for your info

[mak]

It is from Betfair
just in case that you haven't notice or you are interested


Betfair Customer Services 08 Jan 14:13
In a recent race at Wetherby only one horse competed the course, meaning that there was only one “winner” (i.e. one horse placed) in the relevant “to be placed” market. In cases where there are fewer winners in a place market than the number assumed by the terms of the market, there exists the possibility for a customer backing all selections to end up with an exposure on the market which is greater than the customer’s account balance.

Therefore, from the week commencing Monday 11 January all National Hunt “to be placed” markets will be loaded using an exposure algorithm which assumes that all back bets could be losing bets. This means that a customer’s available to bet balance will be reduced by each such back bet placed, with no exposure offset given for other back bets placed on the market. This is the same exposure algorithm that is applied to (for example) a ‘Next Manager’ market, where the winner may not be listed in the market when the market is initially loaded.

The analysis we have undertaken leads us to believe that this will only have an impact on the very small number of customers who have backed all or most of the selections in a place market, but we will keep this under review.

Betfair Horseracing

http://site.forum.betfair.com/jive3/bet ... ageCount=1