When I was running the GTX data base , I found one can get too bogged down with the finer points to a level where one ends up with 5 bets a month.

Thus needing a bunch of systems so one does not die of boredom.

I found generally , beaten lengths had less advantage than Last start placing.

The lengths came into its own when working out how many lengths a horse won by.

Hoses winning by 5+ lengths did show some advantage

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Cheers.