My simple approach uses an elimination method first.

Then out of the remaining horses they must be a particular rating from R&S.

Flemington Quad

Race 1 - 2,3,13
Race 2 - 1,3,4,7,12
Race 3 - 1,3,7
Race 4 - 4,7,10

I sometimes when time permits like to throw in the selections from the tipsters in the tipping competition. Might be some hidden knowledge on a particular horse.