Most staking plans for place betting for any extendered period , are fraught with danger because the dives can be very low.

The safest is a plan called Crushing, which works on the basis of increasing our bet only after a placegetter gets up for us.
1,1,1,1,1P,2,2P,3P,4P ect.
Once a profit is made ,start at the beginning again.

If you can pick them ,you should do very well with this plan.

Cheers.

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Cheers.