Green-screening & liability question....

I think you must really know the answer to all your questions and are perhaps just trying to broadcast your " coup" ?
Nothing wrong with that in essence.
Btw if you ever try to make any wager on BF and you come up short in their " net" liability calculations ( which are done virtually instantaneously by the BF computers) it will not let you proceed.
But you probably know that as well don't you ?

Not at all. Apologies if it seemed like I was bragging - that's genuinely not my intention. I have no idea if I have the option open to me to lay this bet, and still don't after your reply.

I do not have the liability required to cover the amount I'd want to lay on it's own. But seeing as I'd be green-screening, I'm not sure if betfair would require the funds to be there anyway?

Maybe I'm not making sense, and presumably you get lots of braggers on here?

I don't want to go through with trying it, because I might choose not to trade this one off and just hope my selection wins. I was therefore hoping someone on here could help and let mek now if I have the option or not.

The answer is yes.
And imo you would be extremely ill advised not to trade out of your original bet after such a huge movement in odds in your favour.
But I know nothing of the Xfactor game/show, and would leave others to better advise you perhaps on that particular angle.
But in general gambling terms you are certainly sitting pretty and it would be a pity to blow it all imo.
I don't know your original bet size, but perhaps just trade a certain portion of it ?

Thanks FaFH

That's very good to know I've got the option. I only staked £20 overall (couple have fallen by the wayside), so I don't really stand to lose much. I know the smart thing to do is to take it and run, but could be kicking myself on Sunday night if my selection wins. I could take £230 now then, or leave it and hope to get £910.

I did place the bet assuming odds would tumble so I guess I should stick to my original intention. Thanks for the reply.

To clarify FAFH's already correct answer:

If you lay off on the same line on the same market the maths is simple, it means it comes out of your winnings and betfair can calculate this so unless something is wierd you don't need more money.

BUT: If you "lay off" by e.g. backing remaining rivals to try and achieve the same monetary result, I'm fairly sure you'd need more money.

Can someone clarify that please?

No. I feel I've said enough

Backing both would need more money temporarily since betfair doesn't know that they will both get matched, you might only get one of the bets matched and therefore would increase your liability on the back that didn't get matched.

If you put 20 on at 150 and it's now at 3, then your current board looks like:

2980
-20
-20


If you lay 1000@3 then your board will look like

980
980
980

No?


Oh, you're not talking decimals. In that case:


Your current board is
3000
-20
-20

And you'd need to lay 755@4 to make it

735
735
735