Explain Swiss pairs scoring/match-ups

[dae]

Can anyone explain HOW Swiss Pairs are scored? Are the top scores pitted against each other for the next round? ARE IMP scoring tables used? dae

[uday]

As every round begins in each section

 

1. The section is scored

2. The pairs are ordered by score

3. the pairs are seated at table 1 NS, EW, 2 NS, EW

 

Best scores are at table 1, worst scores at the last table in the section.

[Double !]

again, I shall suggest.

 

in the interest of reducing the skewing of the imp pairs scores due to aberrant scores at one or two tables, please consider dropping the highest and the lowest N/S (or E/W) score and then calculate the mean.

 

I suggested this a few years ago, was told no at that time, and that's OK with me. I'm easy. But, i ask that the powers to be please reconsider the issue.

 

Thanx

 

DHL

[Gerardo]

IMP or MP results are used, it depends on how the tourney calculate scores.

 

Also, in a Swiss, playbacks are not allowed. What BBO calls Swiss would be properly named Danish, IIRC.

 

Sorry, DHL, that can't be done. BBO doesn't use Butler (optionally drop the extremes, then calculate the mean, then compare), but Crossed IMPs (compare with every other result, then optionally take the mean of that).

 

This is analogous to how MPs are calculated, but instead of 1/0.5/0 you get the IMPed difference. It is also how the Cavendish does calculations (but they don't take the mean afterwards, just the total). As BBO does take the mean, the numbers look somewhat similar to Butler, but they are not the same.

 

Big fields reduce the weight of extreme results, so big tourneys are better in that regard (initial computations in barometer compare against same section I think (it is a guide), but final results compare across the field, I think).

 

MBC field is 16 tables. I think a bigger number would help in this regard.