[shevek]

In your country, are there guidelines about carryforwards?

Take an example of 2 session qualifying to 1 session matchpoint final.
The trend in australia is to start afresh. That may have been due to technical limitations years ago.
Maybe time to revisit this.

Then there are Swiss teams with leaders playing off.

Advice please.

[gordontd]

shevek, on 2012-April-27, 22:06, said:

In your country, are there guidelines about carryforwards?

Take an example of 2 session qualifying to 1 session matchpoint final.
The trend in australia is to start afresh. That may have been due to technical limitations years ago.
Maybe time to revisit this.

Then there are Swiss teams with leaders playing off.

Advice please.

We have a popular format that's widely used by counties for their Championship Pairs when they consist of a qualifying round followed by a 7-table Howell for the top 14 pairs. It's described in the White Book:

Quote

Section 172 EBU Carry-forward Score Formula
Contestants who qualify for the next stage of a competition may be awarded a carryforward
score in respect of their qualifying score, provided that all such contestants
have been ranked as a single field. This is unusual in EBU events.
The formula is:
......S x FT
C = ----------
......2 x QT
where
C = the carry-forward score in MPs to be awarded to the contestant
S = the qualifying score in MPs obtained by the contestant
FT = MP top on a board in the final
QT = MP top on a board in the qualifying stage
MP = matchpoints
Note The effect of this formula is such that if the two sessions are of equal
length, then the final carries twice as much weight as the qualifier. This
ratio varies as the respective lengths of the two stages vary.
Fractions are resolved in the competitors' favour to the minimum unit of scoring in the
final.

[shevek]

Thanks for that.

[gnasher]

Quote

The effect of this formula is such that if the two sessions are of equal length, then the final carries twice as much weight as the qualifier.

To me that sounds like too much.

The ACBL's method is less generous than the EBU's, and also more complex:

ACBL CoC said:

3. A carryover will be calculated based on scores in the qualifying session(s). The maximum spread
between highest and lowest carryover will be equal to the number of sessions in the events times top in
the final session(s). For six session events with two cuts, the maximum spread for the middle two
rounds will be only two and one half times top in the semi-final sessions.

4. Carryovers will be based on the following formula:
C = (M - m) [ (Q/E)(AxBxQ)/S)] where
C = carryover
B = number of boards played in qualifying session(s)
S = sum of the scores of all qualifiers
M = matchpoints of a given pair
m = matchpoints of lowest qualifying pair
E = pairs entered in the event
Q = pairs to be qualified
A = average on each board in the final session(s)

If the formula determines the high carryover to be above the allowable limits then the formula is
abandoned and the following procedure is followed. Subtract the low qualifying score from the
high qualifying score and divide this number into the maximum allowable carryover. The resulting
factor is multiplied by the difference of a score and the low qualifying score. Thus the low qualifier
will have a carryover of zero and the high qualifier will have the maximum allowable carryover.

In WBF events there is no carryover. I've never heard anyone argue that this is sensible.

[shevek]

gnasher, on 2012-April-30, 01:44, said:

To me that sounds like too much.

The ACBL's method is less generous than the EBU's, and also more complex:


In WBF events there is no carryover. I've never heard anyone argue that this is sensible.

Yes the ACBL seems too complicated for a weekend congress & the EBU guide too generous. I've done some googling and seen european events with 1/3 c/f. Seems closer to the mark.

[jeffford76]

gnasher, on 2012-April-30, 01:44, said:

In WBF events there is no carryover. I've never heard anyone argue that this is sensible.

Isn't this so that pairs can drop into the later stages? If there were carryover it's not at all obvious what score they should start with.