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IMP's

#1 User is offline   dunce 

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Posted 2003-November-14, 16:46

I know I seem stupid with this B) but what are IMP's and how do you calculate them?
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#2 User is offline   Cascade 

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Posted 2003-November-14, 17:07

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I know I seem stupid with this B) but what are IMP's and how do you calculate them?


IMPs are International MatchPoints.

The are calculated by referring the difference of your table score and the table score of another table to the IMP Table:

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

The IMPs calculated in a team game is the direct comparision of the two tables scores.

The IMPs calculated in and pair game is the average of the IMPs scored against every other table. This is called cross-Imps.

For a pair game there is an alternative IMP calculation called Butler IMPs. In Butler IMPs first the "Butler" score is calculated by averaging all of the table scores and then your IMP score is calculated by comparing it with the Butler or Datum Score. This is not used on BBO.

Wayne
Wayne Burrows

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#3 User is offline   inquiry 

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Posted 2003-November-14, 17:10

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I know I seem stupid with this B) but what are IMP's and how do you calculate them?


Hi,this is the reply I gave on this topic when posted by hallway nearly a year ago..
http://forums.bridgebase.com/in...t=msg956#msg956

You may want to go read the entire thread, as there is more than my reply....

---------(cut and paste from Feb 2002 starts here ------------


Imps is one way to compare duplicate results.

You could play total points. You play the hand, and get say 620, at the "other" table they are down one for -100 so your ntet score (total points) is 720. But there are some really wild swings, so one bad hand (say you bid 7H and they set it with a ruff at trick one while 7NT bid at the other table, would lead to such a large total point lead that, well, you lose pretty much regardless how well you play the rest of the hands.

Rather than allow one hand or two key hands decide everything, the wide range of total point scores has been replace by a table. You look up the difference in the table and see how many imps you get. Part of the table is:
Points IMPs
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
900-1090 14
1100-1290 15
1300-1490 16
1500-1740 17
1750-1990 18
2000-2240 19
2250-2490 20
2500-2990 21
3000-3490 22
3500-3990 23
4000+ 24

The way the scoring works, if you are +10 imps on a hnad, your opponents are -10 imps. At the BBO, your imps are figured against each other table... and then averaged.

For instance if you are +100 and two other pairs with your hand are +!00 and -200. What is your imp score?

Your 100 versus the other 100 is a tie, for 0 imps
Your +100 verus -200 for the other guys with your cards is a +300 for you. Looking in the table, you see that +300 is +7 imps for you. So +0 +7 imps total 7imps/2 comparisons, your average score is +3.5 imps.

Hope that helps.
--Ben--

#4 User is offline   dunce 

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Posted 2003-November-14, 18:07

thank you B) i understand now
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