Hi,
I do I say only bet on the 1 and 2 fav if the gap between the 2nd fav and the 3rd fav is 2 or more.
example 1st fav 2 and second fav is 5 odds and 3 fav is 7 odds. As the gap between the 2nd fav and 3 fav is 2 then I will place a bet on the 1st and 2nd fav.