Rounding or double rounding? 4BBB

[Woodenteesonly]

Hi all,

I’ve searched throughout R&A handicap book and online and couldn’t find an answer to this, and other posts on this topic from last year didn’t seem definitive either..

In 4BBB you apply the 90% handicap allowance to the difference in course handicap between biggest and smallest, but is this course handicap a rounded number, or unrounded.

I will put an example below..

Based on course rating 70.2
Par 69
Slope 120

For ease, players A B and C have a handicap index of 10.0
Player D handicap index is 16.0



Example 1- Rounding just once

Players A, B & C have an unrounded course handicap of 11.8194

Player D has an unrounded course handicap of 18.1912

The difference between the two is 6.38, we then apply 90% and you have 5.7, which rounds up to 6 shots for Player D.




Example 2 - double rounding

Players A B & C course handicaps round up to 12

Player D’s course rounds down to 18.

The difference of 6 when you apply 90% is 5.4, which rounds down to 5 shots for Player D





Example 3 - double rounding again but only at the end

Players A, B & C have an unrounded course handicap of 11.8194

Player D has an unrounded course handicap of 18.1912

The difference between the two is 6.38, this rounds down 6.0. We then apply 90% and you have 5.4, which rounds which rounds down to 5 shots for Player D. Same result as example 2 here, but won’t be the case every time.




Can you advise which is correct?

Thanks in advance

 

[D-S]

Example 2 is correct, you take the rounded CH of each player then the shot allowance is 90% of the difference - the difference is rounded up or down (in your example 5.4 rounded down to 5).

 

[Woodenteesonly]

Example 2 is correct, you take the rounded CH of each player then the shot allowance is 90% of the difference - the difference is rounded up or down (in your example 5.4 rounded down to 5).

Thank you,

But I thought WHS was trying to get away from double rounding?

Why would they round twice when you can use the exact number and get a more accurate difference between the two?

 

[Oldbutwise]

Hi all,

I’ve searched throughout R&A handicap book and online and couldn’t find an answer to this, and other posts on this topic from last year didn’t seem definitive either..

In 4BBB you apply the 90% handicap allowance to the difference in course handicap between biggest and smallest, but is this course handicap a rounded number, or unrounded.

I will put an example below..

Based on course rating 70.2
Par 69
Slope 120

For ease, players A B and C have a handicap index of 10.0
Player D handicap index is 16.0



Example 1- Rounding just once

Players A, B & C have an unrounded course handicap of 11.8194

Player D has an unrounded course handicap of 18.1912

The difference between the two is 6.38, we then apply 90% and you have 5.7, which rounds up to 6 shots for Player D.




Example 2 - double rounding

Players A B & C course handicaps round up to 12

Player D’s course rounds down to 18.

The difference of 6 when you apply 90% is 5.4, which rounds down to 5 shots for Player D





Example 3 - double rounding again but only at the end

Players A, B & C have an unrounded course handicap of 11.8194

Player D has an unrounded course handicap of 18.1912

The difference between the two is 6.38, this rounds down 6.0. We then apply 90% and you have 5.4, which rounds which rounds down to 5 shots for Player D. Same result as example 2 here, but won’t be the case every time.




Can you advise which is correct?

Thanks in advance

This is the definitive guidance document on these matters: WHS Guidance Document
Page 47 onwards for worked examples.

 

[Colin L]

Thank you,

But I thought WHS was trying to get away from double rounding?

Why would they round twice when you can use the exact number and get a more accurate difference between the two?

At the start, the exact numbers were used, but this was later changed to what we have now which is easier for players.

 

[rulie]

Differentials are only calculated to one decimal place. Using anything more than one decimal place in calculations after that is silly. Machines do not improve the precision.

 

[Voyager EMH]

At the start, the exact numbers were used, but this was later changed to what we have now which is easier for players.

It would be even easier without CR-Par for 4BBB matchplay.

No need for CR-Par in any matchplay format really.

 

[rosecott]

Hi all,

I’ve searched throughout R&A handicap book and online and couldn’t find an answer to this, and other posts on this topic from last year didn’t seem definitive either..

In 4BBB you apply the 90% handicap allowance to the difference in course handicap between biggest and smallest, but is this course handicap a rounded number, or unrounded.

I will put an example below..

Based on course rating 70.2
Par 69
Slope 120

For ease, players A B and C have a handicap index of 10.0
Player D handicap index is 16.0



Example 1- Rounding just once

Players A, B & C have an unrounded course handicap of 11.8194

Player D has an unrounded course handicap of 18.1912

The difference between the two is 6.38, we then apply 90% and you have 5.7, which rounds up to 6 shots for Player D.




Example 2 - double rounding

Players A B & C course handicaps round up to 12

Player D’s course rounds down to 18.

The difference of 6 when you apply 90% is 5.4, which rounds down to 5 shots for Player D





Example 3 - double rounding again but only at the end

Players A, B & C have an unrounded course handicap of 11.8194

Player D has an unrounded course handicap of 18.1912

The difference between the two is 6.38, this rounds down 6.0. We then apply 90% and you have 5.4, which rounds which rounds down to 5 shots for Player D. Same result as example 2 here, but won’t be the case every time.




Can you advise which is correct?

Thanks in advance

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