by GaryRussell » Mon Apr 12, 2010 4:43 pm
In your example you will not need any funds in your account to place the back bet. The exposure on that selection will be zero after the back bet is placed.
You should be aware that there is however a rare internal rounding error which happens at Betfair's end which can leave you with a balance of -$0.01. If this happens it will not accept the back bet even though it is reducing your exposure. It's always a good idea to make sure you aim to leave $0.01 in your account. So if your balance is $200.00 for example then don't lay more than $199.99 liability.