Here is a selection idea I saw somewhere.

RULES
Target all horses with x3 in its two recent form figures.

.Bet .5% of bank to win
.Adjust bank up or down accordingly at the beginning of each new day.

This allows for 200 outs.

.Must be 3.50+

If more than one, bet them all.

It has produced some big paying winners.

Maybe someone has some stats for this in their data base.

Cheers.

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Cheers.