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UKJamie
27th February 2010, 10:19 PM
Hi all

I've been a bit quiet while I have been juggling figues and trying to find my niche. I think I have found one, its a bit high risk in regards to liability, but choosing the matches carefully and getting the right odds I think it may work.
Anyway I am trying to work out some formulas for a speadsheet and for the life of me I cant figure the way to do it, so maybe one of you lot with more experience than me can shed some light.

What I propose to do is to find a match where there is a big favourite say like Liverpool v Blackburn this Sunday.
I can LTD at odds of 5.3 for £300 giving me a liability of £1290
Back 1-1 @ 10.5 for £151.43
Back 2-2 @ 30 for £53
Back 3-3 @ 120 for 13.35

Basically so long as its not 0-0 its almost certain to be a winner with £82 green across anything else up to 3-3

Of course 4-4, 5-5, 6-6 etc would also lose the bet, but in this game I feel there will goals but with Liverpool so strong against Blackburn the chance of 4-4 is unlikely, and everything is covered from 1-0 through to 3-3

I have a spreadsheet and the colums are odds, stake, return, profit, but I have to keep entering various amounts in the stake column to get the green across the board.
What I want to do is to use the £300 lay liability amount as the set figure, and when I put the odds into the columns the stakes are automatically calculated for the three draws (1-1, 2-2 and 3-3).

So from my above example I would have entered the lay odds of 5.3 and the stake of £300
then I just want to enter the back odds for 1-1, 2-2 and 3-3 and have the spreadsheet calculate the stake amount for them to give an equal return across the board (151.43, 53 and 120).

Does anyone with excel experience have a formula to do this please, or at least provide the maths to do the calculations.
I can them induvidually, and currently I enter the odds and the stake and my formulas calculate the return and the profit for each result. What I cant figure out is how to do them from just entering the odds and base the calculations on the lay liability.

Also I expect you will pick the bones out of the stategy, and its high risk based on the ROI but I am only paper trading and want to test it and if possible refine it, however pick away.
My last post had excellent replies and I learned a lot from them, so am looking forward to reading some more from the wiser ones that live here :)

Those of you that contributed to my last post will know I am living in Turkey and unable to have a Betfair account here, but the good news is I am returning sometime soon, possibly March and will be able to open one then, and I am experimenting and working out what stategy I will use when I can do so.

Cheers
Jamie

1/4 of a millionaire fund
27th February 2010, 11:29 PM
Just treat everything in terms of book %'s so 5.3 is probability of 100/5.3 = 18.867%, 10.5 is 100/10.5 = 9.52% to calculate your stake needed to equalise we just divide one by the other and multiply by your stake

9.52/18.867 * £300 = £151.42 and so on. For the spreadsheet there's no need to work the book %'s out but it's a good idea to understand the mathematics behind things.


OK lets assume your draw odds is in A1 and stake in B1, A2 has odds for 1-1, A3 odds for 2-2, A4 odds for 3-3

to calculate stakes for 1-1 B2 just needs =A1/A2*B1
to calculate stakes for 2-2 B3 just needs =A1/A3*B1
to calculate stakes for 3-3 B4 just needs =A1/A4*B1


Effectively you're just laying 0-0 and negligable parts of Any Unquoted, it'd be worth you checking you're getting better odds than a straight lay of 0-0 before going ahead as the comms you'd pay on a £1400 win on say 1-1 may make this a very poor bet.

UKJamie
27th February 2010, 11:36 PM
Excellent post MF, thanks for your clear instructions and the maths. Exactly what I asked for :)

1/4 of a millionaire fund
27th February 2010, 11:56 PM
Excellent post MF, thanks for your clear instructions and the maths. Exactly what I asked for :)

No problem, might be worth you amending the stakes calculation to include comms to even those backs on 1-1,2-2 etc you'd just need to amend the formula to B2*(A2-1)*1.05 etc (assumong your comm rate is 5%.

One of the problems with cross markets is the effect of comms and the more selections you back the more likely you'll be crossing the spread and reducing your overall odds. I'd be suprised if the effective odds you'd get, once comms/crossing the spread etc are taken into account, are much, if at all, better than laying 0-0. If you look look at the example you gave ( and that doesn't take comms into account) you're risking 1511 ( if 0-0 came in) for a return of £82 effectively over 18's we can lay 0-0 at 16.5