Actual Starting Price (actBSP)

[EKK]

Hi,

I have noticed something strange in StartingPrices - when the actual SP price is known.

I see some inconsistencies between the content of the backStake array, layLiabilities array and the actualSP price.

For example - the information available is:

ActualSP = 2.2248047768982993
BackStakeTaken = 1962.83
LayLiabilityTaken = 3571.03

If I use the taken stakes and liabilities to recalculate the ActualSP - I get the following:
ActualSP = LayLiabilityTaken/BackStakeTaken + 1
so ActualSP = 2.819327196

which is different.

Can someone explain?

Thanks

[BetfairDeveloperProgram]

Hi EKK,

The stake amounts shown are SP bets only But the actual SP calculation includes exchange bets.

The concept of calculating the SP price works as follows and

The price of that horse in the exchange market at the off was perhaps 2.18 – 2.2.

If we didn’t consider exchange prices when calculating the BSP, and only used SP bets then we’d return a BSP of 2.819327196. That’s what we call the “Far Price”. But that would be unfair. We’d be matching SP layers (and backers) at 2.82 while leaving exchange backers at 2.2 unmatched.

So we add in unmatched exchange back bets to return a fairer price. We call that price including unmatched exchange bets the “Near Price”.

You can find further detailed examples via https://promo.betfair.com/betfairsp/...dWorkings.html

Kind Regards

Neil