Matchpoints vs IMPs: How Bridge Scoring Works in Duplicate Events

Updated March 2026, reviewed for accuracy with current ACBL standards and modern bidding trends.

Two players sit down at a club game. They bid 4♠ and make it. Their teammates, playing the same cards across the room, also bid 4♠ and make it. Same hand, same contract, same result. But depending on the scoring format, this might be a dead tie, or someone might have just won a significant swing.

That’s the bridge scoring puzzle. The underlying trick scores are fixed everywhere. What changes is the currency being used to measure results.

This guide covers the three main scoring currencies in bridge: rubber bridge points, matchpoints, and IMPs. And what each one means for how you actually play the game.

Start here: the underlying trick scores

Before getting into formats, the point values are the same regardless of where you play. These never change:

Denomination	Points per trick (above 6)
Clubs (♣) or Diamonds (♦)	20
Hearts (♥) or Spades (♠)	30
Notrump, first trick	40
Notrump, each additional	30

So a 3NT contract bids 3 tricks above 6. The score: 40 + 30 + 30 = 100 points. A 4♠ bid: 4 × 30 = 120 points. These trick scores are the raw material. What the format does is decide what to do with those numbers.

For a full breakdown of how scoring works, see our bridge scoring guide.

Rubber bridge scoring: accumulating toward game

Rubber bridge is the oldest and most intuitive format. Two partnerships play until one side wins two “games.” A game happens when you accumulate 100 points below the line from contracts you bid and made.

The game-making contracts are:

3NT (40+30+30 = 100 points)
4♥ or 4♠ (4 × 30 = 120 points)
5♣ or 5♦ (5 × 20 = 100 points)

You don’t have to get there in one hand. Bid and make 2♠ for 60 points below the line, then make another 2♠ next hand, and you’ve accumulated 120 points and made game. Partial scores carry forward.

Once you’ve won two games, you’ve won the rubber. The bonus:

Rubber result	Bonus
Win 2-0 (opponents won no games)	+700
Win 2-1 (opponents won one game)	+500

Slam bonuses apply on top of trick scores:

Slam type	Not vulnerable	Vulnerable
Small slam (12 tricks)	+500	+750
Grand slam (all 13 tricks)	+1,000	+1,500

Penalties for going down, undoubled:

Not vulnerable: 50 per undertrick
Vulnerable: 100 per undertrick

Rubber bridge rewards raw point accumulation. A game bonus is worth hundreds of points. Missing a slam is genuinely expensive. This shapes aggressive bidding: go for games and slams because the bonuses are large and real.

How duplicate bridge handles this differently

In duplicate, there’s no rubber and no below-the-line accumulation. Every board is scored in isolation, as if it’s the one hand that decides everything.

The same trick scores apply, but bonuses are pre-baked into flat scores:

Contract result	Not vulnerable	Vulnerable
Part score	Trick score + 50	Trick score + 50
Game (bid and made)	Trick score + 300	Trick score + 500
Small slam (bid and made)	Trick score + 500 + game bonus	Trick score + 750 + game bonus
Grand slam (bid and made)	Trick score + 1,000 + game bonus	Trick score + 1,500 + game bonus

So a non-vulnerable 4♠ making exactly scores: 120 (trick score) + 300 (game bonus) = 420. The same contract vulnerable: 120 + 500 = 620. These numbers (+420, +620, -50, -100, -800) are what you see on duplicate scoresheets.

Each hand produces a number. Then what happens to those numbers depends on the scoring format: matchpoints or IMPs.

Matchpoints: you vs. the whole field

Matchpoints is what most club duplicate games use. Your score on each board gets compared against every other pair who held the same cards in the same direction.

The math: if 10 pairs played your board as North-South, your result competes against the other 9. Beat a pair: 1 matchpoint. Tie them: 0.5 matchpoints. Lose to them: 0 matchpoints.

Maximum possible on a board with 9 other pairs = 9 matchpoints.

Here’s what this creates: every single trick carries equal weight. If the field is making 4♠ (420), and you make 4♠+1 (450), you beat everyone who stopped at 10 tricks. A 30-point difference counts the same as a 300-point difference. You either beat another pair or you don’t.

This has real consequences for how you play:

Overtricks matter enormously. At IMPs or rubber, making 4♠ is making 4♠. At matchpoints, squeezing out that 11th trick beats every table who stopped at 10. The extra 30 points is worth a full matchpoint per pair.

Going minus is often catastrophic. Losing 100 when the field is making 110 doesn’t cost you the difference in points. It costs you a full matchpoint per pair. Being +50 or +100 instead wouldn’t change anything against another pair’s +110; anything positive beats anything negative.

Normal results are fine. The field is your benchmark. Beat it slightly on average and you’ll win. You don’t need dramatic swings; you need to be consistently better than the average pair holding your cards.

