Hi Greystoke.

If one could sustain a 100% SR of separating the 2 Favs , then yes , it would be 50% SR.

But we do know that is very unlikely long term.

We are assuming based on past history over 10 yrs that the top 2 Favs win 50% of all races.

Now separate them so you have one selection per race.

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There is one strong method I can recommend having a go with .

RULES
Target the 2 Favs in each race.

Bet 4 units on the one you feel should win.
Bet 1 unit on the other, as a sort of saver bet.

This works very well & you will enjoy a 50% SR.
Hopefully the long runs of outs will be contained doing it this way & keep ones punting more interesting.

Delete any race with a fav <=2.00

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Cheers.