Another approach after a loss is to multiply the total loss by .85 + ones initial stake to all races .

Target selections 6.60 & less.

Example
Initial bet on all races 10.00
10.00 L @ 6.60 = -56.00
56.00 x .85 = 47.60
47.60 + 10.00 = O/L 57.60

Restart at the first success.

Do this for a max of 4 outs max.
Then restart.

Have 2 banks of 500.00 / betting 1.00 initial bet.

It can get expensive, so make sure the bank can handle it based on the max div one is prepared to indulge.

__________________
Cheers.