A 'Roving Banker' trifecta is where you pick out one horse which must finish either 1st, 2nd or 3rd and then any 2 of your other selections must fill the other two placings. So, if you can find a horse that you're pretty sure will run a place, it's not a bad idea.

Yeah, your idea is okay but maybe not the whole $100. Perhaps $50 or something like that. Another alternative would be to choose one 'best bet' each week for $50 and lift the total amount bet each week from $100 to $150 or something like that. I'll have a bit more of a think about it.