International Match Points
International match points (IMP) within the card game of contract bridge is a measurement for conversion of absolute contract bridge scores. The total point difference between two scores is compared to a scale ranging from 0 to 24 to obtain an IMP score.[1][2]
| Point difference | IMPs | Point difference | IMPs | Point difference | IMPs | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| from | to | from | to | from | to | |||||
| 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 scoring is used in competitive bridge, including duplicate bridge (including on some online bridge websites),[4] but rarely in any kind of companion bridge, and never when playing rubber bridge.[5]
Optimal tactics at IMPs differ from those of matchpoints and are similar to those for rubber bridge. When playing for IMPs 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
[edit]- ↑ "IMP: International Match Point Scoring - Duplicate Bridge". www.bridgehands.com.
- ↑ "IMPs and Matchpoints". pi.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.