In order to play according to Thomas Donald system you should have bankroll 3 thousand times more than your own initial bet. Each time when you lose your bet, you have to increase your previous bet a little bit and in the case of the winning you should, on the contrary, decrease your bet.

This system is based on the Thomas Donald’s idea that in the course of the next day, week, month and a year the total number of winnings and losses is equal. And the author of this strategy promises that his system will work under following circumstances:

Don’t play if you don’t have enough time within chosen term or if you don’t have enough money within that sum that exceeds the initial bet 3000 times.

Let’s check this system in practice. For example, we always bet on a red and our initial bet is $1. Suppose, that a red and a black have dropped 18 times out of 37 spins each, and zero has dropped only once. Let the red and black alternate in such a way: 5 times – red, 5 times – black, 4 times – red, 4 times – black, 3 times – red, 3 times - black and so on.

Let’s pay attention to the fact that as a result we have made a draw, although we have winnings one time more, than losses. In addition, sequence of red and black was quite unfavorable for us, as we have won only per $1 from each spin. If the sequence had begun with five blacks, then we would have won $20 (6+5+4+3+2) instead of $5.

And remember the last thing: according to the Thomas Donald system if zero drops out the next bet must be increased. And unfortunately zero breaks beautiful quality of invariance that’s why it’s difficult to suppose your next step with certainty.