Hi Dingo,
The idea is to take the selection with the worst wt rating out of your tipsters top 2 selections e.g. 90pts over 100pts as per say UniTAB wt ratings

For example , there was a $9.20 winner at Terang race 3. Mon 29th
It had the worst rating out of the top 2 tipster selections.

A more concervative staking approach is ...
1 1 2 2 3 3 4 4 = 20 units

Cheers.

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Cheers.