The answer to your question

If chasing for the place ,it`s best to keep one`s bets to races with
8-12 runners only.
Test run over 10,000 races
Plc SR 60%
-4% LOT
longest run of outs =8

In races with 8-20
Plc SR 56%
-9% LOT
longest run of outs =9

Cheers

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Cheers.