This is my 15 units progressive method for even chance.

You have 15 units - you can not loose more.

Split (in your mind) your 15 units in one 5 units coin, one 4 units coin, one 3 units coin, one 2 units coin and one 1 unit coin.

Always start to play with the 3 units coin.

If you win you increase, so bet next with the 4 unit coin. Keep the 3 units won in your mind (or write it down).

If you loose decrease, so bet next time the two units coin.

Scratch the three units coin from your list. Its not longer available.

If you win after a loss, use the winnings from before.

Example:

your coins: 1-2-3-4-5 (15 units available)

bet with 3 units first

you loose

now you have

1-2---4-5 now you bet with two units

you win 2 units

you write down 1-2---4-5/2

you have won so you have to increase units, you should play three units, but you don't have "such a coin" so you have to bet 4 units

you win

you write down 1-2---4-5/6 (cause you have won 6 total now)

increase, so bet with 5 units coin

you loose

1-2---4/6

decrease, so bet with the 4 units coin

you loose

1-2/6

If you want you can now split the 6 won into two threes:

1-2-3/3 and bet the three units coin

and so on and so on

If you have a bad day, you can not loose more than 15 units.

If you have a good day, you units (and bankroll) will increase speedy.

I'm curious about your opinions.