Top rated and outright fav in the race. It could work also by looking at the case where the top rater is in the top two or three actual fav for the race. I haven't tested that though. It has increased the favs hit rate from around 30% to 40% in effect. The ratings are dirt cheap and I bought them originally just so that i had something to research in my spare time.
I'm working on seeing how a set of free ratings go but I can't get back records for those so it's a live test with small bets.

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Dear Lord
Please let me break even. I need the money.