I agree with Dale here.

I use to be able to run 8 different types of ratings at one time & the Pre-post market had the highest SR when using the top 5 selections as a base test , than any ratings available.

Targeting top 5 ,returned -5% LOT using UniTAB prices.

Not bad when considering 5 runners a race was bet.
Delete the correct runner & your now in profit.

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Cheers.