Here is a place staking approach that can work well on the right selections.

$100 Bank.
First bet 1 unit.

Bet increases to 2 units after a success & reduces by .50 unit after after a loss.
Example.
1.00 w
2.00 L
1.50 L
1.00 w
2.00 w
2.00 ect.

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Cheers.