The best is the bet to price.
e.g.
Divide horses price into a take out figure.
There can be 1-5 horses , it does not matter .

You also have a greater chance to recover more quickly because it does not over load the shorties like betting to odds does (Liability)

example
Price $3.00 in to take out fig say $12.00 = 4.00 O/L

Betting to liability also known as betting to odds, it is more expensive to use especially on odds on horses.

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Cheers.