It's a good guide to how the horse is going in it's preparation or race fitness.
If the trainer scratches the horse from an Open at Morphettville and lets it run in the Listed race, it's a pretty good guide that the trainer thinks the horse is up to it.
It's a useful guide, nothing more.

http://www.racingandsports.com.au/r...ings.asp?type=3

And there have been some big priced winners come out of it.

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