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IMP means International Match Points. This is not the same as Matchpoints.

 

Say you play a team match and your score is 400 (for example 3NT making) while you teammates have -430 (for example defending 3NT making ten tricks). This gives you a total score of 30 (400 minus 430). Now you can see in the IMP table that 30 points gives your opponents 1 IMP, so you lost 1 IMP on that board. The idea is that by using IMPs rather than raw points ("total points" scoring), you make the extreme boards less influential. Say 7NT was bid at both tables, but makes at one table and was down one at the other table. Counting total points, this would likely decide the match, but that would be a little unfair since the successful play and defence of grand slams is not (much) stronger evidence for good bridge skills than is the successful play and defence of part scores.

 

Wikipedia has an article about it: http://en.wikipedia.org/wiki/Duplicate_bridge#IMP_scoring

 

On BBO, IMPs are used almost all the time. In real life, most pairs tournaments are scored using matchpoints while most team matches are scored using IMPs.

 

Total points can be played on BBO but is rare, except for robot reward. It is almost never played in real life.

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