I've always wondered how many lengths are saved by a horse travelling on the fence compared with a horse one out .....

I can picture the can of worms unravelling right now in front of my eyes, but there must be a rule of thumb that gives the unwashed (me) half a clue ..... or do I need to go and get my Trig book out ??

Shocking's win in the Melb Cup, had it run no more than one out all the way probs would have won by 10 lengths ???