These days I saw a TV series where they used this technique to always win by betting on black!
1st bet: 100 black - lose
2nd bet: 200 black - lose
3rd bet: 400 black - lose
4th bet: 800 black - lose
5th bet: 1600 black - win 3200
6th bet: 3200 black - lose!
7th bet: 6400 black - win 12800
8th bet: 12800 black - win 25600
Of course, you need a large bankroll for this feat.
1st bet: 100 black - lose
2nd bet: 200 black - lose
3rd bet: 400 black - lose
4th bet: 800 black - lose
5th bet: 1600 black - win 3200
6th bet: 3200 black - lose!
7th bet: 6400 black - win 12800
8th bet: 12800 black - win 25600
Of course, you need a large bankroll for this feat.


















