Carry Forward -0.50c

GWS vs Port Adelaide 2.10pm
Lay at $12.50 Back at $10.00
Lay at $1.08 Back at $1.11 WON +.30c

Adelaide vs Melbourne 4.40pm
Lay at $1.10 Back at $1.09
Lay at $10.50 Back at $11.50 WON +$10 Get in!

Brisbane vs Sydney 7.40pm
Brisbane Lay at $4.50 Back at $6.00
Sydney Lay at $1.25 Back at $1.19 WON -$0.60c

Essendon vs Bulldogs 7.40pm
Essendon Lay at $1.34 Back at $1.32 WON -$0.20c
Bulldogs Lay at $3.75 Back at $4.00

Overall +$9.00 profit for $10 example stakes.

Overall +$9.00 profit for $10 example stakes.
Forgot to add that the maximum liability to get that $9.00 profit was $25.00.

Gold Coast vs Western Bulldogs 3:20pm
Gold Coast Lay at $1.28
Western Bulldogs Lay at $4.80

Carlton vs Adelaide 4.40pm
Carlton Lay at $2.36
Adelaide Lay at $1.74

Being fairly ignorant about sports betting I have a question about draws - doesn't a draw result in all back & lay bets losing? so in these examples would mean a $40 loss?

On reflection I assume the lay bet must win, or else there is no way this method could be used on soccer.

Nice examples, every market is greater than 100%. Lay to payout the same for as much as the market can stand. No need to do anything else.

Back bets would lose, but lays would get the lot.

In markets where there is a draw selection offered, you do the same procedure as above on that selection as well.
If a draw occurs on a sporting event where there is no Draw selection
offered, then...

Dead heats

Unless stated otherwise in the Specific Sports Rules the Dead Heat Rule applies to bets on a market where there are more winners than expected.
Dead heat is a term that describes when two or more selections in an event tie. If a “dead-heat” between two selections is declared on any event, half the stake is applied to the selection at full odds and the other half is lost. If more than two “dead-heats” are declared, the stake is proportioned accordingly.

CP, I understand what you are doing but laying both at less than 100% and backing both at more than 100% can't be a good strategy, can it?

Take that back as I've just run the numbers on a hypothetical.
Lay 1.28 Back 1.20 Loses .80
Lay 4.80 Back 5.60 Wins 8.00
The equivalent of 10.00 on a 5.60 chance.

ps, still running the UK thing that you showed me?

Here's something for those that get banned, you'll need a massive bank, but won't get banned. They'll think you're a complete mug.

I found some Euro bookies that offer odds up to 1501 and a few more that offer 5001 on Formula 1. Given Betfair's maximum is 1000, and you green up, it's risk free profit.

But is it practical to expose that much capital?

No liquidity dropped and that was the problem we were facing and why you started to get different outcomes. Switched to sports, a lot more manual work and time involved, but money always there.

As for the above example: if you risk say $8.00 to win $80, that's odds of $11.00 not $5.60. and there's your edge.