Heres another angle.

Target the first 3 horses one comes to starting at the 3rd line of favortism in the pre post market.

Bet all 3 horses.

There could be 2-5 horses making up the 1st & 2nd fav line of betting.
We ignore all theses.

Start at the 3rd line of betting for our 3 horses.

Some good payers can be struck with this idea.

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Cheers.