For more on how this changes bid-by-bid decisions, see the matchpoint strategy guide.

IMPs: you vs. one other team

IMPs (International Match Points) are used in team events: Swiss teams, KO tournaments, board-a-match, international competition. Instead of comparing against the whole field, your team competes directly against one other team.

How it works: two pairs from your team sit North-South at one table; your other two partners play South-North at a different table (the “closed room”). When the round ends, your team’s result on each board gets compared to your teammates’ result on the same board.

Say your pair bid 4♠ vulnerable and made it for +620. Your teammates were defending and let 4♠ through, so they scored -620. Combined: your team gained 620 + 620 = 1,240 points on that board. Then you convert the raw difference to IMPs using the standard table:

Points difference	IMPs
0-10	0
20-40	1
50-80	2
90-120	3
130-160	4
170-210	5
220-260	6
270-310	7
320-360	8
370-420	9
430-490	10
500-590	11
600-740	12
750-890	13
900-1,090	14
1,100-1,290	15

The table goes to 24 IMPs (for differences above 4,000 points), but you rarely see the high end in practice.

The IMP scale is deliberately nonlinear. The first 100 points of difference are worth 3 IMPs. The next 100 are worth 2. This compression means that large swings don’t run away with matches the way they might in raw points. The biggest mistake at IMPs isn’t one bad board; it’s consistent small errors across many boards.

Matchpoints vs IMPs: the strategic split

The scoring format changes how you should play. Not slightly. The two mindsets are genuinely different.

Overtricks. At matchpoints, going for an overtrick is often right when the risk is small. At IMPs, making your contract is the priority. Risking the contract for one extra trick is a bad trade: you’re gambling 10+ IMPs for 1 IMP.

Bidding games. At IMPs, bid any game that’s better than 50% to make. The math works out because the game bonus is large relative to the cost of going down one. At matchpoints, a 45% game might not be right. If most of the field stops short, you score below average on the hands where you fail. The Rule of 20 gives you a quick opening bid filter, but borderline game decisions at matchpoints need the additional layer of “what will the field do?”

Slams. At IMPs, bid slams with reasonable odds. The bonus for making a vulnerable small slam (750 extra points) converts to 13+ IMPs. Missing a makeable slam against a team that bids it is a large loss. At matchpoints, the logic is similar, but borderline slams require more accuracy because a zero on one board hurts your overall percentage.

Sacrificing. At matchpoints, taking a save that goes down 300 to stop opponents making 420 is often right. You lose 300 instead of 420, and saving 120 points matters board by board. At IMPs, the math is different. Saving at -500 against their +420 is a 9-IMP loss when defending would also have been a 9-IMP loss. Sacrifices at IMPs need careful calculation.

Quick comparison: rubber vs matchpoints vs IMPs

	Rubber bridge	Matchpoints	IMPs
How scoring works	Points accumulate toward game over multiple hands	Compare result vs. all other pairs on same board	Compare result vs. one opposing team
Game bonus	+500 or +700 at rubber’s end	Baked in: +300 NV / +500 V	Baked in: +300 NV / +500 V
Do overtricks matter?	Slightly	Yes, significantly	Barely
Where you’ll encounter it	Home games, social play	Club games	Team tournaments
Key strategic focus	Bid games and rubbers aggressively	Beat the field by any margin	Minimize large errors

FAQ

What does +420 mean on a duplicate scoresheet?

North-South bid and made 4♠ not vulnerable. The trick score is 120 (4 × 30), plus the 300 non-vulnerable game bonus, equals 420. The plus sign means North-South scored positively. East-West on the same board would record -420.

Can you convert between matchpoints and IMPs?

No direct conversion. They measure different things. Matchpoints is a percentage of boards beaten. IMPs is a cumulative point total across the match. A 55% matchpoint score is good; 20 IMPs ahead in a 24-board match is also good. The two numbers don’t translate to each other.

Why do team events use IMPs instead of matchpoints?

IMPs reduce the luck component more than matchpoints do. In matchpoints, one bad board loses you one top. In IMPs, each board carries roughly proportional weight to its scoring value, which means consistent, accurate play matters more than getting a single spectacular result.

Bridge scoring isn’t arbitrary. Each system rewards something specific: rubber bridge rewards getting to game over multiple hands, matchpoints rewards beating the room hand by hand, and IMPs rewards consistency against a direct opponent.

Understanding which game you’re playing, and adjusting your approach accordingly, is something most players figure out slowly over years. The scoring is where a lot of strategic decisions actually come from.

For a deeper look at slam bidding and how scoring affects when to push for six or seven, the encyclopedia covers the full analysis. If you’re new to the duplicate format, What is Duplicate Bridge explains the setup before you worry about which scoring system applies.

Ready to practice scoring decisions in real hands? Brian can explain exactly why a bid was right or wrong given the format, with immediate feedback on each decision.