i have a system...
you put £10 on red... if you lose, you put £21 on red...then if you lose, you put £41 on red...
and so on until you win.
its foolproof, except for that 'green' button under the table.
This is foolproof as long as long as you can keep doubling your bet, and there is no max limit.
When partypoker first launched this could be done with £1 bets, doubling and doubling as required, and you could play even/odd red/black at the same time, as long as you kept track.
They have since introduced maximums of £500 or similar, and frankly you will get burnt by this now, badly burnt.
Once had 10 reds in a row when I was playing a black.
1,2,4,8,16,32,64,128, 256, 512 it was scary bikkies on that last roll seeing the black come up, so I worked out an overall profit of £1.
Runs like that are very very possible, the random number generators they utilise are aparently indepentently tested every so often.
Not worth it now with the minimum of 5 and max of 500 being far too close together to generate an income.