EW calculations

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Goobs
Posts: 77
Joined: Thu Jul 10, 2025 4:01 pm

When you have an odds-on favourite, this can tend to skew the rest of the book, early on. I have seen you can back EW bets on a bookie, then lay off the liability on Betfair.

I just want to make sure I'm mathing it correctly. Is my thinking correct?... you want to lay off on the win market and basically create a net position that just exposes you to the place market part of the bet, as that is where the misspricing is?

If I have an EW bet for £2 @26 (2x£1) with a return of £33.25, how much do I want to lay off on the exchange, £1 for a liability of £31?
guy333
Posts: 65
Joined: Sun Aug 16, 2015 9:47 am

It depends what lay odds you can get on the exchange.

I think you end up making a small loss on the win bet but make a profit on the EW side.
Goobs
Posts: 77
Joined: Thu Jul 10, 2025 4:01 pm

Yes, as you can imagine, the odds on the lay side early on for the long shots are like 1000, I've placed resting orders at the odds needed to cancel out the win side should it get hit in-play, might reduce my variance.

Some of the odds were juicy this morning, I got an EW bet on Huntagrove @151 for the 15:05 Galway, same bet on the exchange is about odds of 42 now.
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jamesedwards
Posts: 4690
Joined: Wed Nov 21, 2018 6:16 pm

Be careful of a couple of things;

> Bookmakers won't like you taking value EW bets and you risk getting your account strictly limited.
> Bookmakers will reduce the number of places paid out on EW bets based on the final number of runners, whereas Betfair Exchange will remain the same no matter how many non-runners there are. eg if there is originally 8 runners but only 7 end up running then the bookmaker will be paying on 2 places whereas your liability on Betfair will still be 3 places.
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