Betfair Win Win
 

Recently I read a system (could have been on YouTube) where you can get set on a lay bet and then wait for the back bet to be higher so you are in a win win situation. So you end up backing and laying the same horse and winning or getting square regardless of the result. Would be interested in 'talking' to anyone who may have explored this idea. I am interested in examples and the actual mathematics of how this might work.