BBO Discussion Forums: To tie or not to tie, that is the question - BBO Discussion Forums

Jump to content

Page 1 of 1
  • You cannot start a new topic
  • You cannot reply to this topic

To tie or not to tie, that is the question 'Tis rounding the rub, methinks

#1 User is offline   McBruce 

  • NOS (usually)
  • PipPipPipPipPip
  • Group: Full Members
  • Posts: 724
  • Joined: 2003-June-25
  • Gender:Male
  • Location:New Westminster BC Canada

Posted 2020-August-05, 13:40

Pairs tournament 4164 today, interesting ending:

Name Score (%) Rank
A B C
Prize Points
Lin1951+van0602 60.63
1 1 1
1.28
veecon+Robby8 60.62
1 1
1.28

One pair's results show 2/26, 60.62% at the top of the list and 60.63% at the bottom.
The other's results show 1/26, 60.63% at the top of the list and 60.62% at the bottom.

It would seem we have a rounding discrepancy in the code.
ACBL TD--got my start in 2002 directing games at BBO!
Please come back to the live game; I directed enough online during COVID for several lifetimes.
Bruce McIntyre, Yamaha WX5 Roland AE-10G AKAI EWI SOLO virtuoso-in-training
0

#2 User is offline   pgrice 

  • PipPipPip
  • Group: Full Members
  • Posts: 57
  • Joined: 2009-July-21

Posted 2020-August-06, 01:55

View PostMcBruce, on 2020-August-05, 13:40, said:

Pairs tournament 4164 today, interesting ending:

Name Score (%) Rank
A B C
Prize Points
Lin1951+van0602 60.63
1 1 1
1.28
veecon+Robby8 60.62
1 1
1.28

One pair's results show 2/26, 60.62% at the top of the list and 60.63% at the bottom.
The other's results show 1/26, 60.63% at the top of the list and 60.62% at the bottom.

It would seem we have a rounding discrepancy in the code.


There is indeed. I've seen examples where one pairs is ranked above an other but has fewer match points. Very sloppy to do your rounding/truncation in the middle of the calculation rather than at the end.
0

#3 User is offline   McBruce 

  • NOS (usually)
  • PipPipPipPipPip
  • Group: Full Members
  • Posts: 724
  • Joined: 2003-June-25
  • Gender:Male
  • Location:New Westminster BC Canada

Posted 2020-August-06, 20:26

View Postpgrice, on 2020-August-06, 01:55, said:

There is indeed. I've seen examples where one pairs is ranked above an other but has fewer match points. Very sloppy to do your rounding/truncation in the middle of the calculation rather than at the end.


This is usually because there is an averaged board in there somewhere. The BBO system calculates the percentages correctly, but sometimes on ACBL Live for Clubs the matchpoints are wrong, even though the percentages copied from BBO results are correct.
ACBL TD--got my start in 2002 directing games at BBO!
Please come back to the live game; I directed enough online during COVID for several lifetimes.
Bruce McIntyre, Yamaha WX5 Roland AE-10G AKAI EWI SOLO virtuoso-in-training
0

Page 1 of 1
  • You cannot start a new topic
  • You cannot reply to this topic

2 User(s) are reading this topic
0 members, 2 guests, 0 anonymous users