Maybe, following on from your suggestion ,I beleive this should work, say...

. Bet the first 4 horses going down the list that have not been placed at any of its last 3 runs, include x as a run so as to keep things simple.

.Must have at least 2+ career starts.

.10 runners exactly.


My original post was to just bet the 2 outside barriers that are $4.50-99.00 in the pre-post market.
10 runners exactly.
Regardless of starts or form.

Cheers

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Cheers.