Just by betting on the 'Hidden Even Chance' Bet in RouletteKeyGold .
I've made 115 bets.
I started with an opening balance £5 which has now grown to £16.15
Initially I made 18p bets until I'd doubled my opening balance to £10.00.
Then I moved on to 36p bets.
In each case I doubled up on a loss.
My largest losing run was 4 .
My lowest balance was 3.19
I believe this only goes to show how dangerous a common Martingale strategy can be!