International Match Points

International match points (IMP) within the card game of contract bridge is a measurement for conversion of the absolute contract bridge scores. The total point difference between two scores is compared to a scale ranging from 1 to 24.^[1]^[2]

Revised IMP table effective September 1, 1962^[3]
Point difference		IMPs	Point difference		IMPs	Point difference		IMPs
from	to	IMPs	from	to	IMPs	from	to	IMPs
0	10	0	370	420	9	1750	1990	18
20	40	1	430	490	10	2000	2240	19
50	80	2	500	590	11	2250	2490	20
90	120	3	600	740	12	2500	2990	21
130	160	4	750	890	13	3000	3490	22
170	210	5	900	1090	14	3500	3990	23
220	260	6	1100	1290	15	4000 or more		24
270	310	7	1300	1490	16
320	360	8	1500	1740	17

IMP score is used in competition bridge, including duplicate bridge (including at some online bridge websites),^[4] but rarely within any kind of companion bridge, and never if playing rubber bridge.^[5]

Tactics at IMPs differ from those of matchpoints and are similar to those of rubber bridge. The declarer's primary objective is to make the contract without jeopardizing it in a quest for overtricks; for the defense it is to defeat the contract without worrying about surrendering overtricks.^[6]

References

^ "IMP: International Match Point Scoring - Duplicate Bridge". www.bridgehands.com.
^ "IMPs and Matchpoints". www.math.cornell.edu.
^ 2017 World Bridge Federation IMP Table, Law 78
^ at [1] press play and then on the top right corner, "IMP" and scroll the question mark
^ MayHem. "Things you might like to know about duplicate bridge" (PDF). omahabridge.org. UNIT 241 Board of Directors.
^ Manley, Brent; Horton, Mark; Greenberg-Yarbro, Tracey; Rigal, Barry, eds. (2011). The Official Encyclopedia of Bridge (7th ed.). Horn Lake, MS: American Contract Bridge League. p. 421. ISBN 978-0-939460-99-1.

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[1] "IMP: International Match Point Scoring - Duplicate Bridge". www.bridgehands.com.

[2] "IMPs and Matchpoints". www.math.cornell.edu.

[3] 2017 World Bridge Federation IMP Table, Law 78

[4] t [1] press play and then on the top right corner, "IMP" and scroll the question mark

[5] MayHem. "Things you might like to know about duplicate bridge" (PDF). omahabridge.org. UNIT 241 Board of Directors.

[OEB7421-6] Manley, Brent; Horton, Mark; Greenberg-Yarbro, Tracey; Rigal, Barry, eds. (2011). The Official Encyclopedia of Bridge (7th ed.). Horn Lake, MS: American Contract Bridge League. p. 421. ISBN 978-0-939460-99-1.

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