Help with betfair calculation.....please

[jay78]

Hi I have been trying to work out a calculation for ages but just cannot work it out, all you mathmaticians please help me. example Chelsea v Fulham It has reached half time so i closed my bet for a loss of 25 quid, Chelsea, Fulham and Draw all red for 25. Now i want the liabilty to all be with chelsea and fulham and want the draw to be at zero. What will the liabilty rise to on Chelsea and fulham once i have done this. Bit vague, but feel free to ask if i havnt given enough info

[sbi]

Re: Help with betfair calculation.....please hi jay78. if i understand correctly you need to stake sufficient for the draw such that if the draw comes up you will break even. you are happy to take this position at the cost of increased liability on chelsea and fulham. so, you need to work out the stake you need to put on the draw to give £25 profit. profit = (odds - 1)*stake. stake = profit / (odds - 1) let's say the draw is now @ 2.3 so, stake = 25 / (2.3 - 1) = 25 / 1.3 = 19.23 stake £19.23 on the draw, your loss if chelsea or fulham win will be 25 + 19.23 = 44.23 and you'll break even if it's a draw. :ok