Heres a plan that has pulled some reasonable payers with no real long runs of outs, which is the biggest killer of all trifecta systems.

1)Target races with 7-9 runners only.

2)Get six horses by selecting the 6 with the best average prize money as shown in the Sportsman or Wizard form guides.

3)Outlay- now this is the important bit.
Dont box them (cost $120).
We bet 2 horses to run either 2nd or 3rd with 4 others .Cost $80

We need one or both of the anchor sels. to run a place(2nd or 3rd.) with one or two of the other 4 to run a place in any order.
2 anchor sels. with 4 others=2*4*5=40*2=$80 outlay.

What we have done is reduced the cost of a std. box 6 trifecta by 33% without compromising the spread of exposure by very much.
Remember we dont require both anchor sels. to get up for us , just one to run 2nd or 3rd (not 1st).

The 2 horses with the best average prize money can be the anchor bets

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Cheers.