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 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 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.