I feel you will find that the pre-post markets top 5 will have a higher SR than any ratings service.

Its Top 5 SR was approx 80%

Maiden races had appox the same percentage SR strangely enough.

Backing these top 5 produces a -5.5% LOT
Not bad for taking 5 runners at same amount on each.

Delete the correct horse & your now in profit.

I discovered this when I ran the GTX program which had 9 different ratings methods.

Then it comes down to what one does with these ratings.

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Cheers.