness: a lazy discard on defence can cost more matchpoints than a bold bid that fails.

IMPs: the teams game

IMPs are used for teams matches, usually teams of four playing two tables. Your pair sits North-South at one table while your team-mates sit East-West at the other. At the end, the two scores on each board are compared. The difference is converted into IMPs using a standard scale.

The scale compresses large differences. A 20-point difference, such as 420 against 400, is 1 IMP. A 750-point difference, such as 1430 against 680, is 13 IMPs. A vulnerable game swing is bigger still: making 3NT vulnerable for 600 against going one down for -100 produces a 700-point difference, worth 12 IMPs.

How IMPs shape your decisions

In IMPs, an overtrick is often irrelevant. If your team-mates are plus 400 and you are plus 430, your side wins 1 IMP, but nobody will remember it. If you go down in a game that your team-mates made, you lose around 10 to 12 IMPs. That single board can decide a match.

So IMP strategy is about safety and making contracts. Bid your vulnerable games, especially close ones. Take a safety play that guarantees the contract rather than a finesse for an overtrick. Avoid wild sacrifices unless the arithmetic is clear. And remember that a small penalty is rarely a disaster; a doubled contract going for 800 is.

Butler: pairs meet IMPs

Butler scoring is a hybrid. It is used in pairs events, but instead of matchpoints, each result is compared with a datum score for the board. The difference between your score and the datum is converted into IMPs, usually using the same scale as teams bridge.

The datum is calculated from the results on that board. Depending on the event, it may be the average score, the median, or a trimmed mean that removes the extremes. Some events round the datum to the nearest 10 or 5. The exact method should be in the conditions of contest, but you do not need to calculate it yourself. The scorer does that.

Butler feels more like teams bridge than matchpoints. Overtricks matter less; big swings matter more. If the datum is 400 and you score 430, you gain 1 IMP. If you score -50, you lose 10 IMPs. Consistency across the session is valuable, but one bad board can be recovered with a good game swing.

Butler and cross-IMPs

You may also see cross-IMPs, especially online or in some congress events. Instead of comparing every score with a single datum, cross-IMPs compare your result with every other result on the board and average the IMPs. It rewards you for beating the field consistently rather than for beating one calculated number.

One board, three ways

Take a non-vulnerable 3NT board where North-South can make nine or ten tricks. Three results appear: 430, 400 and -50.

  • Matchpoints: 430 beats 400, so it is a top. 400 is average. -50 is a bottom.
  • Teams IMPs: If your team scores 430 and the other table scores 400, you win 1 IMP. If your team scores 430 and the other table scores -50, you win 10 IMPs.
  • Butler: With a datum of 400, 430 is plus 1 IMP, 400 is 0 IMPs, and -50 is minus 10 IMPs.
Same cards, same contracts, different objectives. Matchpoints asks “how many pairs did I beat?” IMPs asks “how much did I win by?” Butler asks “how far was I from the field?”

Which method are you playing?

Most UK club pairs sessions use matchpoints. Most teams leagues and knockout matches use IMPs. Many congress pairs events use Butler or cross-IMPs. Some events combine methods with victory points or point-a-board scoring, so read the entry form or ask the director.

If you are new to tournament bridge, start with club matchpoints. You will learn to fight for every trick. Then try a teams match. You will learn to value the contract over the overtrick. Butler sits between the two and is a good test of consistency.

Practical habits for each scoring method

  • Matchpoints: count tricks constantly. Look for a safe overtrick. Defend for every undertrick. Do not risk a making contract for a speculative overtrick unless the field is likely to be in the same position.
  • IMPs: make the contract first. Prefer safety plays. Bid vulnerable games. Avoid unnecessary risks in part-score battles. Accept a small loss rather than gamble a large swing.
  • Butler: think like a teams player, but remember the datum. Do not chase overtricks that gain 0 or 1 IMP. Avoid bottoms. Take your plus scores when they are available.
  • All methods: check the score slip. Write down the contract, declarer and result. Compare with your partner after the session. Reviewing one or two costly boards teaches more than replaying every hand.

Before your next event

Find out how the event is scored before you sit down. It takes ten seconds and can change your line of play on the first board. In matchpoints, chase every trick. In IMPs, protect the contract. In Butler, respect the datum but do not become paralysed by it.

The scoring method is not a different game. It is a different set of priorities. Once you recognise which one is in play, you can stop guessing and start making the decisions that actually win.

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